JPS62192557A - Metal-base composite material excellent in characteristic of wear by friction - Google Patents

Abstract

PURPOSE:To improve wear resistance of composite material and to reduce the wear loss of opposite materials, by setting up each Moh's hardness, diameter, and volume percentage of a reinforcement and a solid lubricant which are to be compounded with a matrix metal in specific ranges, respectively. CONSTITUTION:The reinforcement (1-40% by volume) selected from short fibers grains,and mixtures thereof having >=6 Moh's hardness and <=30mum diameter and the solid lubricant (3-50% by volume) selected from short fibers, grains, and mixtures thereof having <=4.5 Moh's hardness and <=100mum diameter are compounded with the matrix metal. As the matrix metal, an alloy of Al, Mg, Cu, etc., is used. As the reinforcement, alumina fibers, TiC grains, etc., are used and, as the solid lubricant, a substance selected from oxides, sulfides, nitrides, graphite, etc., for example, BN, WO3, etc., is used. Owing to the above composition, a metal-base composite material reduced in the wear loss of material itself without increasing the wear loss of opposite material can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a composite material, and more particularly to a metal matrix composite material in which a matrix metal is composited with a reinforcing material and a solid lubricant.

Conventional technology In order to improve the specific strength and abrasion resistance of metal materials, M & navy blue reinforced gold am composite material and particle dispersed gold ff11 composite material are compositely reinforced with reinforcing materials such as reinforcing fibers and dispersed particles.
Generally, since the reinforcing material is hard, there is a problem that the amount of wear of the mating material that comes into contact with it and slides relative to it tends to be greater than that of a material made only of matrix metal that is not compositely reinforced with the reinforcing material. There is.

In order to solve this problem, for example, Japanese Patent Application Laid-Open No. 53-1028
No. 24, No. 54-64263, No. 58-93844, No. 58-93845, No. 58-93847, No. 5
No. 8-113335, No. 59-59855, No. 59-
As described in Japanese Patent No. 59856, it is already known to add anti-friction substances having excellent self-r++ slip properties to composite materials. Such a composite material can include a metal material that has superior friction and wear characteristics, that is, both its own wear resistance and its attack resistance against other materials, compared to a composite material that does not contain an anti-friction substance.

Problems to be Solved by the Invention However, according to the results of experimental research conducted by the present inventors, depending on the type of anti-friction substance added and the type of river,
Composite material machining wAI! Not only is it not possible to sufficiently improve the J characteristics, but the I! ! It has been found that the abrasion characteristics, strength, etc. may deteriorate. In other words, some anti-friction substances are suitable for metal-based composite materials and others are not. Therefore, anti-friction substances suitable for composite materials must be selected, and the amount of anti-friction substances must be determined. This does not concern design matters that may be set at will by a person skilled in the art when manufacturing a composite material such as the one described above. ! wArlk
It has been found that in order to obtain a composite material with excellent wear properties, the hardness, size, and volume fraction of the antifriction material and the reinforcing material must be optimally set in relation to each other.

For example, the above-mentioned Japanese Patent Application Publication No. 58-93844M, No. 58-93
In the publications No. 845 and No. 58-93847, it is indicated that particles such as graphite, particles of lead, zinc, tin, etc. may be used as the anti-friction material; Even in the case of , if the diameter is large, the composite material itself becomes brittle and wear particles increase, resulting in an increase in the amount of wear on the composite material and the mating material, and the strength of the composite material also decreases. Furthermore, in the case of particles such as lead, zinc, tin, etc., these particles tend to melt and segregate in the composite material during the production of the composite material, so that sufficient rIJ8! ! No effect is obtained, and it is difficult to sufficiently improve the friction and wear characteristics of the composite material, and the strength of the composite material is also likely to decrease due to segregation.

Furthermore, such problems are noticeable in the melt impregnation method and sintering method that have been commonly used in the production of composite materials.
Composite materials containing these antifriction materials are difficult to successfully produce by these methods.

