JPH0549731B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a composite material, and more particularly to a method for manufacturing a metal matrix composite material using short fibers as a reinforcing material and aluminum alloy or the like as a matrix metal. Prior Art As a method for manufacturing a metal matrix composite material, Japanese Patent Application No. 108165/1986 filed by the same applicant as the applicant of the present application has been disclosed.
In the publication, a molded body containing a reinforcing material and fine pieces of a specific metal is formed, at least a part of the molded body is brought into contact with a molten metal of a matrix metal, and the molded body is formed without substantially pressurizing the molten metal. A method has already been proposed for infiltrating the inside of the body. According to the proposed method, the molten matrix metal penetrates into the compact along the fine pieces of the specific metal, and the heat generated by the reaction between the specific metal and the matrix metal improves the permeability and strengthens the matrix metal. Since the wettability of the matrix metal is improved and a good composite is achieved, the composite material can be efficiently and inexpensively produced without pressurizing the molten matrix metal. Problems to be Solved by the Invention However, in this method, depending on the manufacturing conditions of the composite material, the temperature of the molten metal of the matrix metal is relatively low, and the time during which the molded body is immersed in the molten metal is relatively short. If it is short, micropores may occur in the composite material. For example, SiC with a volume fraction of 5%
Particles (average particle size 10 μm), Al alloy powder (Al-12%Si, average particle size 40 μm) with a volume ratio of 30%, and volume ratio
A composite material was produced by immersing a compact made of 30% pure Cu powder (average particle size 30 μm) in molten Al alloy (JIS standard AC8A) at 575°C for 15 seconds.
When the cross section was observed using an optical microscope, it was found that a small number of micropores were generated mainly due to insufficient impregnation with the molten Al alloy. In view of the above-mentioned problems in the method according to the above-mentioned previous proposal, the present invention has been made by setting the temperature of the molten metal of the matrix metal to a relatively low value and setting the time during which the molded body is immersed in the molten metal to be relatively short. The object of the present invention is to provide a method that can produce a good composite material without producing micropores even if the material is mixed. Means for Solving the Problems According to the present invention, the above-mentioned object is achieved by achieving a volume ratio of 60
~80% Al or Al alloy fine particles and a volume fraction of 1~
10% Ni, Cu, or a mixture of alloys containing either of these as main components, and a volume ratio of 1
-10% of Ti or Ti alloy fine particles, and the total volume fraction of these fine particles is 62 to 95%, and the formed body is mixed with Al as a matrix metal, Al alloy, A method for producing a metal matrix composite material, in which the metal matrix composite material is brought into contact with a molten metal of a light metal selected from the group consisting of Mg and Mg alloys, and the molten metal permeates into the molded body without substantially pressurizing the material, and a discrete reinforcing material. , fine pieces of Al or Al alloy with a volume ratio of 60 to 80%, fine pieces of Ni, Cu, or an alloy mainly composed of any of these, or a mixture thereof with a volume ratio of 1 to 10%, and a volume ratio of 1 ~10% of Ti or Ti alloy fine particles, and the total volume fraction of these fine particles and the reinforcing material is 62 to 95%. Achieved by a method for producing a metal matrix composite material, in which the molten metal is brought into contact with a molten metal selected from the group consisting of Al alloy, Mg, and Mg alloy, and the molten metal permeates into the molded body without substantially applying pressure. be done. Effect of the invention According to the present invention, fine pieces of Al or Al alloy, Ni,
Fine pieces of Cu or alloys containing either of these as a main component or mixtures thereof, and fine pieces of Ti or Ti alloys are used. Fine pieces of Al or Al alloys have excellent compatibility with molten metals such as Al alloys, and the tendency of Ni, Cu, or alloys containing either of these as their main components to form oxides is relatively small, and the surface oxide film is less likely to form. Since the amount is small, these fine pieces have excellent wettability with molten metal such as Al alloy. When the compact is brought into contact with molten matrix metal and heated by the heat of the molten metal, Al
Alternatively, Al in the fine pieces of Al alloy (and Al or Mg in the matrix metal) reacts well with Ni or Cu to form fine intermetallic compounds and generates a moderate amount of heat, and the heat causes Al or Mg to react well with Ni or Cu. As the fine pieces of Al alloy are melted, the wettability of the fine pieces and the reinforcing material to the molten metal is improved, and as a result, the molten Al or Al alloy can penetrate well toward the center of the compact, and the matrix metal The molten metal penetrates into the molded body better than its surroundings, and as a result, the matrix metal is compositely reinforced with at least a fine intermetallic compound, and a good composite material containing no micropores is formed. Further, according to the present invention, the volume fraction of fine pieces of Al or Al alloy is set to be relatively high at 60 to 80%, so that the porosity of the molded body is set to be relatively low. In addition, when Ti, which has a high tendency to form nitrides and oxides, is heated by the heat generated by the combination reaction or the heat of the molten metal, nitrogen and oxygen, which are the main components of the air present in the voids of the molded body, Also, some of the oxygen in the air present in the cavity of the molded body reacts with the molten Al, thereby substantially removing the air in the molded body. The generation of micropores is also prevented. Furthermore, according to the present invention, if the melting point (solidus temperature) of the light metal as the matrix metal is T°C,
A good composite material can also be produced when the temperature of the light metal molten metal is in the solid-liquid coexistence temperature range of T to T+50°C. However, in this case, the solid phase ratio of the molten metal is 70%.
