JP2010018831A - Heat-receiving member and exhaust pipe heat-releasing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-receiving member having high performance in receiving, by radiation heat transfer, heat energy that is released from a heat source such as an exhaust pipe. <P>SOLUTION: This invention relates to the heat-receiving member which receives the heat energy released from the heat source, and which comprises: a base containing aluminum or an aluminum alloy; and a surface layer formed by alumite treatment of the surface of the base. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a heat receiving member and an exhaust pipe heat dissipation system.

The exhaust pipe connected to the automobile engine becomes extremely hot during operation because combustion gas (exhaust gas) flows. In the high engine load and high engine speed range, the amount of fuel is increased in order to suppress the rise in exhaust gas temperature. In this case, the fuel consumption deteriorates and the exhaust gas concentration increases. There is a problem that emission of harmful substances increases.
Further, when the temperature of the exhaust pipe rises due to the flow of high-temperature exhaust gas, it causes the thermal deterioration of the exhaust pipe.

In addition, a catalyst is provided in the exhaust pipe in order to treat exhaust gas discharged from the automobile engine. For example, a three-way catalyst can purify harmful substances such as nitrogen carbide (HC), carbon monoxide (CO), and nitrogen oxide (NOx) contained in exhaust gas.
In order to efficiently treat these harmful substances with a three-way catalyst, it is necessary to maintain the three-way catalyst at a predetermined activation temperature.

However, during high-speed operation of an automobile engine, the exhaust gas becomes high temperature, the temperature of the three-way catalyst goes out of the exhaust gas purification treatment area, and the harmful substances cannot be properly purified, or the three-way catalyst is thermally deteriorated by the high temperature exhaust gas. May end up.

Therefore, it is desired that the temperature of the exhaust pipe connected to the automobile engine does not increase excessively during high-speed operation of the automobile engine, and it is desired to cool the exhaust pipe appropriately.
Patent Document 1 discloses a heat insulator that can appropriately cool an exhaust pipe connected to an automobile engine.

JP-A-6-336923

FIG. 1 is an exploded perspective view schematically showing the vicinity of an automobile engine and an exhaust pipe connected to the automobile engine.
In FIG. 1, reference numeral 110 denotes an engine, and a cylinder head 117 is attached to the top of a cylinder block 116 of the automobile engine 110. An exhaust manifold 111 (hereinafter also referred to as an exhaust manifold) made of cast iron having high heat resistance is attached to one side surface of the cylinder head 117.

The exhaust manifold 111 has a function of collecting exhaust gas from each cylinder and further sending the exhaust gas to a catalytic converter or the like (not shown). That is, it functions as an exhaust pipe through which exhaust gas from the engine flows.
The exhaust manifold 111 is covered with a heat insulator 118 at a part of its outer peripheral surface. The heat insulator 118 is disposed at a predetermined distance from the outer peripheral surface of the exhaust manifold 111.

In Patent Document 1, the emissivity (injection rate) of the heat insulator is set to be equal to or higher than the emissivity of the exhaust manifold, and the amount of radiant heat transfer between the exhaust manifold and the heat insulator is increased by determining the relationship between the emissivities in this way. It is described that the cooling performance of the exhaust manifold can be improved.

In addition, in patent document 1, in order to improve the emissivity of the heat insulator which consists of cast iron, applying black heat-resistant coating material is described.

In recent years, aluminum or an aluminum alloy (hereinafter, also simply referred to as “aluminum”) is sometimes used as a material for a heat insulator in order to reduce the weight of a vehicle body.
However, if the heat insulator made of aluminum is placed so as to cover the exhaust manifold, aluminum is a material with low emissivity, so the heat received by the heat insulator by the radiant heat transfer from the exhaust pipe is too large. Don't be.
Therefore, when aluminum is used as the heat insulator, the temperature of the exhaust pipe cannot be lowered by radiant heat transfer, and the temperature of the exhaust pipe may increase excessively.

In order to increase the emissivity of aluminum, the present inventors have studied a method of applying a black heat-resistant paint in the same manner as in Patent Document 1 for such a problem. Since the adhesion was not obtained and the heat-resistant paint was peeled off from the aluminum, the emissivity of the aluminum could not be increased by this method.

The present invention has been made to solve such problems, and is made of aluminum or an aluminum alloy, and has a high ability to receive heat energy emitted from a heat source such as an exhaust pipe by radiant heat transfer, and An object of the present invention is to provide an exhaust pipe heat dissipation system that can prevent the temperature of the exhaust pipe from rising excessively.

That is, the heat receiving member according to claim 1 is a heat receiving member that receives heat energy emitted from a heat source, and includes a base material made of aluminum or an aluminum alloy, and a surface layer on which the base material surface is anodized. Features.

In the heat receiving member according to claim 1, a surface layer subjected to alumite treatment is formed on the surface of the base material made of aluminum or an aluminum alloy.
The emissivity of the surface layer formed by anodizing the surface of aluminum is higher than that of aluminum. When the surface layer has a high surface emissivity, the heat receiving member of the present invention is arranged with the surface layer facing the heat source such as an exhaust pipe, so that a large amount of heat generated from the heat source is received by radiant heat transfer. can do. That is, the heat receiving member of the present invention is excellent in the ability to receive heat from a heat source by radiant heat transfer. And if such a heat receiving member is used, the heat radiation from a heat source can be promoted.
In addition, the interface between the surface layer and aluminum produced by the alumite treatment is chemically stable, and since the adhesion between aluminum and the surface layer is high, the surface layer does not peel from the aluminum.

In the heat receiving member according to claim 2, the emissivity of the region away from the high temperature portion of the heat source is higher than the emissivity of other regions.
Here, the variation in temperature distribution within the heat source adjacent to the heat receiving member will be considered. Considering the temperature of each region of the heat receiving member, a large amount of heat is transmitted to the region close to the high temperature portion of the heat source, so the temperature of that region is likely to rise. On the other hand, since heat is not transmitted so much to a region away from the high temperature portion of the heat source, the temperature in that region is unlikely to rise. As a result, a high temperature region and a low temperature region are generated inside the heat receiving member. Further, thermal stress is applied to the heat receiving member due to a temperature difference inside the heat receiving member, and the heat receiving member may be distorted.

In the heat receiving member according to claim 2, the region having a higher emissivity than the other regions is a region where heat by radiant heat transfer is likely to be received, and thus the amount of heat received per unit area is large. And the area | region where the said emissivity is high becomes an area | region where the temperature rise by heat receiving tends to arise. Therefore, by arranging a region having a higher emissivity than the other regions at a position away from the high temperature portion of the adjacent heat source, the temperature of the heat receiving member easily rises even in a region away from the high temperature portion of the heat source. Therefore, it is possible to prevent a region having a low temperature from being generated inside the heat receiving member.
That is, the occurrence of a temperature difference inside the heat receiving member can be prevented. And it can prevent that a thermal stress is added to a heat receiving member, and distortion generate | occur | produces in a heat receiving member.

In the heat receiving member according to claim 3, fine holes are formed in the surface layer in the region away from the high temperature portion of the heat source, and metal is deposited in the fine holes.
If metal is deposited in the micropores in the surface layer, the emissivity in that region can be further increased. That is, by arranging the region where the metal is deposited in the micropores formed in the surface layer at a position away from the high temperature part of the heat source, it is possible to more effectively prevent a region having a low temperature inside the heat receiving member. can do.

In the heat receiving member according to claim 4, there is a region where the substrate surface is not alumite-treated and the substrate surface is exposed in a region close to the high temperature portion of the heat source.
In this case, the emissivity of the region where the substrate surface is exposed is low. And by arranging the region where the substrate surface of the heat receiving member is exposed at a position close to the high temperature portion of the heat source, the temperature of the heat receiving member is prevented from excessively rising even in the region close to the high temperature portion of the heat source. Thus, it is possible to prevent a region having a high temperature from being generated inside the heat receiving member. That is, the occurrence of a temperature difference inside the heat receiving member can be prevented.