Also, the above-mentioned Japanese Patent Application Laid-open Nos. 53-103824 and 54-64
No. 263, No. 58-113335, No. 59-5985
When anti-friction substances suitable for composite materials are used, such as the solid lubricants described in Patent Publications No. 5 and No. 59-59856, the hardness of the solid lubricant is below a certain value. In this case, the amount of wear of the composite material itself becomes large (the amount of wear is larger than when no anti-friction substance is included), and the amount of wear of the mating material also increases due to the generation of wear particles. On the other hand, if the hardness of the reinforcing material exceeds a certain value, and the diameter exceeds a certain value, the aggressiveness of the composite material is large, and the composite material is damaged due to the generation of wear particles. The amount of wear on the material itself also increases. Moreover, if the amount of reinforcing material is too small, the hardness of the solid lubricant will be low, and the amount of wear of the composite material will be greater than in the case of a normal composite material without a solid lubricant. Conversely, if the amount of reinforcing material is too large, the aggressiveness of the composite material will not decrease even if the amount of solid lubricant is increased.

Furthermore, solid 1 [if the hardness of the agent exceeds a certain value,
Naturally, the aggressiveness of the composite material increases. Even if the hardness of the solid lubricant is an appropriate value, if the amount is too small, it will not be possible to sufficiently reduce the aggressiveness of the composite material, and conversely, if the solid lubricant is too large, The composite material becomes brittle, the amount of wear of the composite material itself increases, and the amount of wear of the mating material also increases due to the generation of abrasion powder.

The present invention provides a metal matrix composite material that has even better friction and wear characteristics than conventionally known composite materials containing solid lubricants, based on the findings obtained as a result of experimental research conducted by the inventors. It is intended to.

Means for Solving the Problems According to the invention, the object as mentioned above is achieved by the present invention, in which a volume selected from the group consisting of short fibers, particles, and mixtures thereof having a Mohs hardness of 6 or more and a diameter of 30 μl or less Rate 1-4
Solid a with a volume fraction of 3 to 50% selected from the group consisting of 0% reinforcement and short particles, particles, and mixtures thereof having a Mohs hardness of 4.5 or less and a diameter of 100 μm or less
This is achieved by a metal matrix composite material in which a matrix metal is composited with an ff1m agent.

Functions and Effects of the Invention According to the present invention, the Mohs hardness, diameter, and volume fraction of the reinforcing material and the solid WJ lubricant are set within the above-mentioned preferred ranges in relation to each other, so that the present invention, which will be described in detail later, As is clear from the results of experimental research conducted by the inventors, it is possible to create a metal matrix composite material that has superior friction and wear characteristics compared to conventional composite materials.

According to one detailed feature of the invention, a metal selected from the group consisting of aluminum, magnesium, copper, zinc, lead, tin and alloys based on any of these is used as the matrix metal.

According to another detailed feature of the invention, the solid rIJ lubricant is any of oxides, sulfides, nitrides, graphites, and mixtures thereof. In the present invention, suitable oxide solid lubricants include tungsten oxide (WOs), zinc oxide (ZnO), -lead oxide (PbO), and tin oxide (SnO).
Sulfide solid lubricants include molybdenum disulfide (MO8g) and tungsten disulfide (WSz>), and nitride solid lubricants include boron nitride ( There is a BN).

According to yet another detailed feature of the invention, the diameter of the reinforcing material is set to 20 μm or less, and the Mohs hardness and diameter of the solid lubricant are set to 4 or less and 50 μm or less, respectively.

According to yet another detailed feature of the present invention, the Mohs hardness and diameter of the reinforcing material are set to 7 or more and 20 μl or less, respectively, and the Mohs hardness, diameter, and volume fraction of the solid lubricant are set to 3 or less and 50 μl, respectively. Hereinafter, it is set to 5 to 40%.

According to yet another detailed feature of the invention, the volume fraction of the solid lubricant is set at 10-40%.

In addition, it is preferable that the short fibers of the reinforcing material and the solid lubricant in the composite material of the present invention have lengths II and II of approximately 10 μm to 5 C−. Furthermore, according to the results of experimental research conducted by the present inventors, when the reinforcing material or the solid lubricant is short fibers, if they satisfy the requirements of the present invention, the orientation of the short fibers is Regardless, the amount of wear on the composite material and the mating material can be reduced. Therefore, the orientation of the short fibers may be any one of unidirectional orientation, two-dimensional random orientation, and three-dimensional random orientation.

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 A study was conducted to find out what hardness is suitable for reinforcing fibers.

First, as shown in Table 1 below, fibers Al-A3 having various Mohs' hardnesses were prepared. Next, each fiber and BN particles were mixed at a volume ratio of 2=3, and the mixture was stirred in colloidal silica. Next, by compression molding the colloidal silica in which the fibers and particles obtained in this manner are uniformly dispersed, the reinforcing fibers M2a and the BN particles 2b are uniformly mixed with each other to form a 80×80×20 m+1 colloidal silica, as shown in FIG. A molded body 1 having dimensions was formed.

