JPH06264110A - Sintered sliding member having low friction coefficient and its production - Google Patents

Abstract

PURPOSE:To obtain a sintered sliding member excellent in the initial fitness of sliding and low in a friction coefficient by impregnating a spotted porous sintered body, in which the soft sliding part is constituted of IB group metals and the hard regulating part is constituted of alloys contg. Sc, Ti, V, Cr or the like, with a lubricating oil. CONSTITUTION:A spotted porous sintered body is formed in which the matrix of the sliding face is constituted of IB group metals (Cu, Ag and Au) by 5 to 95% (area ratio) and the balance elements and/of alloys selected from Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Y, Zr, Nb or the like excluding the main componental metals of the mating sliding member. This sintered body is subjected to sizing in a lubricating oil, in a state in which the lubricating oil is sufficiently fed or in a state in which the material is impregnated with the lubricating oil. The lubricating oil contains an organic compound contg. halogen and having no polar groups and/or an inorganic compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered sliding member having a sliding surface such as a slide bearing, and provides a sintered sliding member having excellent initial sliding conformability and a low friction coefficient. .

[0002]

2. Description of the Related Art As a sintered sliding member having a sliding surface,
Examples include sintered oil-impregnated bearings used in various industrial machines, motors, audio equipment, and the like. Sintered bearing alloys include bronze-based and iron-copper-based materials, and if necessary, those alloys include substances having a solid lubricating action such as graphite, molybdenum disulfide, and lead.

On the other hand, the lubricating oil to be impregnated is turbine oil, spindle oil, synthetic oil or the like, and the one having an appropriate viscosity is selected in consideration of the surface pressure, sliding speed, environmental temperature, etc. in which the bearing is used. Various additives are added. By the way, the coefficient of friction of the plain bearing is high in the initial stage of friction, and gradually decreases and enters a stable period when the stage of initial wear ends. The shorter the time required for this initial familiarization, the more preferable it is for practical use.However, for this reason, it should be manufactured in consideration of the finished surface condition of the sliding surface, or a soft alloy that does not impair surface pressure resistance and durability, for example, Consideration such as selecting a bronze material is made.

It is naturally preferable that the coefficient of friction after the stable period is as low as possible. The friction coefficient is generally said to be determined by mixing the three states of fluid lubrication, boundary lubrication, and metal contact lubrication, and if the ratio of metal contact with the highest friction coefficient level is reduced, The overall coefficient of friction should decrease. From this idea, it is effective to add a solid lubricant such as graphite to the alloy, or an oily agent having a polar group or an extreme pressure agent in the lubricating oil.

However, a material containing a solid lubricant has a friction coefficient of the solid lubricant of at least about 0.1, which is a large difference from that of boundary lubrication, so that a large effect cannot be expected. In addition, the solid lubricant is generally turbid in the lubricating oil to increase the apparent viscosity of the lubricating oil and increase the friction coefficient. On the other hand, it is preferable to select the lubricating oil considering the increase in viscosity. However, there is also the problem of material strength. Further, the oiliness agent basically exerts its performance by the adsorption action with the oxide, and exerts its effect only under mild conditions. It is considered that the extreme pressure agent is effective in forming an inorganic compound by the reaction with a metal, and this is the first time it works at high temperature due to the heat generated by the adhesion due to the metal contact, and it is effective if the metal contact state does not pass once. It does not work and does not work from the beginning.

Conventionally, as a bearing used for an audio device, a bronze-based material contains an optimum amount of molybdenum disulfide, and a sintered alloy impregnated with a selected lubricant has a low initial running-in property and a low friction coefficient and is favorable. There is also a report that there is.

[0007]

In bearings used for devices such as audio equipment, which are aimed at high performance and miniaturization,
While higher surface pressure is being realized along with miniaturization, there is an increasing demand for low friction, low power consumption, and long life.
However, various studies such as the bronze-based material alloy design, the manufacturing method of the sintered sliding member, and the selection of the lubricating oil have been made in the past, and it is difficult to significantly improve the characteristics. . Against such a background, an object of the present invention is to provide a sintered part which has a good initial conformability in sliding and a low coefficient of friction.

