JPH07102335A - Sintered sliding member - Google Patents

Abstract

PURPOSE:To obtain a coppery sintered sliding member, free from the problems of vibration, chattering, screeching, and strange noise, causing no seizure to a mating material, and having sufficient mechanical properties, by specifying the grain size and content of hard grains, respectively. CONSTITUTION:This coppery sintered alloy has a structure in which hard grains of <=15mum maximum grain diameter and <=5mum average grain diameter are uniformly dispersed by 15-25wt.% in the inner part of original powder grains in an alloy matrix, and further, this sintered alloy has >=0.4 friction coefficient when slid with a steel material under a dry environment and also has >=0.1 friction coefficient when slid with a steel material in lubricating oil. Moreover, the matrix of this alloy has a composition consisting of 3-20% Sn and the balance essentially Cu. By this method, the sintered sliding member, improved in friction coefficient and excellent in mechanical properties, can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper-based sintered sliding member, which is excellent in wear resistance and seizure resistance, and is about 0.4 to 0.6 under dry sliding conditions. It is possible to stably secure a relatively high friction coefficient, and at that time, since the difference between the static friction coefficient and the dynamic friction coefficient can be suppressed to 0.1 or less, there is a problem such as vibration, chatter, squeal, and abnormal noise during sliding. Can be resolved. Further, in the lubricating oil, a coefficient of friction of more than 0.1 can be stably ensured, and further, the aggressiveness against the mating material is extremely small, and further, high strength, high toughness and high hardness are obtained. It is applicable to sliding members such as dry and wet clutch plates and brake materials.

[0002]

2. Description of the Related Art In recent years, bronze-based sintered alloys have been developed in place of asbestos-based friction materials as materials for dry friction type friction clutches and brakes.
In No. 8-126948 "Dry Sintered Friction Material", hard particles are added in order to obtain a high friction coefficient with a bronze-based sintered alloy.

However, in these sintered materials, there is no reaction layer between the hard particles dispersed in the alloy and the matrix, and a gap exists. Therefore, under high-speed, high-load sliding conditions, hard particles fall off from the base material during friction, making it impossible to secure a high coefficient of friction in a stable manner. Moreover, there is a problem that the fallen particles are caught and the opponent material is attacked. Further, in these sintered materials, the strength of the base material is low, and since the coarse hard particles as described above are unevenly dispersed in the base material, vibration and chatter etc. occur during sliding, and especially the clutch material. When the sliding speed fluctuates as described above, a problem peculiar to the friction sliding material such as squeal and abnormal noise occurs, and it cannot be used.

On the other hand, from the viewpoint of mechanical properties of the friction material, the above-mentioned gap has a problem that mechanical properties such as strength and toughness of the sintered body and hardness are deteriorated. Further, the dispersed hard particles have a large particle size of about 30 to 80 μm, which becomes a starting point of fracture, which causes a problem of inducing a decrease in strength and toughness.

On the other hand, as for the conventional wet friction material, generally, a porous paper friction material or carbon sintered material is used. For example, regarding the former, JP-A-6-2565
No. 3 "paper friction material" is mainly composed of thermosetting resin such as phenol resin and friction modifier such as graphite powder and organic dust.
A friction material is proposed as a reinforcing material such as organic fiber or carbon fiber. On the other hand, regarding the latter, JP-A-4-76086 "Wet friction material" proposes a carbon fiber reinforced carbon sintered body obtained by sintering a composite body of uncarbonized carbonaceous fiber and carbonaceous powder. Both materials are elastically deformable, so that the uneven engaging force can be absorbed on the friction material side.

However, in such a friction material, the coefficient of friction in oil is generally as small as 0.05 to 0.1. Therefore, for example, in order to obtain a sufficient transmission torque in the clutch, the friction material has a large diameter. As a result, it is necessary to reduce the size and size of the area, and as a result, it is not possible to meet the current needs for size and weight reduction. Furthermore, since the friction material made of paper lacks heat resistance, there are problems that the friction material is worn and damaged during friction sliding at high temperature, and the friction coefficient is lowered due to deterioration of characteristics.

Therefore, in order to solve such a problem, Japanese Patent Laid-Open No. 4-76086 "Friction Material" provides a friction material (glass fiber or rubber binder) with a pseudo alloy spray coating made of two kinds of metals.
It proposes a friction material that can secure a high friction coefficient exceeding 0.25 by forming it on the sliding surface.

