JP2576186B2 - Manufacturing method of metal matrix composite material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a composite material, and more particularly to an inorganic short fiber other than metal, whisker, or particle as a reinforcing material,
The present invention relates to a method for producing a metal matrix composite material using an aluminum alloy or the like as a matrix. Problems to be solved by conventional technology and invention For example, sponsored by the Japan Institute of Light Metals, July 15, 1985
Reinforced fibers are continuous fibers, as described in the booklet entitled "Forming Aluminum Composite Materials (FRM)" distributed at the 3rd Metal Forming Seminar held in Atami City on the 16th. As methods for producing fiber-reinforced metal composite materials, there are a diffusion bonding method, a plasma spray method, a vapor deposition method, a melt infiltration method, an electrodeposition method (plating method), and the like.
It is known that a method for producing a fiber-reinforced metal composite material in which the reinforcing fibers are discontinuous fibers includes a powder metallurgy method, a compo-casting method, a molten metal forging method, a semi-solid processing method, an HIP method, and the like.

Particularly when the reinforcing fiber is a discontinuous fiber, the above-described melt forging method (high-pressure casting method) has been generally employed mainly since the above-described method is superior in mass productivity as compared with the other methods described above. ing. However, in the squeeze forging method, it is necessary to press the melt of the matrix metal to a very high pressure, so that the manufacturing equipment becomes large-scale, and therefore, the production of the composite material becomes expensive, which results in the complex This is one of the major obstacles to the practical use of materials.

Thus, in the production of a composite material in which the reinforcing fibers are discontinuous fibers, it is required to reduce the required pressure on the molten metal of the matrix metal and further omit the pressurization. To achieve this, it is necessary to greatly improve the wettability between the reinforcing fibers and the molten metal of the matrix metal.

In view of such a demand, for example, Japanese Patent Application Laid-Open No. 61-295344 proposes to use an aluminum alloy to which a special element is added as a matrix metal. However, there is a problem that sufficient wettability cannot be ensured only by adding a special element to the matrix metal, and that the composition of the matrix metal is limited to a specific one.

Various methods have been proposed for improving the wettability of the matrix metal to the molten metal in the case where the reinforcing fibers are continuous fibers.
JP-A-42504 describes a method in which a metal powder is applied to the surface of a fiber to thereby improve wettability, and is disclosed in JP-A-50-109904, JP-A-52-28433, and JP-A-53-28433. −38791
JP-A-57-169036 and JP-A-57-169037 each disclose a method of coating the surface of a fiber with a metal to thereby improve the wettability. As described above, when the reinforcing fibers are continuous fibers, since the fibers are generally oriented in one direction, the molten metal of the matrix metal penetrates between the individual continuous fibers due to the capillary phenomenon, and thus the method described above is used. According to this, the wettability between the fiber and the molten metal of the matrix metal can be improved.

However, if the reinforcing fibers are short fibers or whiskers,
Since they are discontinuous, it is impossible to expect the penetration of the molten metal of the matrix metal by capillary action, and therefore, as described in, for example, JP-A-59-205464, the wettability of continuous fibers is improved. Simply applying the method known as a means for causing the fibers to short fibers or whiskers cannot sufficiently improve their wettability. If the reinforcing fibers are short fibers or whiskers,
It is difficult to coat a large amount of these metals or apply a large amount of metal powder, and the cost is very high. These problems are addressed in U.S. Patent Nos. 4,376,803 and 4,569,886.
The same applies to the case where the surface of the fiber is coated with a metal oxide as described in Japanese Patent Application Laid-Open Publication No. H11-209,878.

In addition, Japanese Patent Application Laid-Open No.
As described in JP-A-31466 and JP-A-62-67133, there is known a method in which a reinforcing material molded body is preheated to a predetermined temperature, and then a molten metal of a matrix metal is pressure-penetrated into the molded body. Have been. According to this method, when the reinforcing material itself is heated to a certain temperature, the wettability of the matrix metal with the molten metal is improved, and the permeability of the molten matrix metal is improved as compared with a case where the molded body is not preheated. I do. However, in these methods, it is essential to preheat the compact, and special measures are required for these methods. Therefore, these methods are also limited in the efficiency and cost reduction of the production of composite materials. There is.

