JPH01279716A - Manufacture of metal-based composite material - Google Patents

Abstract

PURPOSE:To manufacture the title material without pressurizing the molten metal of Al, Mg or the like by immersing a molded body constituted of a reinforcing material of the short fiber, whisker, grains, etc., by specific materials and the fine pieces of specific metals and oxide into the above molten metal. CONSTITUTION:A reinforcing material 12 constituted of Al2O3 short fiber, SiC whisker, Si3N4 grains and their mixture and a molded body 10 formed with the mixture of fine pieces 13 constituted of Ni, Fe, Co, Cr, Mn, Cu, Ag, Si, Mg, Al, Zn, Sn, Pb, Ti, Nb and their alloys and the fine pieces 14 of the oxide of W, Mo, Pb, Bi, V, Cu, Ni, Co, Sn, Mn, B, Cr, Mg, Al, Fe, Si, Zn, Nb, Ta and their mixture is immersed into the molten metal 18 of Al, Mg or their alloys in a vessel 16. The wettability between the molded body 10 and the molten metal is good; the molten metal 18 of the Al alloy, etc., permeates into the molded body 10 and is solidified, by which a fiber reinforcing composite material contg. Al alloy, etc., as the matrix can easily be manufactured without pressurizing the molten metal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to composite materials, and more particularly to the production of metal matrix composite materials in which short fibers, whiskers, or particles are used as reinforcing materials and aluminum alloy or the like is used as a matrix. Regarding the method.

Problems to be solved by conventional techniques and inventions For example, the "Aluminum Composite" paper distributed at the 3rd Metal Forming Seminar held in Atami City from July 15 to 160, 1985, sponsored by the Japan Society of Light Metals. "Formation of feed (FRM)"
As described in the booklet entitled, ■
Diffusion bonding method, ■Plasma spray method, ■Vapor phase deposition method,
■Melt infiltration method, ■Electrodeposition method (plating method), etc.As methods for manufacturing fiber-reinforced metal composite materials whose reinforcing fibers are discontinuous fibers, ■Powder metallurgy method, ■Compocasting method, ■
It is known that there are methods such as molten metal forging method, (1) semi-melt processing method, and (2) HIP method.

Especially when the reinforcing fibers are discontinuous fibers, the molten metal forging method (high-pressure casting method) mentioned above has been generally used since it has superior productivity compared to the other methods mentioned above. It has been adopted. However, in the molten metal forging method, the molten matrix metal must be pressurized to very high pressures, which requires large-scale production equipment, which makes the production of composite materials expensive; This is one of the major impediments to the practical application of the material.

Thus, in the production of composite materials in which the reinforcing fibers are discontinuous, there is a need to reduce the necessary pressure on the molten matrix metal, and even to omit the pressure. In order to achieve this, it is necessary to significantly improve the wettability between the reinforcing fibers and the molten matrix metal.

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

Furthermore, in the case where the reinforcing fibers are continuous fibers, various methods have been proposed for changing the wettability of the fibers with respect to the molten metal of the matrix metal.
Publication No. 42504 describes a method of applying metal powder to the surface of fibers to improve wettability.
JP-A-50-109904, JP-A-52-28433
No., JP-A-53-38791, JP-A-57-1690
No. 36 and Japanese Unexamined Patent Publication No. 57-169037 describe a method of coating the surface of fibers with a metal to thereby improve wettability.

As described in these publications, reinforced 2M all
When the fibers are continuous fibers, the fibers are generally oriented in one direction, so the molten matrix metal penetrates between the individual continuous fibers by capillary action, and therefore, according to the method described above, the fibers and the matrix metal It is possible to improve the wettability between the molten metal and the molten metal.

However, when the reinforcing fibers are short fibers or whiskers, since they are discontinuous, penetration of the molten matrix metal by capillary action cannot be expected. As described in , simply applying methods known to improve the wettability of continuous fibers to short fibers and whiskers cannot sufficiently improve their wettability. Further, when the reinforcing fibers are short fibers or whiskers, it is difficult to cover them with a large amount of metal or apply a large amount of metal powder, and the cost is extremely high. These problems also occur when the surface of the fiber is coated with a metal oxide as described in US Pat. No. 4,376.803 and US Pat. No. 4,569,886.

