JP7067151B2 - Composite material of clad material and metal - Google Patents

Description

The present invention relates to a composite material of a clad material and a metal.

Conventionally, for example, a clad material in which dissimilar metals are bonded to Cu (copper) having good thermal conductivity and conductivity is known (see, for example, Patent Documents 1 and 2).

Patent Document 1 discloses a clad material composed of a core material made of stainless steel and a skin material made of Cu that has been rolled and diffusion-bonded on both surfaces of the core material in the thickness direction. Further, Patent Document 2 includes a first layer made of Cu or a Cu alloy, and a second layer and a third layer made of stainless steel rolled and diffusion-bonded on both surfaces of the first layer in the thickness direction. The clad material to be rolled is disclosed. In these clad materials, the end faces of stainless steel and Cu or Cu alloy are exposed to the outside in any case on the side surface extending in the thickness direction.

Japanese Unexamined Patent Publication No. 2005-134073 Japanese Patent No. 6237950

However, the clad material described in Patent Document 1 has a problem that the skin material made of Cu exposed to the outside corrodes not only on both surfaces in the thickness direction but also on the side surface extending in the thickness direction. Further, in the clad material described in Patent Document 2, the thickness direction of the first layer is formed by the second layer and the third layer made of stainless steel bonded to both surfaces in the thickness direction of the first layer made of Cu or a Cu alloy. While corrosion on both surfaces is suppressed, the first layer made of Cu or Cu alloy, which is an intermediate layer, is exposed to the outside on the side surface extending in the thickness direction, so that the first layer made of Cu or Cu alloy is exposed on the side surface. There is a problem that it corrodes.

The present invention has been made to solve the above-mentioned problems, and one object of the present invention is to use a clad material in which dissimilar metals are bonded to Cu or Al (aluminum), which is easily corroded. It is an object of the present invention to provide a material (composite material of a clad material and a metal) capable of suppressing corrosion of both surfaces in the thickness direction of the clad material and side surfaces extending in the thickness direction of the clad material.

The composite material of the clad material and the metal according to one aspect of the present invention is formed between the first layer and the second layer made of stainless steel, Ti or a Ti alloy, and the first layer and the second layer. From a clad material portion composed of a clad material having a thickness of 1 mm or less to which a third layer composed of Cu, Cu alloy, Al or Al alloy is bonded , and a member different from the clad material portion. It is configured and joined to a side surface extending in the thickness direction of the clad material portion, comprising a joint material portion made of the same kind of metal as the first layer and the second layer, and the joint material portion is bent and deformed. A joint portion to be joined to another member is formed on the outer peripheral surface of the bent portion including the bent portion .

The "Ti alloy" means an alloy mainly composed of Ti by containing 50% by mass or more of Ti (titanium). "Cu alloy" means an alloy mainly composed of Cu by containing 50% by mass or more of Cu (copper). "Al alloy" means an alloy mainly composed of Al by containing 50% by mass or more of Al (aluminum). Further, in the "joining material portion made of the same type of metal as the first layer and the second layer", when the first layer and the second layer are made of stainless steel, the joining material part is made of stainless steel. When the first layer and the second layer are composed of Ti or Ti alloy, it means that the bonding material portion is composed of Ti or Ti alloy.

In the composite material of the clad material and the metal according to one aspect of the present invention, as described above, the first layer and the second layer composed of stainless steel, Ti or Ti alloy, and the first layer and the second layer are used. The first layer and the second layer are arranged on the side surface extending in the thickness direction of the clad material portion made of the clad material to which the third layer made of Cu, Cu alloy, Al or Al alloy is bonded. Joining parts made of the same type of metal as the layer (stainless steel, Ti or Ti alloy) are joined. As a result, the first layer and the second layer made of stainless steel, Ti or Ti alloy having high corrosion resistance make the third layer made of Cu, Cu alloy, Al or Al alloy having low corrosion resistance. Not only both surfaces in the thickness direction are covered, but also the side surface of the clad material part is a joint material part composed of highly corrosion resistant stainless steel, Ti or Ti alloy (metal of the same type as the first layer and the second layer). By being joined to, the bonding material portion can cover the third layer as an intermediate layer on the side surface of the clad material portion. As a result, not only both surfaces of the clad material (clad material portion) in the thickness direction but also the side surfaces of the intermediate layer (third layer) having low corrosion resistance of the clad material (clad material portion) in the thickness direction are corroded. It is possible to provide a material (composite material of a clad material and a metal) that can be suppressed. Further, since the joint material portion includes the bent portion that has been bent and deformed, when the joint material portion is welded to another member, welding or the like can be performed on the bent portion that has been bent and deformed. For example, when the other member is a member extending in the thickness direction, the bent portion can be arranged along the other member, so that the joint member portion can be easily welded to the other member. be able to.

Further, in the composite material of the clad material and the metal according to one aspect of the present invention, the joint material portion is composed of the same kind of metal as the first layer and the second layer of the clad material. As a result, the clad material portion and the joint material portion can be made stronger and easier on the side surface of the clad material portion as compared with the case where the joint material portion is composed of the first layer and the second layer of the clad material and a different kind of metal. Can be joined to. As a result, it is possible to surely form a state in which the intermediate layer (third layer) is covered by the joining material portion on the side surface of the clad material portion.

Further, in the composite material of the clad material and the metal according to one aspect of the present invention, since the third layer is composed of Cu, Cu alloy, Al or Al alloy having good thermal conductivity and conductivity, the stainless steel of the clad material portion is formed. Provided a composite material having corrosion resistance in the first layer and the second layer composed of steel, Ti or Ti alloy and the bonding material portion, and having good thermal conductivity and conductivity in the third layer of the clad material portion. can do. As a result, the corrosion-resistant composite material can be suitably used as a heat sink that requires thermal conductivity or a conductive member that requires conductivity.

In the composite material of the clad material and the metal according to the above one aspect, preferably, the first layer, the second layer and the joint material portion are both made of stainless steel, and the third layer is made of Cu or a Cu alloy. Has been done. With this structure, the first layer, the second layer, and the joint material portion are all made of stainless steel, which is easier to weld and cheaper than the one made of Ti or Ti alloy. Since the material portion can suppress the corrosion of the third layer, it is possible to easily and inexpensively produce a composite material capable of suppressing the corrosion of the intermediate layer (third layer). Further, since the third layer is preferably composed of Cu or a Cu alloy, the thermal conductivity and conductivity in the clad material portion of the composite material are higher than those in which the third layer is composed of Al or Al alloy. Can be further improved. Thereby, the composite material having corrosion resistance can be more preferably used as a heat sink requiring thermal conductivity or a conductive member requiring conductivity.

In this case, preferably, the first layer, the second layer, and the joint material portion are all made of austenitic stainless steel. With this configuration, the first layer, the second layer, and the bonding material portion are made of austenitic stainless steel such as SUS316L, which is hard to have magnetism, instead of stainless steel having magnetism such as ferrite, and the first layer. By forming the three layers with non-magnetic Cu or Cu alloy, it is possible to suppress the magnetization of the composite material. As a result, it is possible to prevent problems caused by the magnetism of the composite material from occurring in peripheral electronic components or the like in which the composite material is used.

In the composite material of the clad material and the metal according to the above one aspect, the clad material portion has a strip shape or a quadrangular shape, and the joint material portion is a pair of side surfaces facing each other in a direction orthogonal to the thickness direction of the clad material portion. Can be joined along. With this configuration, the intermediate layer (third layer) of the clad material portion is formed on at least two side surfaces (a pair of opposite side surfaces) of the four side surfaces extending in the thickness direction of the strip-shaped or square clad material portion. Can be suppressed from corroding. As a result, corrosion of the intermediate layer (third layer) can be suppressed in a large region of the composite material. Further, for example, when the clad material is continuously produced by rolling, it is easy and efficient by transporting the strip-shaped clad material after rolling while joining the joint material portions to a pair of facing side surfaces extending in the longitudinal direction. Therefore, it is possible to obtain a composite material joined to a pair of opposite side surfaces in which the joint material portion extends in the longitudinal direction of the clad material portion. In the strip-shaped or square-shaped (rectangular shape including the square shape) clad material, the longitudinal direction may be, for example, the rolling direction of the clad material, and the lateral direction may be, for example, orthogonal to the rolling direction of the clad material. It may be in the width direction.