In addition, Japanese Patent Application Laid-Open No.
As described in JP-A-61-165265, a reinforcing material is utilized by utilizing a redox reaction between a metal oxide contained in a molded product of the reinforcing material and a specific metal element in a matrix metal. There is known a method for improving the permeability of a matrix metal melt in a molded article. However, in this method, there is a problem that a composite material using a metal having an arbitrary composition as a matrix metal cannot be produced because the elements that undergo a redox reaction with each other are limited to some extent. Also, depending on the combination and amount of the elements, heat is excessively and rapidly generated,
Problems such as erosion of the mold may occur.

Further, in any of the above-mentioned conventional methods, it is essential to press the molten metal of the matrix metal to a certain relatively high pressure. Therefore, in these conventional methods, the pressurization of the molten metal of the matrix metal is omitted. In addition, it is not possible to efficiently and inexpensively produce a composite material by omitting the use of a casting or the like necessary for pressurization. Since it is inevitable that the matrix metal is solidified, there is a problem that the yield cannot be improved.

In addition, JP-T-59-500973 and the Journal of Materials Science Letters published in April 1985 state that a molded article of a reinforcing fiber is pretreated with a fluorine-containing reagent, and the molded article contains a molten metal of a matrix metal. A method for producing a composite material is described. However, in this method, the reinforcing fibers are limited to reinforcing fibers containing carbon or carbide as a main component or surface-coated with carbon or carbide, and the preformed body is preheated before being impregnated with the molten matrix metal. There is a problem that it is necessary to do.

In view of the above-described problems in the conventional method for producing a composite material, the inventors of the present application have conducted various experimental studies.As a result, even when the reinforcing material is in the form of short fibers, whiskers or particles, It has been found that various problems as described above can be solved by mixing fine pieces of a specific metal oxide into a molded product of a reinforcing material.

The present invention is based on the knowledge obtained as a result of various experimental studies performed by the inventors of the present application, and when the reinforcing material is an inorganic short fiber other than metal, whisker, particles, or a mixture thereof, An object of the present invention is to provide a method capable of efficiently and inexpensively producing a composite material in which the matrix metal is well filled between the individual reinforcing materials without pressurizing the melt of the matrix metal.

Further, the present invention provides a highly efficient composite material having a predetermined shape and dimensions without using a mold for shaving a molten metal of a matrix metal or a mold for manufacturing a composite material having a predetermined shape. It is an object of the present invention to provide a method which can be manufactured at a very high yield at a low cost.

Means for Solving the Problems The object as described above is, according to the present invention, a reinforcing material selected from the group consisting of inorganic short fibers other than metals, whiskers, particles, and mixtures thereof, and W, Mo, Pb, Bi, V,
Fine particles of metal oxides selected from the group consisting of oxides of Cu, Ni, Co, Sn, Mn, B, Cr, Mg, Al, and mixtures thereof, and these are mixed substantially uniformly Forming a shaped body, contacting at least a part of the shaped body with a molten metal of a matrix metal selected from the group consisting of Al, Mg, an Al alloy, and an Mg alloy, and substantially pressurizing the molten metal. This is achieved by a method for producing a metal-based composite material that can be permeated into the molded article without any problem.

Effects and Effects of the Invention According to the method of the present invention, a molded article containing the reinforcing material and the fine pieces of the specific metal oxide and substantially uniformly mixed with each other is formed, and at least one of the molded articles is formed. The part is brought into contact with the matrix metal melt. Since the fine pieces of the specific metal oxide as described above have a better wettability to a molten metal such as an aluminum alloy than the fine pieces of other metal oxides, the molten metal of the matrix metal is finer than the specific metal oxide. It gradually penetrates into the molded body, thereby coming into contact with the reinforcing material sequentially, and furthermore, the molten metal of the matrix metal reacts with the fine pieces of the specific metal oxide to generate an appropriate amount of heat, and the heat forms the molten metal. The permeability into the body and the wettability of the reinforcing material are improved, so that the molten metal of the matrix metal permeates well throughout the molded body.

Therefore, according to the method of the present invention, there is no need to press the molten metal of the matrix metal or control the atmosphere, and therefore, there is no need for a large-scale facility for pressurizing the molten metal of the matrix metal or controlling the atmosphere. Composite materials in which the matrix metal is well filled between the individual reinforcements can be produced much more efficiently and inexpensively than conventional methods.