However, according to this manufacturing method, the thermal spray coating treatment is required in addition to the friction material on the substrate, so that there is a problem in terms of economical efficiency and a complicated process. Further, since the thermal spraying treatment is required, excellent productivity cannot be expected.

On the other hand, bronze (copper-tin) type sintered alloys which have been conventionally used as oil-impregnated bearing materials are excellent in wear resistance and seizure resistance, so that they are hard against such sintered alloys. It is expected that a friction material having particles added and dispersed will obtain a high friction coefficient without causing wear damage.

However, as described above, since the hard particles to be added are present at the grain boundaries of the bronze powder of the base material, they fall off during sliding, rather attacking the mating material, or seizing the sintered material itself. Problems such as wear and abrasion occurred. Furthermore, in sintered alloys for bearings, there are many pores dispersed inside, so
For example, in a high slip speed range exceeding 20 m / sec,
The lubricating oil present in the sintered alloy flows out from the inside, and
By forming an oil reservoir in the holes of the sliding surface, a thick oil film is formed between the sliding surface of the friction material and the mating steel material, and as a result,
There was a problem that the friction coefficient decreased to 0.01 to 0.02.

[0011]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems, the present invention uses C as a hard particle added for the purpose of improving the coefficient of friction under dry and wet sliding.
Finely and uniformly dispersed in the u-Sn alloy matrix, and further, the dispersed hard particles are prevented from falling out of the Cu-Sn alloy matrix during sliding to ensure excellent friction-sliding characteristics and mechanical characteristics. It is an object of the present invention to economically manufacture a sintered member having improved temperature.

[0012]

Therefore, the present inventors have
As a result of various experiments and studies to solve the above problems, a high friction coefficient can be stably ensured under dry and wet sliding friction conditions, and the mating material is not attacked and the amount of wear is large. We have developed a high-strength sintered sliding member that does not cause seizure with the mating material.

According to the present invention, the specific alloy composition and manufacturing method of the sintered sliding member are as follows.

(1) In the copper-based sintered alloy, the maximum grain size is 1
Hard particles having an average particle size of 5 μm or less and an average particle size of 5 μm or less have a structure in which 15 to 25% by weight are uniformly dispersed inside the old powder particles of the alloy base, and when sliding on a steel material in a dry system, 0.4 A sintered sliding member having the above friction coefficient and having a friction coefficient of 0.1 or more when sliding on a steel material in a lubricating oil.

(2) The sintered sliding according to the above item (1), wherein the difference between the static friction coefficient and the dynamic friction coefficient is 0.1 or less when sliding on a steel material in a dry environment. Element.

(3) In the above copper-based sintered alloy, the voids having an average diameter of 30 μm or less are uniformly dispersed in the alloy in an amount of 1% by volume or more and 30% by volume or less. Sintered sliding member.

(4) The composition of the base material of the copper-based sintered alloy is
Sn; 3 to 20% by weight, and the balance substantially consisting of Cu and unavoidable impurities, The sintered sliding member as described in (1) above.

(5) The hard particles are FeMo, FeC.
The sintered sliding member according to (1) above, which is composed of at least one kind or two or more kinds among iron-based intermetallic compounds consisting of r, FeTi, FeW, and FeB.

(6) The sintered sliding member according to the above item 1, wherein the copper-based sintered alloy contains a solid lubricant in an amount of 3% by weight or less, if necessary.

(7) The solid lubricant is graphite, MoS ₂ ,
The sintered sliding member according to (6) above, which is composed of at least one or two or more of CaF ₂ and BN.

(8) The copper-based sintered alloy is Sn; 3 to 2
15 to 25 Cu-Sn alloy powder having a composition of 0 wt% and the balance substantially Cu and inevitable impurities
Hardened by mixing and pulverizing the mixed powder consisting of hard particles of wt% by any one of mechanical alloying method (mechanical alloying method), mechanical mixing method (mechanical grinding method) and granulation method. The alloy powder obtained by pulverizing particles to a maximum particle size of 15 μm or less and an average particle size of 5 μm or less and uniformly dispersing the particles in a Cu—Sn alloy matrix is used as a raw material powder, (1) above. The sintered sliding member described.