In the composite material of the clad material and the metal according to the above one aspect, the joining material portion is preferably joined along all the side surfaces parallel to the thickness direction of the clad material portion. With this configuration, it is possible to prevent the intermediate layer (third layer) from corroding on all sides.

In the composite material of the clad material and the metal according to the above one aspect, preferably, a connecting member provided so that the side surface of the clad material portion and the outside can be thermally and electrically connected is further provided. With this configuration, the clad material portion and the outside can be directly thermally or electrically connected by the connecting member without going through the bonding material portion, so that the Cu, Cu alloy, Al or Al alloy can be used. It is possible to suppress the decrease in thermal conductivity and conductivity of the composite material due to the joint material portion made of stainless steel, Ti or Ti alloy, which has relatively low thermal conductivity and conductivity as compared with each other. The connecting member is preferably made of a metal of the same type as the third layer made of Cu, Cu alloy, Al or Al alloy, and has substantially the same thermal conductivity and conductivity as the third layer. It becomes possible to have.

In the composite material of the clad material and the metal according to the above one aspect, preferably, the joint material portion is one side in the thickness direction of the clad material portion in the vicinity of the joint interface between the clad material portion and the joint material portion and the joint interface. It is formed so as not to protrude to one side from the surface of the clad material portion, and also to not protrude to the other side from the surface on the other side in the thickness direction of the clad material portion. With this configuration, the thickness of the joint material portion can be made equal to or less than the thickness of the clad material portion, and the surface of the joint material portion can be suppressed from protruding from the surface of the clad material portion. It is possible to suppress an increase in the thickness of the material.

In the composite material of the clad material and the metal according to the above one aspect, preferably, the length of the clad material portion is the length of the composite material in the direction orthogonal to the thickness direction in which the clad material portion and the joint material portion are present. It is more than 1/2. In other words, in a composite material of a clad material and a metal, preferably, with respect to the total length of the clad material portion and the length of the joint material portion in a direction orthogonal to the thickness direction in which the clad material portion and the joint material portion are present. The ratio of the length of the clad material portion is 50% or more. With this configuration, it is possible to sufficiently secure a clad material portion in which the third layer composed of Cu, Cu alloy, Al or Al alloy having good thermal conductivity and conductivity is located in the composite material. , It is possible to sufficiently exhibit thermal conductivity and conductivity in a composite material.

According to the present invention, as described above, in a clad material in which dissimilar metals are bonded to Cu or Al, which is easily corroded, both surfaces of the clad material in the thickness direction and side surfaces extending in the thickness direction of the clad material are corroded. It is possible to provide a material (composite material of a clad material and a metal) capable of suppressing the above.

It is a schematic disassembled perspective view of the portable device using the composite material of the clad material and the metal by 1st Embodiment of this invention. It is sectional drawing along the line 600-600 of FIG. It is a schematic diagram for demonstrating the manufacturing method of the composite material of a clad material and a metal by 1st Embodiment of this invention. It is a schematic perspective view for demonstrating the joining process among the manufacturing method of the composite material of a clad material and a metal by 1st Embodiment of this invention. It is a perspective view of the composite material of a clad material and a metal by 2nd Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line 610-610 or 620-620 of FIG. It is a schematic diagram for demonstrating the manufacturing method of the composite material of a clad material and a metal by 2nd Embodiment of this invention. It is a photograph which showed the observation result of the welding test performed in order to confirm the effect of this invention. It is sectional drawing of the composite material of the clad material and metal by the modification of 1st Embodiment.

Hereinafter, embodiments embodying the present invention will be described with reference to the drawings.

[First Embodiment]
First, with reference to FIG. 1, a schematic configuration of a portable device 100 including a composite material 4 (hereinafter referred to as composite material 4) of a clad material and a metal according to the first embodiment of the present invention will be described.

(Structure of mobile device)
As shown in FIG. 1, the portable device 100 according to the first embodiment is formed in a rectangular shape that is long in the X direction (longitudinal direction) and short in the Y direction (short direction) in a plan view from the Z direction. The portable device 100 includes an upper housing 1, a display 2 as a heat generating source, an electronic component 3 including a heat generating source such as a battery and a substrate, a composite material 4, and a lower housing 5. The upper housing 1, the display 2, the electronic component 3, the composite material 4, and the lower housing 5 are laminated in this order from the Z1 side to the Z2 side. The upper housing 1 has a frame shape having an opening on the Z2 side. The lower housing 5 has a box shape with an opening on the Z1 side. As a result, the lower housing 5 has a side surface portion extending in the Z direction. Further, the lower housing 5 houses the display 2, the electronic component 3, and the composite material 4 inside between the display 2, the electronic component 3, and the upper housing 1.

The display 2 is composed of a liquid crystal display, an organic EL display, or the like, and has a function of displaying an image on the surface (upper surface) on the Z1 side. Further, the upper housing 1 and the lower housing 5 are made of metal, glass, resin, or the like.

(Composition of composite material)
The composite material 4 has a predetermined shape and dimension required for the mobile device 100, and at least has a function of ensuring the mechanical strength of the mobile device 100 and heat generated from the display 2 and the electronic component 3 to the outside. It has the function of releasing. That is, the composite material 4 can have both a function as a chassis and a function as a heat sink. The composite material 4 is fixed to the inner side surface 5a on the Y1 side of the lower housing 5 by welding or the like.

As shown in FIG. 2, the thickness (length in the Z direction) t1 of the composite material 4 is 1 mm or less. As a result, it is possible to suppress (lower) the portable device 100 from becoming larger in the Z direction. In order to further reduce the height of the portable device 100, the thickness t1 of the composite material 4 is preferably 0.5 mm or less, more preferably 0.3 mm or less, and 0.2 mm or less. Is even more preferable. Further, in order to prevent the production of the composite material 4 from becoming difficult, the thickness t1 of the composite material 4 is preferably 0.03 mm or more, and more preferably 0.05 mm or more.

Here, in the first embodiment, the composite material 4 shown in FIGS. 1 and 2 has a clad material portion 41 composed of a clad material 6 having a three-layer structure and a clad material portion 41 in the longitudinal direction (X direction). The joining material portion 42 joined to the extending Y1 side side surface 41a and the joining material portion 43 joined to the Y2 side side surface 41b extending in the longitudinal direction (X direction) of the clad material portion 41 are included. That is, the joining material portion 42 and the joining material portion 43 are each along a pair of side surfaces (side surfaces 41a and side surface 41b) facing in the Y direction among the side surfaces orthogonal to the thickness direction (Z direction) of the clad material portion 41. It is joined.

In the first embodiment, the clad material portion 41 shown in FIGS. 1 and 2 is composed of a flat plate-shaped clad material 6 having a three-layer structure. Since the thickness of the flat plate-shaped portion of the clad material portion 41 and the thickness of the flat plate-shaped portion of the clad material 6 are substantially the same, the thickness of the clad material portion 41 (length in the Z direction) and the clad material are described below. The thickness of 6 (length in the Z direction) is expressed as t2.

In the composite material 4, as shown in FIG. 1, the clad material portion 41 and the joining material portion 42 can be joined by laser welding over substantially the entire X-direction of the side surface 41a of the clad material portion 41. As a result, the joint interface F1 between the clad material portion 41 and the joint material portion 42 and the vicinity of the joint interface F1 (joint portion B1) are formed so as to extend in the X direction along the side surface 41a of the clad material portion 41. .. Further, as shown in FIG. 2, the joint portion B1 between the clad material portion 41 and the joint material portion 42 is formed so as to extend in the thickness direction of the composite material 4. As a result, the first layer 61 and the second layer 62 of the clad material portion 41 and the joining material portion 42 are firmly joined.

Similarly, in the composite material 4, as shown in FIG. 1, the clad material portion 41 and the joining material portion 43 are joined by laser welding over substantially the entire X-direction of the side surface 41b of the clad material portion 41. Can be done. As a result, the joint interface F2 between the clad material portion 41 and the joint material portion 43 and the vicinity of the joint interface F2 (joint portion B2) are formed so as to extend in the X direction along the side surface 41b of the clad material portion 41. .. Further, as shown in FIG. 2, the joint portion B2 between the clad material portion 41 and the joint material portion 43 is formed so as to extend in the thickness direction of the composite material 4. As a result, the first layer 61 and the second layer 62 of the clad material portion 41 and the joining material portion 43 are firmly joined.