Further, according to the method of the present invention, as described above, the molten metal of the matrix metal penetrates well into the molded body, so that the reinforcing material and the fine pieces of the specific metal oxide are contained substantially uniformly. If the mixed molded body is formed in a predetermined shape and size, and a part thereof is brought into contact with the molten metal of the matrix metal, the molten metal of the matrix metal quickly permeates the entire molded body without excess or shortage. As a result, a composite material having a predetermined shape and dimensions is formed. Therefore, the conventional molten metal which requires a mold for pressing the molten metal of the matrix metal and defining a predetermined product shape, and in which a large amount of matrix metal is inevitably solidified in portions other than the composite material in the mold. Compared with a forging method or the like, a composite material having a substantially predetermined shape and size can be manufactured very efficiently and at a low cost with a very high yield.

Further, according to the method of the present invention, it is not necessary to coat the surface of the reinforcing material with the metal oxide or to apply the metal oxide powder to the surface of the reinforcing material by a special treatment step. A method of coating a metal oxide on the surface of a reinforcing material or applying a metal oxide powder on a surface of the reinforcing material, since it is only necessary to mix and mold the fine pieces of the material so as to be substantially uniform with the fine pieces of the material. The composite material can be manufactured much more efficiently and at a lower cost than in the case of (1).

According to the results of the experimental research conducted by the inventors of the present application, if the above-mentioned fine pieces of the specific metal oxide are contained in the compact, the permeability of the matrix metal molten metal into the compact is improved. Although the weight ratio of the specific metal oxide fine pieces to the reinforcement is 7.5% or more, especially 10% or more,
Furthermore, when it is 15% or more, the molten metal of the matrix metal can be satisfactorily penetrated into the molded body. Thus, according to one particular feature of the invention, the amount of specific metal oxide fines in the compact is 7.5% by weight to reinforcement.
% Or more, preferably 10% or more, even more preferably 15%
This is set as above.

Further, according to the results of an experimental study conducted by the inventors of the present application, the metal constituting a fine piece of a specific metal oxide is W, M
o, Pb, Bi, Cu, Ni, Co, Sn, Mn, Cr, and any of the alloys containing any of them as main components, especially W, Mo, Pb, Co, Mn, and those When any one of the alloys containing any one of the above as a main component, the molten metal of the matrix metal can be satisfactorily penetrated into the molded body. Therefore, according to another detailed feature of the present invention, the metal constituting the fine piece of the specific metal oxide is W, Mo, Pb, Bi, Cu, Ni, C
o, Sn, Mn, Cr, and any of the alloys containing any of them as the main components, preferably W, Mo, Pb, Co, Mn, and the group consisting of the alloys containing any of them as the main components Set to the selected metal.

According to the results of an experimental study performed by the inventors of the present application, when the matrix metal is an Al alloy,
When the alloy contains at least 0.5% or more of Mg, Zr, and Ca in total, the molten metal of the matrix metal can be more satisfactorily permeated into the compact. Therefore, according to yet another detailed feature of the present invention, the matrix metal is an Al alloy containing at least 0.5% of Mg, Zr, or Ca in total.

Further, according to the results of the experimental research conducted by the inventors of the present application, it was found that the total volume fraction of the reinforcing material and the fine pieces of the specific metal oxide in the compact was too low or too high, Satisfactorily penetrates the molten metal into the molded body. Therefore, according to yet another detailed feature of the present invention, the total volume fraction of the reinforcing material and the fine particles of the specific metal oxide in the compact is set to 4-85%, preferably 5-80%. Is done.

Also, according to the results of the experimental research conducted by the inventors of the present application, the volume fraction of the specific metal oxide fine pieces contained in the molded body is a high value, and the molten metal of the matrix metal is favorably contained in the molded body. However, the greater the amount of the fine pieces of a specific metal oxide, the more the composition of the matrix metal changes depending on the type.
Therefore, according to yet another detailed feature of the present invention, the volume fraction of the specific metal oxide fine pieces in the compact is set to 45% or less, preferably 40% or less.

According to yet another particular feature of the invention, the shaped body has a predetermined shape and dimensions, only a part of which is immersed in the molten matrix metal. According to such a method, a composite material having a predetermined shape and dimensions can be efficiently produced at a very high yield without pressurizing the molten metal of the matrix metal or using a mold or the like for defining a predetermined product shape. It can be manufactured at low cost.

