JPS61207537A - Combination of members - Google Patents

Abstract

PURPOSE:To obtain combination of members superior in wear resistance, by forming one surface part of sliding members in contact with each other with metal contg. specified alumina fibers and mineral fibers, and the other surface part with steel having a specified hardness. CONSTITUTION:One surface part of sliding members in contact with each other is formed by incorporating hybrid fibers composed of alumina fiber contg. >=80wt% Al2O3, and the balance SiO2 substantially, and mineral fibers contg. SiO2, CaO, Al2O3 as main constituent, <=10wt% MgO, <=5wt% Fe2O3, <=10wt% the other inorganic material under <=20wt% and <=7wt% total quantity of nonfiber particles and particles having <=150mu diameter respectively, into matrix metal selected from Al, Mg, Cu, Zn, Sn and alloy composed mainly of these by >=1vol%. Alumina fibers in hybrid fibers are regulated to 5-80vol%, and the other surface part is formed with steel having >=200 Hv (10kg) hardness.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF APPLICATION IN THE IFL INDUSTRY The present invention relates to a combination of two members that abut each other and slide relative to each other, and more particularly, one member is made of reinforced alumina fibers and mineral fibers. It relates to a combination of two members, one made of a composite material made of fibers and the other made of steel.

BACKGROUND OF THE INVENTION Special mechanical properties are often required in parts of the components and members of various machines. For example, in automobile engines, demands for engine performance are high (as the demands for engine performance become higher), members such as pistons must not only have excellent specific strength and rigidity, but also have excellent wear resistance in their sliding motion. As a means of improving the specific strength and wear resistance of such paving members, it is possible to strengthen these members with various inorganic fibers, etc., and to strengthen them with metals such as aluminum alloys. Attempts have been made to construct the device using a composite material with a matrix of

As one of such fiber-reinforced metal composite monthly interest rates, a patent application filed in 1986 filed by the same applicant as the present applicant.
In this issue, alumina fiber and mineral fiber are used as reinforcing fibers,
Fiber-reinforced metal composites with matrix materials such as aluminum alloys are already available. According to such a fiber-reinforced metal composite material, it is possible to improve the specific strength, abrasion resistance, etc. of the part H composed of these materials, and it is possible to improve the specific strength, abrasion resistance, etc. of the part H composed of these materials, and also to improve the alumina fibers, etc. with reinforcing fibers. It is possible to obtain a composite material with a lower order than that of the composite material 31.

Problems to be Solved by the Invention However, in a combination of two members that come into contact with a bean holder and slide relative to each other, when one of the members is made of the above-mentioned fiber-reinforced metal composite material, Depending on the material of the other member, the wear of the other member increases significantly, and therefore, these members cannot be used as a combination U of sliding members that abut each other and slide relative to each other.

The present inventors have proposed a combination of two members that abut each other and slide relative to each other, one of which is an alumina fiber body with excellent strength and rigidity, and a material that is significantly lower than alumina fiber. In a combination of members made of a fiber-reinforced metal composite material in which the mineral 11H is reinforced with 41M and the metal such as aluminum alloy is made with 71~Rix, and the other member is made of steel, In order to minimize the amount of wear on both of these parts, we conducted various experimental studies to find out what combination of materials and properties would be appropriate. I found that LJ must be something that has a property.

The present invention is based on the knowledge obtained as a result of the above-mentioned experimental research conducted by the inventors of the present application, and the present invention is based on the knowledge that one member is made of alumina 41 navy blue and mineral fibers with reinforcing fibers (a metal such as aluminum alloy is used as a matrix). It is a combination of two members made of fiber-reinforced metal composite material, the other part of which is made of steel, which abut each other and slide relative to each other. On sliding surfaces against others [
) The objective is to provide a combination of two parts with improved wear characteristics.