Further, in the direction orthogonal to the thickness direction of the composite material 4, in the Y direction (short direction), the length L2 of the clad material portion 41 is preferably ½ or more of the length L1 of the composite material 4. .. That is, in the Y direction, the total of the length L3 of the joint material portion 42 and the length L4 of the joint material portion 43 is preferably ½ or less of the length L1 of the composite material portion 4. In other words, the ratio of the length L2 of the clad material portion 41 to the total of the length L2 of the clad material portion 41, the length L3 of the joint material portion 42, and the length L4 of the joint material portion 43 is preferably 50. % Or more. That is, in the Y direction, the total ratio of the length L3 of the joint material portion 42 and the length L4 of the joint material portion 43 to the length L1 of the composite material is preferably 50% or less. The length L2 of the clad material portion 41 is more preferably 4/5 or more of the length L1 of the composite material 4. In other words, the ratio of the length L2 of the clad material portion 41 to the total of the length L2 of the clad material portion 41, the length L3 of the joint material portion 42, and the length L4 of the joint material portion 43 is 80% or more. Is more preferable.

The clad material 6 includes a first layer 61 on the Z1 side made of stainless steel, Ti or Ti alloy, a second layer 62 on the Z2 side made of stainless steel, Ti or Ti alloy, and a first layer 61. It has a three-layer structure in which a third layer 63 made of Cu, Cu alloy, Al or Al alloy, which is an intermediate layer arranged between the second layer 62 and the second layer 62, is joined by rolling. The first layer 61 and the second layer 62 are made of the same kind of metal. For example, if the first layer 61 is made of stainless steel, the second layer 62 is also made of stainless steel.

An overlay type can be used as the clad material 6. That is, in the clad material 6, the first layer 61 is diffusion-bonded to substantially the entire surface of the third layer 63 on the Z1 side, and the second layer 62 is formed on substantially the entire surface of the third layer 63 on the Z2 side. It may be diffusion-bonded. At the interface between the first layer 61 and the third layer 63 and the interface between the third layer 63 and the second layer 62, the constituent elements of each other are diffused into each other by diffusion annealing, thereby forming an interatomic bond. Can be formed. As a result, the first layer 61 and the third layer 63 are firmly bonded, and the third layer 63 and the second layer 62 are firmly bonded.

Further, the thickness (length in the Z direction) t2 of the clad material 6 may be substantially the same as the thickness t1 of the composite material 4.

The first layer 61 and the second layer 62 are made of stainless steel, Ti or Ti alloy as described above. When the first layer 61 and the second layer 62 are made of stainless steel, for example, the type of stainless steel can be selected as necessary from the viewpoint of good corrosion resistance. As the stainless steel, austenitic stainless steel, austenitic stainless steel-ferritic stainless steel, ferritic stainless steel, martensitic stainless steel and the like can be used. When the first layer 61 and the second layer 62 are made of stainless steel, it is preferably made of non-magnetic austenitic stainless steel, and SUS300 series (JIS standard) such as SUS316, SUS316L, SUS304 or SUS305. ) Is more preferably composed of austenitic stainless steel, of which SUS316L is even more preferable. SUS316L is an austenitic stainless steel containing 18% by mass of Cr, 12% by mass of Ni, 2.5% by mass of Mo, unavoidable impurities containing C, and the balance Fe (iron). It is an austenitic stainless steel with a reduced content, and can have sufficient non-magnetism even after being rolled.

Further, when the first layer 61 and the second layer 62 are configured by using, for example, Ti or Ti alloy, the type of Ti or Ti alloy may be selected as necessary from the viewpoint of good corrosion resistance. can. As Ti (pure titanium), according to JIS standards, 1 type with good molding processability, 2 types with a good balance between molding processability and mechanical strength, and 3 types and 4 types with high mechanical strength are available. It can be used. As Ti alloys, Ti-5% Al-2.5% Sn system with good weldability in mass%, 60 types and 61 types (JIS standard) with good balance between weldability and mechanical strength, and machines. It is possible to use 80 kinds (JIS) having high target strength and Ti-15% V-3% Cr-3% Sn-3% Al system (mass%). When the first layer 61 and the second layer 62 are made of Ti or a Ti alloy, two types of Ti having a good balance between molding processability and mechanical strength, or weldability and mechanical strength. It is more preferably composed of 60 or 61 Ti alloys having a good balance.

As described above, the third layer 63 is composed of Cu, Cu alloy, Al or Al alloy. When the third layer 63 is configured by using, for example, Cu or a Cu alloy, the type of Cu or Cu alloy can be selected as necessary from the viewpoint of good thermal conductivity. Cu (pure copper) includes C1000 series (JIS standard) having high thermal conductivity and conductivity, for example, oxygen-free copper (C1020), tough pitch copper (C1100), and phosphorus deoxidized copper (C1201, C1220, C1221). ) Etc. can be used. As the Cu alloy, according to JIS standards, C2000 series having good molding processability (spreadability), C3000 series having good corrosion resistance, C5000 series having good conductivity, and the like can be used. When the third layer 63 is made of Cu or a Cu alloy, it is more preferably made of Cu such as oxygen-free copper, phosphorus deoxidized copper, and tough pitch copper having high thermal conductivity and conductivity.

Further, when the third layer 63 is formed by using, for example, Al or an Al alloy, the thermal conductivity is good, and the specific gravity is smaller than that of the case where the third layer 63 is formed by using Cu or a Cu alloy. From the viewpoint of weight reduction, the type of Al or Al alloy can be selected as needed. As Al (pure aluminum), A1000 series (for example, A1050, JIS standard) having high thermal conductivity and conductivity can be used. As the Al alloy, it is possible to use an Al—Mn alloy such as A3003 (JIS standard), an Al—Mg alloy such as A5052 (JIS standard), an Al—Mg—Si alloy such as A6061 (JIS standard), and the like. Is. When the third layer 63 is made of Al or an Al alloy, it is preferably made of A1050, which has high thermal conductivity and conductivity and has relatively good molding processability among Al.

In the clad material 6, the Cu, Cu alloy, Al or Al alloy constituting the third layer 63 is generally more than the stainless steel, Ti or Ti alloy constituting the first layer 61 and the second layer 62. High thermal conductivity and conductivity.

Further, in order to enhance the thermal conductivity of the composite material 4 as a heat sink, in the clad material portion 41, the thickness t11 of the first layer 61 and the thickness t12 of the second layer 62 are both the thickness t13 of the third layer 63. Smaller than is preferable. In this case, the thickness t13 of the third layer 63 may be ½ or more of the thickness t2 of the clad material portion 41 (the same as the thickness t1 of the composite material 4 in the cross-sectional view shown in FIG. 2 of the portable device 100). More preferred. That is, it is more preferable to satisfy the relationship of thickness of t13 ≧ t2 / 2. On the other hand, in order to increase the mechanical strength of the composite material 4 as a chassis, in the clad material portion 41, the thickness t11 of the first layer 61 and the thickness t12 of the second layer 62 are both of the third layer 63. The thickness is preferably t13 or more. That is, it is preferable to satisfy the relationship of the thickness of t11 ≧ t13, and it is preferable to satisfy the relationship of the thickness of t12 ≧ t13. Further, for easy rolling, it is preferable that the thickness t11 of the first layer 61 and the thickness t12 of the second layer 62 are substantially equal to each other.

Both the joint material portion 42 and the joint material portion 43 are made of stainless steel, Ti or a Ti alloy, which are the same metals as the first layer 61 and the second layer 62. For example, the joining material portion 42 and the joining material portion 43 are both made of austenitic stainless steel, which is the same stainless steel as the first layer 61 and the second layer 62. From the viewpoint of the bondability (weldability, etc.) and physical properties (presence / absence of magnetism, etc.) between the first layer 61 and the second layer 62, the joint material portion 42, and the joint material portion 43, the first layer 61 and the second layer 62, the joint material portion 42 and the joint material portion 43 are both preferably made of the same stainless steel (stainless steel to which the same JIS symbol is attached in the JIS standard).

The side surface 42a on the Y2 side of the joint material portion 42 can be joined to the side surface 41a of the clad material portion 41 by welding over substantially the entire X direction. Similarly, the side surface 43a on the Y1 side of the joining material portion 43 can be joined to the side surface 41b of the clad material portion 41 by welding over substantially the entire X direction.