In the method of the present invention, the molded body may or may not be preheated, but it is preferable that the molded body be preheated so that the wettability of the fine particles of the reinforcing material and the metal oxide is improved. In this case, the preheating temperature may be lower than the preheating temperature conventionally performed for a molded body containing no specific metal oxide. In the present invention, the form of the fine particles of the specific metal oxide may be any form such as powder, short fiber, and whisker.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Example 1 Alumina short fibers having an average fiber diameter of 3 μm and an average fiber length of 1 mm (“Safir RG” manufactured by ICI, 95% Al ₂ O ₃ , 5
% SiO ₂ ), a silicon carbide whisker having a fiber diameter of 0.1 to 1.0 μm and a fiber length of 50 to 200 μm (manufactured by Tokai Carbon Co., Ltd.), and silicon nitride particles having an average particle diameter of 10 μm (manufactured by Kojundo Chemical Co., Ltd.)
Was prepared.

Next, the reinforcing material and an oxide (Al ₂ O ₃ , ZrO ₂ , Fe ₂ O ₃ ,
CeO ₂ , SiO ₂ ) (Nissan Chemical Co., Ltd.) and a mixture thereof, and compression-molding the mixture, and drying these compacts to form a reinforcing material and fine particles of the oxide. A compact was formed.

Also the reinforcement and chloride _{(MnCl 2 · 4H 2 O,} NiCl 2 ·
6H ₂ O, TiCl ₄ , CuCl ₂ , ZnCl ₂ , and an aqueous solution or an ethanol solution of SnCl ₂ .2H ₂ O (manufactured by Nippon Shinkin Co., Ltd.) are mixed, and the mixture is suction-molded, and the molded bodies are formed The chloride is converted to oxide by heating to 500 ° C. in the air, and the molded body is dried, thereby forming a molded body composed of the reinforcing material and fine pieces of the oxide converted from the chloride. did.

The above reinforcing material, Ta ₂ O ₅ powder having an average particle size of 1.5 μm (manufactured by Mitsui Kinzoku Co., Ltd.), Nb ₂ O ₅ powder having an average particle size of 5 μm (manufactured by Mitsui Kinzoku Co., Ltd.), and Pbo powder having a particle size of 1 to 2 μm (Manufactured by Kojundo Chemical Co., Ltd.), V ₂ O ₅ powder having an average particle size of 5 μm (manufactured by Kojundo Chemical Co., Ltd.), Bi ₂ O ₃ powder having an average particle size of 6 μm (manufactured by Kojundo Chemical Co., Ltd.), average particle size 74 μm Co ₃ O ₄ powder (manufactured by Sumitomo Metal Mining Co., Ltd.), MgO with an average particle size of 0.05 μm
Powders (made by Ube Industries, Ltd.) are mixed in water, the mixture is compression-molded, and the compacts are dried to form a compact comprising a reinforcing material and fine particles of the oxide. Formed.

Further, the reinforcing material is mixed into an aqueous solution containing polyvinyl alcohol, the mixture is agitated, then suction molded, the molded articles are dried, and each molded article is mixed with Cr ₂ O ₃ (manufactured by Nippon Denko Corporation). Immerse in an aqueous solution in which H ₃ BO ₃ (manufactured by Kenei Pharmaceutical Co., Ltd.) and ammonium paramolybdate (manufactured by Nippon Shinkin Co., Ltd.) are dissolved, and heat the aqueous solution to 500 ° C. in the atmosphere for one hour. Thus, fine pieces of oxides of Cr, B, and Mo were generated, and water and polyvinyl alcohol were removed by evaporation, thereby forming a molded body composed of the reinforcing material and the fine pieces of the oxide.

Further, the above reinforcing material is mixed into an aqueous solution containing polyvinyl alcohol, the mixture is stirred, then suction molded, the molded articles are dried, and each molded article is subjected to an ammonium methanetungstate solution (manufactured by Nippon Shinkin Co., Ltd.). )
Immersed in it and then each compact was heated to 700 ° C in air for 1 hour.
By heating for a period of time, a fine piece of the oxide of W was generated and water was removed by evaporation, thereby forming a molded body composed of the reinforcing material and the fine piece of the oxide.

FIG. 1 is a perspective view showing an example of the formed body 10 thus formed. In the figure, 12 indicates a reinforcing material, and 14 indicates a fine piece of a metal oxide. In this case, by changing the mixing ratio of the reinforcing material and the metal oxide powder, the volume ratio of the reinforcing material is 5%, and the weight ratio of the metal oxide to the reinforcing material is reduced.
A molded body of 15% and a volume ratio of the reinforcing material of 15%,
A compact having a weight ratio of metal oxide to reinforcement of 15% was formed. Each compact had a size of 20 × 20 × 40 mm, and fine pieces of metal oxide were substantially uniformly dispersed in the compact.