Below, it is particularly preferable that it is 50% or less. In addition, the fine metal pieces in the present invention may be in the form of powder, short fibers, whiskers, etc., and the size of the metal particles in the case of powder is 1 to 1.
It is preferably about 500 μm, especially about 3 to 200 μm, and in the case of short fibers and whiskers, the average fiber diameter
0.1μm to 1mm, especially 1 to 200μm, average fiber length 1μm
It is preferably about 1 to 10 mm, particularly about 1 to 200 μm. Further, the reinforcing material in the present invention may be in the form of short fibers, whiskers, particles, etc., and the size of the reinforcing material is such that short fibers and whiskers have an average fiber diameter of 0.1 to 20 μm, particularly 0.3 to 10 μm, and an average fiber diameter of 0.3 to 10 μm. Fiber length 5μm
It is preferably about 10 mm to 10 mm, especially about 10 μm to 3 mm, and in the case of particles, the average particle size is preferably about 0.1 to 100 μm, especially about 1 to 30 μm. The Ni content of the Ni alloy used in the present invention is preferably 50 wt% or more, particularly 80 wt% or more, and elements other than Ni, excluding unavoidable impurities, may be any element, but Especially Ag, Al,
B, Co, Cr, Cu, Fe, Mg, Mn, Mo, Pb,
Preferred are Si, Sn, Ta, Ti, V, Zn, and Zr. Similarly, Cu of the Cu alloy used in the present invention
The content is preferably 50 wt% or more, particularly 80 wt% or more, and the elements other than Cu, excluding unavoidable impurities, may be any element, but in particular Ag,
Al, B, Co, Fe, Mg, Mn, Ni, Pb, Si, Sn,
Ta, Ti, V, Zr, and Zn are preferable. Furthermore, the Ti content used in the present invention
It is preferably 50 wt% or more, especially 80 wt% or more, and the elements other than Ti, excluding unavoidable impurities, may be any element, but in particular Al, V, Sn,
Fe, Cu, Mn, Mo, Zr, Cr, Si, and B are preferable. DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by way of example embodiments with reference to the accompanying figures. Example 1 Alumina-silica short fibers with an average fiber diameter of 3 μm and an average fiber length of 1.5 mm (manufactured by Isolite Industries Co., Ltd.)
and Al alloy powder with an average particle size of 150 μm (JIS standard
AC8A) or Al powder alloy powder with an average particle size of 100 μm or (JIS standard AC7A), pure Ti powder with an average particle size of 20 μm, and pure Ni powder with an average particle size of 20 μm are mixed in various ratios and compression molded. As shown in Figure 1, unless the total volume ratio exceeds 95%, the volume ratio is 0%, 5%, 10%, 15%, 20%.