Further, the thickness (length in the Z direction) t3 of the joint material portion 42 and the thickness (length in the Z direction) t4 of the joint material portion 43 are substantially the same as the thickness t2 of the clad material portion 41 (clad material 6). It's okay. Further, the surface 42b on the Z1 side of the joint material portion 42, the surface 43b on the Z1 side of the joint material portion 43, and the surface 41c of the first layer 61 on the Z1 side of the clad material portion 41 may be substantially flush with each other. .. That is, the surface 42b on the Z1 side of the joint material portion 42 and the surface 43b on the Z1 side of the joint material portion 43 are Z1 more than the surface 41c of the first layer 61 on the Z1 side in the thickness direction (Z direction) of the clad material portion 41. It may be formed so as not to protrude to the side. Similarly, the surface 42c on the Z2 side of the joint material portion 42, the surface 43c on the Z2 side of the joint material portion 43, and the surface 41d on the Z2 side (second layer 62) of the clad material portion 41 are substantially flush with each other. It's okay. That is, the surface 42c on the Z2 side of the joint material portion 42 and the surface 43c on the Z2 side of the joint material portion 43 are Z2 more than the surface 41d of the second layer 62 on the Z2 side in the thickness direction (Z direction) of the clad material portion 41. It may be formed so as not to protrude to the side. As a result, the joining material portion 42 covers substantially the entire side surface 41a of the clad material portion 41, and the joining material portion 43 covers substantially the entire side surface 41b of the clad material portion 41, respectively. It is joined to the clad material portion 41 as described above.

As shown in FIG. 2, the joint material portion 42 can have a bent portion 42d formed in the vicinity of the end portion on the Y1 side. The bent portion 42d may be formed by bending the vicinity of the end portion of the joint material portion 42 on the Y1 side at about 90 degrees. As a result, the bent portion 42d may be formed with a joint portion 42e extending along the inner side surface 5a extending in the Z direction of the lower housing 5. Then, the joint portion 42e of the bent portion 42d and the inner side surface 5a of the lower housing 5 can be welded at the joint portion B3 over substantially the entire X direction. As a result, the composite material 4 is fixed to the lower housing 5. Although different from the first embodiment shown in FIGS. 1 and 2, the vicinity of the end portion of the joint material portion 42 on the Y1 side is replaced with the above welding by caulking or screwing at the joint portion B3. It may be joined. Further, the vicinity of the end portion on the Y2 side of the joint material portion 43 may be joined by caulking or screwing instead of the above welding, as in the vicinity of the end portion on the Y1 side of the joint material portion 42. ..

Next, a method for producing the composite material 4 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

(Manufacturing of clad material)
First, it is desirable to produce a flat plate-shaped (referred to as a strip-shaped) clad material 6 that is long in the transport direction (X direction). As an example of a specific step of manufacturing the clad material 6, as shown in FIG. 3, a pair of strip-shaped first metal plates 161 and second metal plates 162 and strip-shaped third metal plates 163 are prepared. The first metal plate 161 and the second metal plate 162 are made of stainless steel, Ti or Ti alloy, and the first metal plate 161 and the second metal plate 162 are made of the same kind of metal. The third metal plate 163 is composed of Cu and Cu alloy, and Al is also composed of Al alloy. Further, the thickness of the first metal plate 161, the thickness of the second metal plate 162, and the thickness of the third metal plate 163 are the first layer 61, the third layer 63, and the second layer in the clad material 6 to be produced. It is appropriately selected according to the thickness ratio of 62 (t11: t13: t12, see FIG. 2).

Then, in a state where the first metal plate 161, the third metal plate 163, and the second metal plate 162 are laminated in this order, clad rolling is continuously performed by rolling and joining using a rolling roller 201 ((). Rolling process) is desirable. As a result, a strip-shaped pressure-welded material 106 is produced in which the first metal plate 161, the third metal plate 163, and the second metal plate 162 are laminated to each other (rolling and joining) in this order in the thickness direction. To. The number of clad rolling passes (number of rolling times) can be appropriately selected.

Then, it is desirable to continuously perform diffusion annealing (annealing step) using an annealing furnace 202 set to an appropriate annealing temperature. As a result, at the interface between the first metal plate 161 and the third metal plate 163 and the interface between the third metal plate 163 and the second metal plate 162, the layers form an interatomic bond by diffusion treatment to firmly form an interatomic bond. Join. As a result, a strip-shaped clad material 6 is produced in which the first layer 61, the third layer 63, and the second layer 62 shown in FIG. 2 are laminated in this order in the thickness direction and diffusely joined to each other.

(Manufacturing method of composite material)
Further, it is desirable to prepare a strip-shaped joining material 142 and a joining material 143, which are made of a metal plate material of the same type as the first metal plate 161 and the second metal plate 162. It is desirable that the thickness of the strip-shaped joining material 142 and the thickness of the joining material 143 are substantially equal to the thickness t2 of the strip-shaped clad material 6 (see FIG. 2). Then, while transporting the strip-shaped clad material 6 in the transport direction (X direction), the side surfaces 42a and the joining material 143 of the joining material 142 are placed on the side surfaces 41a and the side surface 41b (see FIG. 2) of the strip-shaped clad material 6, respectively. It is desirable that the side surfaces 43a are brought into contact with each other. At this time, by applying a slight pressure so as to press the joining material 142 and the joining material 143 against the side surface 41a and the side surface 41b of the clad material 6, respectively, the joining material 142 and the side surface 41a of the clad material 6 are joined together. Preloading may be performed between the material 143 and the side surface 41b of the clad material 6.

Then, it is desirable to continuously join the strip-shaped joining material 142 and the joining material 143 to the strip-shaped clad material 6 (joining step). Specifically, as shown in FIG. 4, in a state where the side surface 42a of the bonding material 142 is in contact with the side surface 41a of the strip-shaped clad material 6, a predetermined strength (output) is applied to the contact portion by the laser welder 203a. ) And a laser beam having a predetermined spot diameter can be irradiated. As a result, the metal in the vicinity of the side surface 41a of the clad material 6 and the metal in the vicinity of the side surface 42a of the bonding material 142 can be bonded by melting with the heat of the laser beam and then cooling. As a result, the strip-shaped joint material 142 and the strip-shaped clad material 6 are welded. It should be noted that the irradiation of the laser beam is not limited to the method performed on one side of the band-shaped clad material 6 as shown in FIG. 4, and the method of performing the laser light irradiation on both sides of the band-shaped clad material 6 can also be adopted.

Further, in a state where the side surface 43a of the joining material 143 is in contact with the side surface 41b of the strip-shaped clad material 6, the abutting portion is irradiated with a laser beam having a predetermined intensity and a predetermined spot diameter by a laser welder 203b. Can be done. As a result, the metal in the vicinity of the side surface 41b of the clad material 6 and the metal in the vicinity of the side surface 43a of the bonding material 143 can be bonded by melting with the heat of the laser beam and then cooling. As a result, the strip-shaped joint material 143 and the strip-shaped clad material 6 are welded along the transport direction (X direction). As a result, a strip-shaped composite material 104 including a clad material portion 41 made of the clad material 6, a joining material portion 42 made of the joining material 142, and a joining material portion 43 made of the joining material 143 is produced. Will be done.

Then, as shown in FIG. 3, it is desirable to continuously bend the joint material portion 42 of the strip-shaped composite material 104 (bending step) by using the bending roller 204. As a result, the strip-shaped composite material 4 in which the bent portion 42d (see FIG. 2) is formed along the transport direction (X direction) in the vicinity of the end portion of the joint material portion 42 on the Y1 side is produced. Finally, it is desirable to use a cutting machine 205 to cut the strip-shaped composite material 4 so as to have a predetermined length in the transport direction (X direction, longitudinal direction) (cutting step). As a result, the composite material 4 having a predetermined shape and dimension required for the portable device 100 such as the flat plate shown in FIGS. 1 and 2 is produced.

By performing heat treatment as necessary before the bending step or the cutting step, the strip-shaped composite material 104 (4) can be annealed or modified. During the heat treatment, the heat treatment temperature when the first layer 61 and the second layer 62 and the joint material portion 42 and the joint material portion 43 are made of stainless steel, for example, when they are made of austenitic stainless steel, is 850 ° C. or higher. It is preferably 1050 ° C. or lower. Further, when the first layer 61 and the second layer 62 and the joining material portion 42 and the joining material portion 43 are made of, for example, ferritic stainless steel, the heat treatment temperature is preferably 750 ° C. or higher and 950 ° C. or lower. Moreover, it is preferable to quench after the heat treatment.