[0008]

[Means for Solving the Problems] In order to achieve the purpose,
In the sintered sliding member having the sliding surface of the present invention, 5 to 95% of the area of the matrix portion of the sliding surface is a Group 1B metal, and the remainder of the matrix excludes the main component metal of the mating sliding member. Sc, Ti, V, Cr, Mn, Fe, Co, Ni,
It is characterized by comprising a mottled porous oil-containing sintered alloy which is at least one kind of alloy containing a single element and / or an element selected from the group of Y, Zr, Nb, Mo, Tc, Ru and Rh.

This sliding member has the same effect even if the material of this composition is only the sliding surface or the composition is the whole. The area ratio of the sliding surface can be approximately represented by the weight ratio. The impregnated oil is an organic compound containing halogen (fluorine, chlorine, bromine, iodine) in the oil and having no polar group, R
It is important that the lubricating oil contains at least one of nonpolar compounds such as ₂ S, R ₂ O, and aromatic compounds. Here an atomic group having a polarity to the polar group, for example, a -CO, -COOH, -OH, etc. -NH _2.

The method for producing the low friction coefficient sintered sliding member of the present invention includes a matrix of sliding surfaces having an area ratio of 5 to 5.
95% is Group 1B metal, and the balance of the matrix is Sc, Ti, V, Cr, M excluding the main component metal of the mating sliding member.
n, Fe, Co, Ni, Y, Zr, Nb, Mo, Tc,
A mottled porous sintered body, which is at least one kind of an alloy containing a single element selected from the group consisting of Ru and Rh and / or an element thereof, is produced, and an organic compound containing a halogen and having no polar group, or a non-polar compound is prepared. It is a method of sizing in a lubricating oil containing at least one of them, or in a state where the lubricating oil is sufficiently supplied, or in a state where the lubricating oil is impregnated in the material, and mainly considering the initial compatibility Is the way.

As still another method, 5 to 95% of the area of the sliding surface matrix is a Group 1B metal, and the balance of the matrix is S excluding the main component metal of the mating sliding member.
c, Ti, V, Cr, Mn, Fe, Co, Ni, Y, Z
A mottled green compact which is at least one of a single element selected from the group consisting of r, Nb, Mo, Tc, Ru, and Rh and / or an alloy containing the element is placed in a furnace in a reducing or inert gas atmosphere. There is a method of sintering and immersing the sintered body in a gas atmosphere of the furnace in a lubricating oil containing at least one of an organic compound containing a halogen and not having a polar group and a non-polar compound. This will lead to improved manufacturing efficiency.

As a manufacturing method, a group 1B metal powder,
Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Y,
A mixture of a single element selected from the group of Zr, Nb, Mo, Tc, Ru, and Rh and / or at least one powder of an alloy containing the element, and Sn, Pb, Bi, or an alloy thereof. Up to 5% by weight of at least one powder
Means for additionally mixing, compression molding, and then sintering at a temperature not lower than the melting point and not higher than 700 ° C. of the additionally mixed metal or alloy are also included.

[0013]

The initial conformability of friction is improved by softening the material of the sliding surface. In this case, durability such as wear resistance and surface pressure resistance deteriorates. Therefore, the sliding surface needs to have an appropriate hardness. The 1B group metal in the present invention becomes a soft sliding portion, and Sc, Ti, V, Cr, Mn, F
e, Co, Ni, Y, Zr, Nb, Mo, Tc, Ru,
A single element selected from the group of Rh and / or an alloy containing the element acts as a hardness adjusting portion for the entire material.