In addition, Japanese Patent Application Laid-open No. 5
As described in Japanese Patent Application Laid-open No. 7-31466 and Japanese Patent Application Laid-Open No. 62-67133, there is a method in which a reinforcing material molded body is preheated to a predetermined temperature, and then a molten matrix metal is infiltrated into the molded body under pressure. Are known. According to this method, the wettability of the matrix metal with the molten metal is improved by heating the reinforcing material itself to a temperature at which the reinforcing material itself is heated, and the permeability of the matrix metal with the molten metal is improved compared to the case where the molded body is not preheated. . However, in these methods, it is essential to preheat the molded body, and special means are required for that purpose, so these methods also have limitations in streamlining and reducing the cost of manufacturing composite materials. There is.

In addition, Japanese Patent Application Laid-open No. 6, filed by the same applicant as the applicant
As described in Japanese Patent Application No. 1-16526, the reinforcing material is formed by utilizing the redox reaction between the metal oxide contained in the molded material of the reinforcing material and the specific metal element in the matrix metal. Methods are known to improve the permeability of molten matrix metal into the body. However, this method has a problem in that it is not possible to produce a composite material in which the matrix metal is a metal of an arbitrary composition because the elements that undergo redox reactions with each other are limited.

Furthermore, in any of the above-mentioned conventional methods, it is essential to pressurize the molten matrix metal to a relatively high pressure, and therefore, depending on these conventional methods, pressurization of the molten matrix metal may be omitted or However, it is not possible to efficiently and inexpensively manufacture composite materials by omitting the use of molds, etc. necessary for pressurization, and a relatively large amount of matrix metal is removed from the mold in areas other than the molded product each time it is cast. Since solidification is unavoidable, there is a problem in that the yield cannot be improved.

Also, Special Publication No. 59-500973 and April 1985
Journal or Materials published in month
5clance Letters describes a method for producing a composite material in which a reinforcing fiber molded body is pretreated with a fluorine-containing reagent and the molded body is made to contain a molten matrix metal. However, in this method, the reinforcing fibers are limited to those whose main component is carbon or carbide, or whose surface is coated with carbon or carbide, and the processed molded body must be preheated before being impregnated with the molten matrix metal. The problem is that it is necessary to do so.

In view of the above-mentioned problems in conventional composite material manufacturing methods, the inventors of the present application have conducted various experimental studies, and have found that:
It has been found that the above-mentioned problems can be solved by incorporating fine pieces of a specific metal and fine pieces of a specific metal oxide into a molded reinforcing material.

The present invention is based on the knowledge obtained as a result of various experimental studies conducted by the inventors of the present invention, and is based on the knowledge obtained from various experimental studies conducted by the inventors of the present invention. The purpose is to provide a method that can efficiently and inexpensively manufacture materials.

Furthermore, the present invention can produce a composite material having a substantially predetermined shape and size very efficiently and without using a mold for pressurizing a molten matrix metal or a mold for manufacturing a composite material having a predetermined shape. The purpose of this invention is to provide a method that can be manufactured with very high yields in descending order.

SUMMARY OF THE INVENTION According to the present invention, a reinforcing material selected from the group consisting of short fibers, whiskers, particles, and mixtures thereof, and N15FeSCo, Cr, Mn, CuSAg.
5S 15Mg, AI, Zn.

Fine pieces of metal selected from the group consisting of Sn, Pb, Ti, Nb, and alloys containing any of them as a main component;
W, Mo, P b, B i, VSCu.

N L % Co s S n -, M n SB S
Cr % M g s A 1, Fe s S s
s Z n 1 N b s Ta oxide, and fine pieces of a metal oxide selected from the group consisting of mixtures thereof, and at least a portion of the molded body is made of Al, A method for producing a metal matrix composite material, in which the molten metal is brought into contact with a molten matrix metal selected from the group consisting of Mg or an alloy containing Mg as a main component, and the molten metal is infiltrated into the molded body without substantially applying pressure. achieved.