(9) The copper-based sintered alloy is Sn; 3 to 2
15 to 25 Cu-Sn alloy powder having a composition of 0 wt% and the balance substantially Cu and inevitable impurities
By mixing and pulverizing the mixed powder consisting of 3% by weight or less of solid particles and 3% by weight or less of the solid lubricant, the hard particles are maximized. Crushed to a particle size of 15 μm or less and an average particle size of 5 μm or less,
In addition, the sintered sliding member according to the above item (1), characterized in that an alloy powder uniformly dispersed in a Cu-Sn alloy base is used as a raw material powder together with a solid lubricant.

(10) The copper-based sintered alloy is Sn powder;
3 to 20% by weight, hard particles; 15 to 25% by weight, and a mixed powder consisting essentially of Cu powder and unavoidable impurities with the balance being mixed by any one of mechanical alloying method, mechanical mixing method and granulation method. -By crushing, hard particles are crushed to a maximum particle size of 15 μm or less and an average particle size of 5 μm or less, and C
The sintered sliding member according to the above item (1), wherein an alloy powder in which the u-Sn alloy base material is uniformly dispersed is used as a raw material powder.

(11) The copper-based sintered alloy is Sn powder;
3 to 20% by weight, hard particles; 15 to 25% by weight, solid lubricant; 3% by weight or less, and a mixed powder consisting essentially of Cu powder and unavoidable impurities, mechanical alloying method, mechanical mixing Hard particles are pulverized to a maximum particle size of 15 μm or less and an average particle size of 5 μm or less by performing a mixing / grinding method of either a powder method or a granulation method, and hard particles and a solid lubricant are contained in a Cu—Sn alloy matrix. The sintered sliding member according to (1) above, wherein an alloy powder in which is uniformly dispersed is used as a raw material powder.

(12) In the raw material powder, if necessary, at least one of graphite, MoS ₂ , CaF ₂ , and BN is used.
3% by weight or less of a solid lubricant composed of two or more kinds,
The above item (8) or (1)
The sintered sliding member according to item 0).

Next, the reason why the alloy composition and the amount of voids are set as above in the above-mentioned copper-based sintered alloy will be explained.

Sn Sn forms the base material of the present alloy together with Cu, and has the action of improving the high temperature strength and toughness of the alloy, and also the action of improving seizure resistance with the mating material at high temperatures. If the addition amount is less than 3% by weight, these effects are not exerted, and if the addition amount exceeds 20% by weight, a hard and brittle phase precipitates, so that the strength and toughness are lowered. Therefore, the Sn content is 3 to 2
It was set to 0% by weight.

Hard Particles (Ferrous Intermetallic Compounds) Hard particles are finely and uniformly dispersed in the base material of the present sintered alloy, and adhere to the mating material at room temperature and high temperature under dry and wet friction conditions. It has the effects of suppressing the occurrence of the heat, improving the seizure resistance, and directly contacting the surface of the base material of the mating material to increase the friction coefficient and improving the wear resistance.

Furthermore, since the hard particles have the effect of directly contacting the surface of the base material of the mating material to increase the friction coefficient, the C of the base material is increased.
By finely and uniformly dispersing inside the u-Sn-based old powder particles, a smooth friction sliding state with the mating material can be obtained. That is, it is possible to suppress the change in the friction coefficient with respect to the change in the sliding speed. As a result, under dry friction conditions, the difference between the coefficient of static friction and the coefficient of dynamic friction at the start or stop of sliding can be suppressed to 0.1 or less, and problems such as vibration, chatter, squeal, and abnormal noise can be solved. effective.

The influence of the size and the addition amount is as follows. If the content is less than 15% by weight, the coefficient of friction of the sintered material decreases, and the effect of improving wear resistance cannot be obtained. If the maximum particle size exceeds 15 μm, the average particle size exceeds 5 μm, or the content thereof exceeds 25% by weight, the hard particles are apt to be the starting point of cracking, resulting in the strength of the sintered material. It is not preferable to add the hard particles in such a range because the toughness is deteriorated, and also from the viewpoint of the attacking property of the other party, since the other party material is severely worn.
Furthermore, it is not preferable because the effect of suppressing the problems such as vibration, chatter, and abnormal noise described above is reduced.