In order to obtain a low friction coefficient, it is necessary that the lubricating oil component be easily adsorbed on the sliding surface. The adsorptivity of Sc, Ti, V, Cr, Mn, Fe, Co,
A single element selected from the group of Ni, Y, Zr, Nb, Mo, Tc, Ru and Rh and / or an alloy containing the element is extremely effective. The Group 1B metals are also good in the order of copper, silver and gold. This finding is based on the result of examining the adsorption property of the oil component on the new metal surface.

When the amount of the Group 1B metal occupying the sliding surface is less than 5% in terms of area ratio, the soft characteristics cannot be sufficiently exhibited, and particularly the initial conformability becomes a problem. On the other hand, if the amount exceeds 95%, the whole material is too soft and there is a problem in surface pressure resistance.
Even in the range of 5% to 95%, when the amount of the 1B group metal is large, the initial conformability is good, and when it is small, the hardness is relatively high and the adsorption of the oil component is excellent, and the surface pressure is high, which is suitable for use.

When considering the durability of the sliding surface, the metal forming the matrix other than the 1B group metal is effective because the alloy form has a relatively higher hardness than the pure metal. 1
Group B metals and Sc, Ti, V, Cr, Mn, Fe, C
A single element of o, Ni, Y, Zr, Nb, Mo, Tc, Ru, and Rh or an alloy containing the element is formed in a patchy shape, and shares the respective functions. As the metal forming the matrix other than the 1B group metal, Sc, Ti, V, C
r, Mn, Fe, Co, Ni, Y, Zr, Nb, Mo,
Any of Tc, Ru, and Rh is effective, and Ni is particularly preferable among them.

Lubrication of the sliding surface for obtaining a low friction coefficient is preferably such that it is easily adsorbed on the metal of the sliding surface. Moreover, it is important to consider it microscopically without recognizing it as a macroscopic attraction to the sliding surface. That is, usually the metal surface is covered with a metal oxide,
The metal oxide is also adsorbed, and a new surface of the metal is generated due to abrasion and plastic deformation accompanying sliding, but the effect is not sufficient unless the new surface is also effectively adsorbed. Among the additives added to the lubricating oil, the oiliness agent is adsorbed on the metal oxide by the polar group, and is not adsorbed on the new metal surface.
In addition, the extreme pressure agent is a reaction with a metal at a high temperature and requires a temperature. Therefore, a new metal surface is always generated in actual sliding, and a new metal surface is dynamically generated. By adding a substance that preferentially adsorbs to the new metal surface in advance,
It interferes with metal contact and leads to boundary lubrication, which reduces the overall coefficient of friction.

In particular, if the lubricating oil contains an organic compound or a nonpolar compound containing a halogen and not having a polar group, the adsorptivity to the nascent metal surface is good. Organic compounds containing halogens and having no polar groups include methane chloride, fluorinated benzene, cyclohexane bromide, propyl iodide, etc.,
Examples of non-polar compounds include benzene, diethyl sulfide and diethyl ether.

This is considered to be closely related to the electron orbit. S as a metal added to the Group 1B metal
c, Ti, V, Cr, Mn, Fe, Co, Ni, Y, Z
The elements r, Nb, Mo, Tc, Ru, and Rh are generally called transition elements, and are elements having an empty orbit in the d orbit. This empty orbit is likely to accept the electrons of the adsorbed substance, and it is considered that the electrons are transferred and absorbed. On the other hand, as the substance to be adsorbed, a substance that easily gives electrons is preferable. An organic compound containing a halogen has an electron donating property because it has a property of easily giving an electron, and is effective as an adsorbing substance. However, if a polar group is present here, the polar group has a stronger polarity, and the probability of adsorption to the metal oxide increases, which impedes the adsorptivity to the nascent metal surface. Therefore, it is better not to have a polar group. Is. Further, benzene, which is a nonpolar compound, has a π bond, and diethyl sulfide has a non-bonding electron pair. Since the π electron and the non-bonding electron pair have an electron donating property, a nonpolar compound having them is also effective. This π electron or non-bonding electron pair is a donation of two electrons, and a metal having two empty orbitals on the d orbital is well adsorbed on the accepting metal side. Therefore, Ni in which the s orbit is filled and the d orbit is 8 is particularly preferable.