Means for Solving the Problems According to the present invention, the above-mentioned object is achieved by combining a first member and a second member that abut against each other and slide relative to each other. At least the sliding surface portion with respect to the second member of the S! 0
2, CaO, Al2O3 as main components and MIJO content of 10. wt% or less and Fe2O3 content is 5wt
% or less and the content of other inorganic substances is 1Qwt% or less, and the total amount of non-fibrous particles contained in the aggregate and the content of non-fibrous particles with a particle size of 150μ or more are fine. Each 20W [% or less, 7. The reinforcing fiber is a hybrid fiber consisting of a mineral fiber of less than wt%, the matrix metal is a metal selected from the group consisting of aluminum, magnesium, copper, zinc, lead, tin, and alloys containing these as main components, and the above-mentioned It is composed of a composite material with a volume percentage of hybrid fibers of 1% or more,
At least the sliding surface of the second member with respect to the first member has a hardness achieved by a combination of members characterized in that the hardness is made of steel with a 10k (1) of 200 or more. Ru.

Effects and Effects of the Invention According to the present invention, in the composite material constituting the sliding surface portion of the first member, alumina fiber is hard and stable, and alumina fiber is different from that of alumina fiber. The matrix metal is reinforced at a volume ratio of 1% or more by hybrid fibers made of mineral fibers that have good wettability with the molten metal and are less susceptible to deterioration due to reactions with the molten metal. The total amount of fibrous particles □ and the content of non-fibrous particles with a particle size of 150μ or more are maintained at 20'w't% or less and 7wt% or less, respectively, and the sliding surface portion of the second member has a hardness Hv ( 10kg) is made of steel of 200 or more, so it is a combination of two members that contact each other and slide relatively, and the sliding surface of both members relative to each other is It has excellent wear resistance, so it is possible to minimize the amount of wear on the sliding surfaces of both parts and avoid abnormal wear caused by particles falling off. Furthermore, one of the members has excellent mechanical properties such as specific strength and rigidity, and machinability, making it possible to combine the members with low-quality materials.

In general, aluminum-based silica fibers are broadly classified into l) lumina fibers and alumina-silica fibers in terms of their composition and manufacturing method. △1203 content is 70wt% or more and S!
02 So-called alumina fibers with a content of 30 wt% or more are manufactured by forming fibers with a mixture of a refined steel solution and an inorganic aluminum salt, and then oxidizing and roasting the fibers at high temperatures. There is. Darning alumina fibers are especially made of Al2O3.
It is stable when the content is 80 wt% or more, and :/1
~ There is little reaction to molten metal and the resulting deterioration of the fibers. Therefore, in the compound monthly interest rate of the present invention, B□wt%
Alumina fibers having a composition of Al2O3 and the remainder substantially SiO2 are used.

As previously mentioned, alumina has a divine crystal structure, and among these, alpha alumina is known to have the most stable in-4F4 structure, and to have high hardness and elastic modulus. For example, alumina fiber, which is commercially available as a heat-resistant material, has a heat resistance of 1
From the point of view of stability and stability, the α-alumina content (the ratio of the weight of α-alumina to the total weight of alumina in the alumina fiber) is often 60 wt% or more1. Judging from the properties of α-alumina and alumina fibers containing α-alumina, composite material 1131 in which α-alumina-containing alumina fibers are reinforcing fibers and aluminum alloy etc. are 71 helix metals contains α-alumina. The higher the rate, the more the mechanical strength of the composite moon II itself,
Although rigidity, wear resistance, etc. are improved, the amount of wear on the mating member increases and workability is likely to decrease.

However, according to the results of experimental research conducted by the present inventors, contrary to the above-mentioned predictions, when the α-alumina content of the alumina fiber is in the range of 5 to 60 wt%, especially in the range of 10 to 50 wt%, It should be noted that the wear resistance and workability of the composite TRA can be improved, and the amount of wear on the mating part I can be reduced, and the above range is also favorable for mechanical properties such as fatigue strength. The fact was acknowledged. According to one particular feature of the invention, therefore, the alpha alumina content of the alumina fibers is between 5 and 6 wt%, preferably between 10 and 50 wt%.

On the other hand, mineral l1i1t is rock wool (rock fiber), which is formed by melting the fibers and turning them into U&silk.
A general term for artificial fibers such as slag wool (slag fiber), which is formed by converting iron slag into mYt, and mineral wool (mineral fiber), which is formed by melting a mixture of rock, slag, etc. Yes, generally 35-50wt%Si02.2C)~
40wt%Cab, 10~20W1%Δl 20a,
3~7wt%Mo0,1=5wt%Fe 203.0
It has a composition of ~10 wt % So(7) et al.'7) No substances.