% alumina-silica short fibers 10, volume fraction 40
%, 50%, 60%, 70%, 80% Al alloy powder 12
and pure volume fraction of 0%, 1%, 5%, 10%, 15%
Ti powder 14, volume percentage 0%, 1%, 3%, 5%,
It consists of 7%, 10%, and 15% pure Ni powder16,
A molded body 18 having dimensions of 45 x 25 x 10 mm was formed. Next, as shown in FIG. 2, each molded body 18 is sequentially immersed in a molten metal 22 of Al alloy (JIS standard AC8A) maintained at 570°C by a heater 20, and this state is maintained for about 30 seconds. was taken out from the molten metal, and the molten metal was allowed to solidify in that state. The composite material thus formed is then cut;
When the impregnated state of the molten metal was investigated by observing its cross section, the results shown in Tables 1 and 2 below were obtained. In Tables 1 and 2, ◎ indicates that no micropores were present, ○ indicates that a very small amount of micropores were generated, and △ indicates that a small amount of micropores were generated. It shows that In particular, Table 1 shows that the volume percentage of alumina-silica short fibers is 0%, 5%, and 10%.
%, 15%, 20% and the volume fraction of pure Ni powder is 0
%, 15%, and Table 2 shows the results when the volume percentage of alumina-silica short fibers is 0%, 5%,
10%, 15%, and 20%, and the results are shown when the volume fraction of pure Ni powder is 1%, 3%, 5%, 7%, and 10%. From Tables 1 and 2, regardless of the composition of Al alloy powder, the volume fraction of Al alloy powder is 60 to 80%, and pure
It can be seen that the volume fractions of both Ni powder and pure Ti powder are preferably 1 to 10%. In addition, when the cross section of the composite material indicated by ◎ in Table 2 was investigated by X-ray diffraction, pure Ni powder almost completely reacted with Al, forming intermetallic compounds NiAl ₃ ,
NiAl, and when the volume fraction of alumina-silica short fibers is 0%, the Al alloy as a matrix is compositely reinforced by these intermetallic compounds, and the volume fraction of alumina-silica short fibers is 5%. ~20% as a matrix
It was confirmed that the Al alloy was compositely reinforced not only by alumina-silica short fibers but also by intermetallic compounds. Example 2 SiC whiskers (manufactured by Tokai Carbon Co., Ltd., average fiber diameter 0.3 μm, average fiber length 100 μm) as a reinforcing material with a volume percentage of 5%, pure Al powder (average particle size 50 μm) with a volume percentage of 70%, Four compacts are formed by mixing and compression molding pure Ni powder (average particle size 30 μm) with a volume ratio of 5% and pure Ti powder (average particle size 30 μm) with a volume ratio of 5%. The procedure was the same as in Example 1 above, except that molten Al alloy (JIS standard A2024) set at 550°C, 600°C, 650°C, 700°C, and 750% was used as the molten metal. A composite material was produced under the following conditions, and the impregnation state of the molten metal was investigated by observing its cross section. As a result, it was found that a good composite material was formed without the formation of micropores, regardless of the temperature of the molten matrix metal. Example 3 SiC particles (manufactured by Showa Denko K.K., average particle size 30 μm) as a reinforcing material with a volume fraction of 10% and a volume fraction of 60%
Al alloy powder (JIS standard A2024, average particle size 150μm)
and pure Ni powder with a volume fraction of 8% (average particle size 30 μm)
A molded body is formed by mixing and compression molding pure Ti powder (average particle size 30 μm) with a volume ratio of 3%, and the molten metal is heated to a temperature of approximately 550°C.
℃ semi-molten Al alloy (Al-30%Cu) was used, and the molded body was immersed in the molten metal for about 30 minutes.
A composite material was formed in the same manner and under the same conditions as in Example 1 above, except that the time was set to 1.5 seconds, and the impregnation state of the molten metal was investigated by observing its cross section. As a result, it was confirmed that a good composite material containing no micropores was formed in this example as well. In addition, when the cross section of the material formed in Example 2 and Example 3 was examined by X-ray diffraction, it was found that the material was pure.
Ni powder almost completely reacts with Al to form an intermetallic compound.