Here, as the mating sliding member, an iron-based material (carbon steel, stainless steel, etc.) is generally used, and when iron is selected as an element to be added to the 1B group metal of the material of the present invention. , Fe-Fe slides, and so-called sliding occurs, which is unfavorable for the sliding characteristics.
Therefore, it is necessary to remove the main component element of the mating sliding member.

The Group 1B metal also has adsorptivity.
Since the d-orbital is filled in the 1B group metal, the acceptance of electrons is performed with respect to the s-orbital. Of the simple metals, the adsorptivity to the new metal surface is higher. It is also said that the surface of 1B metal exhibits a transition metal property due to lattice defects and the like, and is a good metal as a sliding material in addition to its soft characteristics.

In the case of the material of the present invention, the lubricating oil naturally contains the usual additives such as an oily agent containing a polar group, an extreme pressure agent, a viscosity index improver, an antioxidant, a detergent dispersant and an antifoaming agent. Even if added, the effect of the invention can be obtained, and the addition becomes better as the sliding property than in the case where this usual additive is not added.
As described above, Sc and T which are soft and have good adsorptivity, and which have an appropriate hardness as a hard layer and an appropriate hardness as a hard layer,
i, V, Cr, Mn, Fe, Co, Ni, Y, Zr, N
By forming a mottled sliding surface of a phase having a single element of b, Mo, Tc, Ru, and Rh, and at least one of alloys containing the element, excellent initial conformability and low friction coefficient are exhibited. .

In order to lower the friction coefficient even in the initial stage, it is effective to form an adsorption phase on the sliding surface in advance. As this method, an organic compound containing a halogen and having no polar group when sizing the porous sintered body, a lubricating oil containing at least one of a non-polar compound or a state where the lubricating oil is sufficiently supplied or If the lubricating oil is impregnated, the adsorbed substance can act immediately upon plastic working during sizing to generate a new metal surface, thereby forming an adsorbed phase in advance. This adsorption phase reduces the coefficient of static friction at the initial stage of sliding, and good characteristics at the initial stage of sliding can be obtained.

As another method, the green compact of the present invention is sintered in a furnace in a reducing or inert gas atmosphere, and the sintered body contains halogen in the gas atmosphere of the furnace and has no polar group. There is a method of immersing in a lubricating oil containing at least one of an organic compound and a non-polar compound. This method is mainly a method that improves manufacturing efficiency, reduces processing resistance during sizing, reduces die wear, and also reduces static friction coefficient at the initial sliding stage after sizing. Is.

When the material of the present invention is manufactured, a Group 1B metal powder and Sc, Ti, V, Cr, Mn, Fe, Co, N are used.
A single element of i, Y, Zr, Nb, Mo, Tc, Ru, and Rh or at least one powder of an alloy containing the element is mixed, shaped, and sintered, but the sintering is excessive. It is desirable to carry out at a relatively low temperature so that diffusion does not proceed. However, if strength is required, at least one powder of Sn, Pb, and Bi should be added at a maximum of 5 if necessary.
There is also a method of additionally mixing by weight% and sintering at a temperature of 700 ° C. or lower at which diffusion of the low melting point metal does not proceed excessively above the melting temperature. If the addition amount is 5% by weight or less, there is almost no influence on the sliding property and the adsorptivity.

[0026]

EXAMPLES The low friction coefficient sintered sliding member of the present invention will be described with reference to typical examples. Hereinafter, the composition is% by weight. [Example 1] As a sintered sliding member, a bearing having an inner diameter of 10 mm, an outer diameter of 16 mm and a length of 10 mm was used. The evaluation test was S45C in which the surface roughness of the mating shaft material was polished to 1 s or less,
The load was 2 MPa and the sliding speed was 1 m / min. The frictional coefficient was determined by measuring the force with which the bearing sample co-rotates with the rotation of the shaft during operation by using a strain gauge. The initial running-in time was basically the time to the point of change in the coefficient of frictional change curve over time, but the amount of displacement of the coefficient of friction per minute was calculated and the coefficient of friction for continuous 5 minutes was ± 0.01. 5 minutes was subtracted from the time until it became.