Next, after preheating the molded body to 500'C, it is placed in the mold cavity 4 of the mold 3 as shown in FIG. 111185 and pour the molten metal into mold 3.11! 150 by the matching plunger 6
The pressure was increased to 0 kg/II2, and the pressurized state was maintained until the molten metal completely solidified. Thus, as shown in FIG. 3, a cylindrical solidified body 7 with an outer diameter of 11Q+++s1 and a height of 5Qmni is cast, and the solidified body is subjected to heat treatment Tr, and from each solidified body substantially three-dimensionally randomly A composite material 1'' made of an aluminum alloy composited with oriented reinforced mN with a volume fraction of 10% and BN particles with a volume fraction of 15% was cut out, and block specimens A1 to A5 for wear tests were obtained from each composite material. Created by machining.

Next, each block test piece was sequentially set in the m abrasion tester, and the mating member spheroidal graphite cast iron (JrS standard FCD7
0. Hv-250) and chrome steel (J ISMIF48
Cr 20, HV-720) (7) was brought into contact with the outer peripheral surface of a cylindrical test piece, and the contact area of the test piece was heated to room temperature (20°C).
) while supplying castle motor oil 5W-30>, contact surface pressure 20kg/ll112) sliding speed 0
．． A wear test was conducted in which the cylindrical specimen was rotated for 1 hour at 3a+m/sec.

The results of these wear tests are shown in FIG. 4, respectively. In Figure 4 (and the diagram showing the results of other simulated wear tests), the upper half shows the wear amount (wear scar depth μ) of the block test piece.
The lower half represents the wear ff1 (1'fl! wear reduction ff1llll (J)) of the cylindrical test piece, which is the mating material.The white bar graph and the hatched bar graph represent spheroidal graphite, respectively. Shows the results of wear tests using cast iron and chromium steel as mating materials.

From Figure 4, it can be seen that when the Mohs hardness of the reinforcing fiber is 6 or more, regardless of whether the mating material is spheroidal graphite cast iron or chrome steel,
It can be seen that the wear loss of both the composite material and the mating material becomes a small value.

Example 2 A study was conducted to find out what hardness is suitable for particles as reinforcing materials (hereinafter referred to as reinforcing particles).

First, reinforcement particles B as shown in Table 2 below! ~B4
prepared. Next, these particles and graphite particles were mixed in a ratio of 3:4.
The mixture was used to produce a composite material in which the volume percentages of reinforcing particles and graphite particles were 15% and 20%, respectively, in the same manner and conditions as in Example 1. , block specimen 8+=8 from those composite materials
Example 1
A wear test was conducted using the same procedure and conditions as in the case of . The results of these wear tests are shown in FIG.

From FIG. 5, it can be seen that even when the reinforcing material is a particle, when the Mohs hardness is 6 or more, the wear value of the composite material and the mating material becomes small.

Example 3 A study was conducted to determine what hardness would be suitable as a solid lubricant.

First, solid rjJ as shown in Tables 3 and 4 below
Ifl agents C+ to Ca(D+-De)tr were prepared.

Next, each solid rA abrasion C1 to C6 and alumina fiber are 1
:1 volume ratio, the matrix metal meets JIS
The volume fraction of the solid lubricant and alumina fiber was maintained under the same g1 area and conditions as in Example 1, except that the aluminum alloy of standard AC1A <tS temperature 720°C> was replaced and the heat treatment was changed to T6. Composite materials having a concentration of 15% in both cases were manufactured, block test pieces C+-Ca were created from each composite material, and abrasion tests were conducted on each block test piece in the same manner and under the same conditions as in Example 1. The results of these wear tests are shown in FIG.

In addition, in the above case, as shown in Table 4 below, block specimen D+-D was prepared in the same manner and under the same conditions except that the reinforcing material was replaced with titanium carbide particles.
A wear test was conducted regarding θ in the same manner and under the same conditions as in Example 1. The results of these wear tests are shown in FIG.

From FIG. 6 and FIG. 7, the Mohs hardness of the solid lubricant is 4.
It can be seen that when it is 5 or less, preferably 3 or less, the amount of wear of the composite material and the mating material becomes small.

Example 4 A study was conducted to find out what diameter is suitable for the reinforcing material.