Next, the molded body in which the metal oxide is an oxide of B is heated to 400 ° C.
Then, each of the other compacts is preheated to 600 ° C., and thereafter, as shown in FIG. 2, each compact 10 is placed in a molten metal container 16 and the matrix metal of 700 ° C. is placed in the container. Melt 18
Was poured and the molten metal was solidified without applying pressure. In this case, the Mg content as the matrix metal is 0.1
JIS standard AC1A, JIS which is%, 0.3%, 0.5%, 1%, 10%
Standard AC4C, JIS standard AC4D, JIS standard AC8A, JIS standard AC7B,
8 kinds of aluminum alloys with 0.3% Mg, Ca or Zr added to JIS standard AC4C, and JI
Three kinds of magnesium alloys of S standard MC-2, JIS standard MC-7 and JIS standard MC-8 were used.

Next, the composite material 20 formed in the original molded body portion is cut out from each of the solidified bodies manufactured as described above, and the central portion thereof is crossed in the transverse direction as shown by the phantom line 22 in FIG. After the cut surface was polished, the actual state and the observation with an optical microscope were performed to evaluate the quality of each composite material.

The results of these evaluations are shown in Tables 1 to 3 below when the matrix metal is an aluminum alloy, and in Tables 4 to 6 when the matrix metal is a magnesium alloy. In these tables, ◎ indicates that both the macroscopic composite state and the microscopic composite state were good, ○ indicates that the macroscopic composite state was good, and Δ indicates that the partial state was good. X indicates that only a complex composition has been achieved, and x indicates that no complex composition has been achieved at all (the same applies to Table 9 described later).

According to Tables 1 to 6, regardless of the type and volume ratio of the reinforcing material, and the composition of the aluminum alloy and the magnesium alloy, the compact was W, Mo, Pb, Bi, V, Cu, Ni, Co, Sn, Mn, and B. , Cr, M
Good compounding is achieved when fine particles of oxides of g and Al are included, and fine particles of oxides are further composed of W, Mo, Pb, Bi, Cu, and N.
It can be seen that when i, Co, Sn, Mn, and Cr, in particular, W, Mo, Pb, Co, and Mn, compounding is performed more favorably. When the matrix metal is an aluminum alloy, 0.5
% Or more of Mg or 0.5% or more of total Mg, Ca, or Zr
It can be seen that when an aluminum alloy containing is used, the composite is more preferably performed.

Although not shown as an example, it has been found that the compounding can be performed more favorably even when the aluminum alloy contains 0.5% or more of Mg, Ca, or Zr.

Comparative Example Only the same alumina short fiber as used in Example 1 was used, and the volume fraction of the short fiber was 5%.
%, 15%, 30%, and a molded article composed only of the same silicon carbide whisker as the silicon carbide whisker used in Example 1, and having a whisker volume ratio of 5%, 15%, 40%. Body, consisting of only the same silicon nitride particles as the silicon nitride particles used in Example 1, having a volume fraction of 5
%, 15% and 50% were formed, and the production of a composite material was attempted for each of the molded bodies in the same manner and under the same conditions as in Example 1. However, no good composite was achieved in any of the molded articles.

Also, except that each of the compacts of the comparative example was used and the molten metal of the matrix metal was pressed at various pressures using a high-pressure casting device, the composite was formed in the same manner and under the same conditions as in Example 1. Tried to manufacture the material. As a result, it was found that it is necessary to press the molten metal of the matrix metal at a pressure of at least 500 kg / cm ² in order to achieve a good composite.

Example 2 As shown in Example 1 described above, it is preferable that the reinforcing material compact contains fine particles of a specific metal oxide. We examined whether the value is appropriate.

First, a molded body composed of the reinforcing material shown in Tables 7 and 8 below and the metal oxide fine pieces shown in Table 9 was formed.
Using these compacts and the matrix metal melts shown in Table 9, composite materials were manufactured in the same manner as in Example 1, and each composite material was manufactured at the same capacity as in Example 1. The quality of the composite state was evaluated. The weight ratio of the metal oxide fine pieces to the reinforcing material was 0%, 2.5%, 5%, 7.5%.
%, 10%, 15%, 20%, 30%. The results of these evaluations are shown in Table 9 below.

As can be seen from Table 9, the weight ratio of the fine pieces of the metal oxide to the reinforcing material was 7.7 in order to achieve good composite, regardless of the type of the reinforcing material and the metal oxide and the composition of the matrix metal.
It is understood that the content is preferably 5% or more, particularly 10% or more, and more preferably 15% or more.