NiAl ₃ and NiAl, and it was recognized that the Al alloy as the matrix metal was compositely strengthened not only by the reinforcing material but also by these intermetallic compounds. Example 4 Alumina short fibers (“Safir RF” manufactured by ICI, average fiber diameter 3 μm, average fiber length 1 mm) with a volume ratio of 15% and Al alloy fibers with a volume ratio of 65% (manufactured by Aisin Seiki Co., Ltd.) were used as reinforcing materials. , Al-5%Mg, average fiber diameter 60μm, average fiber length 3mm) and volume ratio 5%
Pure Ni fiber (manufactured by Tokyo Steel Corporation, average fiber diameter
20μm, average fiber length 1mm) and pure Ti with a volume fraction of 10%
Fiber (manufactured by Tokyo Steel Corporation, average fiber diameter 20 μm,
An average fiber length of 1 mm) was mixed and compression molded to form a molded body. Next, this molded body was placed in a mold at 400℃ (JIS standard 10
molten Mg alloy (SAE standard AZ91) at a temperature of 650℃ is poured into the mold, and sulfur hexafluoride gas is poured onto the surface of the molten metal to prevent oxidation of the Mg alloy. While cooling the molten metal to room temperature. The composite material thus formed is then cut;
When the impregnated state of the molten metal was investigated by observing the cross section, it was found that a good composite material containing no micropores was formed in this example as well. Furthermore, when the cross section of the composite material formed in this example was investigated by X-ray diffraction, it was found that the matrix metal in the central part was an Al alloy, the matrix metal in the peripheral part was a Mg alloy, and the pure Ni fibers were It reacts with Al to form intermetallic compounds NiAl ₃ and NiAl,
Especially in the periphery, pure Ni fibers also react with Mg and become intermetallic compounds Mg ₂ Ni and MgNi ₂ .
The ratio of these intermetallic compounds increased toward the outer periphery, and it was recognized that the matrix was compositely strengthened not only by the reinforcing agent but also by these intermetallic compounds. In this example, a composite material was formed in the same manner by replacing the Ni fibers with the pure Ni powder used in Example 3, and the molten Mg alloy was replaced with the molten Mg pure at a temperature of 680°C. When a composite material was formed in the same manner by replacing it, a good composite material containing no micropores was able to be formed in each case. Example 5 Pure Al powder with a volume fraction of 72% (average particle size 50 μm),
By mixing and compression molding pure Ni powder (average particle diameter 30 μm) with a volume fraction of 6% and pure Ti powder (average particle diameter 30 μm) with a volume fraction of 5%, a molded body made of these is formed and a matrix is formed. A composite material was formed in the same manner and under the same conditions as in Example 1 above, except that a molten Al alloy (JIS standard A2024) with a hot water temperature of 650° C. was used as the molten metal. Next, the state of impregnation with the molten metal was investigated by observing the cross section of the composite material thus formed, and it was found that a good composite material containing no micropores had been formed. In addition, when a cross-section of the composite material was examined using X-ray diffraction, it was found that the matrix in the center and the periphery was substantially pure Al.
The pure Ni powder almost completely reacted with Al to form intermetallic compounds NiAl ₃ and NiAl, and it was recognized that the matrix was compositely strengthened by these intermetallic compounds. . In this example, a composite material was similarly formed by replacing the matrix metal molten metal with a pure Mg molten metal at a temperature of 680°C. In this case as well, a good composite material containing no micropores was formed. was completed. Example 6 A composite material was formed in the same manner and under the same conditions as in Example 1 above, except that pure Cu powder with an average particle size of 30 μm was used instead of pure Ni powder, and its cross section was observed. The impregnation state of the molten metal was investigated by doing this. As a result, the same results as in Example 1 described above were obtained. In other words, regardless of the composition of Al alloy powder, Al
It was confirmed that the volume fraction of the alloy powder is preferably 60 to 80%, and the volume fraction of both the pure Cu powder and the pure Ti powder is preferably 1 to 10%. Furthermore, when the cross section of a composite material formed by setting the volume fraction of AI alloy powder, pure Cu powder, and pure Ti powder within the above-mentioned preferred range was investigated by X-ray diffraction, it was found that the pure CU powder was almost completely absorbed. It reacts with Al to form intermetallic compounds such as CuAl ₂ , and when the volume fraction of alumina-silica short fibers is 0%, the Al alloy as a matrix is compositely reinforced by these intermetallic compounds. It was observed that when the volume fraction of alumina-silica short fibers was 5 to 20%, the Al alloy as a matrix was compositely reinforced not only by alumina-silica short fibers but also by intermetallic compounds. . Example 7 A composite material was produced in the same manner and under the same conditions as in Example 2 above, except that pure Cu powder with an average particle size of 30 μm was used instead of pure Ni powder. As a result, it was found that a good composite material was formed without the formation of micropores, regardless of the temperature of the molten matrix metal. Example 8 A composite material was produced in the same manner and under the same conditions as in Example 3 above, except that pure Cu powder with an average particle size of 30 μm was used instead of pure Ni powder. As a result, it was confirmed that a good composite material containing no micropores was formed in this example as well. When the cross-sections of the composite materials formed in Examples 7 and 8 were examined by X-ray diffraction, it was found that they were pure.