Further, the maximum particle size is 15 μm or less, and the average particle size is 5
In the case of containing 15 to 25% by weight of hard particles having a size of μm or less,
By finely and uniformly dispersing the particles in the matrix, the effect of stabilizing the friction coefficient can be obtained. Therefore, it is appropriate that the hard particles have a maximum particle size of 15 μm or less and an average particle size of 5 μm or less, and the total content is 15 to 25% by weight.

As the iron-based intermetallic compound, Fe is used.
It is desirable to be composed of at least one or more of Mo, FeCr, FeTi, FeW, and FeB. In addition to iron-based intermetallic compounds, Al ₂ O ₃ , SiO ₂ , Z
Metal oxides such as rO ₂ and ceramics such as SiC and AlN also have the effect of improving the friction coefficient, but since these particles are inferior in machinability to iron-based metal compounds, they pose a problem in terms of economy. Therefore, it is desirable to apply an iron-based metal compound to this sliding member.

However, when these iron-based intermetallic compounds fall off from the base material during sliding, seizure occurs due to transfer / adhesion with the mating material starting from the falling part, and the fallen particles also cause the mating material. There is a problem that the mating material will wear or damage the mating material. Therefore, in order to suppress such a phenomenon and ensure a stable high friction coefficient, it is necessary to uniformly disperse the fine intermetallic compound in the Cu—Sn alloy base material and to prevent the particles from falling off. .

The specific method is as follows. That is, a metal pulverized into a maximum particle size of 15 μm or less and an average particle size of 5 μm or less by mechanically alloying the above intermetallic compound with Cu—Sn alloy powder or a mixed powder of Cu powder and Sn powder. The intermetallic compound can be finely and uniformly dispersed in the Cu-Sn alloy powder particles. Then, after the powder is embossed, molded, and sintered, Cu of the base material is formed.
By forming a reaction layer at the interface between the —Sn alloy and the intermetallic compound, the intermetallic compound can be firmly fixed in the matrix. Specifically, the intermetallic compound is not converted into Cu until the intermetallic compound is applied by applying a mechanical powder mixing / grinding method such as a mechanical alloying method, a mechanical grinding method, or a granulation method.
It was found that a Cu-Sn alloy powder was obtained which was finely and uniformly dispersed in the -Sn alloy powder particles and which did not fall off from the sintered body base during sliding.

Incidentally, this mechanical powder mixing treatment is carried out by a dry method instead of the conventional wet method such as ball milling and mixing. In some cases, PCA (Process)
Excessive aggregation may be prevented by adding a small amount of stearic acid, alcohol, or the like as Control Agent. An attritor or a ball mill is suitable as the processing device. The former is suitable for high-speed processing because it has excellent pulverization efficiency, and the latter is easy to control the atmosphere that requires long-time processing, and is relatively economical if the input energy is properly designed. ing.

Solid Lubricant The solid lubricant improves the aggressiveness to the mating material under dry friction conditions and has a relatively high friction coefficient of about 0.4 to 0.6 under dry sliding conditions at high temperature. It has a stabilizing effect, which can improve the lubricity between the sliding surfaces, and can suppress the problem of squeaking during sliding and the occurrence of vibration and chattering.

When the sliding speed increases under wet friction conditions, the lubricating oil is taken into the holes due to the wedge effect in the holes existing on the sliding surface, so that the sintered friction material and the mating steel material A lubricating film is formed between the sliding surfaces of. In particular, when used in a high sliding speed range exceeding 20 m / sec, there is a problem that the friction coefficient fluctuates / decreases.
However, with respect to such a problem, the inclusion of the solid lubricant can improve the stability of the friction coefficient with respect to the sliding speed.

In the Cu--Sn system sintered alloy, the above effect is obtained.
A solid lubricating component that has fruit is economically less black
Lead, MoS ₂, CaF₂And BN. Meanwhile, the other
As a sliding component, for example, Pb is used in Cu-Sn alloy bearings.
Used as a fine particle without forming a compound with the substrate
As it exists between the α-phase dendrites, the sliding member
When applied to, it may fall off during sliding. Incidentally, black
Lead, MoS₂, CaF₂, BN, at least one or more
It is effective to add 3% by weight or less. 3% by weight
If added over the range, the strength and toughness of the sintered body will be significantly reduced.
It is not preferable because

Amount of Voids Voids have a size of 30 μm or less, and are uniformly distributed on the sliding friction surface of the sintered alloy, so that the voids are deformed during sliding and that during sliding. Due to the wedge effect, air flows into the holes to generate buoyancy, and under dry sliding,
It has the effect of improving the seizure resistance and the compatibility with the mating material. Further, under wet sliding, an oil reservoir (oil film) is formed in the pores due to the oil impregnation effect as described above, and the effect of improving seizure resistance can be obtained.