Such mineral fibers are generally produced by a method such as a spinning method, and therefore, in the production of -C mineral fibers, non-fibrous particles are inevitably produced along with the fibers. Such non-fibrillated particles are always hard and extremely large compared to the diameter of the composite material, which deteriorates the workability of the composite material, reduces the mechanical properties of the composite material, and makes it difficult to contact the composite material. Excessive wear of the mating members that slide relative to each other, or even non-Di 441
When the particles fall off from the 7-trix metal, they cause problems such as scuff ink on the mating member.

According to the results of experimental studies conducted by the inventors of the present application, the above-mentioned disadvantages are particularly noticeable when the particle size of the non-fibrous particles is 150 μm or more. Therefore, when combining silk with the member of the present invention, the total amount of non-fibrous particles contained in the aggregate of minerals and miscellaneous materials is suppressed to 20 wt% or less, preferably lQwt% or less, and the particle size is 150 μ or more. The content of non-fibrous particles is suppressed to 7 wt% or less, preferably 2 wt% or less.

Also, according to the results of experimental research conducted by the inventors of the present application,
In composite materials, the reinforcing fibers are hybrid fibers made of alumina fibers and mineral fibers, and the matrix metals are aluminum, magnesium, copper, zinc, lead, tin, and alloys containing these as main components. Even if the volume fraction of hemp is about 1%, the abrasion resistance of the composite material is significantly improved, and even if the volume fraction of the hybrid fiber is increased further, the amount of wear on the mating material will not increase. Therefore, in the combination of members of the present invention, the volume fraction of the hybrid fiber is 1% or more, particularly 2% or more, and historically 4% or more.

Also, according to the results of experimental research conducted by the inventors of the present application,
As will be explained in detail later, the effect of improving the wear resistance of the composite material by combining alumina fibers and mineral fibers into a hybrid covering is as follows: Hybrid I! i When the volume ratio of alumina fiber in navy blue is 5 to 80%, especially 10 to 60%
Therefore, according to another detailed feature of the invention, the volume proportion of alumino fibers in the hybrid fibers is between 5 and 80%, preferably between 10 and 65%.

Also, according to the results of experimental research conducted by the inventors of the present application,
When the volume ratio of alumina fiber in the hybrid fiber is relatively small and the volume ratio of mineral fiber is relatively high, for example, when the volume ratio of alumina fiber in the hybrid fiber is 5 to 40%, the volume ratio of the hybrid fiber is 2%, especially 4
It is difficult to ensure sufficient wear resistance of the composite material unless the volume percentage of the hybrid fiber is 35% or more.
In particular, if it exceeds 40%, the bullet hole and wear resistance of the composite material will deteriorate. According to yet another detailed feature of the invention, the volume fraction of alumina fibers in the hybrid fibers is therefore between 5 and 40%, in particular between 10 and 40%; the volume fraction of the hybrid fibers is between 2 and 40%; Preferably it is 4 to 35%.

Also, according to the results of experimental research conducted by the inventors of the present application,
Regardless of the volume ratio of alumina fiber in the hybrid fiber, the volume ratio of mineral fiber is 20%.

In particular, when it exceeds 25%, the bullet hole and wear resistance of the composite material decreases. Therefore, according to yet another detailed feature of the invention, irrespective of the volume ratio of alumina 1II navy blue in the hybrid fibers, the volume fraction of mineral fibers is not more than 25%, preferably not more than 20%. .

Furthermore, if the mixing state of alumina fibers and mineral fibers is non-uniform, the bullet holes and abrasion resistance of the composite material tend to be non-uniform. According to yet another detailed feature of the invention, the aluminum fibers and mineral fibers in the hybrid fibers are therefore substantially homogeneously mixed with each other.