In the heat receiving member according to claim 5, a plurality of cracks are formed in the surface layer.
Here, since the thermal expansion coefficient of the anodized surface layer is different from the thermal expansion coefficient of the aluminum or aluminum alloy that is the base material, when the temperature of the heat receiving member rises, it is between the base material and the surface layer. Thermal stress is applied. And when the thermal stress added between a base material and a surface layer is large, or when the thickness of a base material is thin, a cut | disconnection may generate | occur | produce in a base material (a base material tears).

In the heat receiving member according to claim 5, since a plurality of cracks are formed in the surface layer, a part of the thermal stress applied between the base material and the surface layer is absorbed by the crack portion, and the base material and the surface layer It is possible to prevent the thermal stress applied during the period from increasing. As a result, it is possible to prevent the substrate from being cut by thermal stress.

In the heat receiving member according to claim 6, the cracks are independent of each other.
If the cracks are independent of each other, when the thermal stress is applied to the surface layer, the thermal stress is absorbed by the development of the crack. Can do. Further, since the surface layer is continuous, the rigidity is increased and the shape is easily maintained.

In the heat receiving member according to claim 7, the crack is bent.
When the crack is bent, a resistance force is generated with respect to a force applied in a direction parallel to the crack, so that the base material can be more effectively prevented from being cut.

In the heat receiving member according to claim 8, the surface layer is formed on both surfaces of the base material.
In this case, since the alumite-treated surface layers are formed on both surfaces of the heat receiving member, the emissivity of both surfaces of the heat receiving member is increased. Then, a large amount of heat can be received on one surface and a large amount of heat can be radiated from the other surface. Therefore, it becomes difficult for the temperature of the heat receiving member to rise, and the thermal stress applied to the heat receiving member can be reduced.
In addition, since the amount of heat that can be received by the heat receiving member increases as the temperature of the heat receiving member decreases, the temperature of the heat receiving member does not easily rise even when receiving heat, so that the heat receiving member of the present invention is radiated. It can be set as the heat receiving member whose heat receiving capability by heat is still higher.

The exhaust pipe heat dissipation system according to claim 9 is an exhaust pipe made of a cylindrical base material made of metal;
The heat receiving member is arranged at a portion facing the outer peripheral surface of the exhaust pipe, and the heat receiving member is the heat receiving member according to any one of claims 1 to 8.
Since the heat receiving member of the present invention is a member having a high heat receiving capability by radiant heat transfer, if such a heat receiving member is disposed at a portion facing the outer peripheral surface of the exhaust pipe, the temperature of the exhaust pipe is high. When it becomes higher due to passage, a large amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe can be received by the heat receiving member. Therefore, it is possible to prevent the temperature of the exhaust pipe from rising excessively.

In the exhaust pipe heat dissipation system according to claim 10, a surface coating layer made of a crystalline inorganic material and an amorphous binder is provided on the outer peripheral surface of the base material of the exhaust pipe.
When a surface coating layer made of a crystalline inorganic material and an amorphous binder is provided, the emissivity of the outer peripheral surface of the exhaust pipe is increased, so that the amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe is increased. And the radiant heat transfer from the outer peripheral surface of an exhaust pipe is received by the heat receiving member of this invention with high heat receiving capability.
That is, since the improvement in the amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe and the improvement in the amount of heat received by the heat receiving member are combined, it is possible to more effectively prevent the temperature of the exhaust pipe from rising excessively. Can do.

In the exhaust pipe heat dissipation system according to claim 11, the emissivity of the exhaust pipe is 0.78 or more. If the emissivity of the exhaust pipe is in such a range, the amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe is improved, so that it is possible to more effectively prevent the temperature of the exhaust pipe from rising excessively.

(First embodiment)
Hereinafter, a heat receiving member and an exhaust pipe heat dissipation system according to a first embodiment of the present invention will be described with reference to the drawings.
First, the heat receiving member of the present invention will be described.
FIG. 2 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
The heat receiving member 1 shown in FIG. 2 includes a base material 20 made of aluminum or an aluminum alloy, and a surface layer 30 in which the surface of the base material 20 is anodized.

The surface layer obtained by subjecting the base material to alumite treatment has a higher emissivity than aluminum, and the emissivity (infrared emissivity) at a wavelength of 3 to 30 μm is, for example, 0.7 or more. The emissivity of the infrared rays can be measured using an emissometer (for example, AERD manufactured by KEM).

The type of aluminum or aluminum alloy used as the substrate is not particularly limited as long as it can be anodized. For example, pure aluminum (1000 series), Al-Cu-Mg series (2000 series) ), Al-Mn (3000), Al-Si (4000), Al-Mg (5000), Al-Mg-Si (6000), Al-Zn-Mg (7000) Etc. can be used.

The shape of the base material is not particularly limited, and can be a plate shape such as a flat plate, a curved plate, a bent plate, etc., and the shape is arbitrarily set according to the shape of the place where the heat receiving member is used. be able to. The substrate may be a laminate of a plurality of substrates.
Further, the thickness of the base material is not particularly limited, and can be arbitrarily set depending on the amount of heat to be received by the heat receiving member and the assumed use temperature of the heat receiving member.
When a heat receiving member is used in the exhaust pipe heat dissipation system of the present invention, the thickness of the base material used for producing the heat receiving member is desirably 0.1 to 1.5 mm, and is 0.3 to 1.0 mm. It is more desirable that the thickness is 0.4 to 0.8 mm.
If the thickness of the substrate is less than 0.1 mm, the strength is insufficient. On the other hand, when the thickness exceeds 1.5 mm, compressive strain and tensile strain applied to the surface layer when the substrate is deformed are increased.
When a plurality of base materials are laminated, the thickness of the base material is the sum of the thicknesses of the laminated base materials.

The thickness of the base material fluctuates before and after the alumite treatment. Assuming that an oxide film with a thickness ΔZ is formed on the basis of the surface position of the substrate by performing anodizing, an oxide film with a thickness ΔZ is formed on the bottom with respect to the surface position of the substrate at the same time. As a result, the thickness of the substrate is reduced by ΔZ.
Therefore, the thickness (2 × ΔZ) of the surface layer of the heat receiving member after the alumite treatment and the thickness (T) of the base material are measured, and the measured thickness is half the surface layer (ΔZ). It can be estimated that the thickness (ΔZ + T) obtained by adding the thickness (T) of the material is the thickness of the base material used for the production of the heat receiving member.

The surface layer on which the base material has been anodized is formed by energizing the electrolytic bath in the electrolytic bath with the base material as an anode (alumite treatment, anodizing treatment).
When the alumite treatment is performed only on one side of the substrate, it is desirable to protect it by attaching a masking tape or the like to the surface on which the alumite treatment is not performed.
The thickness of the surface layer is desirably 5 to 25 μm.
If the thickness of the surface layer is less than 5 μm, the emissivity will be low, and if the thickness of the surface layer exceeds 25 μm, the rigidity of the surface layer will increase and the thermal stress applied to the adjacent substrate will increase. The substrate is likely to be cut. Moreover, when the thickness of the surface layer exceeds 25 μm, the electrolytic coloring treatment becomes difficult. Further, even if the thickness of the surface layer exceeds 25 μm, the effect of improving the emissivity is not obtained so much that it takes time for the alumite treatment, which is inefficient.
In addition, the thickness of a base material and the thickness of a surface layer can be measured by observing the cross section of a heat receiving member using SEM etc.

As the electrolytic bath, in addition to the acidic bath, an alkaline bath or a non-aqueous bath such as formamide and boric acid can be used. Acid baths include sulfuric acid, phosphoric acid, chromic acid, oxalic acid, sulfosalicylic acid, pyrophosphoric acid, sulfamic acid, phosphomolybdic acid, boric acid, malonic acid, succinic acid, maleic acid, citric acid, tartaric acid, phthalic acid, itacone An aqueous solution in which one or more acids, malic acid, glycolic acid and the like are dissolved can be used.
Moreover, as an alkaline bath, the aqueous solution which melt | dissolved 1 type (s) or 2 or more types of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium phosphate, ammonia water etc. can be used.