Cu powder almost completely reacts with Al to form intermetallic compounds such as CuAl ₂ , which can be used as a matrix.
It was recognized that Al alloys are compositely strengthened not only by reinforcing materials but also by these intermetallic compounds. Example 9 Same procedure and conditions as in Example 4 above, except that pure Cu fibers (manufactured by Tokyo Steel Corporation, average fiber diameter 20 μm, average fiber length 1 mm) were used instead of pure Ni fibers. Composite materials were manufactured using a method, and the impregnation state of the molten metal was investigated by observing the cross section of the composite materials. As a result, it was confirmed that a good composite material containing no micropores was formed in this example as well. Furthermore, when the cross section of the composite material formed in this example was investigated by X-ray diffraction, it was found that the matrix in the central part was an Al alloy, the matrix in the peripheral part was Mg, and the pure Cu fibers reacted with Al. Especially in the periphery, pure Cu fibers also react with Mg to form fine intermetallic compounds such _{as MgCu 2 ,} and these intermetallic compounds The ratio increases toward the outer periphery, indicating that the matrix is compositely reinforced not only by the reinforcing material but also by these intermetallic compounds. In this example, a composite material was formed in the same manner by replacing the Cu fibers with the pure Cu powder used in Example 8, and the molten Mg alloy was replaced with the molten pure Mg at a temperature of 680°C. When a composite material was formed in the same manner by replacing it, a good composite material containing no micropores was able to be formed in each case. Example 10 A composite material was formed in the same manner and under the same conditions as in Example 5 above, except that pure Cu powder with an average particle size of 30 μm was used instead of pure Ni powder. Next, the state of impregnation with the molten metal was investigated by observing the cross section of the composite material thus formed, and it was found that a good composite material containing no micropores had been formed. In addition, when examining the cross section of the composite material using X-ray diffraction, it was found that the pure Cu powder almost completely reacted with Al to form intermetallic compounds such as _CuAl2 , and the matrix was composited by these intermetallic compounds. It was found that it had been strengthened. In this example, a composite material was similarly formed by replacing the matrix metal molten metal with a pure Mg molten metal at a temperature of 680°C. In this case as well, a good composite material containing no micropores was formed. was completed. Example 11 Alumina-silica short fibers with an average fiber diameter of 3 μm and an average fiber length of 1.5 mm (manufactured by Isolite Industries Co., Ltd.)
and Al alloy powder with an average particle size of 150 μm (JIS standard
AC8A) or Al powder alloy powder (JIS standard AC7A) with an average particle size of 100 μm, pure Ti powder with an average particle size of 30 μm, pure Ni powder with an average particle size of 30 μm, and
By mixing 30μm pure Cu powder in various ratios and compression molding, the volume ratio is 0%, 5%, 10%, 15% unless the total volume ratio exceeds 95%.
%, 20% alumina-silica short fibers and volume fraction 40
%, 50%, 60%, 70%, 80% Al alloy powder,
Pure Ti powder with a volume fraction of 0%, 1%, 5%, 10%, 15%, pure Cu powder with a volume fraction of 0.5%, and a volume fraction of 0.5%~
15% (every 0.5%) pure Ni powder and 45×
A molded body with dimensions of 25 x 10 mm was formed. In addition, the volume fraction of pure Ni powder was set to 0.5%, and the
A molded body having dimensions of 45 x 25 x 10 mm was similarly formed, except that the volume fraction of Cu powder was set at 0.5% to 15% (in 0.5% increments). Next, a composite material was formed in the same manner and under the same conditions as in Example 1 above, except that the molded body thus formed was used, and the impregnation state of the molten metal was investigated by observing its cross section. . As a result, as in the case of Example 1 above, regardless of the composition of the Al alloy powder, the volume fraction of the Al alloy powder is
The volume fraction of pure Ni powder + pure Cu powder is 1 to 10%, and the volume fraction of pure Ti powder is also 1 to 10%.