Effects and Effects of the Invention According to the method of the present invention, a molded body containing a reinforcing material, fine pieces of a specific metal, and fine pieces of a specific metal oxide is formed,
At least a portion of the compact is brought into contact with a molten matrix metal. Fine pieces of specific metals as mentioned above have good wettability against elution of aluminum alloys, etc.
In addition, the fine pieces of the above-mentioned specific metal oxide have better wettability with molten metal such as aluminum alloy than other metal oxides, so the molten metal of the matrix metal is The oxide particles permeate into the molded body, and as a result, they come into contact with the reinforcing material in turn, and the molten matrix metal reacts with the specific metal particles and the specific metal oxide particles. fever,
The heat improves the permeability of the molten metal into the molded body and the wettability of the reinforcing material, so that the molten metal of the matrix metal satisfactorily permeates throughout the molded body.

Therefore, according to the method of the present invention, there is no need to pressurize the molten matrix metal or preheat the reinforcing material, and therefore, there is no need for extensive equipment for pressurizing the molten matrix metal or preheat the reinforcing material. Composite materials in which matrix metal is well filled between individual reinforcing materials can be produced more efficiently and at lower cost than conventional methods.

Furthermore, according to the method of the present invention, as described above, the molten metal of the matrix metal satisfactorily penetrates into the molded body, so that the molten metal containing the reinforcing material, the fine pieces of the specific metal, and the fine pieces of the specific metal oxide. If a molded body is formed into a predetermined shape and size and a part of the molded body is brought into contact with the molten matrix metal, the molten matrix metal will quickly penetrate into the entire molded body in just the right amount.
This forms a composite material of substantially predetermined shape and dimensions. Therefore, a mold is required to pressurize the molten matrix metal and define a predetermined product shape, and a large amount of the matrix metal inevitably solidifies in parts of the mold other than the composite material. Compared to forging methods, etc., composite materials of substantially predetermined shapes and dimensions can be efficiently manufactured at a low level with a very high yield.

According to the results of experimental research conducted by the inventors of the present application, if the molded body contains fine pieces of the above-mentioned specific metal and fine pieces of metal oxide, the molded body of the molten metal of the matrix metal The weight ratio of the specific metal fine pieces to the reinforcement is 50% or more, preferably 75% or more, and the weight ratio of the specific metal oxide fine pieces to the reinforcement is 50% or more, preferably 75% or more. When the ratio is 3% or more, preferably 5% or more, the molten matrix metal can satisfactorily penetrate into the molded body. According to one particular feature of the invention, therefore, the amount of specific metal fines in the compact is greater than or equal to 5,026, preferably 7,026 by weight relative to the reinforcement.
The amount of fine particles of the specific metal oxide in the molded body is set to 3% or more, preferably 5% or more in terms of the ff1ffi ratio to the reinforcing material.

Also, according to the results of experimental research conducted by the inventors of the present application,
The metals that make up the specific metal particles are Ni, Fe, and Co.
When using any of 5Cu5S i, Zn5SnSTt, and alloys containing any of them as a main component, the molten metal of the matrix metal can be well penetrated into the molded body. According to another detailed feature of the invention, therefore, the metal constituting the particular metal particles is N L SF e -
, COSCu 5SiSZnSSnSTi, and alloys containing any of them as main components.

Also, according to the results of experimental research conducted by the inventors of the present application,
When the matrix metal is an Al alloy, the Al
When the alloy contains at least 0.5% or more of M g SZ r s Ca in total, the molten metal of the matrix metal can be penetrated into the molded body even better, and this is particularly true. This is effective when the molded body is preheated to improve the wettability of the reinforcing material itself. According to yet another detailed feature of the invention, the matrix metal contains a total of at least 0 of Mg, Zr, and Ca.
．． It is an Al alloy containing 5% or more.

Also, according to the results of experimental research conducted by the inventors of the present application,
Even if the total volume fraction of the reinforcing material, fine pieces of a specific metal, and fine pieces of a specific metal oxide in the molded body is too low or too high, the molten metal of the matrix metal can be properly contained in the molded body. It becomes difficult to penetrate the According to yet another detailed feature of the invention, the total volume fraction of the reinforcing material, the specific metal particles, and the specific metal oxide particles in the compact is 4 to 90%; Preferably it is set to 5 to 85%.