Further, the heat treatment temperature when the first layer 61 and the second layer 62 and the joining material portion 42 and the joining material portion 43 are composed of Ti is preferably 650 ° C. or higher and 750 ° C. or lower. Further, the heat treatment temperature when the first layer 61 and the second layer 62 and the bonding material portion 42 and the bonding material portion 43 are composed of a Ti alloy generally increases the recrystallization temperature as the elements other than Ti increase. Therefore, it can be appropriately set according to the type of Ti alloy in consideration of the fact that the temperature needs to be higher than that of Ti (pure titanium) and that phase transformation occurs depending on the type of Ti alloy.

Further, when the periphery of the joint portion B1 is raised with respect to the surface 41c or the surface 41d of the clad material portion 41, or the periphery of the joint portion B2 is raised with respect to the surface 41c or the surface 41d of the clad material portion 41. In some cases, the raised portion can be removed and flattened by performing polishing, skin pass rolling, or the like. Thereby, the surface 42b of the joining material portion 42, the surface 43b of the joining material portion 43, and the surface 41c of the clad material portion 41 can be made substantially flush with each other, and the surface 42c of the joining material portion 42 and the surface 42c of the joining material portion 42 can be made substantially flush with each other. It is possible to make the surface 43c of the joint material portion 43 and the surface 41d of the clad material portion 41 substantially flush with each other.

As shown in FIGS. 1 and 2, the produced composite material 4 is arranged in the lower housing 5 of the mobile device 100, and has the inner side surface 5a and the bent portion 42d of the lower housing 5. The joint portion 42e of the above is welded.

In the first embodiment, the following effects can be obtained.

In the first embodiment, as described above, the first layer 61 and the second layer 62 made of stainless steel, Ti or Ti alloy, and the first layer 61 and the second layer 62 are arranged and Cu. , Cu alloy, Al or the side surface 41b extending in the thickness direction (Z direction) of the clad material portion 41 composed of the clad material 6 to which the third layer 63 composed of Al or Al alloy is bonded, respectively. The joining material portion 42 and the joining material portion 43 made of the same type of metal (stainless steel) as the first layer 61 and the second layer 62 are joined. As a result, the first layer 61 and the second layer 62 made of stainless steel having high corrosion resistance, Ti or Ti alloy make the third layer 61 made of Cu, Cu alloy, Al or Al alloy having low corrosion resistance. Both surfaces of the layer 63 in the thickness direction are covered. In addition, the bonding material portion 42 and the bonding material portion 43 made of highly corrosion-resistant stainless steel, Ti or Ti alloy (the same type of metal as the first layer 61 and the second layer 62) are the side surfaces of the clad material portion 41. By being joined to the side surface 41a and the side surface 41b, respectively, the bonding material portion 42 and the bonding material portion 43 can cover the third layer 63 on the side surface 41a and the side surface 41b of the clad material portion 41. As a result, it is possible to provide a material (composite material 4) capable of suppressing corrosion of the side surface in the thickness direction of the third layer 63 having low corrosion resistance of the clad material portion 41 composed of the clad material 6. Can be done.

Further, in the first embodiment, the joining material portion 42 and the joining material portion 43 are made of the same metal as the first layer 61 and the second layer 62 of the clad material 6. As a result, as compared with the case where the joining material portion 42 and the joining material portion 43 are made of a different kind of metal from the first layer 61 and the second layer 62 of the clad material portion 41 made of the clad material portion 6, the clad material portion 42 and the joining material portion 43 are made of a different kind of metal. On the side surface 41a and the side surface 41b of the portion 41, the clad material portion 41 and the joining material portion 42 and the joining material portion 43 can be firmly and easily joined, respectively. As a result, it is possible to surely form a state in which the third layer 63 is covered by the joining material portion 42 and the joining material portion 43 on the side surface 41a and the side surface 41b of the clad material portion 41.

Further, in the first embodiment, since the third layer 63 is composed of Cu, Cu alloy, Al or Al alloy having good thermal conductivity (and conductivity), the first layer is made of stainless steel, Ti or Ti alloy. It is possible to provide a composite material 4 having corrosion resistance in the layers 61 and the second layer 62, the bonding material portion 42, and the bonding material portion 43, and having good thermal conductivity (and conductivity) in the third layer 63. .. As a result, the corrosion-resistant composite material 4 can be suitably used as a heat sink (or a conductive member that requires conductivity) that requires thermal conductivity.

Further, in the first embodiment, it is preferable that the first layer 61, the second layer 62, the joining material portion 42, and the joining material portion 43 are all made of stainless steel. As a result, the third layer 63 is corroded by the joint material portion 42 and the joint material portion 43 made of stainless steel, which are easier to weld and cheaper than those made of Ti or Ti alloy. Since it can be suppressed, the composite material 4 capable of suppressing the corrosion of the third layer 63 can be easily and inexpensively produced. Further, by constructing the third layer 63 preferably from Cu or a Cu alloy, the thermal conductivity (and conductivity) in the clad material portion 41 of the composite material 4 is higher than that of the third layer 63 being composed of Al or Al alloy. Can be further improved. As a result, the corrosion-resistant composite material 4 can be more preferably used as a heat sink (or a conductive member that requires conductivity) that requires thermal conductivity.

Further, in the first embodiment, the first layer 61, the second layer 62, the joint material portion 42, and the joint material portion 43 are both preferably made of austenitic stainless steel, preferably austenitic stainless steel. With this configuration, the first layer 61 and the second layer 62 made of austenitic stainless steel and the third layer made of Cu, Cu alloy, Al or Al alloy are both non-magnetic. Therefore, it is possible to prevent the composite material 4 from being magnetized. As a result, it is possible to prevent problems caused by the magnetism of the composite material 4 from occurring in the peripheral electronic components 3 and the like in which the composite material 4 is used.

Further, in the first embodiment, the joining material portion 42 and the joining material portion 43 are preferably joined to the side surface 41a and the side surface 41b of the clad material portion 41 by welding, respectively. As a result, the joining material portion 42 and the joining material portion 43 can be reliably joined to the side surface 41a and the side surface 41b of the clad material portion 41 by welding, respectively.

Further, in the first embodiment, the composite material 4 may be strip-shaped or square-shaped, and the joining material portion 42 and the joining material portion 43 face each other in a direction orthogonal to the thickness direction of the clad material portion 41, respectively. It can be joined along a pair of side surfaces, eg, side surfaces 41a and side surfaces 41b extending in the longitudinal direction (X direction). As a result, on at least two opposite side surfaces (side surface 41a and side surface 41b) of the plurality of side surfaces extending in the thickness direction (Z direction) of the strip-shaped or square clad material portion 41, for example, in the lateral direction (Y direction). ), The third layer 63 can be prevented from corroding on the side surface 41a and the side surface 41b in the X direction, which have a larger exposed area than the side surface of the third layer 63. As a result, the corrosion of the third layer 63 can be suppressed in a large region of the composite material 4. Further, when the clad material 6 is continuously produced by rolling, it is preferable that the strip-shaped clad material after rolling while joining the joint material portion 42 and the joint material portion 43 to the side surface 41a and the side surface 41b extending in the X direction, respectively. By transporting 6, it is possible to easily and efficiently obtain the composite material 4 in which the joint material portion 42 and the joint material portion 43 are joined to the side surface 41a and the side surface 41b extending in the X direction of the clad material portion 41, respectively. ..

Further, in the first embodiment, the joining material portion 42 is placed in the vicinity of the joining interface F1 between the clad material portion 41 and the joining material portion 42 and the joining interface F1 (joining portion B1) in the thickness direction (Z) of the clad material portion 41. It can be formed substantially flush with the surface 41c on one side (Z1 side) of the direction). Further, the joining material portion 43 is placed on the other side (Z2 side) of the clad material portion 41 in the thickness direction in the vicinity of the joining interface F2 and the joining interface F2 (joining portion B2) between the clad material portion 41 and the joining material portion 43. It can be formed substantially flush with the surface 41d. That is, the thickness t3 of the joint material portion 42 and the thickness t4 of the joint material portion 43 can be made substantially equal to the thickness t2 of the clad material portion 41. As a result, the surface 42b of the joint material portion 42 and the surface 43b of the joint material portion 43 are suppressed from protruding from the surface 41c of the clad material portion 41 to the Z1 side, and the surface 42c of the joint material portion 42 and the joint material portion are suppressed. It is suppressed that the surface 43c of the 43 protrudes from the surface 41d of the clad material portion 41 toward the Z2 side. As a result, it is possible to prevent the thickness t1 of the composite material 4 from increasing.