% was confirmed to be preferable. In addition, the cross section of the composite material formed by setting the volume fraction of Al alloy powder, pure Ni powder + pure Cu powder, and pure Ti powder to the above-mentioned preferred range is
When investigated by line diffraction, pure Ni powder and pure Cu
The powder almost completely reacts with Al to form intermetallic compounds such as NiAl ₃ or NiAl and CuAl ₂ , respectively, and when the volume fraction of alumina-silica short fibers is 0%, Al alloy is used as a matrix for these. When the volume fraction of alumina-silica short fibers is 5 to 20%, the Al alloy as a matrix is reinforced not only by alumina-silica short fibers but also by intermetallic compounds. Composite reinforcement was observed. Example 12 The above example except that pure Ni powder (average particle size 5 μm) with a volume fraction of 2.5% and pure Cu powder (average particle size 30 μm) with a volume fraction of 2.5% were used instead of pure Ni powder. A composite material was manufactured in the same manner and under the same conditions as in Case 2. As a result, it was found that a good composite material was formed without the formation of micropores, regardless of the temperature of the molten matrix metal. Example 13 The above example except that pure Ni powder with a volume fraction of 3% (average particle size 10 μm) and pure Cu powder with a volume fraction of 3% (average particle size 20 μm) were used instead of pure Ni powder. A composite material was manufactured in the same manner and under the same conditions as in case 3. As a result, it was confirmed that a good composite material containing no micropores was formed in this example as well. When the cross-sections of the composite materials formed in Examples 12 and 13 were examined by X-ray diffraction, it was found that they were pure.
Ni powder and pure Cu powder almost completely react with Al to form intermetallic compounds such as NiAl ₃ and CuaAl ₂ , respectively. It was also observed that the steel was reinforced in a composite manner. Example 14 Pure Ni fibers (average particle size 30 μm, average fiber length 3 mm) with a volume ratio of 5% and volume ratio 5% instead of pure Ni fibers
Pure Cu fiber ((average fiber diameter 20μm, average fiber length 1
A composite material was produced in the same manner and conditions as in Example 4 above, except that mm) was used;
The state of impregnation of the molten metal was investigated by observing the cross section. As a result, it was confirmed that a good composite material containing no micropores was formed in this example as well. Furthermore, when the cross section of the composite material formed in this example was examined by X-ray diffraction, it was found that the matrix in the central part was an Al alloy, the matrix in the peripheral part was Mg, and pure Ni fibers and pure Cu fibers were found. reacts with Al to form intermetallic compounds NiAl ₃ and CuAl ₂ , respectively. Particularly in the periphery, pure Ni fibers and pure Cu fibers also react with Mg to form NiMg 2 and CuAl ₂ , respectively.
Intermetallic compounds such as MgCu ₂ were also present, and it was recognized that the matrix was made into a composite material not only by reinforcing materials but also by these intermetallic compounds. In this example, a composite material was formed in the same manner by replacing the Ni fibers and Cu fibers with the pure Ni powder and pure Cu powder used in Example 13, respectively,
Furthermore, when composite materials were formed in the same manner by replacing the Mg alloy molten metal with pure Mg molten metal at a hot water temperature of 680°C, good composite materials containing no micropores could be formed in both cases. Example 15 The above example except that pure Ni powder (average particle size 15 μm) with a volume fraction of 4% and pure Cu powder (average particle size 25 μm) with a volume fraction of 4% were used instead of pure Ni powder. A composite material was formed in the same manner and under the same conditions as in case 3. Next, the state of impregnation with the molten metal was investigated by observing the cross section of the composite material thus formed, and it was found that a good composite material containing no micropores was formed. In addition, when examining the cross section of the composite material using X-ray diffraction, it was found that pure Ni powder and pure Cu powder almost completely reacted with Al, respectively.
It has become intermetallic compounds such as NiAl ₃ and CuAl ₂ .
It was observed that the matrix was compositely strengthened not only by the reinforcing material but also by these intermetallic compounds. Example 16 The above example except that pure Ni powder (average particle size 15 μm) with a volume fraction of 5% and pure Cu powder (average particle size 25 μm) with a volume fraction of 5% were used instead of pure Ni powder. A composite material was formed in the same manner and under the same conditions as in case 5. Next, the state of impregnation with the molten metal was investigated by observing the cross section of the composite material thus formed, and it was found that a good composite material containing no micropores had been formed. In addition, when a cross-section of the composite material was examined using X-ray diffraction, it was found that the matrix in the center and the periphery was substantially pure Al.