Inventive sample 1 is electrolytic copper powder containing Cu-30%.
A mixed powder obtained by adding 20% of Ni alloy powder and 0.5% of zinc stearate as a molding lubricant was compacted, sintered, and sized. The sintering was performed at low temperature so that the Cu-30% Ni alloy phase and the pure copper phase remained. The effective porosity after sizing is 20 vol%. When the sliding surface is magnified and observed, copper particles and Cu are contained in a porous matrix.
-Ni particles were dispersed in spots.

Inventive sample 2 is pure nickel powder in place of the Cu-Ni alloy powder. Invention sample 3 is
The pure nickel powder of Sample 2 was replaced with pure cobalt powder. Comparative sample 4 is obtained by replacing the pure nickel powder of sample 2 with pure iron powder. Comparative sample 5 is a general bronze-based sintered bearing. For comparison, a mixed powder obtained by adding 10% Sn powder to electrolytic copper powder and 0.5% molding lubricant was molded and fired in the same manner as the conventional one. It is a result of sizing. The same applies to the effective porosity.

A bearing sample was obtained by impregnating these samples with oil.
The impregnating oil has a kinematic viscosity of about 100 cSt at 40 ° C., and is a normal mineral oil (comparative lubricating oil 1), a hydrocarbon-based synthetic oil containing n-propyl iodide (inventive lubricating oil 2), a fluorine-based synthetic oil (inventive lubricating oil). There are three types of oil 3). Table 1 shows the results of these tests. The material of the present invention has a short running-in time and a low coefficient of friction in any lubricating oil as compared with the comparative material. Further, as the lubricating oil, a lubricating oil containing an alkyl halide shows good characteristics, and a fluorine synthetic oil also shows a low coefficient of friction. From this result, it can be seen that the combination of the inventive sample and the inventive lubricating oil exhibits good characteristics.

Further, cobalt showed characteristics almost equivalent to nickel, and iron showed bad characteristics because the mating sliding member was carbon steel. Other Sc, Ti, V, Cr, Mn, F
e, Co, Ni, Y, Zr, Nb, Mo, Tc, Ru,
Rh is considered to have almost the same characteristics as cobalt and nickel.

[0031]

[Table 1]

[Example 2] Sample 6 obtained by impregnating the sized invention sample 1 of Example 1 with lubricating oil 2 and a sample obtained by sizing a sintered body formed and sintered in the same manner as the lubricating oil 2 7. A bearing test was carried out in the same manner as in Example 1 using the sample 8 which was similarly shaped and sintered, then immersed in the lubricating oil 2 without being exposed to the atmosphere in the sintering furnace and then sized. The test results are shown in Table 2. Inventive Samples 7 and 8 are superior in initial conformability, although they are slightly. This is considered to be the effect of oil adsorption on the nascent surface.

[0033]

[Table 2]

[Embodiment 3] Similar to the invention sample 2 of Embodiment 1, 20% pure nickel powder in electrolytic copper powder and 3% (sample 9) and 10% (sample 10) in mixed powder with molding lubricant. The powder to which the tin powder of 1) was added was molded, sintered, sized, and impregnated with the lubricating oil 2. This was similarly bearing tested. As a result, sample 9
Shows an improvement of about 5% in radial crushing strength as compared with Sample 2,
The familiar time was 7 minutes and the friction coefficient was 0.03, which was not much different. However, Sample 10 had an improvement in radial crushing strength of 10% as compared with Sample 2, but the running-in time was 15 minutes, and the friction coefficient was slightly deteriorated to 0.05. [Example 4] Electrolytic copper powder, Cu-30% Ni alloy powder and nickel mixed powder of pure nickel powder 50% each were prepared, and the amount of electrolytic copper powder was set to 3, 20, 50, 80, 97%. Each was mixed with a nickel blended powder. The amount of zinc stearate powder added is 0.5%.