As the current waveform during electrolysis, direct current, alternating current, AC / DC superimposition, AC / DC combined use, incomplete rectification waveform, pulse waveform, rectangular wave, and the like can be used.
Moreover, as an electrolysis method, a constant current, a low voltage, a constant power method, a high-speed alumite method applying continuous, intermittent, or current recovery can be used.

In the heat receiving member of this embodiment, fine holes may be formed in the surface layer.
FIG. 3 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 2 shown in FIG. 3, a large number of fine holes 40 are formed in the surface layer 30.
The fine holes 40 are holes generated in the surface layer when the thickness of the surface layer formed by performing the alumite treatment becomes 10 to 20 nm. When the alumite treatment is further continued, the thickness of the surface layer becomes thicker and the depth of the fine holes becomes deeper, and a large number of elongated fine holes 40 are formed in the surface layer.

Moreover, in the heat receiving member of this embodiment, the metal may be deposited in the said micropore.
FIG. 4 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 3 shown in FIG. 4, the metal 50 is deposited and deposited in the fine holes 40 shown in FIG. 3 by electrolytic coloring treatment.
If the metal is deposited in the fine pores by the electrolytic coloring treatment, the emissivity of the surface layer becomes higher.
Examples of the metal deposited in the micropore include metal elements such as Ni, Cu, Co, Pd, Sn, Pb, and Cd, and among these, Ni or Co is particularly desirable. This is because the emissivity of the surface layer can be increased.
Further, it is more preferable to use Ni because it is easy to seal the fine holes.

Examples of the method for depositing metal in the micropores include a method in which an electrolytic bath containing a metal is used and an electrolytic treatment is performed using a surface layer that has been anodized as a cathode.
The type of electrolytic bath used for depositing the metal is not particularly limited. For example, when depositing Ni, an electrolytic bath containing nickel sulfate can be used.

Alternatively, a silicate or zirconium hydroxide may be deposited in the fine pores by alternately immersing an aqueous solution of silicate or a zirconium salt water bath and an acid or alkali.

In the heat receiving member as shown in FIG. 3 and FIG. 4, the fine holes formed in the surface layer may be sealed by a normal method such as a boiling water immersion method or a metal salt-containing hot water immersion method. Good.

Next, the exhaust pipe heat radiation system of the present invention will be described.
FIG. 5 is a cross-sectional view schematically showing an example of the exhaust pipe heat dissipation system of the present invention.
An exhaust pipe heat dissipation system 100 shown in FIG. 5 includes an exhaust pipe 101 made of a cylindrical base material 102 made of metal, and a heat receiving member 1 of the present invention disposed at a portion facing the outer peripheral surface of the exhaust pipe 101.
The heat receiving member 1 is arranged with the surface layer 30 on which the surface of the base material 20 is anodized facing the outer peripheral surface of the exhaust pipe 101.
In FIG. 5, heat transferred from the outer peripheral surface of the exhaust pipe 101 toward the surface layer 30 of the heat receiving member 1 is schematically indicated by arrows.

The exhaust pipe 101 is a member that is connected to an internal combustion engine such as an engine and that allows high-temperature exhaust gas to circulate.
Examples of the material of the base material 102 constituting the exhaust pipe 101 include metals such as stainless steel, steel, iron, and copper, and nickel-based alloys such as Inconel, Hastelloy, and Invar. Since these metal materials have high thermal conductivity, they can contribute to improvement in heat dissipation of the exhaust pipe 101.

Moreover, since these metal materials have high heat resistance, they can be suitably used in a high temperature region. Further, by using these metal materials as a base material, the exhaust pipe is excellent in thermal shock resistance, workability, mechanical characteristics, and the like.

The shape of the substrate 102 is not particularly limited as long as it is cylindrical, and the shape of the outer edge of the cross section may be a circle, or any other shape such as an ellipse or a polygon.

The heat receiving member 1 has a high emissivity of the surface layer 30 as described above. Therefore, when the temperature of the exhaust pipe 101 becomes high, a large amount of heat radiated from the outer peripheral surface of the exhaust pipe 101 can be received on the surface of the surface layer 30 of the heat receiving member 1.

The shape of the heat receiving member is not particularly limited as long as it is a shape that can be disposed in a portion facing the outer peripheral surface of the exhaust pipe included in the exhaust pipe heat dissipation system. For example, the heat receiving member of the present invention corresponds to the heat insulator shown in FIG. 1, and the surface layer of the heat receiving member may be a surface facing the outer peripheral surface of the exhaust pipe.

The heat receiving member used in the exhaust pipe heat dissipation system of the present invention is not limited to the heat receiving member 1 shown in FIG. 2, and the heat receiving member of the present invention shown in this specification can be used arbitrarily. .

Below, it enumerates about the effect of the heat receiving member of this embodiment, and an exhaust pipe thermal radiation system.
(1) In the heat receiving member of the present embodiment, a surface layer subjected to an alumite treatment is formed on the surface of a base material made of aluminum or an aluminum alloy. The anodized surface layer has a higher emissivity on the surface than that of aluminum. If the surface layer has a high emissivity, the heat receiving member is disposed with the surface layer facing the heat source such as an exhaust pipe, so that a large amount of heat generated from the heat source is received by radiant heat transfer. be able to. That is, the heat receiving member of this embodiment is excellent in the ability to receive heat from a heat source by radiant heat transfer. And if such a heat receiving member is used, the heat radiation from a heat source can be promoted.

(2) In the heat receiving member of this embodiment, the surface layer may have fine holes, and metal may be deposited in the fine holes. If metal is deposited in the micropores in the surface layer, the emissivity in that region can be further increased.

(3) The exhaust pipe heat dissipation system of the present embodiment includes an exhaust pipe made of a cylindrical base made of metal, and the heat receiving member of the present invention disposed at a portion facing the outer peripheral surface of the exhaust pipe.
Since the heat receiving member of the present invention is a member having a high heat receiving capability by radiant heat transfer, if such a heat receiving member is disposed at a portion facing the outer peripheral surface of the exhaust pipe, the temperature of the exhaust pipe is high. When it becomes higher due to passage, a large amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe can be received by the heat receiving member. Therefore, it is possible to prevent the temperature of the exhaust pipe from rising excessively.

Examples that more specifically disclose the first embodiment of the present invention will be described below, but the present embodiment is not limited to these examples.

Example 1
A plate (150 mm × 70 mm × 0.5 mmt) made of aluminum (A1050) was prepared as a base material, and a masking tape was applied to the surface on which the alumite treatment was not performed for protection. And this board was anodized.
During the alumite treatment, the electrolytic bath was sulfuric acid having a concentration of 200 g / liter, and the electrolysis temperature was 15 ° C. As an electrolysis method, a multi-stage electrolysis method in which a low voltage (20 V) was used in the first half and a high voltage (40 V) was used in the second half was used. Subsequently, it wash | cleaned in order to remove electrolyte solution.
A part of the heat receiving member after the alumite treatment was cut, and the thickness of the surface layer formed by the alumite treatment was measured at 5 points using an SEM, and it was 15 to 20 μm.
Moreover, the micropore was formed in the surface layer.

(Example 2)
Electrolytic coloring treatment was further performed in which nickel was deposited in the micropores in the surface layer of the heat receiving member produced in Example 1.
Nickel sulfate is used as the electrolytic bath, the pH of the electrolytic bath is in the range of 4 to 6, the temperature is in the range of 5 to 30 ° C., the surface layer of the heat receiving member is the cathode, and the carbon rod is used as the anode. Electrolytic treatment was performed using alternating current.
Next, the heat receiving member was immersed in deionized water and boiled for 15 minutes to provide a sealing treatment.

(Examples 3 to 5)
An alumite treatment, an electrolytic coloring treatment, and a sealing treatment were performed in the same manner as in Example 2 except that the thickness of the base material was 1.0, 2.0, or 5.0 mm, respectively, to produce a heat receiving member.

(Comparative Example 1)
About the base material which consists of the same aluminum as Example 1, it was set as the heat receiving member as it was, without performing an alumite process and an electrolytic coloring process.