When the size of the pores exceeds 30 μm, this becomes a starting point of crack generation, and the strength and toughness of the sintered body are significantly reduced. Further, if the amount is less than 1% by volume, the above effect is small, and if it exceeds 30% by volume, the strength and toughness of the sintered alloy deteriorate. Furthermore, if the pores are unevenly distributed, the conformability with the mating material during sliding is locally reduced, so that a stable coefficient of friction cannot be obtained and seizure with the mating material occurs. Therefore, in the present sintered sliding member, it is appropriate that the pores have a size of 30 μm or less and that the pores are evenly distributed in the sliding member at 1 to 30% by volume. In the present invention, the size and amount of the above-mentioned voids can be controlled by the pressure when the powder is pressed and molded.

The sintered sliding member having the alloy composition as described above and prepared based on the above-mentioned manufacturing method has strength, toughness, hardness, etc. which can be sufficiently used as a structural member by itself without a reinforcing material. It has mechanical properties, wear resistance and self-lubricating property. In addition, in a normal Cu-Sn alloy, the friction coefficient at the initial stage of sliding under dry friction sliding conditions is about 0.2 to.
About 0.3, and the friction coefficient is about 0.02 to 0.05 under the wet friction sliding condition, and
As the friction progresses, the friction coefficient fluctuates and increases, and eventually seizure occurs with the mating material or the sintered material itself wears.

On the other hand, the present sintered sliding member can stably maintain a friction coefficient of about 0.4 or more under dry sliding and about 0.1 or more under wet sliding, and further, dry sliding. Under the conditions, the difference between the static friction coefficient and the dynamic friction coefficient can be suppressed to 0.1 or less. In addition, seizure with the mating material and abrasion damage do not occur without attacking the mating material during sliding.

[0043]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Example 1 The alloy compositions of the sintered friction material of the present invention and the comparative material are shown in Table 1, and the mechanical properties and friction test results of the sintered friction material (friction coefficient, friction material and mating material SS41 material). The amount of friction) is shown in Table 2.

Regarding the manufacturing conditions, each powder was molded and sintered based on the process shown in FIG. ("Mechanical crushing / mixing treatment" in the figure means a mechanical alloying method, a mechanical mixing method, and a granulating method.) The friction test was carried out by the dry friction tester shown in FIG. Δμ means the difference between the static friction coefficient and the dynamic friction coefficient. Here, the friction coefficient at the moment when the sample starts frictional sliding is taken as the static friction coefficient, and the average value of the friction coefficient for 2 seconds from the start of the test is The dynamic friction coefficient was used.

In the table, No. 1 to 17 are the sintered members of the present invention, and No. 18 to 28 are comparative materials. Here, only the amount of voids is shown in volume%, and the other values are all in weight%. Also, the symbols A, B, C, D of solid lubricants
Are respectively A; graphite, B; MoS ₂ , C; CaF ₂ , D;
It means BN.

Incidentally, * 1, * 2 and * 3 in the remarks column of Table 1 are as follows. * 1) The mixed powder is mechanically crushed and mixed based on the manufacturing process (a) in FIG. 1, but the average particle size of the Fe-based metal compound that is the dispersed hard particles is changed to 15 by changing the crushing conditions.
An alloy obtained by forming and sintering this in μm. * 2) The mixed powder is mechanically pulverized and mixed based on the manufacturing process (a) in Fig. 1. However, the pore diameter distributed in the powder compact is averaged by changing the surface pressure condition during powder compaction. 45
μm, and an alloy obtained by sintering this. * 3) An alloy obtained by mixing powders having the specified composition without mechanical pulverization / mixing treatment such as mechanical alloying, mechanical mixing, and granulation, and then sintering.

[0048]

[Table 1]

[0049]

[Table 2]

Sample No. 1 to 17 are alloys of the present invention, and their mechanical properties and friction test results are good as shown in Table 2.