Also, according to the results of experimental research conducted by the inventors of the present application,
Even if the volume fraction of specific metal fine pieces and metal oxide fine pieces contained in the molded body is high, the molten metal of the matrix metal can be well penetrated into the molded body.
As the amount of these increases, the volume fraction of the reinforcing material decreases relatively, and depending on the type of reinforcing material, the composition of the matrix metal changes greatly. Therefore, according to yet another detailed feature of the present invention, the volume fraction of the specific metal fine particles in the compact is preferably set to 85% or less, and the volume fraction of the specific metal oxide fine particles is preferably set to 85% or less. is less than 45%,
Preferably it is set to 40% or less.

According to yet another detailed feature of the invention, the molded body has a predetermined shape and dimensions, and only a portion thereof is immersed in the molten metal of the matrix metal.

According to this method, a composite material of a predetermined shape and size can be efficiently produced at a very high yield without pressurizing a molten matrix metal or using a mold to define a predetermined product shape. Can be manufactured in descending order.

In the method of the present invention, it is not necessary to preheat the molded body, but when preheating the molded body to improve the wettability of the reinforcing material, the temperature should be higher than the temperature conventionally used. The temperature may be low, and a low preheat temperature is also preferred in that it can avoid significant oxidation of certain metal particles. Further, the specific metal fine pieces and the specific metal oxide fine pieces in the present invention may be in any form such as short fibers, fibers, or powder.

In addition, the specification of Japanese Patent Application No. 1983 filed by the applicant on the same date as the present application describes a method of mixing fine pieces of a specific metal into a molded product of reinforcing material.
No. 1, and Japanese Patent Application No. 1983 discloses a method for producing a composite material in which fine pieces of a specific metal oxide are mixed into a molded reinforcing material.

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 As a reinforcing material, short alumina fibers with an average fiber diameter of 3 μm and an average fiber length of 1 μm (manufactured by IC1 [Safil RGJ, 95% A
I 203.5%5i02), fiber diameter 0°1~1.0μ
Silicon carbide whiskers (manufactured by Tokai Carbon Co., Ltd.) with a m1 fiber length of 50 to 200 μm and silicon nitride particles (manufactured by Kojundo Kagaku Co., Ltd.) with an average particle diameter of 10 μm were prepared. In addition, metal fibers and metal powders shown in Table 1 below were prepared as specific metal fine pieces.

Next, ■ the above reinforcing material and oxides (A I 203, Zr
O2, Fe203, CeO2, TiO2, 5nOSC
r203, S t 02) (manufactured by Nissan Chemical Co., Ltd.), compression molding the mixture, and drying the molded product, the reinforcing material, the fine pieces of the metal, and the metal oxide are combined. A molded body consisting of fine pieces of the material was formed.

In addition, ■ the above reinforcing material and average particle size], 5 μm Ta205 powder (Mitsui Kinzoku Co., Ltd. r!A), Nb with an average particle size of 5 μm
2O5 powder (manufactured by Mitsui Kinzoku Co., Ltd.), PBO powder with a particle size of 1 to 2 μm (manufactured by Kojundo Kagaku Co., Ltd.), average particle size of 5 μm
V2o5 powder (manufactured by Kojundo Kagaku Co., Ltd.), average particle size 6
μm Bi2O3 powder (manufactured by Kojundo Kagaku Co., Ltd.), ZnO powder (manufactured by Kojundo Kagaku Co., Ltd.) with an average particle size of 10 μm,
M n O2 powder with a particle size of 1 to 2 μm (manufactured by Kojundo Kagaku Co., Ltd.), 8203 powder with an average particle size of 43 μm (manufactured by Kojundo Kagaku Co., Ltd.), M n O3 powder with an average particle size of 3 μm (manufactured by Japan Shinkin Metal Co., Ltd.) ), W with an average particle size of 0,551t z
O3 powder (manufactured by Nippon Shinkinzoku Co., Ltd.), average particle size 74μ
CO3O4 powder (manufactured by Sumitomo Metal Mining Co., Ltd.) of I, NiO powder (manufactured by Sumitomo Metal Mining Co., Ltd.) with an average particle size of 1.6 μm, and MgO powder (manufactured by Ube Industries, Ltd.) with an average particle size of 0.05 μm, respectively. By mixing in water, compression molding the mixture, and drying the molded body, a molded body consisting of the reinforcing material, fine pieces of the above-mentioned metal, and fine pieces of the above-mentioned metal oxide was formed.