Pure Ni powder and pure Cu powder almost completely react with Al to form intermetallic compounds such as NiAl ₃ and CuAl ₂ , respectively, and the matrix is compositely strengthened by these intermetallic compounds. It was recognized that In this example, a composite material was similarly formed by replacing the matrix metal molten metal with a pure Mg molten metal at a temperature of 680°C. In this case as well, a good composite material containing no micropores was formed. was completed. In this example, a composite material was similarly formed by replacing the matrix metal molten metal with a pure Mg molten metal at a temperature of 680°C. In this case as well, a good composite material containing no micropores was formed. was completed. Although fine particles having a specific composition are used in each of the above embodiments, the fine particles in the present invention may have any composition. for example
The composition of Al alloy is JIS standard AC7A, JIS standard ADC12,
It may be JIS standard ADT17, 8% Al-3.5% Mg, etc., and the composition of the Ni alloy is, for example, Ni-50% Al, Ni-30.
%Cu, Ni-39.5%Cu-22.1%Fe, 8.8%B, etc., and the composition of the Cu alloy is, for example, Cu-50%Ml,
It may be Cu-29.6%Ni-22.1%Fe-8.8%B, etc. In particular, when the Ni alloy and Cu alloy are Ni-Cu alloys, the content ratio of Ni and Cu may be any ratio. Often, even TI alloys, e.g. Ti-1%
It may be B etc. Although the present invention has been described in detail with reference to a number of embodiments above, the present invention is not limited to these embodiments, and various other embodiments are possible within the scope of the present invention. This will be obvious to those skilled in the art. For example, part or all of the Ni or Ni alloy fine pieces or the Cu or Cu alloy fine pieces may be replaced with Ag or Ag alloy fine pieces or Au or Au alloy fine pieces. Effects of the Invention As is clear from the above description, according to the present invention, the molten matrix metal penetrates well into the entire molded body, Ti reacts with nitrogen and oxygen in the molded body, and Ti reacts with nitrogen and oxygen in the molded body. Because part of the oxygen reacts with Al, the air in the molded body is substantially removed, making it possible to produce an even better composite material that does not contain micropores. Further, according to the present invention, the molten matrix metal may be at a relatively low temperature, and the compact may not contain fine pieces of Ni or Ni alloy or fine pieces of Ti or Ti alloy. In comparison, since the time for which the molded body is brought into contact with the molten metal can be shortened, the composite material can be manufactured even more inexpensively and efficiently than in the case of the method according to the above-mentioned earlier proposal.

【table】

【table】 [Brief explanation of the drawing]

Figure 1 is a perspective view showing a compact made of alumina-silica short fibers, Al alloy powder, pure Ti powder, and pure Ni powder, and Figure 2 is a perspective view of the compact shown in Figure 1.
FIG. 2 is an illustrative cross-sectional view showing a state of being immersed in a molten Al alloy. 10...Alumina-silica short fiber, 12...Al alloy powder, 14...Pure Ti powder, 16...Pure Ni powder, 1
8... Molded body, 20... Heater, 22... Molten metal of Al alloy.

Claims (1)

[Claims] 1. Fine pieces of Al or Al alloy with a volume fraction of 60 to 80%,
Contains fine pieces of Ni, Cu, or alloys containing any of these as main components, or a mixture thereof, with a volume percentage of 1 to 10%, and fine pieces of Ti or a Ti alloy, with a volume percentage of 1 to 10%, and these Total volume fraction of fine particles is 62-95
%, and the molded body is brought into contact with a molten metal of a light metal selected from the group consisting of Al, Al alloy, Mg, and Mg alloy as a matrix metal, without substantially pressurizing the molten metal. A method for producing a metal matrix composite material that is infiltrated into the molded body. 2 Discrete reinforcing materials, fine pieces of Al or Al alloy with a volume fraction of 60-80%, and Ni, Cu with a volume fraction of 1-10%
or a fine piece of an alloy containing any of these as a main component or a mixture thereof, and a fine piece of Ti or a Ti alloy with a volume percentage of 1 to 10%, and the total volume of these fine pieces and the reinforcing material A molded body having a matrix metal of 62 to 95% is formed, and the molded body is brought into contact with a molten metal of a light metal selected from the group consisting of Al, Al alloy, Mg, and Mg alloy as a matrix metal, and the molten metal is substantially A method for producing a metal matrix composite material, which is infiltrated into the molded body without applying pressure.