The following items were evaluated for the heat receiving members produced in each of the examples and comparative examples.
(I) Measurement of emissivity The emissivity of the base material before the anodizing treatment, the emissivity of the surface layer of the heat receiving member after the anodizing treatment, the radiation of the surface layer of the heat receiving member after the electrolytic coloring treatment The rate was measured using an emissometer (manufactured by KEM, AERD wavelength 3 to 30 μm).

(Ii) Measurement of heat receiving effect FIG. 6 is a cross-sectional view schematically showing a method of measuring the heat receiving effect of the heat receiving member.
A heat receiving effect measuring apparatus 200 shown in FIG. 6 includes a heater 201, and the heater 201 is surrounded by a heat insulating material 202. The heater 201 is connected to a power source (not shown) via the power cord 203, and the temperature of the heater 201 can be raised by turning on the power. The upper surface of the heat receiving effect measuring device 200 is open, and the heat receiving member to be measured is placed on the open surface so that the periphery of the heater 201 becomes a sealed space.
In FIG. 6, the length indicated by arrow A is the long side (150 mm) of the heat receiving member, and the length indicated by arrow B is the width of the sealed space (120 mm).

In the measurement of the heat receiving effect, the heat receiving member 1 was placed on the upper surface of the heat receiving effect measuring apparatus 200 with the surface layer 30 of the heat receiving member 1 facing the heater 201, and power was supplied to the heater 201.
And when the temperature of the heater was 500 ° C., the amount of power was adjusted so that the amount of heat released and the amount of input power were balanced, and the amount of power was recorded.
The amount of electric power recorded at this time was defined as the amount of heat received by the heat receiving member.
In addition, since the surface layer was not formed in the heat receiving member of Comparative Example 1, the heat receiving member was placed with the surface of the base material facing the heater.

Moreover, the temperature of 5 points | pieces on a heat receiving member at the time of making the temperature of a heater into 500 degreeC and making it equalize the heat radiation amount and input electric energy was measured.
The measurement points were positions indicated by arrows C, D, E, F, and G, each having a width of 120 mm indicated by arrow B in FIG.
Note that these measurement points are located at the center (35 mm) of the short side (70 mm) of the heat receiving member, and the position E in FIG. 6 corresponds to the center of the heat receiving member.
Then, the maximum value and the minimum value of the measured five temperatures were obtained, and the value of “maximum value−minimum value” was used as an index indicating the variation in temperature distribution.

(Iii) Measurement of thermal strain The change of the position E in FIG. 6 in the measurement test of the heat receiving effect in (ii) was measured with a non-contact displacement meter.

(Iv) Measurement of cutting of base material The heat receiving member produced in each Example and Comparative Example was subjected to 500 cycles of a cooling cycle test in which heating to 250 ° C. and cooling to 25 ° C. by water immersion were repeated, and a cooling cycle test It was visually observed whether or not the subsequent substrate was cut.

Table 1 summarizes the evaluation results of the items (i) to (iv) for the heat receiving members produced in each of the examples and comparative examples.
Table 1 shows the temperature at position E in FIG. In Examples 1 to 5 and Comparative Example 1, the temperature at the position E, that is, the center of the heat receiving member, was the highest.
Regarding the occurrence of cuts, those with slight cuts are indicated by “◯”, and those with large cuts are indicated by “x”.

When Example 1 and Comparative Example 1 were compared, the emissivity of the surface layer subjected to the alumite treatment was significantly higher than the emissivity of the base material not subjected to the alumite treatment. The heat receiving member of Example 1 had a larger amount of heat reception than the heat receiving member of Comparative Example 1.
Since the amount of electric power measured as the amount of heat received is equal to the amount of heat released from the heater, which is a heat source, it is possible to promote heat dissipation from the heat source by using a heat receiving member having a high emissivity as in the first embodiment. all right.

Further, when the electrolytic coloring treatment is performed as in Example 2, the emissivity of the heat receiving member can be further increased, and in this case, the amount of heat received can be further increased.

By comparing Example 2 with Examples 3-5, the effect of the thickness of the substrate was examined. In any of the examples, the emissivity of the surface on which the surface layer of the heat receiving member was formed was 0.814.
The maximum temperature was observed at position E in any of the examples, and when the thickness of the base material was 2.0 mm or 5.0 mm, the maximum temperature was lowered as the thickness increased. In addition, when the thickness of the base material was 2.0 mm or 5.0 mm, the temperature difference between the maximum temperature and the minimum temperature was reduced with the increase in thickness.
The reason why the temperature difference decreases as the substrate thickness increases is not clear, but if the substrate thickness is thick, the amount of heat transmitted through the substrate increases due to heat conduction inside the substrate. This is presumably because the temperature inside the member tends to be uniform.

Further, the amount of distortion of the heat receiving member decreased as the thickness of the base material increased. This is presumed to be because if the thickness of the base material is large, the strength of the base material increases, so that the base material is less likely to be deformed by thermal stress.

Regarding the breakage of the substrate, the occurrence of breakage was slightly observed in Examples 1 to 5.
In Comparative Example 1, the substrate was severely cut. The reason why the base material is severely cut is presumed to be that the heat resistance of the base material made of aluminum that has not been anodized is lower than the base material made of aluminum that has been anodized.

(Second embodiment)
Next, a second embodiment, which is an embodiment of the heat receiving member of the present invention, will be described with reference to the drawings.
In the heat receiving member of the second embodiment, the emissivity of the region away from the high temperature portion of the heat source is higher than the emissivity of other regions.
FIG. 7 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 4 shown in FIG. 7, the surface layer 30 is formed by alumite treatment on the surface of the substrate 20, and the surface layer 30 has a large number of fine holes 40.
In some areas of the surface layer 30, electrolytic coloring treatment is performed and metal is deposited in the fine holes 40, and in other areas of the surface layer 30, no electrolytic coloring treatment is performed and metal is present in the fine holes 40. Not deposited.

In the heat receiving member 4, a region where the electrolytic coloring treatment is performed is a region having a higher emissivity than the other regions, and a region where the electrolytic coloring treatment is not performed is a region having a lower emissivity than the other regions.

As a method of manufacturing the heat receiving member 4, after performing the alumite treatment and forming the surface layer in the same manner as the method of manufacturing the heat receiving member of the first embodiment, a masking treatment is performed on a region where the electrolytic coloring treatment is not performed. The method of performing electrolytic coloring treatment is mentioned.
The masking process can be performed by a method such as attaching a masking tape.
By doing in this way, the area | region which did not perform a masking process can be made into a high emissivity area | region, and the area | region which performed the masking process can be made into a low emissivity area | region.

FIG. 8 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 5 shown in FIG. 8, a surface layer 30 is formed on a part of the base material 20 by alumite treatment. On the other hand, a part of the base material 20 is not anodized and the surface of the base material 20 is exposed.

In the heat receiving member 5, the region in which the surface layer 30 is formed by the alumite treatment has a higher emissivity than the other regions. On the other hand, the region where the surface of the substrate 20 is exposed is a region having a lower emissivity than the other regions. The area | region where the base-material surface was exposed is arrange | positioned in the position close to the high temperature part of a heat source.

Examples of the method for manufacturing the heat receiving member 5 include a method in which, in the step of manufacturing the heat receiving member of the first embodiment, a masking process is performed on a region where the alumite process is not performed, and then an alumite process is performed.
The masking process can be performed by a method such as attaching a masking tape.
By doing in this way, the area | region which did not perform a masking process can be made into a high emissivity area | region, and the area | region which performed the masking process can be made into a low emissivity area | region.

FIG. 9 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 6 shown in FIG. 9, a surface layer 30 is formed on a part of the base material 20 by alumite treatment. Further, the surface layer 30 is subjected to electrolytic coloring treatment, and metal is deposited in the fine holes 40. On the other hand, a part of the base material 20 is not anodized and the surface of the base material 20 is exposed.