In order to obtain a composite material that has excellent mechanical properties such as strength and abrasion resistance as a constituent material of one member, and also has excellent scratch resistance against the other material, the alumina fiber was According to the results of experimental studies, average fiber diameters of 1.5-5°0μ and 20μ-3.
It has an average fiber length of 1IllIl, and in the case of long fibers it has an average fiber length of 3
It is preferred to have a fiber diameter of ~30μ. On the other hand, mineral fibers have a relatively low viscosity in the molten state of the minerals that constitute their constituent materials, and mineral fibers are relatively weak compared to alumina fibers, etc., so mineral fibers have a fiber diameter of 1 to 10
It is produced in the form of short fibers (discontinuous fibers) with a fiber length of 10μ to about 10C8l. Therefore, considering the low availability of mineral fibers, the average fiber diameter of the mineral fibers used in the member combination of the present invention is about 2 to 8 μm, and the average fiber length is about 20 μ to 5 cm. It is preferable. Also, considering the manufacturing method of composite materials, the average string length of mineral fibers is 100μ to 5c++ in the case of pressure casting method.
In the case of powder metallurgy, it is preferable that the thickness is between 20μ and 2IllIIl.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention will be explained in detail below by way of example embodiments with reference to the accompanying figures.

Example 1 Alumina fiber (trade name "Denka Arsene", 80V1j% Al 20a, 20wt, manufactured by Denki Kagaku Kogyo Co., Ltd.)
%3i02) is subjected to grain removal treatment to reduce the content of particles with a particle size of 150μ or more contained in the fiber aggregate to 0.05wt%.
By doing so, alumina fibers shown in Table 1 below were prepared.

Also, J is Walter shown in Table 2 below
Mineral fiber l/11 manufactured by Re5sources (product name [
PMF” (Processed Mineral
By performing granulation treatment on Fiber),
Total amount and particle size of non-textured particles contained in fiber aggregate 1
The content of particles larger than 50 μ is 2.5 wt%, Q,
It was set to 1w1%.

Next, the above-mentioned alumina fibers and mineral fibers are dispersed in colloidal silica at various volume ratios, and the colloidal silica is stirred to uniformly mix the alumina fibers and mineral fibers, thus forming the alumina fibers and mineral fibers.
As shown in Figure 1, the size is <80x80x20mm by vacuum forming method from colloidal silica in which * is uniformly dispersed.
By forming a fiber forming body 1 and further firing it at 600°C, individual alumina fibers 2 and mineral fibers 2a
were combined with silica. In this case, as shown in FIG. 1, individual alumina fibers 12 and mineral regions! 2a is X
In the -V plane, they were oriented randomly and stacked in two directions.

Next, as shown in FIG.
1500 kg/IX! by the plunger 6 which pours the molten metal 5 of C8A) and fits the molten metal into the mold 3! ! The pressurized state is maintained until the melt 15 is completely solidified, and the outer diameter 11011 is increased as shown in FIG.
1111, a cylindrical solidified body 7 with a height of 50 #1lIl is cast, and the solidified body is further subjected to heat treatment TI to produce a composite material from each solidified body, which has alumina fibers and mineral fibers as reinforcing fibers and an aluminum alloy as a matrix. Cut out 1′,
A block test piece for wear testing was prepared from these composite materials by machining. Furthermore, each of the above-mentioned composite materials A o
” Volume percentage of Aloo's alumina fiber and mineral fiber,
The total volume fraction of reinforcing fibers was as shown in Table 3 below.

Next, each block test piece was sequentially set in the friction and wear tester 1, and the bearing steel (JIS standard 5LIJ2) that was the mating member 7
7) Contact the outer peripheral surface of a cylindrical test piece made of quenched and tempered material (hardness l-1v810), and apply lubricating oil (castle motor oil 5W-
39) while supplying contact surface pressure of 20 kg/ll112
A wear test was conducted in which the cylindrical specimen was rotated for 1 hour at a sliding speed Q of 3 m/5eek. The tested surface of the block test piece in this wear test is shown in Figure 1 x
- It was a plane perpendicular to the y plane. The results of this wear test are shown in FIG. In Figure 4, the upper half represents the wear amount (wear scar depth μ) of the block test piece, and the lower half represents the wear amount (wear loss 111 (1
), and the horizontal axis represents the volume ratio (%) of alumina fibers to the total amount of reinforcing fibers.

From Figure 4, the wear amount of the block test piece decreases as the volume ratio of alumina fiber increases, and in particular, it decreases gradually when the volume ratio of alumina fiber is in the range of 0 to 20%. It can be seen that in a region where the volume ratio is 20% or more, the value is substantially constant. In addition, the wear amount of the cylindrical test piece is as follows in the range where the volume ratio of alumina 41i miscellaneous is 20% or less.
It increases slightly as the volume ratio of alumina fiber increases, but in the range where the volume ratio of alumina fiber is 20% or more,
It can be seen that the volume of alumina fibers is relatively small and substantially constant regardless of the ratio.