Further, in the first embodiment, the bent portion 42d in which the joint material portion 42 is bent and deformed can be included. As a result, when the joint material portion 42 is welded to another member (lower housing 5), welding or the like can be performed to the bent portion 42d that has been bent and deformed. Therefore, for example, the thickness of the other member is thick. In the case of a member extending in the direction (Z direction), the bent portion 42d can be arranged along the other member (inner side surface 5a of the lower housing 5), so that the joint member portion 42 can be placed along the other member. Can be easily joined to the members of the above by welding or the like.

Further, in the first embodiment, the length L2 of the clad material portion 41 is preferably the composite material 4 in the Y direction orthogonal to the thickness direction in which the clad material portion 41, the joint material portion 42, and the joint material portion 43 are present. It is more than 1/2 of the length L1 of. As a result, in the composite material 4, it is possible to sufficiently secure the clad material portion 41 having the third layer 63 having good thermal conductivity (and conductivity), so that the composite material 4 has thermal conductivity (and conductivity). Can be fully demonstrated.

[Second Embodiment]
Next, with reference to FIGS. 5 and 6, the configuration of the composite material 304 (hereinafter referred to as the composite material 304) of the clad material and the metal according to the second embodiment of the present invention will be described. In this second embodiment, unlike the composite material 4 in which the joining material portion 42 and the joining material portion 43 are joined to the side surface 41a and the side surface 41b in the Y direction of the clad material portion 41 of the first embodiment, respectively, the clad material portion An example in which the joining material portion 342 is joined to all the side surfaces 341a of the 341 will be described. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The composite material 304 of the second embodiment is composed of a clad material portion 341 composed of a clad material 6 having a three-layer structure and a stainless steel, Ti or Ti alloy, and has a thickness direction (Z direction) of the clad material portion 341. Includes a composite portion 342 joined to all parallel side surfaces 341a.

Specifically, the clad material portion 341 is formed in a square shape or a rectangular shape (referred to as a rectangular shape) in a plan view from the Z direction. Further, in a plan view from the Z direction, the joining material portion 342 is formed in a frame shape having a rectangular hole portion corresponding to the rectangular clad material portion 341. Then, both side surfaces extending in the X direction orthogonal to the Z direction and both side surfaces extending in the Y direction (side surface 341a shown in FIG. 6) of the clad material portion 341, and both side surfaces extending in the X direction of the frame-shaped joining material portion 342. A composite material 304 in which the joining material portion 342 is joined to substantially the entire surface of the side surface 341a of the clad material portion 341 by being joined in a state where both side surfaces extending in the Y direction (side surfaces 342a shown in FIG. 6) are in contact with each other. Is configured.

In the composite material 304, the clad material portion 341 and the joining material portion 342 can be joined by brazing. That is, by arranging the brazing material substantially in the entire space between the side surface 341a of the clad material portion 341 and the side surface 342a of the frame-shaped joining material portion 342, the brazing material is heated, melted, cooled and solidified, whereby the clad material is solidified. The portion 341 and the joining material portion 342 can be joined via a brazing material (referred to as brazing joint). As the brazing material used for brazing, a Ni-based brazing material or Ag brazing material is used when the clad material portion 341 and the joining material portion 342 are made of stainless steel in order to sufficiently secure the joining strength. A noble metal-based brazing material such as the above is preferable, and when the clad material portion 341 and the bonding material portion 342 are formed by using Ti or a Ti alloy, a Ti-based brazing material is preferable.

Of the directions orthogonal to the thickness direction of the composite material 304, the length L12 of the clad material portion 341 is preferably ½ or more of the length L11 of the composite material 304 in the Y direction. Further, in the direction orthogonal to the thickness direction of the composite material 304, the length L22 of the clad material portion 341 is preferably ½ or more of the length L21 of the composite material 304 in the X direction. The preferable ratio of the length of the clad material portion 314 to the composite material 304 is the same as the preferable ratio of the length of the clad material portion 41 to the composite material 4 of the first embodiment.

The joint material portion 342 is composed of stainless steel, Ti or a Ti alloy, both of which are the same metals as the first layer 61 and the second layer 62. Further, in the vicinity of the joining interface F11 and the joining interface F11 (joining portion B11) between the clad material portion 341 and the joining material portion 342, the Z1 side of the surface 41c on one side (Z1 side) of the clad material portion 341 in the thickness direction. It can be formed so as not to protrude from the surface 41d on the other side (Z2 side) of the clad material portion 341 in the thickness direction so as not to protrude from the surface 41d. In the composite material 304 shown in FIG. 6, the thickness (length in the Z direction) t5 of the joint material portion 342 is formed to be slightly smaller than the thickness t21 of the composite material 304 (thickness t22 of the clad material portion 341). The joining material portion 342 can be joined to the clad material portion 341 so as to cover the third layer 63 over the entire side surface 341a of the clad material portion 341.

Further, the thickness t21 of the composite material 304 in the second embodiment is 1 mm or less. The other configurations of the composite material 304 in the second embodiment are the same as those in the first embodiment.

Next, a method for manufacturing the composite material 304 according to the second embodiment of the present invention will be described with reference to FIGS. 5 to 7.

First, as shown in FIG. 7, in the same manner as in the first embodiment, the rolling roller 201 is in a state where the first metal plate 161, the third metal plate 163, and the second metal plate 162 are laminated in this order. A strip-shaped pressure-welded material 106 is produced by continuously performing clad rolling (rolling step) to be rolled and joined using It is desirable to prepare the clad material 6 of. Then, it is desirable to use a cutting machine 205 to cut the strip-shaped clad material 6 so as to have a predetermined length. As a result, the rectangular clad material 6 (see FIG. 5) is produced in a plan view from the Z direction.

The first metal plate 161 and the second metal plate 162 are made of stainless steel, Ti or Ti alloy, and the first metal plate 161 and the second metal plate 162 are made of the same kind of metal. The third metal plate 163 is composed of Cu and Cu alloy, and Al is also composed of Al alloy. Further, the thickness of the first metal plate 161, the thickness of the second metal plate 162, and the thickness of the third metal plate 163 are the first layer 61, the third layer 63, and the second layer in the clad material 6 to be produced. It is appropriately selected according to the thickness ratio of 62 (t11: t13: t12, see FIG. 2).

Further, in a plan view from the Z direction, a rectangular hole portion is formed so as to correspond to the rectangular clad material 6, and is composed of a metal plate material of the same type as the first metal plate 161 and the second metal plate 162. It is desirable to prepare a frame-shaped joint material. Then, with the clad material 6 arranged in the bonding material, the side surface 341a of the clad material 6 and the side surface (side surface 342a) of the bonding material are joined in an annular shape by brazing using the brazing material (joining step). Is desirable. As a result, the brazing material between the side surface 341a of the clad material 6 and the side surface (side surface 342a) of the joining material causes the side surface 341a of the clad material 6 and the side surface of the frame-shaped joining material (side surface 342a) via the brazing material. Is joined. As a result, a composite material 304a including a clad material portion 341 composed of the rectangular clad material 6 and a frame-shaped joining material portion 342 is produced.

Then, it is desirable that the composite material 304a is polished as necessary to remove unnecessary brazing material (raised portion due to brazing contact) on the surface of the composite material 304a (polishing step). As a result, the composite material 304 shown in FIGS. 5 and 6 is produced. The composite material 304a can be annealed or modified by performing a heat treatment as necessary before the polishing step.

In the second embodiment, the following effects can be obtained.

In the second embodiment, as described above, the first layer 61 and the second layer 62 made of stainless steel, Ti or Ti alloy, and the first layer 61 and the second layer 62 are arranged and Cu. , Cu alloy, Al or the side surface 41b extending in the thickness direction (Z direction) of the clad material portion 341 composed of the clad material 6 bonded to the third layer 63 composed of Al or Al alloy, respectively. A bonding material portion 342 composed of a metal (stainless steel, Ti or Ti alloy) of the same type as that of the first layer 61 and the second layer 62 is bonded. Thereby, as in the first embodiment, it is possible to provide a material (composite material 304) capable of suppressing corrosion of the third layer 63 of the clad material 6 (clad material portion 341).