In the heat receiving member 6, the region where the alumite treatment and the electrolytic coloring treatment are performed is a region having a higher emissivity than the other regions. On the other hand, the region where the surface of the substrate 20 is exposed is a region having a lower emissivity than the other regions.
In the heat receiving member 6, the difference in emissivity between the high emissivity region and the low emissivity region is larger than that of the heat receiving member 4 and the heat receiving member 5.

As a method for manufacturing the heat receiving member 6, there is a method in which a masking process is performed on a region where the alumite treatment is not performed, alumite treatment is performed, and micropore formation and electrolytic coloring treatment are performed while masking the region is maintained. It is done.
Specifically, after the heat receiving member 5 is manufactured, the heat receiving member 6 can be manufactured by further performing alumite treatment to form micropores in the surface layer and further performing electrolytic coloring treatment.

In the heat receiving member of the second embodiment, the size of the region having a lower emissivity than other regions is preferably 5 to 95% of the entire surface area.
In addition, the size of the region having a lower emissivity than the other regions is desirably larger than 10 mm × 10 mm when the shape is a rectangular shape.
Moreover, it is desirable that the difference in emissivity between the high emissivity region and the low emissivity region is 0.01 to 0.90.
The ratio (Y / X) of the length (Y) of the short side of the region having a lower emissivity than the other regions to the thickness (X) of the base material is desirably 2 or more.

Below, it enumerates about the effect of the heat receiving member of this embodiment.
In the present embodiment, the effects (1) and (2) described in the first embodiment can be exhibited, and the following effects can be exhibited.
(4) In the heat receiving member of the present embodiment, there is a region having a higher emissivity than other regions. A region having a higher emissivity than other regions is a region where heat generated by radiant heat transfer is easily received, and thus the amount of heat received per unit area increases. And the area | region with a high emissivity becomes an area | region where the temperature rise by heat receiving tends to produce. Therefore, by arranging a region having a higher emissivity than the other regions at a position away from the high temperature portion of the adjacent heat source, the temperature of the heat receiving member is likely to rise even in a region away from the high temperature portion of the heat source. It is possible to prevent a region having a low temperature from being generated inside the heat receiving member.
That is, the occurrence of a temperature difference inside the heat receiving member can be prevented. And it can prevent that a thermal stress is added to a heat receiving member, and distortion generate | occur | produces in a heat receiving member.

(5) In the heat receiving member of the present embodiment, fine holes are formed in the surface layer in the region away from the high temperature portion of the heat source, and metal may be deposited in the fine holes.
If metal is deposited in the micropores in the surface layer, the emissivity in that region can be further increased. That is, by arranging the region where the metal is deposited in the micropores formed in the surface layer at a position away from the high temperature part of the heat source, it is possible to more effectively prevent a region having a low temperature inside the heat receiving member. can do.

(6) In the heat receiving member of the present embodiment, a region where the base material surface is not anodized and the base material surface is exposed may exist in a region close to the high temperature portion of the heat source.
Since the substrate is made of aluminum or an aluminum alloy, the emissivity of the region where the surface of the substrate is exposed is low. By arranging the region where the substrate surface of the heat receiving member is exposed at a position close to the high temperature portion of the heat source, the temperature of the heat receiving member is prevented from excessively rising even in the region close to the high temperature portion of the heat source, It can prevent that the area | region where temperature is high arises in a heat receiving member. That is, the occurrence of a temperature difference inside the heat receiving member can be prevented.

Hereinafter, examples more specifically disclosing the second embodiment of the present invention will be shown, but the present embodiment is not limited to these examples.
(Example 6)
In the same manner as in Example 1, an alumite treatment was performed on a base material made of aluminum to form a surface layer on the base material and to form micropores in the surface layer.
Next, a masking tape having a size of 20 mm × 20 mm (manufactured by Sumitomo 3M, 851T) was affixed to the center (position E in FIG. 6) on which the alumite treatment was performed.
Subsequently, electrolytic coloring treatment was performed in the same manner as in Example 2, and nickel was deposited in the fine holes in the region where the masking tape was not applied.
Thereafter, the masking tape was peeled off, and sealing treatment was performed in the same manner as in Example 2.
In the heat receiving member manufactured in this way, the region where the electrolytic coloring treatment is not performed is the “region having a lower emissivity than the other regions”, and the region where the electrolytic coloring treatment is performed is “the radiation is less than the other regions”. It is an area where the rate is high.

(Example 7)
A masking tape of the same type as that used in Example 6 and having a size of 10 mm × 10 mm was affixed to the center (position E in FIG. 6) of the surface on which the alumite treatment of the substrate used in Example 1 was performed.
Next, an alumite treatment was performed in the same manner as in Example 1 to form an alumite-treated surface layer in a region where the masking tape was not applied, and fine pores were further formed in the surface layer.
Subsequently, electrolytic coloring treatment was performed in the same manner as in Example 2 with the masking tape applied, and nickel was deposited in the micropores in the region where the masking tape was not applied.
Thereafter, the masking tape was peeled off, and sealing treatment was performed in the same manner as in Example 2.
In the heat receiving member thus manufactured, the region where the alumite treatment and the electrolytic coloring treatment are not performed becomes a “region having a lower emissivity than other regions”, and the region where the alumite treatment and the electrolytic coloring treatment are performed is “ This is a region having a higher emissivity than other regions.

(Examples 8 and 9)
A heat receiving member was produced in the same manner as in Example 7 except that the size of the masking tape was 20 mm × 20 mm and 50 mm × 50 mm, respectively.

(Examples 10 to 12)
A heat receiving member was produced in the same manner as in Example 7 except that the thickness of the base material was 1.0 mm and the size of the masking tape was 10 mm × 10 mm, 20 mm × 20 mm, or 50 mm × 50 mm, respectively.

(Examples 13 to 15)
A heat receiving member was produced in the same manner as in Example 7 except that the thickness of the base material was 2.0 mm and the size of the masking tape was 10 mm × 10 mm, 20 mm × 20 mm, or 50 mm × 50 mm, respectively.

(Examples 16 to 18)
A heat receiving member was produced in the same manner as in Example 7 except that the thickness of the base material was 5.0 mm and the size of the masking tape was 10 mm × 10 mm, 20 mm × 20 mm, or 50 mm × 50 mm, respectively.

The same items (i) to (iv) as in Example 1 were evaluated for the heat receiving member produced in each Example.

First, Table 2 summarizes the evaluation results of Examples 6 to 9 in which the substrate thickness is 0.5 mm. For comparison, the results of Example 2 in which the emissivity of the surface of the heat receiving member is uniform are also shown.

In Table 2, the emissivity of the region where the emissivity is low in each example is shown. In Example 6 in which the alumite treatment is performed and the electrolytic coloring treatment is not performed, the emissivity is 0.780. In Examples 7 to 9 where the alumite treatment and the electrolytic coloring treatment are not performed, the emissivity is 0.050 which is the emissivity of the base material.
In addition, although the emissivity of the area | region with a high emissivity and the emissivity of Example 2 are not shown in Table 2, since it corresponds to the area | region where the alumite process and the electrolytic coloring process are performed, the emissivity of those areas Are both 0.814.

In Example 2 where the emissivity of the surface of the heat receiving member is uniform, the temperature at position E in FIG. 6, that is, the center of the heat receiving member, is the highest in the heat receiving member, which is 452 ° C.
On the other hand, in Examples 6-9, since the area | region with a low emissivity was provided in the position E, the temperature of the position E fell compared with Example 2. FIG. The temperature decreased in comparison with Example 2 is shown in Table 2 as “temperature decrease at position E”.

Table 3 shows temperature data measured at positions C, D, E, F, and G in FIG. 6 for Example 2 and Examples 6 to 9. Moreover, the relationship between the temperature of the heat receiving member measured in Example 2 and Examples 6 to 9 and the temperature measurement position is shown in FIG.

Hereinafter, an evaluation result is demonstrated with reference to Table 2, Table 3, and FIG.
In Example 6, the emissivity in the low emissivity region is 0.780, and the emissivity difference from the emissivity 0.814 in the high emissivity region is 0.034. Thus, by providing a region having a higher emissivity and a region having a lower emissivity than the other regions, the temperature at the position E decreases by 28 ° C., and the temperature difference between the maximum temperature and the minimum temperature becomes 6 ° C. It was possible to make the temperature distribution close to uniform.