On the other hand, the test results of the comparative material are as follows. 18: Since the Sn content was as small as 2%, the friction material was worn due to insufficient strength of the base material, and the μ value increased. 19: Since the Sn content is as large as 35%, the base material is significantly hardened and attacks the partner material to increase the μ value. 20: A sufficient μ value cannot be obtained because the hard particles are as small as 10 wt%. 21: A sufficient μ value cannot be obtained because the hard particles are contained in a large amount of 30 wt%. 22: Since solid lubricant is not contained, poor lubrication occurs and seizure occurs with the mating material. 23: Strength and toughness deteriorate because the solid lubricant content is as large as 4%. 24: Since the amount of voids is 0%, seizure resistance is reduced and seizure occurs with the mating material. 25: Since the amount of pores is as large as 35%, the strength and toughness are insufficient and the friction material wears. 26: Since the average particle diameter of the hard particles was as large as 15 μm, the strength and toughness deteriorated, and when the mating material was attacked, the Δμ value became large as 0.18, and vibration and abnormal noise were generated during sliding. 27: Strength is due to the large size of pores of 45 μm on average.
The toughness is insufficient and the friction material wears. 28: The reaction layer between the hard particles and the base material is not formed because there is no mechanical pulverization / mixing treatment, and only the powders having the predetermined components are mixed and then sintered, and coarse hard particles are present. Therefore, when sliding, hard particles fall off from the base material and cause seizure with the mating material, and the Δμ value increases to 0.26, causing vibration and noise during sliding, and further increasing the strength of the sintered material.
Toughness decreases.

Example 2 Friction test results of the sintered friction material of the present invention and the comparative material produced based on the alloy composition and the production method shown in Table 1 (friction coefficient against sliding speed, friction material and mating material). Table 3 shows the amount of wear of the S35C material. The friction test was carried out by the wet friction tester shown in FIG.

[0053]

[Table 3]

In the table, No. 1 to 10 are sintered members of the present invention, and No. 11 to 18 are comparative materials. The alloy No. of the present invention. The friction test results of 1 to 10 are good as shown in Table 3.

On the other hand, the test results of the comparative material are as follows. 11: Since the Sn content was as small as 2%, the friction material was worn and seized due to insufficient strength of the base material, and the μ value increased. 12: Since the Sn content was as large as 35%, the base material was significantly hardened and the S35C material on the other side attacked, causing seizure, resulting in an increase in the μ value. 13: A sufficient μ value cannot be obtained because the hard particles are as small as 10 wt%. 14: Since a large amount of hard particles is contained at 30 wt%, S35C material on the other side attacks and seizure occurs, resulting in an increase in μ value. 15: Since no solid lubricant is contained, the friction coefficient fluctuates when sliding at high speed. 16: Since the amount of pores is 0%, an oil film (oil sump) is not formed and seizure occurs with the mating material. 17: The reaction layer between the hard particles and the base material is not formed because there is no mechanical pulverization / mixing treatment, and only the powders having the predetermined components are mixed and then sintered, and coarse hard particles are present. Therefore, the hard particles fall off from the base material during sliding, causing seizure with the mating material, and as a result, the μ value increases. 18: The reaction layer between the hard particles and the base material is not formed because there is no mechanical pulverization / mixing process, and only the powders having the predetermined components are mixed and then sintered, and coarse hard particles are present. Therefore, the hard particles fall off from the base material during sliding, causing seizure with the mating material, and as a result, the μ value increases.

[0056]

The copper-based sintered friction material of the present invention can stably maintain a friction coefficient of about 0.4 or more under dry friction sliding conditions and 0.1 or more under wet friction sliding conditions, and During dry sliding, the difference between the static friction coefficient and the dynamic friction coefficient was set to 0.
Vibration, chatter, and squeal during sliding can be suppressed by suppressing it to 1 or less.
Problems such as abnormal noise can be solved. Further, during frictional sliding, the mating material is not attacked, and seizure with the mating material does not occur. Furthermore, since it has sufficient mechanical properties such as strength, toughness and hardness, the sintered friction material alone can be used as a structural member.

Therefore, the application of this material includes a clutch material for a compressor, a brake friction material for automobiles, motorcycles and vehicles, and a wet sliding member for an automatic transmission.

[Brief description of drawings]

FIG. 1 is a process drawing showing a manufacturing process of a sintered sliding member of the present invention.

FIG. 2 is an explanatory diagram of a dry friction test of the sintered sliding member of the present invention.