Composite materials are generally said to be materials that can be installed, and it is thought that composite agents can be formed. Now, if the volume ratio of alumina fiber to the total amount of reinforced #li miscellaneous is X%, then
The wear amount of the block test piece in the case of 0% is 98μ,
The wear amount of the block test piece when X = 100% is 5
μ, so for the amount of wear of the composite material, the composite l′11
1 holds true, it is recommended that the wear amount Y of the block test piece in the range of X-0 to 100% is Y=HJ8-5)X/100+5. The phantom lines in FIG. 4 represent estimated wear times for block specimens based on such composites. Further, FIG. 5 shows the difference ΔY between the estimated value of the amount of wear of the block test piece based on the compound law and the actual value, with the horizontal axis representing the volume ratio X of alumina fibers to the total amount of reinforcing fibers. From this Figure 5, it is recognized that the wear amount of the block specimen is significantly reduced compared to the estimated value when the volume ratio X is in the range of 5 to 80%, especially in the range of 10 to 65%. This is considered to be the effect of hybridizing alumina fibers and mineral fibers on the amount of wear of the composite material.

Example 2 Alumina l manufactured by ICI Co., Ltd. shown in Table 4 below
The procedure was the same as in Example 1 above using liM (trade name "Saphir") and 11 tons of minerals manufactured by Nittobo Co., Ltd. (trade name "Microfiber") shown in Table 5 below. 80×8 made of alumina fibers and mineral fibers uniformly mixed with each other in various volume ratios using the vacuum forming method of
A fiber former of 0×20 mn+ was formed. Next, the high-pressure casting method in the same manner as in Example 1 of above
A composite material Bo-B+oo shown in Table 6 below was manufactured using a magnesium alloy (ASTM standard AZ91) as a matrix metal.

A block test piece for a friction and wear test was formed from the composite material thus obtained, and a cylindrical test piece made of bearing steel (JIS standard 5UJ2, hardness Hv810) was tested under the same conditions as in Example 1 above. We conducted a wear test on the parts. The results of this wear test are shown in FIG. In Figure 6, the upper half represents the amount of wear on the block scissors piece (wear scar depth μ), and the lower half represents the amount of wear on the cylindrical test piece that is the mating member (wear loss II 1g). , the horizontal axis represents the volume ratio (%) of alumina fibers to the total amount of reinforcing fibers.

The virtual line represents the estimated wear amount of the block specimen based on the compound rule.

From FIG. 6, it can be seen that in this example as well, the wear amount of the block test piece decreased as the volume ratio of alumina fiber increased, and in particular, it decreased significantly when the volume ratio of alumina fiber was in the range of 0 to 40%. It can be seen that in the region where the volume ratio of alumina fiber is 60% or more, the value becomes substantially constant. Furthermore, it can be seen that the amount of wear on the cylindrical test piece is relatively small and remains substantially constant regardless of the volume ratio of alumina fibers.

27- Furthermore, FIG. 7 shows the estimated value and actual measured value ΔY of the amount of wear of the block test piece based on the composite rule, with the volume ratio X of alumina fibers to the total amount of reinforcing fibers being plotted on the horizontal axis. From FIG. 7, it can be seen that the wear amount of the block specimen is significantly reduced compared to the estimated value when the volume ratio X of the alumina fibers is in the range of 5 to 80%, particularly in the range of 10 to 70%.