First, reinforcing materials E1 to E9 as shown in Table 5 below were prepared. Next, the volume ratio of the reinforcing material and the graphite particles were each 1 in the same manner and under the same conditions as in Example 1, except that the reinforcing material and the graphite particles were mixed at a volume ratio of 2:3.
0% and 15% composite materials were manufactured, block test pieces E1 to Es were created from each composite material, and a wear test was conducted on each block test piece in the same manner and conditions as in Example 1. . The results of these wear tests are shown in FIG.

From Figure 8, regardless of whether the reinforcing material is fibers or particles, the diameter of the reinforcing material is 30 μm or less, preferably 20 μm.
It can be seen that the amount of wear of the composite material and the mating material becomes smaller when the value is + or less.

Example 5 A study was conducted to determine what diameter is suitable for the solid #1 lubricant.

First, solid lubricants F1 to F as shown in Table 6 below.
I prepared 9. Next, solid lubricant and alumina fiber
:3 volume ratio, and J as the matrix metal.
AS standard AC7B aluminum alloy (11690℃)
A composite material with a solid lubricant and alumina fiber volume percentage of 20% and 15%, respectively, was prepared in the same manner and under the same conditions as in Example 1, except that the heat treatment was replaced with 4. Manufactured and block test pieces F+ from each composite material
-F9 were prepared, and a wear test was conducted on each block test piece in the same manner and under the same conditions as in Example 1. The results of these wear tests are shown in FIG.

From Figure 9, regardless of whether the solid lubricant is particles or fibers, when the diameter of the solid lubricant is 100μm or less, preferably 50μm or less, the amount of wear on the composite material and the mating material is reduced. I understand.

Example 6 A study was conducted to find out what value is appropriate for the volume fraction of the reinforcing material.

First, silicon carbide whiskers GI=Gq shown in Table 7 below and tungsten carbide particles H! shown in Table 8 are used as reinforcing materials. ~H9 has been prepared. These Iam and particles were then mixed with graphite particles and 8N particles shown in Tables 7 and 8, respectively, at various volume ratios, and the mixture thus obtained was used in the same manner as in Example 1. Block test pieces 01 to G9 and H+-Hs were created under the following conditions. In addition, block test specimens Go (and Ho) were prepared consisting only of matrix metal without reinforcing material and solid RJJ lubricant. Next, Example 1 was performed on these block test pieces.
A wear test was conducted using the same procedure and conditions as in the case of . The results of these wear tests are shown in FIGS. 10 and 11, respectively. Note that FIGS. 10 and 11 show the results of wear tests using spheroidal graphite cast iron and chromium steel as mating materials, respectively.

From Figures 10 and 11, regardless of whether the reinforcing material is fibers or particles, when the volume fraction of the reinforcing material is 1 to 40%, the wear m of the composite material and the mating material becomes a small value. I understand what will happen.

Example 7 An appropriate value for the volume fraction of the solid lubricant was investigated.

First, graphite particles ■ as shown in Table 9 below! ~■9
prepared. Next, these graphite particles and alumina fibers were mixed at various volume ratios, and block test pieces were prepared using the mixture in the same manner and under the same conditions as in Example 1. 1 to ■9 were created. In addition, block test piece 1 made only of matrix metal without reinforcing material and solid lubricant
o was created. Next, abrasion tests were conducted on these block test pieces in the same manner and under the same conditions as in Example 1. The results of these wear tests are shown in FIGS. 12 and 13. Note that FIGS. 12 and 13 show the results of wear tests using spheroidal graphite cast iron and chromium steel as mating materials, respectively.

From Figures 12 and 13, the volume fraction of the solid lubricant is 3~
It can be seen that when the ratio is 50%, the wear amount of the No. 18 material and the mating material becomes a small value.

Example 8 A study was conducted on the friction and wear characteristics of a composite material containing two types of reinforcing materials or solid lubricants.

In the same manner and article 4'l as in Example 1 above,
A composite of alumina-silica fibers (A4 in Table 1) with a volume fraction of 10%, silicon carbide particles (Ep in Table 5) with a volume fraction of 5%, and graphite particles (Table 2) with a volume fraction of 15%. A block test piece J made of aluminum alloy (Jrs standard 118AC8A) was prepared. Similarly, alumina fiber M with a volume percentage of 5% (A3 in Table 1), potassium titanate voice force with a volume percentage of 10% (04 in Table 3), and BN particles with a volume percentage of 15% (Table 1) A block test piece K made of a composite aluminum alloy (J■S standard AC8A) was prepared.