FIG. 3 is an explanatory diagram of a wet friction test of the sintered sliding member of the present invention.

Claims (12)

[Claims] 1. The maximum grain size of a copper-based sintered alloy is 15 μm.
It has a structure in which hard particles having an average particle size of 5 μm or less and having an average particle size of 5 μm or less are uniformly dispersed within the old powder particles of the alloy base in an amount of 15 to 25% by weight. A sintered sliding member having a coefficient of friction of 4 or more and a coefficient of friction of 0.1 or more when sliding on a steel material in a lubricating oil. 2. The sintered sliding member according to claim 1, wherein the difference between the static friction coefficient and the dynamic friction coefficient is 0.1 or less when sliding on a steel material in a dry environment. 3. The average diameter of the copper-based sintered alloy is 3
The sintered sliding member according to claim 1, wherein pores having a diameter of 0 μm or less are uniformly dispersed in the alloy within a range of 1% by volume to 30% by volume. 4. The composition of the base material of the copper-based sintered alloy is S
The sintered sliding member according to claim 1, wherein n: 3 to 20% by weight and the balance substantially consists of Cu and inevitable impurities. 5. The hard particles are made of FeMo, FeCr,
The sintered sliding member according to claim 1, wherein the sintered sliding member is made of at least one kind or two or more kinds among iron-based intermetallic compounds consisting of FeTi, FeW, and FeB. 6. The sintered sliding member according to claim 1, wherein the copper-based sintered alloy contains a solid lubricant in an amount of 3% by weight or less, if necessary. 7. The solid lubricant is graphite, MoS ₂ , Ca
The sintered sliding member according to claim 6, which is made of at least one kind or two kinds or more of F ₂ and BN. 8. The copper-based sintered alloy contains Sn; 3 to 20% by weight, the balance being Cu—Sn alloy powder having a composition substantially consisting of Cu and inevitable impurities, and 15 to 25% by weight. By mixing and pulverizing the mixed powder consisting of hard particles with any one of mechanical alloying method (mechanical alloying method), mechanical mixing method (mechanical grinding method) and granulation method, the hard particles can be maximized. Particle size 15 μm or less,
2. The sintered sliding member according to claim 1, wherein an alloy powder obtained by pulverizing to an average particle diameter of 5 [mu] m or less and uniformly dispersing it in a Cu-Sn alloy base is used as a raw material powder. 9. The copper-based sintered alloy contains Sn; 3 to 20% by weight, the balance being Cu—Sn alloy powder having a composition essentially consisting of Cu and inevitable impurities, and 15 to 25% by weight. The hard particles have a maximum particle size of 15 μm by mixing and pulverizing the hard particles and a mixed powder of 3% by weight or less of a solid lubricant by any one of a mechanical alloying method, a mechanical mixing method and a granulating method. The sintered slide according to claim 1, wherein an alloy powder pulverized to an average particle size of 5 μm or less and uniformly dispersed in a Cu—Sn alloy base together with a solid lubricant is used as a raw material powder. Element. 10. The copper-based sintered alloy is Sn powder;
20% by weight, hard particles; 15 to 25% by weight, a mixed powder comprising the balance substantially Cu powder and unavoidable impurities,
The maximum particle size of hard particles is 1 by performing mixing and crushing process of any one of mechanical alloying method, mechanical mixing method and granulation method.
5 μm or less, an average particle size of 5 μm or less, and Cu-
The sintered sliding member according to claim 1, wherein an alloy powder in which the Sn alloy base is uniformly dispersed is used as a raw material powder. 11. The copper-based sintered alloy is Sn powder;
20% by weight, hard particles; 15 to 25% by weight, solid lubricant; 3% by weight or less, and a mixed powder consisting essentially of Cu powder and inevitable impurities, mechanical alloying method, mechanical mixing method, Hard particles are pulverized to a maximum particle size of 15 μm or less and an average particle size of 5 μm or less by performing any of the mixing and pulverizing processes of the granulation method, and the hard particles and the solid lubricant are uniformly dispersed in the Cu—Sn alloy matrix. The sintered sliding member according to claim 1, wherein the alloy powder dispersed in is used as a raw material powder. 12. A solid lubricant comprising at least one or two or more of graphite, MoS ₂ , CaF ₂ , and BN is added to the raw material powder in an amount of 3% by weight or less, if necessary. The sintered sliding member according to claim 8 or 10.