Example 3 Alumina fibers manufactured by 101 Co., Ltd. (trade name "Safil") shown in Table 7 below prepared by the same treatment as in Example 1 above and those shown in Table 2 above Using the mineral fibers shown, a fiber molded body was formed in the same manner as in Example 1 above, the fiber molded body was used as a reinforcing material, an aluminum alloy (JIS standard AC8A) was used as a matrix, A composite material in which the total volume fraction of reinforcing fibers is 6.3%, the volume fraction of alumina fibers is 1f73.0%, and the volume fraction of mineral fibers is 3.3% is cast by high pressure casting method (water temperature 7
After manufacturing at 30℃ and applying pressure of 1500k (1/) to the melt field, and applying T7 heat treatment to each composite material, the size is 16X6X101nm, and one side (16
Block specimens CI to C6 were prepared, each having a test surface of xlOmm (perpendicular to the x-y plane in FIG. 1). In addition, as a comparative example, a block specimen BO% of the same size made only of aluminum alloy (JIS standard AC8A) and subjected to heat treatment T'r, average fiber diameter 3.0μ, average fiber length 3II
IIll amorphous aluminum arrow-silica fiber (55wt%
A composite material with the same dimensions that is made of A+20B, 45 wt% Si 02 ) with a fiber volume fraction of 6.5% is used as a reinforcement material, and an aluminum alloy (JIS standard AC8A) is used as a matrix, and is heat treated T7. A block test piece C7 was created.

These test pieces were sequentially set in the LFW friction and wear tester, and the mating parts, which had an outer diameter of 35R1m, an inner diameter of 30mm, and a width of 1
It was brought into contact with the outer peripheral surface of a Qmm steel cylindrical test piece, and while supplying room temperature lubricating oil (castle motor oil 5W-30) to the contact area of the test piece, a surface pressure of 20 kg/mmff was applied.
, one cylindrical test piece at a sliding speed of 0.3 m/sec.
A wear test was carried out by rotating for a period of time. In this wear test, the hardness of the cylindrical test piece was increased by heat treatment Hv (10 ko
) was set to various values, and tests were conducted on co-Cr combinations of block test pieces and cylindrical test pieces shown in Table 8 below.

Table 8 Note: 1) JIS standard 5US420J2 2) JISNA grade SUJ 2 3) JISw grade SCr 20 Carburizing and quenching The results of the above wear test are shown in FIG. In Figure 8, the upper half shows the wear amount (wear scar depth μ) of the block test piece, and the lower half shows the wear amount (wear loss U) of the cylindrical test piece, which is the mating material.
The symbols Co to C7 respectively correspond to the test piece combination Co-C7 in Table 8 above.

From FIG. 8, the amount of wear of the block test pieces is very small, except for the block test piece CO, which is made only of aluminum alloy, and the block test piece CI, whose reinforcing fibers are amorphous alumina-silica fibers. There is almost no difference depending on the material and hardness of the steel used as the material, and the wear amount of the cylindrical test piece used as the counterpart material is determined by the hardness HV regardless of the material.
It can be seen that the value is small when (10 kg) is 200 or more, preferably 250 or more.

Example 4 A fiber molded body consisting of alumina fibers shown in Table 4 above and mineral fibers shown in Table 5 above was formed in the same manner as in Example 1 above, The fiber molded body is used as a reinforcing material, magnesium alloy (J18 standard MDCI-A) is used as a matrix, the total volume percentage of reinforcing fibers is 23%, the volume percentage of alumina fibers is 4.3%, and the volume percentage of mineral fibers is 23%. A composite material with a volume fraction of 18.7% was manufactured using a high-pressure casting method (water temperature 700°C, pressure applied to the molten metal 1500 km2), and a block test piece DI with the same dimensions as in Example 3 was prepared. It was created. Further, as a comparative example, a block test piece DO having the same dimensions was made of only a magnesium alloy (JIs standard MDC1-A). These block test pieces were subjected to the same wear test as in Example 3 above. However, in this case, the cylindrical test piece as the mating material is stainless steel (JIS standard 5 (JS420J2, Hv 5
00), and the test was conducted for 30 minutes with the surface pressure set at 5 ko/mmQ.

The results of this wear test are shown in FIG. From FIG. 9, even when the matrix is a magnesium alloy, if the volume fraction of the hybrid fiber and the hardness of the steel are within the scope of the present invention, the wear of both the block test piece and the cylindrical test piece is It can be seen that the amount is a very small value.