In addition, for the purpose of comparison, a block test piece J', which is the same as block test piece J except that it does not contain graphite particles as a solid lubricant, was prepared, and a block test piece J' was prepared which was the same as block test piece J except that it did not contain graphite particles as a solid lubricant. ′ was made on a block test piece that was the same as the block test piece except that it was not included.

Next, abrasion tests were conducted on these block test pieces in the same manner and under the same conditions as in Example 1. The results of these wear tests are shown in FIG.

From FIG. 14, it can be seen that solid r! It can be seen that the wear edges of itself and the mating material become smaller values compared to a composite material that does not contain a lubricant.

Example 9 The (1!) friction and wear characteristics of composite materials whose matrix metals are magnesium alloys, zinc alloys, lead alloys, tin alloys, and copper alloys were investigated.

First, alumina with a volume ratio of 30% was prepared in the same manner as in Example 1, except that the temperature and pressure of the molten matrix metal were set to 690°C and 1000k (+/c1), respectively. Fiber (A3 in Table 1) and volume ratio 10
A block test piece L+ was prepared from a magnesium alloy (JIS standard MDC1-A) composited with % graphite particles (Table 2).

In addition, hot water and pressure are 500℃ and 1000k, respectively.
Tungsten carbide particles with a volume fraction of 40% (Es in Table 5) and BN particles with a volume fraction of 20% (Table 1 ) Composite zinc alloy (J 18MI
A block test piece Ml consisting of ZDC1) was prepared.

Also, the hot water temperature and pressure are 410℃ and 1000kg, respectively.
/C1112, alumina-silica fiber (A4 in Table 1) with a volume ratio of 20% and BN with a volume ratio of 50% were prepared in the same manner and under the same conditions as in Example 1 above.
A block test piece N1 was prepared from a lead alloy (JIS standard WJ8) composited with particles (Table 1).

Also, WAm and pressurizing force are each 330'C11°Oo
kg/C1, silicon carbide particles with a volume percentage of 5% (Eg in Table 5) and potassium titanate voice force with a volume percentage of 5% were prepared in the same manner and under the same conditions as in Example 1. (04 in Table 3) Composite tin alloy (J
A block test piece 01 consisting of IsM grade WJ2) was prepared.

Furthermore, silicon nitride voice force (Tateho Chemical Industry Co., Ltd. % Formula % 99% or more Si*N4, particle size 150 μn + particle ato on iX, 1 wt% or less), BN particles (Table 1), and copper alloy (Cu-10 wt% Sn ) The volume fraction of powder, silicon nitride, and BN particles is 1% and 3%, respectively.
A small amount of ethanol was added to the mixture, and the mixture was mixed using a stirrer for about 30 minutes. After drying the mixture thus obtained at 80°C for 5 hours, a predetermined amount of the mixture was filled into a mold, and the mixture was compressed with a punch at a pressure of 4000 kg/C-2 to form a plate. It was molded into. Next, the plate was sintered by heating it at 770°C for 30 minutes in a batch type sintering furnace set to a decomposed ammonia gas (fi point -30"C) atmosphere, and then placed in a cooling zone in the sintering furnace. A composite material was manufactured by slowly cooling the composite material, and a block test piece P+ was created from the composite material.

In addition, for the purpose of comparison, block test pieces Lo to Pa were prepared from materials made only of the matrix metal of the composite materials of the above-mentioned block test pieces L+ to P1, respectively.

These block test pieces were then subjected to wear tests using cylindrical test pieces made of spheroidal graphite cast iron and chromium steel as mating members in the same manner and under the same conditions as in Example 1. The results of these wear tests are shown in Tables 10 and 1 below, respectively.
Shown in 1. In these tables, the wear amount ratio of the block test piece is the wear amount of block test pieces 1 to P1 (wear scar depth μ■) to the wear amount of test piece Lo=Po.
The upper and lower numbers of the wear amount of the cylindrical test piece are for the block test piece L+--P, respectively.

The wear of the cylindrical test piece rubbed with ~Pa is ff1 (+! i 玲 decrease -〇).

From Tables 10 and 11, even when the matrix metal is a magnesium alloy, zinc alloy, lead alloy, tin alloy, or copper alloy, the Mohs hardness, volume fraction, etc. of the reinforcing material and solid lubricant are within the scope of the present invention. 8, it can be seen that the amount of wear of the composite material can be significantly reduced without substantially increasing the amount of wear of the mating material compared to a material made of only a matrix metal.