Further, in the second embodiment, the joining material portion 342 can be joined along all the side surfaces 341a parallel to the thickness direction (Z direction) of the clad material portion 241. As a result, it is possible to prevent the third layer 63 from corroding on all the side surfaces 341a. The other effects of the second embodiment are the same as those of the first embodiment.

[Example]
Next, a welding test between the clad material and the joining material performed to confirm the effect of the present invention will be described. In the welding test, a composite material of the clad material and the metal was produced by actually laser welding the clad material and the joining material. Then, the bonded state of the produced composite material was observed.

Specifically, first, a clad material 6 (see FIGS. 2 and 3) was prepared. At this time, the first layer 61 and the second layer 62 are made of SUS316L (JIS standard), which is an austenitic stainless steel. Further, the third layer 63 is made of oxygen-free copper which is Cu. The thickness ratio (t2: t4: t3) of the first layer 61, the third layer 63, and the second layer 62 is 1: 2: 1, and the thickness t2 of the clad material 6 is 0.2 mm. Material 6 was produced. The joining material (see FIG. 3) to be joined to the side surface of the clad material 6 is made of SUS316L, which is the same as the first layer 61 and the second layer 62, and has a thickness of 0.2 mm, which is the same as the thickness t2 of the clad material 6. The plate material (SUS plate material) to be used was used.

Then, a welding test was conducted to prepare the test materials 1 to 8. In the welding test, the side surface extending in the thickness direction (Z direction) of the clad material 6 (see the side surface 41a shown in FIG. 2) and the side surface of the joining material (see the side surface 42a shown in FIG. 2) are in contact with each other. Laser welding was performed in the same manner as in one embodiment. Here, YLR-150-1500QCW-AC manufactured by IPG Photonics was used as the laser optical oscillator in the laser welder. Further, as the welding environment at the time of laser welding, a nitrogen gas atmosphere was set and the welding speed was set to 10 m / min. Further, the spot diameter was set to 40 μm.

In this welding test, in the test materials 1 to 7, laser light is emitted from one side in the thickness direction of the clad material and the joint material (see the laser light irradiation side shown in FIG. 8) to the contact interface between the clad material and the joint material. Irradiated. At that time, the output of the laser beam at the time of laser welding was changed by the test materials 1 to 7. Specifically, the output of the laser beam, which is 100% output at 250 W, is set to 35%, 40%, 45%, 50%, 55%, 60%, and 65%, respectively, with respect to the test materials 1 to 7, respectively. Welding was done.

Further, in the test material 8, the contact interface between the clad material and the joining material was simultaneously irradiated with laser light from both sides in the thickness direction of the clad material and the joining material. At that time, the laser beam irradiating the test material 8 had the same output of 40% as that of the test material 2.

Then, the test materials 1 to 8 which are composite materials of the clad material and the metal were cut in the thickness direction, and then the cut surface was etched. Then, the cut surface was observed using an optical microscope.

A photograph of the cut surface of the test materials 1 to 8 is shown in FIG. In the clad material portion of the composite material shown in FIG. 8, the uppermost layer on the laser irradiation side is the first layer, the intermediate layer is the third layer, and the lowermost layer is the second layer in the thickness direction.

As a result of the welding test, a non-welded portion was observed on the opposite side of the laser beam irradiation for the test material 1 and the test material 2 having a small laser beam output. This is because the heat generated by the laser beam irradiation does not sufficiently reach the side opposite to the laser beam irradiation, and the second layer of the clad material portion on the side opposite to the laser beam irradiation side and the SUS plate material of the bonding material portion are sufficient. It is probable that this is because it was melted and did not join. In the test material 1 and the test material 2 in which such a non-welded portion is generated, the joint strength between the clad material portion and the joint material portion is small, and most of the third layer of the clad material portion is sufficiently covered on the side surface. It is considered unfavorable because it has not been welded.

On the other hand, with respect to the test materials 3 to 7 having a large laser light output, the second layer of the clad material portion on the opposite side from the laser light irradiation side and the SUS plate material of the joint material portion were welded in the thickness direction. As a result, it was confirmed that by adjusting the output of the laser beam, it is possible to join the clad material portion and the joining material portion so that the non-welded portion does not occur. It should be noted that conditions other than the output of the laser beam, for example, the thickness of the composite material (clad material and the joining material), the spot diameter of the laser beam, the welding speed, and the like are adjusted so that the non-welded portion does not occur. It is considered possible to join the material part and the joint material part.

Although a composite material that does not generate a non-welded portion is preferable, even if the second layer of the clad material portion on the side opposite to the laser beam irradiation side where the non-welded portion is observed is not joined, the clad is not formed. When the third layer of the material portion is covered with the joint material portion, it is considered possible to use it as a composite material.

In addition, from cross-sectional observation using EDX (Energy Dispersive X-ray Analysis), it was found that Cu is more likely to diffuse from the third layer of the clad material portion to the welded portion as the output of the laser beam increases. .. A large amount of Cu diffuses into the welded portion in excess of the amount of Cu (about 0.3% by mass or less) contained in SUS316L constituting the SUS plate material of the first layer and the second layer of the clad material portion and the bonding material portion. If this is the case, it is considered that the joint strength of the welded portion tends to decrease. Therefore, the output of the laser beam in laser welding is in an appropriate range (for example, the output of the laser beam which is 100% output at 250 W is 50% or less, preferably 50% or less). It was found that it is better to select 45% or less, more preferably 40% or less). When the third layer of the clad material portion is made of Al or Al alloy, which is more likely to cause defects such as welding cracks than Cu or Cu alloy, in order to suppress defects such as welding cracks, it is necessary to suppress the occurrence of defects such as welding cracks. It is preferable to adjust the output of the laser beam so that the diffusion of Al to the welded portion is suppressed, or a part or all of the third layer becomes the non-welded portion. Specifically, for example, if a laser light oscillator having the same performance as described above is used, it is considered preferable to suppress the output of the laser light, which is 100% at 250 W, to 40% or less.

Further, as a result of the welding test of the test material 8, the clad material portion and the joining material portion were joined without forming a non-welded portion. As a result, even if the output of the laser beam is small enough to generate a non-welded portion on the side opposite to the laser beam irradiation side when the laser beam irradiation is only from one side, the laser beam is irradiated from both sides in the thickness direction. By doing so, it was confirmed that it is possible to sufficiently join the clad material portion and the joining material portion. When the contact interface between the clad material and the joint material is simultaneously irradiated with laser light from both sides in the thickness direction of the clad material and the joint material as in the test material 8, the first layer in the clad material portion. It may also occur that part or all of the third layer between the and the second layer is a non-welded portion and is not joined. Even in this case, although a composite material in which a non-welded portion does not occur is preferable, it is considered possible to use the composite material because the third layer of the clad material portion is covered with the joint material portion. Further, when the third layer of the clad material portion is composed of Al or Al alloy which is more likely to cause defects such as welding cracks than Cu or Cu alloy, a part or all of the third layer is a non-welded portion. By joining in this way, it is possible to suppress the occurrence of defects such as welding cracks.

The joint strength was actually measured for the test material 7 and the test material 8 by performing a tensile test in which the clad material portion and the joint material portion were pulled in the opposite direction with the joint portion as a boundary. At this time, the bonding strength of the test material 7 was 468 MPa, and the bonding strength of the test material 8 was 282 MPa. From this, it was confirmed that the composite material has sufficient bonding strength.

[Modification example]
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims.

For example, in the composite material 4 of the first embodiment and the composite material 304 of the second embodiment, the first layer 61 and the second layer 62 of the clad material portion 41 and the first layer 61 and the second layer of the clad material portion 341 are used. Assuming that the layer 62, the bonding material portion 42, the bonding material portion 43, and the bonding material portion 342 are all composed of stainless steel, Ti, or a Ti alloy, in the examples, an austenitic stainless steel (SUS316L) is used. As shown, the present invention is not limited to austenitic stainless steel (SUS316L). That is, in the present invention, the first layer and the second layer of the clad material portion and the bonding material portion may be made of stainless steel other than austenitic stainless steel (SUS316L), Ti or Ti alloy. When joining the clad material portion and the joining material portion, which are both composed of Ti or Ti alloy, by brazing, a Ti-based brazing material is used as the brazing material in order to secure sufficient joining strength. Is preferable. As a result, the weight of the composite material can be further reduced as compared with the case where the first layer and the second layer of the clad material portion and the joint material portion are made of stainless steel.