Example 5 The total volume percentage of reinforcing fibers is 2.5%, the volume percentage of alumina fibers is 1.0%, and the volume percentage of mineral fibers is 1.5%.
The alumina fibers shown in Table 7 above, the mineral fibers shown in Table 5 above, and copper alloy (Cu-10wt
%Sn) powder was weighed, a small amount of ethanol was added thereto, 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 punched at 40°C.
It was molded into a plate shape by compressing it at a pressure of 00 k(]/.2.Then, the decomposed ammonia gas (dew point -30℃
) Each plate was sintered in a batch type sintering furnace set to
By sintering by heating at 70°C for 30 minutes and slowly cooling in a cooling zone in the sintering furnace, the total volume fraction of reinforcing fibers was 31.0%, and the volume fraction of alumina fibers was 1.
．． 0% and the volume fraction of mineral fibers was 2.0%.

A block specimen E+ for friction and wear testing was formed from the composite material thus obtained. For comparison purposes, copper alloy (Q
A block specimen Eo of the same size was formed only from U-10wt%Sn). Regarding these block test pieces, stainless steel (JIS standard SU S 4.20 J 2, hardness Hv
A wear test was conducted using a cylindrical test piece manufactured by 500) as a mating member. The results of this wear test are shown in FIG. 10th
In the figure, the upper half represents the wear amount (wear scar depth μ) of the block test piece, and the lower half represents the wear amount (wear loss 111 (+)) of the cylindrical test piece that is the mating member.

From Figure 10, even when the matrix is a copper alloy,
It can be seen that when the volume fraction of the hybrid fiber, the hardness of the steel, etc. are within the scope of the present invention, the amount of wear of the block test piece becomes a very small value.

Example 6 Using the alumina fibers and mineral fibers used in Example 1 above, a fiber molded body was formed in the same manner as in Example 1, and the fiber molded body was As a reinforcing material, zinc alloy ('JIS standard ZDC1), lead alloy (
JIS standard WJ8), tin alloy (JIS standard WJ2) as the matrix metal, the total volume percentage of reinforcing fibers is 15%, the volume percentage of alumina fibers is 3%, mineral 1 fiber,
Composite materials with a volume fraction of 12% are manufactured using a high-pressure casting method (temperatures of 500°C, 4.10°C, and 330°C, respectively, and pressure of 500 kLJ/♂ against the molten metal). is 16 x 6 x 10IIII, and one surface ('16'X10IIla1 perpendicular to the x-y plane in Fig. 1) is the test surface.
”T was created. Also, for comparison purpose, zinc alloy (J
'lS standard ZD'CI), lead alloy (JIS standard WJ8)
, block test pieces Fa to To1o of the same size were made of only a tin alloy (JIS standard WJ2>).

Next, the surface pressure of these block test pieces was 5 kg/
ll1lI12. Under the same conditions as in Example 1 above, except that the test time was set to □30 minutes,
A wear test was conducted using a cylindrical test piece made of bearing steel (JIS standard 5LJJ420J2, Hv (10 days >= 500) as a mating member. The results of this wear test are shown in Table 9 below. , the wear ratio of the block test piece is block test piece F, respectively.

It means the percentage of the wear amount (wear scar depth ml1l) of the block test piece F+ ~ l-1+ with respect to the wear m (wear scar depth...m) of ~Ho, and the wear amount of the cylindrical test piece is the block test piece F1 ~1-11 Wear amount of cylindrical specimen rubbed with (
Wear loss (mg). In addition, block test pieces Fo to H
The wear amount of the cylindrical test piece rubbed with O was so small that it could not be measured, and was substantially O.

Table 9 From Table 9, if zinc alloy, lead alloy, and tin alloy are reinforced with hybrid fibers made of alumina fiber and mineral 111m, the amount of wear of those alloys will be reduced without substantially increasing the amount of wear of the mating member. It can be seen that this can be significantly reduced.

Furthermore, from the results of this example, even when the 71~Rix alloy is a tin alloy, lead alloy, or zinc alloy, if the volume fraction of the hybrid fiber, the hardness of the steel, etc. are within the scope of the present invention, the block It can be seen that the wear amount of both the test piece and the cylindrical test piece is a very small value.