In Example 8, the emissivity of the region where the emissivity is low is 0.05, and the temperature drop at the position E is as large as 73 ° C. Compared with Example 6 in which the area of the low emissivity area is the same at 20 mm × 20 mm, it can be seen that the effect of the temperature decrease becomes greater when the emissivity of the low emissivity area is low.

A comparison is made between Examples 7, 8, and 9 where the emissivity of the low emissivity region is the same at 0.05 and the area of the low emissivity region is different. It can be seen that the decrease in temperature is greater.
Further, in Examples 8 and 9 where the temperature drop was large, the temperature at position E was the lowest in the heat receiving member, and the waveform of the line graph in FIG. 10 was opposite to that in Example 2.

From these results, by providing the heat receiving member with a high emissivity region and a low emissivity region, the temperature of a specific region in the heat receiving member becomes too high, and the temperature of the specific region becomes too low. It was found that the temperature distribution in the heat receiving member can be adjusted by appropriately adjusting the emissivity and size of the high emissivity region and the low emissivity region.

Next, Examples 10-12 where the substrate thickness is 1.0 mm, Examples 13-15 where the substrate thickness is 2.0 mm, Examples 16-18 where the substrate thickness is 5.0 mm The evaluation results are shown in Table 4, 5 or 6 collectively.
For comparison, the results of Examples 3, 4 and 5 in which the emissivity of the surface of the heat receiving member is uniform are also shown, and “temperature drop at position E” is the position in Examples 3, 4 and 5, respectively. Calculation was performed based on the temperature of E.

From the results shown in Table 3 and the results shown in Tables 4 to 6, the influence of the thickness of the base material on the characteristics of the heat receiving member was considered.
Comparing between Examples having the same base material thickness, the temperature decrease at the position E was larger as the size of the region having a lower emissivity was larger.

When comparing the results of the examples in which the thickness of the base material was changed for the examples in which the size of the region having a low emissivity was the same, the temperature decrease tended to decrease as the thickness of the base material increased.
The reason for this is not clear, but it is presumed that if the thickness of the base material is large, the amount of heat transmitted through the base material increases due to the heat conduction inside the base material, so that the influence of the emissivity is reduced. Is done.

Moreover, the tendency for the amount of distortion to become small was seen when the thickness of the base material became thick. A possible reason for this is that the mechanical strength of the base material is improved as the thickness of the base material increases.

From these results, the temperature distribution in the heat receiving member can be adjusted by appropriately adjusting the emissivity and size of the high emissivity region and the low emissivity region according to the thickness of the substrate. all right.

(Third embodiment)
Next, a third embodiment, which is an embodiment of the heat receiving member of the present invention, will be described with reference to the drawings.
In the heat receiving member of the third embodiment, a plurality of cracks are formed in the surface layer.
FIG. 11 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 7 shown in FIG. 11, a surface layer 30 is formed by alumite treatment on the surface of the base material 20, and a plurality of cracks 60 are formed in the surface layer 30.
It can be said that the crack 60 is a crack generated in the surface layer 30.

FIGS. 12, 13, and 14 are electron micrographs of the surface layer of an example of the heat receiving member of the present invention having a crack in the surface layer.
In the surface layer shown in FIG. 12, the crack 61 is bent as shown in the region surrounded by the curve.
In the surface layer shown in FIG. 13, as shown in a region surrounded by a curve, at least one end of the crack 62 is stopped in the middle without being connected to another crack, and the cracks are independent from each other.
In the surface layer shown in FIG. 14, as indicated by an arrow, the crack 63 is a group of straight lines substantially parallel to one direction.

The width of the crack is desirably 0.01 to 15 μm.
When the interval is larger than 15 μm, the substrate may be cut.

As a method for forming a crack in the surface layer, there is a method in which a bending distortion is applied to the heat receiving member after the anodizing treatment and the bending process is performed again so as to return to the original shape.

Below, it enumerates about the effect of the heat receiving member of this embodiment.
In the present embodiment, the effects (1) and (2) described in the first embodiment can be exhibited, and the following effects can be exhibited.
(7) In the heat receiving member of this embodiment, since a plurality of cracks are formed in the surface layer, part of the thermal stress applied between the base material and the surface layer is absorbed by the crack portion, and the base material and the surface layer It is possible to prevent the thermal stress applied during the period from increasing. As a result, it is possible to prevent the substrate from being cut by thermal stress.

(8) In the heat receiving member of this embodiment, the cracks may be independent of each other.
If the cracks are independent of each other, when the thermal stress is applied to the surface layer, the thermal stress is absorbed by the development of the crack. Can do. Further, since the surface layer is continuous, the rigidity is increased and the shape is easily maintained.

(9) In the heat receiving member of this embodiment, the crack may be bent.
When the crack is bent, a resistance force is generated with respect to a force applied in a direction parallel to the crack, so that the base material can be more effectively prevented from being cut.

Hereinafter, examples more specifically disclosing the third embodiment of the present invention will be shown, but the present embodiment is not limited to only these examples.
(Example 19)
A heat receiving member was produced in the same manner as in Example 2. Thereafter, the produced heat receiving member was bent by hand to add strain. It was confirmed that cracks occurred in the surface layer due to the strain, that is, cracks occurred.
The crack had a bent shape, and the width of the crack measured at 5 locations using SEM was 0.01 to 15 μm.

The same items (i) to (iv) as in Example 1 were evaluated for the heat-receiving member produced in Example 19. The results are summarized in Table 7. For comparison, the results of Example 2 in which no cracks are formed in the surface layer of the heat receiving member are also shown.

The emissivity of the heat receiving member produced in Example 19 was slightly lower than that in Example 2. This is considered to be because the substrate surface of the crack portion is included in the emissivity measurement region.
In the heat-receiving member produced in Example 19, no breakage of the substrate was observed due to the presence of cracks. In Table 7, this result is shown as “◎”.

(Fourth embodiment)
Next, a fourth embodiment, which is an embodiment of the heat receiving member of the present invention, will be described with reference to the drawings.
In the heat receiving member of the fourth embodiment, a surface layer that is anodized is formed on both surfaces of the base material.
FIG. 15 is a cross-sectional view schematically showing an example of the heat receiving member of the present invention.
In the heat receiving member 11 shown in FIG. 15, both surfaces of the base material 20 are anodized, and a surface layer 30a is formed on the upper surface, and a surface layer 30b is formed on the lower surface.
A fine hole 40a and a fine hole 40b are formed in the surface layer 30a and the surface layer 30b, respectively, and a metal 50a and a metal 50b are deposited in the fine hole, respectively.
That is, the configuration of only one side of the heat receiving member is the same as that of the heat receiving member shown in FIG.

The heat receiving member shown in FIG. 15 is an example of the heat receiving member of the present embodiment, and any of the heat receiving member surface layers described so far can be adopted as the surface layer of the heat receiving member of the present embodiment.
Further, the state of the surface layer may be different between the upper surface and the lower surface. For example, the upper surface layer is subjected to metal coloring treatment, and the lower surface layer is not subjected to metal coloring treatment.

As a method of forming the alumite-treated surface layer on both sides of the substrate, the substrate is not masked, and when the substrate is immersed in the electrolytic bath, both sides of the substrate are in contact with the electrolytic bath. Etc. Moreover, you may perform alumite processing one side at a time.

Below, it enumerates about the effect of the heat receiving member of this embodiment.
In the present embodiment, the effects (1) to (9) described in the first to third embodiments can be exhibited on each surface by changing the configuration of the surface layer, and the following effects are exhibited. be able to.
(10) In the heat receiving member of this embodiment, the surface layer by which alumite processing was carried out is formed in both surfaces of the heat receiving member, and the emissivity of both surfaces of a heat receiving member becomes high. Then, a large amount of heat can be received on one surface and a large amount of heat can be radiated from the other surface. Therefore, it becomes difficult for the temperature of the heat receiving member to rise, and the thermal stress applied to the heat receiving member can be reduced.
In addition, since the amount of heat that can be received by the heat receiving member increases as the temperature of the heat receiving member decreases, the temperature of the heat receiving member does not easily rise even when receiving heat, thereby further increasing the heat receiving capability by radiant heat transfer. It can be set as a high heat receiving member.