FIG. 1 is a perspective view showing an example of the molded body 10 thus formed, and in the figure, 12 indicates a reinforcing material, 13 indicates fine pieces of metal, and 14 indicates fine pieces of metal oxide. . In this case, the volume fractions of alumina short fibers, SIC whiskers, and Si3N4 particles are 7%, 15%, and 30%, respectively, the weight ratio of fine metal pieces to the reinforcing material is 10%, and the weight ratio of the metal oxide to the reinforcing material is 10%. The weight ratio was 10%, and the total volume ratio was 7.4 to 89.99i6. Each compact also had dimensions of 20 x 20 x 40 mm, and the metal particles and metal oxide particles were substantially uniformly dispersed throughout the compact.

Next, a molded article in which the metal fibers are Zn fiber and Sn fiber,
The molded bodies other than the molded bodies in which the metal powder is PB powder are preheated to 200°C, and then each molded body 10 is placed in a molten metal container 16 as shown in FIG. Molten metals 1 to 8 of the matrix metal at 700°C were poured into the chamber, and the molten metal was solidified without applying pressure. In this case, for the reinforcing materials of alumina short fibers, SiC whiskers, and Si3N4 particles, aluminum alloys (JIS Kirakku AC
4D), a magnesium alloy (JIS standard MC-2), and an aluminum alloy (JIS standard AC4D) were used.

Next, the composite material 20 formed in the original molded body is cut out from each of the solidified bodies produced as described above, and the central part thereof is cut in the transverse direction as shown by the imaginary line 22 in FIG. The quality of each composite material was evaluated by cutting the composite material, polishing the cut surface, and performing physical observation and observation using an optical microscope.

The results of these evaluations show that the reinforcing materials are alumina short fibers, SiC
The cases of whiskers and Si3N4 particles are shown in Tables 2 to 4 below, respectively. In these tables, ◎ indicates that both the macroscopic and microcomplex states are good, Q indicates that the macroscopic complex state is good, and △ indicates that the macrocomposite state is good. This indicates that only a certain degree of compositing has been achieved, and x indicates that no conjugation has been achieved at all (the same applies to Tables 6 to 8, which will be described later).

From Tables 2 and 3, it is clear that regardless of the type and volume ratio of the reinforcing material, the molded body is Ni, FeCo, CrSMn, CuSAg,
is Mg, A 1% ZnSSn, Pbs Tt, N
fine pieces of b, and WSMo, pb.

Bi, VSCu, Ni, Co, Sn, Mn, B.

Cr5Mg, At, Fe, Si, Zn, Nb, Ta
It can be seen that good compositing is achieved when fine particles of the oxide are included.

Furthermore, even when the fine pieces of metal are fine pieces of an alloy containing any of the above-mentioned elements as a main component, or when the fine pieces of metal and the fine pieces of metal oxide are a mixture of the above-mentioned fine pieces, It has been found that good conjugation is achieved.

Comparative Example Molded bodies were made of only the same alumina short fibers, silicon carbide whiskers, and silicon nitride particles as the reinforcing material used in Example 1, and had volume fractions of 5%, 15%, and 50%, respectively. The composite material was manufactured using the same method and conditions as in Example 1 for each molded body. However, good composite formation was not achieved in any of the molded bodies.

In addition, using each of the molded bodies of the above-mentioned comparative examples, composites were made in the same manner and under the same conditions as in Example 1, except that the molten matrix metal was pressurized at various pressures using a high-pressure casting device. An attempt was made to manufacture the material.