From the results of each of the above-mentioned examples, it is clear that this is a combination of two members that come into contact with each other and slide relative to each other, one of which is reinforced with alumina fibers and mineral fibers, and is made of metal such as aluminum alloy. In the case of a combination of two members, such as one made of a composite material with a matrix of Al 20a,
M
O0 content is 10 wt% or less [e20a content is 5 wt% or less and other inorganic content is 10 wt%
From the following mineral fibers, the total amount of non-fibrous particles contained in the aggregate and the content of non-fibrous particles with a particle size of 150μ or more are 20 wt% or less and 7 wt% or less, respectively. The hybrid fibers are reinforced fibers, the matrix is a metal selected from the group consisting of aluminum, magnesium, tin, copper, lead, zinc, and alloys containing these as main components, and the volume percentage of the hybrid fibers is 1% or more. It is understood that the steel constituting the other member is preferably a steel having a hardness HV (10k(+)) of 200 or more, more preferably 250 or more.

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. It will be clear to those skilled in the art that

[Brief explanation of drawings]

Figure 1 is an illustration showing the fiber orientation state of a fiber molded body made of alumina fibers and mineral fibers, Figure 2 is an illustration showing the manufacturing process of a composite material by high pressure casting method, and Figure 3 is the high pressure of Figure 2. A perspective view showing a solidified body formed by casting, and Figure 4 is a wear test conducted between a composite material reinforced with alumina fibers and mineral fibers and an aluminum alloy as a 71~Rix metal, and bearing steel. The results are shown in a graph showing the volume ratio of alumina fibers to the total amount of reinforcing fibers on the horizontal axis. Figure 5 shows the estimated and actual values of the wear amount of the composite material based on the composite agent based on the data shown in Figure 4. Figure 6 shows the difference between the composite material using alumina fibers and mineral fibers as reinforcing fibers and magnesium alloy as the matrix metal, and bearing steel. A graph showing the results of wear tests conducted during the period, with the horizontal axis representing the volume ratio of alumina fiber to the total amount of reinforced 4L navy blue. Figure 7 shows the amount of wear of the composite material based on the data shown in Figure 6. Figure 8 is a graph showing the difference between the estimated value based on the composite agent and the actual value, with the horizontal axis representing the volume ratio of alumina fiber to the total amount of reinforcing fiber. Figure 9 is a graph showing the results of wear tests conducted between composite materials and various steels.
A graph showing the results of a wear test conducted on a composite material made of a magnesium alloy reinforced with m and mineral fibers and a magnesium alloy using stainless steel as a counterpart material,
FIG. 10 is a graph showing the results of an abrasion test conducted on a composite material made of a copper alloy reinforced with alumina fibers and mineral fibers and a copper alloy using stainless steel as a mating material. 1...ll1H molded body, 1'...composite material, 2...
・Alumina fiber, 2a...Mineral fiber, 3...Mold,
4... Mold cavity D, 5... Molten metal, 6...
・Plunger, 7...Coagulant patent applicant: Toyota Motor Corporation
Immediate Patent Attorney Masa Akashi
Tsuyoshi No. 9 Figure 1o Figure (m9) (Voluntary) Indication of procedural amendment 1, fact 9 1985 Patent Application No. 048595 2, combination of name and parts of invention 3, relationship with the case of the person making the amendment Patent applicant address: 1 Toyota-cho, Toyota City, Aichi Prefecture Name (3)
20) 1~Yota Jidosha Co., Ltd. 4, agent's residence No. 104 Shinkawa 1-5-19, Chuo-ku, Tokyo” is amended to “Patent Application Box No. 60-040908j.

Claims (1)

[Claims] In a combination of a first member and a second member that are in contact with each other and slide relative to each other, at least the sliding surface portion of the first member relative to the second member is made of 80 wt% or more of Al_
2O_3, the remainder being essentially SiO_2, the main components are SiO_2, CaO, Al_2O_3, the MgO content is 10 wt% or less, and Fe_
Mineral fibers with a 2O_3 content of 5 wt% or less and other inorganic content of 10 wt% or less, the total amount of non-fibrous particles contained in the aggregate and a particle size of 150μ
Each of the above non-fibrous particle contents is 20 wt% or less,
The reinforcing fibers are hybrid fibers made of mineral fibers with a content of 7wt% or less, and aluminum, magnesium, copper,
The matrix metal is a metal selected from the group consisting of zinc, lead, tin, and alloys containing these as main components, and the hybrid fiber is composed of a composite material in which the volume percentage is 1% or more, and the second At least the sliding surface portion of the member with respect to the first member has a hardness Hv (10 kg) of 20
A combination of members characterized by being made of steel of 0 or more.