Further, in the composite material 4 of the first embodiment and the composite material 304 of the second embodiment, the third layer 63 of the clad material portion 41 and the third layer 63 of the clad material portion 341 are both Cu and Cu alloys. , Al or Al alloy is shown in the examples, but the present invention is not limited to Cu (oxygen-free copper). That is, in the present invention, the third layer (intermediate layer) of the clad material portion may be composed of a Cu alloy other than Cu (oxygen-free copper), Al or Al alloy. When the third layer of the clad material portion is made of Cu alloy, the mechanical strength and conductivity of the composite material can be increased as compared with the case where the third layer of the clad material part is made of Cu. Is. Further, when the third layer of the clad material portion is made of Al or Al alloy, the weight of the composite material can be reduced as compared with the case where the third layer of the clad material portion is made of Cu or Cu alloy. It is possible.

Further, in addition to the configurations of the composite material 4 of the first embodiment and the composite material 304 of the second embodiment, a connection provided so that the side surface of the clad material portion and the outside can be thermally and electrically connected. Members may be added. Specifically, as in the composite material 404 of the modified example of the first embodiment shown in FIG. 9, the connecting member 447 is sandwiched between the joining interface F21 between the clad material portion 441 and the joining material portion 442, and the clad material portion 441 is sandwiched. The clad material portion 441 may be joined to the joining material portion 442 and the joining material portion 443, respectively, with the connecting member 448 sandwiched between the joining interface F22 and the joining material portion 443. The connecting member 447 and the connecting member 448 are respectively drawn out from the joining interface F21 and the joining interface F22, and are connected to the composite material 404 with other members (not shown). It is preferable that the connecting member 447 and the connecting member 448 are arranged so as to be in contact with a part or all of the third layer 63 on the side surface 41a and the side surface 41b of the clad material portion 441, respectively. Thereby, the connecting member 447 and the connecting member 448 can directly thermally and electrically connect the clad material portion 441 and the outside without the intervention of the joining material portion 442 and the joining material portion 443. As a result, Cu, Cu alloy, Al also have a relatively low thermal conductivity and conductivity compared to the third layer composed of Al alloy, and the bonding material portion 442 composed of Ti or Ti alloy and It is possible to suppress the decrease in thermal conductivity and conductivity of the composite material 404 due to the bonding material portion 443. When the joining material portions such as the joining material portion 442 and the joining material portion 443 are provided, for example, in the composite material 4 of the first embodiment, the third layer 63 is exposed regardless of whether or not the third layer 63 is exposed. The layer 63 may be configured to have joint material portions on both side surfaces in the X direction. Further, the connecting member of the present invention may be used in an application in which only heat conduction is mainly performed and electrical conduction is not substantially performed, or a connection member in the present invention may be used in an application in which only electrical conduction is mainly performed and heat conduction is not substantially performed.

Further, in the first embodiment, the side surface 42a of the joint material portion 42 and the side surface 43a of the joint material portion 43 are orthogonal to the side surface 41a and the side surface 41b of the clad material portion 41 in the thickness direction (X). Although an example of joining by welding over substantially the entire direction) is shown, the present invention is not limited to this. Further, in the second embodiment, an example is shown in which substantially the entire surface of the side surface 341a of the clad material portion 341 and the side surface 342a of the frame-shaped joining material portion 342 are joined, but the present invention is not limited to this. .. In the present invention, if it is possible to cover the third layer 63 on the side surface 41a of the clad material portion 41 and the side surface 341a of the clad material portion 341, the third layer 63 is covered substantially in the direction orthogonal to the thickness direction of the side surface of the clad material portion. It is not necessary to join the joining material portion, and for example, the clad material portion and the joining material portion may be joined in a spot manner.

Further, in the first embodiment, an example of joining the clad material portion 41 to the joining material portion 42 and the joining material portion 43 by laser welding is shown, but the present invention is not limited to this. Further, in the second embodiment, an example of joining the clad material portion 341 and the joining material portion 342 by brazing is shown, but the present invention is not limited to this. In the present invention, the joining method between the clad material portion and the joining material portion is not particularly limited. For example, the clad material portion and the joining material portion may be joined by irradiating with an electron beam (electron beam welding).

Further, in the first embodiment, an example in which the bent portion 42d is provided on the joint material portion 42 on one side (Y1 side) in the direction (Y direction) orthogonal to the thickness direction of the composite material 4 is shown. Is not limited to this. In the present invention, both sides in the lateral direction orthogonal to the thickness direction of the composite material (corresponding to the Y1 side and the Y2 side in FIG. 1 showing the first embodiment) or the longitudinal direction orthogonal to the thickness direction of the composite material. Bending portions may be provided on both sides (corresponding to the X1 side and the X2 side in FIG. 1 showing the first embodiment). Further, a bent portion is formed at an arbitrary position of the joint material portion 342 of the composite material 304 of the second embodiment, for example, at one or more of the X1 side, X2 side, Y1 side or Y2 side of the joint material portion 342 shown in FIG. May be provided.

Further, in the second embodiment, an example of joining the rectangular clad material portion 341 and the frame-shaped joint material portion 342 in a plan view from the Z direction (thickness direction) is shown. Not limited to. In the present invention, the shape of the clad material portion in the plan view from the thickness direction is not limited to the rectangular shape. The joint material portion may have a shape corresponding to the shape of the clad material portion.

Further, in the first embodiment, the composite material 4 is used in the portable device 100 because it has a function as a chassis for ensuring mechanical strength and a function as a heat sink for releasing heat to the outside. Although an example is shown, the present invention is not limited to this. In the present invention, the use of the composite material of the clad material and the metal is not particularly limited. For example, the composite material of the present invention may be used for a conductive member (bus bar) or the like used for electrical connection in a battery or the like. Further, the composite material 4 in the first embodiment may be configured to be used as a conductive member of a mobile device or the like in addition to the functions as a chassis and a heat sink.

4, 304, 404 Composite material of clad material and metal 6 Clad material 41, 341, 441 Clad material part 41a, 41b, 341a Side surface 41c (one side of clad material) Surface 41d (other side of clad material) Surface 42, 43, 342, 442 Joint material part 42d Bending part 61 1st layer 62 2nd layer 63 3rd layer F1, F2, F11, F21, F22 Joint interface

Claims (8)

A first layer and a second layer made of stainless steel, Ti or a Ti alloy, and a second layer arranged between the first layer and the second layer and made of Cu, Cu alloy, Al or Al alloy. A clad material portion composed of a clad material having a thickness of 1 mm or less to which three layers are joined , and a clad material portion.
It is composed of a member different from the clad material portion, is joined to a side surface extending in the thickness direction of the clad material portion, and is provided with a joining material portion made of the same kind of metal as the first layer and the second layer. ,
The joint material portion is a composite material of a clad material and a metal, which includes a bent portion that has been bent and deformed, and a joint portion that is joined to another member is formed on the outer peripheral surface of the bent portion . The first layer, the second layer, and the joint material portion are all made of stainless steel.
The composite material of a clad material and a metal according to claim 1, wherein the third layer is composed of Cu or a Cu alloy. The composite material of a clad material and a metal according to claim 2, wherein the first layer, the second layer, and the joint material portion are all made of austenitic stainless steel. The clad material portion has a band shape or a quadrangular shape, and the joint material portion is joined along a pair of opposite side surfaces in a direction orthogonal to the thickness direction of the clad material portion. Item 3. The composite material of the clad material and the metal according to any one of 3. The composite material of a clad material and a metal according to any one of claims 1 to 3 , wherein the joint material portion is joined along all the side surfaces parallel to the thickness direction of the clad material portion. .. The clad material and metal according to any one of claims 1 to 5 , further comprising a connecting member provided so that the side surface of the clad material portion and the outside can be thermally and electrically connected. Composite material. The bonding material portion does not protrude toward the one side of the bonding material portion between the bonding material portion and the bonding material portion and in the vicinity of the bonding interface with respect to the surface of the clad material portion on one side in the thickness direction. The clad material according to any one of claims 1 to 6 , which is formed so as not to protrude from the surface of the clad material portion on the other side in the thickness direction to the other side. Composite material with metal. The length of the clad material portion is ½ or more of the length of the composite material in the direction orthogonal to the thickness direction in which the clad material portion and the bonding material portion are present, according to claims 1 to 7 . The composite material of the clad material and the metal according to any one of the items.

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