Hereinafter, examples that more specifically disclose the fourth embodiment of the present invention will be described. However, the present embodiment is not limited to these examples.
(Example 20)
The same base material as used in Example 1 was immersed in an electrolytic bath without a masking tape, and an alumite treatment was performed on both surfaces of the base material to form surface layers on both surfaces of the base material. Then, further fine holes were formed in the surface layer.
Other conditions for the alumite treatment were the same as in Example 1.

Next, when the heat receiving member was used, a masking tape was applied to the surface layer on the side to be the heat radiating surface to protect it, and nickel was deposited in the fine holes by performing electrolytic coloring treatment in the same manner as in Example 2. .
Thereafter, the masking tape was peeled off, and sealing treatment was performed in the same manner as in Example 2.
In the heat receiving member thus manufactured, one surface is a surface on which an alumite treatment and an electrolytic coloring treatment are performed, and the opposite surface is a surface on which only an alumite treatment is performed.

(Example 21)
A heat receiving member was produced in the same manner as in Example 20 except that the masking tape was not attached to the surface layer before the electrolytic coloring treatment in Example 20.
In the heat-receiving member thus produced, both surfaces are surfaces on which an alumite treatment and an electrolytic coloring treatment have been performed.

The same items (i) to (iv) as in Example 1 were evaluated for the heat receiving members produced in Examples 20 and 21. In Example 20, the surface on which the alumite treatment and the electrolytic coloring treatment were performed was used as the heat receiving surface toward the heater side. And the surface on which only the alumite treatment was performed was used as the heat radiating surface on the opposite side. In Example 21, the direction of the front and back of the heat receiving member was arbitrary.
Moreover, the following Example 22 and Example 23 were performed.

(Example 22)
In Example 22, when the heat receiving effect was measured, the same heat receiving member as that produced in Example 20 was used, and in Example 20, the surface on which only the alumite treatment was performed with the front and back sides of the heat receiving member reversed was received. The surface on which the alumite treatment and the electrolytic coloring treatment were performed was defined as the heat dissipation surface.

(Example 23)
In Example 23, when the heat receiving effect was measured, the same heat receiving member as that produced in Example 2 was used, and in Example 2, the surface layer of the heat receiving member was opposite to the heater with the front and back sides of the heat receiving member reversed. The heat-dissipating surface was disposed on the surface, and the surface that was not anodized was used as the heat-receiving surface.
The evaluation results of Examples 20 to 23 are shown together in Table 8. For comparison, the results of Example 2 are also shown.

In Examples 20 to 22, since the emissivities on the heat receiving surface side and the heat radiating surface side of the heat receiving member are both high, the amount of heat received exceeds 8700 W / m ² . This amount of heat received is very large compared to the result of Example 2 where the emissivity only on the heat receiving surface side is high.
That is, in Examples 20 to 22, it can be seen that the amount of heat received by the heat receiving member is considerably improved because of the large amount of heat released to the outside due to radiative heat transfer from the heat radiating surface side.
Further, it can be seen that the maximum temperature of the heat receiving member is low despite the large amount of heat received, and heat dissipation from the heat receiving member is promoted.
In Example 23 where the emissivity only on the heat radiating surface side was high and the emissivity of the heat receiving surface was low, the amount of heat received was small.
From the above results, it is possible to provide a heat receiving member with extremely high heat receiving capability by radiant heat transfer by providing alumite-treated surface layers on both sides of the heat receiving member and increasing the emissivity of both the heat receiving surface and the heat radiating surface. all right.

(Fifth embodiment)
Next, a fifth embodiment, which is an embodiment of the exhaust pipe heat dissipation system of the present invention, will be described with reference to the drawings.
In the exhaust pipe heat dissipation system of the present embodiment, a surface coating layer made of a crystalline inorganic material and an amorphous binder is formed on the outer peripheral surface of the exhaust pipe described in the exhaust pipe heat dissipation system of the first embodiment. .

FIG. 16 is a cross-sectional view schematically showing an example of the exhaust pipe heat dissipation system of the present invention.
In the exhaust pipe 151 constituting the exhaust pipe heat dissipation system 150 shown in FIG. 16, a surface coating layer 103 made of a crystalline inorganic material and an amorphous binder is formed on the outer peripheral surface of a cylindrical base material 102 made of metal. Being done.
The surface layer 30 of the heat receiving member 1 that has been anodized is disposed so as to face the surface coating layer 103 of the exhaust pipe 151.
In FIG. 16, heat transferred from the surface coating layer 103 formed on the outer peripheral surface of the exhaust pipe 151 toward the surface layer 30 of the heat receiving member 1 is schematically indicated by arrows.

The surface coating layer 103 has an emissivity of 0.78 or more at a wavelength of 3 to 30 μm. By providing the surface coating layer 103 with high emissivity on the outer peripheral surface of the exhaust pipe 151, the heat inside the exhaust pipe 151 can be effectively radiated to the outside of the exhaust pipe 151 by radiant heat transfer.

The material of the crystalline inorganic material constituting the surface coating layer 103 is not particularly limited, but it is desirable to use an oxide of a transition metal, and specific examples include, for example, manganese dioxide, manganese oxide, iron oxide , Cobalt oxide, copper oxide, chromium oxide, nickel oxide and the like. These may be used alone or in combination of two or more.
These transition metal oxides are suitable for the production of crystalline inorganic materials having high emissivity.

Examples of the amorphous binder include barium glass, boron glass, strontium glass, alumina silicate glass, soda zinc glass, and soda barium glass. These may be used alone or in combination of two or more.

Since such an amorphous binder is a low melting point glass and has a softening temperature in the range of 400 to 1100 ° C., it is melted and coated on the outer peripheral surface of the base material of the exhaust pipe, and then subjected to a heating and baking treatment. Thus, the surface coating layer can be easily and firmly formed on the outer peripheral surface of the base material of the exhaust pipe.

When the amorphous binder is a low-melting glass, the melting point is desirably 400 to 1100 ° C.
If the melting point of the low melting point glass is less than 400 ° C., it can be easily softened during use and cause adhesion and migration of foreign matters. On the other hand, if the melting point exceeds 1100 ° C., a surface coating layer is formed. This is because the base material of the exhaust pipe may be deteriorated by the heat treatment.

When the surface coating layer is composed of the crystalline inorganic material and the amorphous binder, a desirable lower limit is 10% by weight and a desirable upper limit is 90% by weight.
When the blending amount of the crystalline inorganic material is less than 10% by weight, the infrared emissivity may be insufficient and heat dissipation may be reduced. On the other hand, when the blending ratio exceeds 90% by weight, the exhaust pipe This is because the adhesiveness to the substrate may be reduced.
As for the compounding quantity of the said crystalline inorganic material, a more desirable minimum is 30 weight% and a more desirable upper limit is 70 weight%.

The thickness of the surface coating layer is preferably 0.5 to 10 μm.
If the thickness of the surface coating layer is less than 0.5 μm, sufficient heat dissipation may not be ensured. On the other hand, if the thickness of the surface coating layer exceeds 5 μm, cracks are generated in the surface coating layer. Or the exhaust pipe may be deformed.

The surface coating layer is preferably formed on the entire outer peripheral surface of the exhaust pipe. This is because the surface coating layer has the largest area and is particularly excellent in heat dissipation. However, the surface covering layer may be formed only on a part of the outer peripheral surface of the exhaust pipe, and particularly if it is formed on the surface facing the heat receiving member, it may not be formed on other parts. good.

Hereinafter, a method for manufacturing an exhaust pipe used in the exhaust pipe heat dissipation system of the present embodiment will be described in the order of steps.