As a result, to achieve good compositing, at least 500 kg/mol of matrix metal is required. It was found that it was necessary to apply pressure at two or more pressures.

Example 2 As shown in Example 1 above, it is preferable that the reinforcing material compact contains fine pieces of a specific metal and fine pieces of a specific metal oxide. An appropriate value for the amount of fine particles and metal oxide particles was investigated.

First, a molded body consisting of the reinforcing material, fine metal pieces, and metal oxide fine pieces shown in Tables 5 to 7 below is formed, and the molded body and the matrix metal shown in Table 6.7 are formed. Composite materials were produced using the molten metal in the same manner as in Example 1, and the quality of the composite state of each composite material was evaluated in the same manner as in Example 1.

The weight ratio of fine metal pieces to the reinforcing material is 0% and 25%.
, 50%, 75%, 100%, 150%, 200%, 3
The weight ratio of metal oxide fines to reinforcement is 0%, 1%, 3%, 5%, 7.5%, 10%.
, 15%, and 20%.

The results of these evaluations are shown in Table 6 below when the matrix metal is an aluminum alloy, and in Table 7 when the matrix metal is a magnesium alloy. From Tables 6 and 7, in order to achieve a good composite, regardless of the type of reinforcing material or metal oxide and the composition of the matrix metal, the weight ratio of fine metal pieces to the reinforcing material must be at least 50%. In particular, it is preferably 75% or more, and the weight ratio of the metal oxide fine pieces to the reinforcing material is 3% or more,
It can be seen that it is particularly preferable that the content is 5% or more.

Example 3 As described in the specification of Japanese Patent Application No. 1988 filed on the same date as the present application by the same applicant as the present applicant, Mg5CaSZn in an aluminum alloy as a matrix metal is not reinforced by a non-metal. It has the effect of improving the wettability of materials.

Therefore, the effectiveness of these elements was investigated in the case where fine pieces of metal and fine pieces of metal oxide were mixed into the molded material of the reinforcing material.

As shown in Table 8 below, a molded body made of the same reinforcing material, fine pieces of metal, and fine pieces of metal oxide as in Example 2 was formed, and using these molded bodies, The molded body whose metal fibers are Zn fibers and Sn fibers and the metal powder are PB
A composite material was produced in the same manner as in Example 1, except that the powder compact was preheated to 00°C and the other compacts were preheated to 400°C, and the test was carried out for each composite material. The quality of the composite condition was evaluated in the same manner as in Example 1. In this case, Mg-containing (-j'
JIS standard where melon is 0.1%, 0.3%, 0.5%, 10% respectively)"l5AcIASJ Is Regulation AC4C
SJIS standard AC4D, JIS standard AC7B, and JIS standard AC4C each contain 0.3% Ca and 0.5% Ca.
% Zr and 0.7% Mg were used. The results of these evaluations are shown in Table 8.

From Table 8, when the matrix metal is an aluminum alloy, Mg is 0.5% or more or a total of 0.5% or more. It can be seen that when an aluminum alloy containing 5% or more of MFZSCa or Zr is used, the compositing is performed better.

Although not shown as an example, it has been found that composite formation is even better performed when the aluminum alloy alone contains 0.5% or more of Ca.

Example 4 From the combination of reinforcing material and metal oxide fine pieces in which good composite was achieved in the above-mentioned Example 1 (the combination in which the composite state is all ◎ in Tables 2 and 3) As shown in FIG. A cylindrical molded body 24 having an outer diameter of 40mm, an inner diameter of 30mm, and a length of 50+u was formed as shown in FIG. In addition, in Figure 4, 26.27
and 28 indicate a reinforcing material, a fine piece of metal, and a fine piece of metal oxide, respectively. Further, as matrix metals, molten metals of aluminum alloy (JIS standard AC4D) and magnesium alloy (JIS standard MC-2), which are the same as the matrix metals used in Example 1, were prepared.