Example 3 Combination of a reinforcing material and a fine piece of a metal oxide which achieved good compounding in Example 1 described above (all of the compounding states are ◎ or ○ in Tables 1 to 6) Combination), wherein the volume ratio of the reinforcing material and the weight ratio of the metal oxide fine pieces to the reinforcing material are the same as those of Example 1 and the same mixture, as shown in FIG. A cylindrical molded body 24 having a length of 30 mm and a length of 50 mm was formed. In FIG. 4, 26 and 28
Indicates fine pieces of the reinforcing material and the metal oxide, respectively. In addition, molten metals of the same eight kinds of aluminum alloys and three kinds of magnesium alloys as the matrix metal used in Example 1 were prepared as the matrix metal.

Next, each compact was preheated to the same temperature as in Example 1, and thereafter, as shown in FIG. 5, the upper end of each compact 24 was held by a tweezer-shaped holder 30, and each compact was held. Was brought into contact with a 700 ° C. matrix metal melt 34 stored in a melt vessel 32. Then, the molten metal of the matrix metal permeated the entire compact within 10 to 30 seconds from the lower end to the upper end of each compact. After the molten metal completely permeated the entire molded body, the molded body was separated from the molten metal as shown in FIG. 6, and the molten metal was solidified as it was. In this case, the molten metal remained attached to the molded body due to surface tension until it solidified, and did not substantially drip from the molded body.

Next, when the dimensions of the composite material cylinder thus manufactured were measured, the outer diameter, the inner diameter, and the length were each 40 to 41.
mm, 29 to 30 mm, and 49 to 50 mm, and it was confirmed that each cylindrical body had substantially the same shape and dimensions as the original molded body. Further, when each cylindrical body was cut and its composite state was examined, it was confirmed that the matrix metal was sufficiently filled up to the surface without any excess or shortage in any of the cylindrical bodies.

As described above, according to the present invention, a composite material in which the matrix metal is well filled between the individual reinforcing materials can be efficiently and inexpensively compared with the conventional method without pressurizing the melt of the matrix metal. It will be understood that the present invention can be manufactured, and that a casting made of a composite material having a predetermined shape and dimensions can be manufactured very efficiently and at a high yield without using a mold or the like.

Although the present invention has been described in detail with reference to some embodiments, the present invention is not limited to these embodiments, and various other embodiments are possible within the scope of the present invention. Will be apparent to those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a molded body composed of a reinforcing material and a fine piece of a metal oxide, and FIG. 2 is a composite material manufactured according to the method of the present invention using the molded body shown in FIG. FIG. 3 is an exploded view showing an embodiment, FIG. 3 is a perspective view showing a composite material manufactured by the method shown in FIG. 2, and FIG. 4 is a cylindrical molded body made of a reinforcing material and fine pieces of metal oxide. Perspective view showing the fifth
The figure is an illustrative view showing a state where the lower end of the molded body is immersed in the molten metal of the matrix metal, and FIG. 6 is an illustrative view showing a state where the molded body is pulled up from the molten metal of the matrix metal. 10… compression molding, 12… reinforcement, 14… metal oxide fine piece, 16… mold, 18 …… matrix metal melt, 20…
… Composite material, 24… compression molding, 26 …… reinforcing material, 28 …… metal oxide fine piece, 30 …… folder, 32 …… melt container, 34
...... Molten matrix metal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Atsushi Tanaka 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Yoshiaki Kajikawa 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation ( 72) Inventor Tetsuya Nomi 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-62-107038 (JP, A) JP-A-56-15470 (JP, A) JP-A-49-42504 (JP, A) JP-A-61-210137 (JP, A) JP-A-61-165265 (JP, A)

Claims (1)

(57) [Claims] 1. A reinforcing material selected from the group consisting of inorganic short fibers other than metals, whiskers, particles, and mixtures thereof, and W, Mo, Pb, Bi, V, Cu, Ni, Co, Sn, Mn, B,
Cr, Mg, an oxide of Al, and a fine piece of a metal oxide selected from the group consisting of mixtures thereof to form a molded article substantially uniformly mixed, comprising a compact, A metal matrix composite in which at least a part thereof is brought into contact with a molten metal of a matrix metal selected from the group consisting of Al, Mg, an Al alloy, and an Mg alloy, and the molten metal is penetrated into the formed body without substantially applying pressure. Material manufacturing method.