(I) Using a cylindrical exhaust pipe processed into a predetermined shape as a starting material, first, a cleaning process is performed to remove impurities on the surface of the base material of the exhaust pipe.
The cleaning process is not particularly limited, and a conventionally known cleaning process can be used. Specifically, for example, a method of performing ultrasonic cleaning in an alcohol solvent can be used.

In addition, after the cleaning treatment, the exhaust gas is exhausted to increase the specific surface area of the outer peripheral surface of the base material of the exhaust pipe or to adjust the maximum height Rz of the inner peripheral surface of the base material of the exhaust pipe as necessary. You may roughen the surface of the base material of a pipe | tube. Specifically, for example, a roughening process such as a sandblast process, an etching process, or a high temperature oxidation process may be performed. These may be used alone or in combination of two or more.

(II) Separately, a crystalline inorganic material and an amorphous binder are wet mixed to prepare a surface coating layer raw material composition.
Specifically, the powder of the crystalline inorganic material and the powder of the amorphous binder are prepared so as to have a predetermined particle size, shape, etc., and each powder is dry-mixed at a predetermined blending ratio and mixed powder A surface coating layer raw material composition is prepared by adding water and wet mixing with a ball mill.
Here, the mixing ratio of the mixed powder and water is not particularly limited, but is preferably about 100 parts by weight of water with respect to 100 parts by weight of the mixed powder. This is because the viscosity is suitable for application to the base material of the exhaust pipe. Moreover, you may mix | blend an inorganic fiber and an organic solvent with the said raw material composition for surface coating layers as needed.

(III) The outer surface of the base material of the exhaust pipe is coated with the raw material composition for the surface coating layer.
Examples of the method for coating the raw material composition for the surface coating layer include spray coating, electrostatic coating, inkjet, transfer using a stamp or roller, and brushing.
Moreover, you may coat the said raw material composition for surface coating layers by immersing the base material of the said exhaust pipe in the said raw material composition for surface coating layers.

Prior to the treatment of coating the outer peripheral surface of the exhaust pipe base material with the surface coating layer raw material composition, the outer peripheral surface of the exhaust pipe base material is subjected to a plating treatment such as nickel plating and chrome plating, and / or You may perform the oxidation process etc. of the outer peripheral surface of the base material of an exhaust pipe.
This is because the adhesion between the base material of the exhaust pipe and the surface coating layer may be improved.

(IV) The exhaust pipe coated with the raw material composition for the surface coating layer is fired.
Specifically, the exhaust pipe coated with the surface coating layer raw material composition is dried and then heated and fired to form the surface coating layer.
Here, it is desirable that the firing temperature be equal to or higher than the melting point of the amorphous binder, and it is preferably about 700 ° C. to 1100 ° C., although it depends on the type of the blended amorphous binder. By setting the firing temperature to a temperature equal to or higher than the melting point of the amorphous binder, the base material of the exhaust pipe and the amorphous binder can be firmly adhered, and a surface coating layer that is firmly adhered to the substrate is formed. Because it can be done.
Through such a process, an exhaust pipe used in the exhaust pipe heat dissipation system of the present embodiment can be manufactured.

Below, it enumerates about the effect of the exhaust pipe thermal radiation system of this embodiment.
In the exhaust pipe heat dissipation system of the present embodiment, the effect (3) described in the first embodiment can be exhibited, and the following effects can be exhibited.
(11) In the exhaust pipe heat dissipation system of the present embodiment, a surface coating layer made of a crystalline inorganic material and an amorphous binder is provided on the outer peripheral surface of the exhaust pipe base.
When a surface coating layer made of a crystalline inorganic material and an amorphous binder is provided, the emissivity of the outer peripheral surface of the exhaust pipe is increased, so that the amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe is increased. And the radiant heat transfer from the outer peripheral surface of an exhaust pipe is received by the heat receiving member of this invention with high heat receiving capability.
That is, since the improvement in the amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe and the improvement in the amount of heat received by the heat receiving member are combined, it is possible to more effectively prevent the temperature of the exhaust pipe from rising excessively. Can do.

(12) In the exhaust pipe heat dissipation system of the present embodiment, the emissivity of the exhaust pipe (emissivity of the surface coating layer) is 0.78 or more. If the emissivity of the exhaust pipe is in such a range, the amount of radiant heat transfer from the outer peripheral surface of the exhaust pipe is improved, so that it is possible to more effectively prevent the temperature of the exhaust pipe from rising excessively.

(Other embodiments)
When the heat receiving member of the present invention is used as a heat receiving member for receiving heat from the exhaust manifold of the engine, the heat receiving member may be arranged as a member different from the heat insulator.
FIG. 17 is an exploded perspective view schematically showing an example in which the heat receiving member of the present invention is arranged as a member different from the heat insulator.
In FIG. 17, the heat receiving member 1 of the present invention is disposed between the exhaust manifold 111 and the heat insulator 118, and the surface layer 30 of the heat receiving member 1 is disposed on the exhaust manifold 111 side.
Even if the heat receiving member is arranged in this way, the cooling performance of the exhaust manifold can be improved.

FIG. 1 is an exploded perspective view schematically showing the vicinity of an automobile engine and an exhaust pipe connected to the automobile engine. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is sectional drawing which shows typically an example of the exhaust pipe thermal radiation system of this invention. It is sectional drawing which shows typically the method of measuring the heat receiving effect of a heat receiving member. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is a figure which shows the relationship between the temperature of a heat receiving member measured in Example 2 and Examples 6-9, and a temperature measurement position. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is the electron micrograph which image | photographed the surface of the surface layer about an example of the heat receiving member of this invention which has a crack in a surface layer. It is the electron micrograph which image | photographed the surface of the surface layer about an example of the heat receiving member of this invention which has a crack in a surface layer. It is the electron micrograph which image | photographed the surface of the surface layer about an example of the heat receiving member of this invention which has a crack in a surface layer. It is sectional drawing which shows typically an example of the heat receiving member of this invention. It is sectional drawing which shows typically an example of the exhaust pipe thermal radiation system of this invention. It is a disassembled perspective view which shows typically the example in case the heat receiving member of this invention is arrange | positioned as a member different from a heat insulator.

Explanation of symbols

1-11 heat receiving member 20 base material (base material of heat receiving member)
30, 30a, 30b Surface layer 40, 40a, 40b Fine hole 50, 50a, 50b Metal 60, 61, 62, 63 Crack 100, 150 Exhaust pipe heat dissipation system 101, 151 Exhaust pipe 102 Base material (exhaust pipe base material)
103 Surface coating layer 110 Engine 111 Exhaust manifold (exhaust pipe), Exhaust manifold 118 Heat insulator

Claims (11)

A heat receiving member that receives heat energy emitted from a heat source,
A heat-receiving member comprising a base material made of aluminum or an aluminum alloy and a surface layer on which the base material surface is anodized. The heat receiving member according to claim 1, wherein an emissivity of a region away from a high temperature portion of the heat source is higher than an emissivity of another region. The heat receiving member according to claim 2, wherein fine holes are formed in the surface layer in the region away from a high temperature portion of a heat source, and metal is deposited in the fine holes. The heat receiving member according to claim 2, wherein a region of the heat source adjacent to the high temperature portion includes a region where the substrate surface is not anodized and the substrate surface is exposed. The heat receiving member according to claim 1, wherein a plurality of cracks are formed in the surface layer. The heat receiving member according to claim 5, wherein the cracks are independent of each other. The heat receiving member according to claim 5, wherein the crack is bent. The heat-receiving member according to any one of claims 1 to 7, wherein the surface layer is formed on both surfaces of the base material. An exhaust pipe made of a cylindrical base material made of metal;
A heat receiving member disposed in a portion facing the outer peripheral surface of the exhaust pipe,
The exhaust pipe heat radiation system, wherein the heat receiving member is the heat receiving member according to any one of claims 1 to 8. The exhaust pipe heat dissipation system according to claim 9, wherein a surface coating layer made of a crystalline inorganic material and an amorphous binder is provided on an outer peripheral surface of the base material of the exhaust pipe. The exhaust pipe heat dissipation system according to claim 10, wherein the emissivity of the exhaust pipe is 0.78 or more.

Images