Next, each molded body is heated to the same temperature as in Example 1, and then, as shown in FIG. 5, the upper end of each molded body 24 is held with a tweezers-like holder 30, 700'C stored in the molten metal container 32
was brought into contact with a molten metal 34 of matrix metal. Then, the molten metal of the matrix metal permeated the entire molded body from the lower end to the upper end of each molded body within 5 to 20 seconds. After the molten metal has completely penetrated into the entire molded body, as shown in Fig. 6 (
The molded body was separated from the molten metal, and the molten metal was allowed to solidify in that state. In this case, the molten metal remained attached to the molded body due to surface tension until it solidified, and substantially did not drip from the molded body.

Next, when the dimensions of the cylindrical body made of composite material thus manufactured were measured, the outer diameter, inner diameter, and length were each 39 to 4.
11If11128~30rRm, 48~50cm, and each cylinder was found to have substantially the same shape and dimensions as the original molded body.

Further, when each cylinder was cut and the composite state thereof was investigated, it was confirmed that the matrix metal was well filled to the surface of each cylinder without excess or deficiency.

From the above explanation, according to the present invention, it is possible to produce a composite material in which the matrix metal is well filled between individual reinforcing materials without pressurizing the molten metal of the matrix metal, more efficiently and at a lower cost than with conventional methods. It will be understood that composite material castings of predetermined shapes and dimensions can be produced very efficiently, inexpensively, and with high yields without using molds or the like.

In Examples 1, 2, and 4 mentioned above, the molded bodies were not preheated, but it was confirmed that good composite formation could be achieved even when the molded bodies were preheated in these Examples. has been done.

Although the present invention has been described above in detail with reference to several embodiments, 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.

Table 1 Fiber or powder Diameter (μm) Length (m1) Manufacturer N1 fiber 20 1 Tokyo Rope ■ Stainless steel fiber 20 1
T1 fiber 20 1 〃Z mouth fiber 90 3 〃Sn fiber!
I 90 3〃W powder
1.0 Japan New Metal ■Mo powder 5 -〃Ta powder
10 High purity chemical ■Nb powder 3-〃V powder
6-〃Zr powder
74 -〃Co powder 2~
3-〃Mn powder 2-3
-〃S1 powder 43
-/〆Cr powder 2~3
-〃Ag powder 75-
〃Mg powder 75
Fukuda Metal ■PB powder 75 -
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[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a molded body made of a reinforcing material, fine pieces of metal, and fine pieces of metal oxide, and FIG. 2 is a composite of the molded body shown in FIG. An illustration showing how the material is manufactured; Figure 3 is a perspective view showing the composite material manufactured by the method shown in Figure 2; Figure 4 is a diagram showing the reinforcing material, fine metal pieces, and metal oxide. FIG. 5 is a perspective view showing a cylindrical molded body made of fine pieces; FIG.
The figure is an illustration showing the state in which the molded body is pulled up from the molten matrix metal. 10... Compression molded body, 12... Reinforcement material, 13...
Fine pieces of metal, 14...Fine pieces of metal oxide, 16.
... Mold, 18... Molten metal of matrix metal, 20.
...Composite material, 24...Compression molded body, 26...Reinforcement material, 27...Fine pieces of metal, 28...Fine pieces of metal oxide, 30...Holder, 32... Molten metal container, 3
4... Molten metal of matrix metal Fig. 1 18... 1 Ejl of matrix metal Fig. 2 Fig. 3 Kuku Fig. 4 Fig. 6

Claims (1)

[Claims] a reinforcing material selected from the group consisting of short fibers, whiskers, particles, and mixtures thereof; and Ni, Fe, Co, Cr,
Mn, Cu, Ag, Si, Mg, Al, Zn, Sn, P
b, Ti, Nb, and alloys containing any of them as main components; and W, Mo.
, Pb, Bi, V, Cu, Ni, Co, Sn, Mn, B
, oxides of Cr, Mg, Al, Fe, Si, Zn, Nb, Ta, and mixtures thereof. At least a part of Al, Mg, Al alloy, and Mg
A method for producing a metal matrix composite material, which comprises contacting a molten metal of a matrix metal selected from the group consisting of alloys, and allowing the molten metal to infiltrate into the molded body without substantially applying pressure.