In the following, the present invention has been explained in detail in relation to the experimental research conducted by the inventors of the present invention, but the present invention is not limited to these examples. It will be apparent to those skilled in the art that a variety of other embodiments are possible within the scope.

Table 10 Table 11

[Brief explanation of drawings]

Figure 1 is a perspective view showing a molded body made of reinforcing fibers and BN particles uniformly mixed with each other, and Figure 2 is a composite material manufactured by high-pressure casting using the molded body shown in Figure 1. Fig. 3 is a perspective view showing the solidified body formed by the high-pressure & I-forming process shown in Fig. 2, and Fig. 4 is an illustration showing the casting process of aluminum alloy composited with various reinforcing fibers and BN particles. Figure 5 is a graph showing the results of an abrasion test conducted on a composite material made of an aluminum alloy composited with various reinforcing particles and graphite particles. Figure 6 is a graph showing the results of wear tests conducted on composite materials made of aluminum alloys made of various solid lubricants and alumina fibers, and Figure 7 is a graph showing the results of wear tests conducted on composite materials made of aluminum alloys made of various solid lubricants and titanium carbide. A graph showing the results of wear tests conducted on composite materials made of composite aluminum alloys. Figure 8 shows composite materials made of aluminum alloys composited with reinforcing fibers and reinforcing particles of various diameters and graphite particles. Figure 9 shows the results of wear tests carried out on a composite material made of an aluminum alloy composited with solids of various diameters, 11 quenching agents, and alumina fibers. The graphs, Figures 10 and 11 show aluminum alloys composited with various volume fractions of silicon carbide voice force and graphite particles, and aluminum alloys composited with various volume fractions of tungsten carbide particles and BN particles. Figures 12 and 13 are graphs showing the results of wear tests conducted using spheroidal graphite cast iron and chrome steel, respectively, for composite materials made of composite materials made of graphite particles and alumina fibers with various volume percentages. Figure 14 is a graph showing the results of wear tests conducted on composite materials made of aluminum alloys using spheroidal graphite cast iron and chromium steel as counterpart materials, respectively. Composite material made of aluminum alloy,
The results of wear tests conducted on a composite material made of an aluminum alloy blended with alumina fibers, potassium ditanate voica, and BN particles were also carried out on a composite material as a comparative example that did not contain a solid lubricant. It is a graph shown in comparison with the results of a wear test. 1... Molded body, 1'... Composite material, 2a... Reinforced mN. 2b... BN particles, 3... Mold, 4... Mold cavity, 5... Molten metal, 6... Plunger, 7...
...Coagulant tube Applicant: Toyota Motor Corporation Representative: Patent Attorney Masatake Akashi Figure 1 Figure 3 Figure 2 Figure 5

Claims (1)

[Scope of Claims] (1) A reinforcing material with a volume percentage of 1 to 40% selected from the group consisting of short fibers, particles, and mixtures thereof having a Mohs hardness of 6 or more and a diameter of 30 μm or less, and a Mohs Short fibers with a hardness of 4.5 or less and a diameter of 100 μm or less,
A metal matrix composite material in which a matrix metal is composited with a solid lubricant with a volume ratio of 3 to 50% selected from the group consisting of particles and mixtures thereof. (2) In the metal matrix composite material of claim 1,
The matrix metal is aluminum, magnesium,
A metal matrix composite material characterized in that it is a metal selected from the group consisting of copper, zinc, lead, tin, and alloys containing any of these as main components. (3) In the metal matrix composite material according to claim 1 or 2, the solid lubricant is any one of oxides, sulfides, nitrides, graphite, and mixtures thereof. Characteristic metal matrix composite material. (4) In the metal matrix composite material according to any one of claims 1 to 3, the reinforcing material has a diameter of 20 μm or less, and the solid lubricant has a Mohs hardness and a diameter of 4 or less, respectively. , 50 μm or less. (5) In the metal matrix composite material according to any one of claims 1 to 3, the Mohs hardness and diameter of the reinforcing material are 7 or more and 20 μm or less, respectively, and the solid lubricant has a Mohs hardness of 7 or more and a diameter of 20 μm or less, and Hardness, diameter, and volume ratio are each 3 or less and 50μ
A metal matrix composite material characterized in that it is 5 to 40% less than m. (6) In the metal matrix composite material of claim 5,
A metal matrix composite material, wherein the solid lubricant has a volume percentage of 10 to 40%.