Each compounded powder was molded, sintered and sized as in the previous example, and impregnated with a hydrocarbon synthetic oil containing n-propyl iodide (inventive lubricating oil 2). Table 3 shows the results of bearing tests performed on each sample in the same manner as in the previous example.

[0036]

[Table 3]

The running-in time is better when the amount of copper is large and the amount of nickel phase is smaller, and the friction coefficient is almost the same, but it is slightly better when the amount of nickel phase is large. This is considered to be the effect of the adsorbability of lubricating oil and the soft phase. [Example 5] An oil impregnated sample produced by using a mixed powder obtained by adding 20% of Cu-30% Ni to silver powder was impregnated with the inventive lubricating oil 2 and tested in the same manner. As a result, the running-in time was 6 minutes and the friction coefficient was 0.04, which was not much different from the case of copper powder.

[0038]

As described above, the sintered sliding member according to the present invention has Sc, Ti, V, Cr, Mn, Fe, excluding the copper, silver, gold phases and the main component metals of the mating sliding member. Co, N
i, Y, Zr, Nb, Mo, Tc, Ru, Rh single element or at least one kind of alloy containing the element is used as the sliding surface in a mixed state of the phase, and the compatibility with the sliding surface is specified. By the combination of the lubricating oil containing the compound of (3), a sliding member having excellent initial familiarity and a low friction coefficient could be obtained. As a result, when considering a bearing, for example, the initial running-in time can be shortened as compared with the conventional bearing, and the low friction coefficient makes it possible to reduce power consumption and prolong battery life. This will lead to the improvement of the characteristics of various other sliding members and expand the applications of sintered sliding members.

Claims (10)

[Claims] 1. The area ratio of the matrix of the sliding surface is 5
~ 95% is a Group 1B metal, and the balance of the matrix is Sc, Ti except at least the main component metal of the mating sliding member,
V, Cr, Mn, Fe, Co, Ni, Y, Zr, Nb,
A low friction coefficient sintered sliding member comprising a mottled porous oil-containing sintered alloy, which is an alloy containing a single element and / or an element selected from the group of Mo, Tc, Ru, and Rh. 2. An impregnating oil, which contains a lubricating oil containing at least one of an organic compound containing a halogen and having no polar group, and a non-polar compound.
The low friction coefficient sintered sliding member described. 3. The area ratio of the matrix of the sliding surface is 5
~ 95% is Group 1B metal, the balance of the matrix is Ni
A low friction coefficient sintered sliding member, which is composed of a mottled porous oil-containing sintered alloy which is a simple substance and / or an alloy containing Ni. 4. The low friction coefficient sintering according to claim 3, wherein the impregnating oil contains a lubricating oil containing at least one of an organic compound containing a halogen and having no polar group, and a nonpolar compound. Sliding member. 5. The area ratio of the sliding surface matrix is 5
~ 95% is 1B metal, and the balance of the matrix is at least Sc, Ti, V, excluding the main component metal of the mating sliding member,
Cr, Mn, Fe, Co, Ni, Y, Zr, Nb, M
a single element selected from the group consisting of o, Tc, Ru, Rh and /
Or, to produce a patchy porous sintered body which is an alloy containing an element,
Sizing in a lubricating oil containing at least one of an organic compound containing a halogen and not having a polar group, or a non-polar compound, or in a state where the lubricating oil is sufficiently supplied, or in a state where the lubricating oil is impregnated in the material. A method of manufacturing a low friction coefficient sintered sliding member, comprising: 6. The area ratio of the sliding surface matrix is 5
~ 95% is Group 1B metal, the balance of the matrix is Ni
A mottled porous sintered body that is a simple substance or at least one of Ni-containing alloys is manufactured, and a lubricating oil that contains at least one of an organic compound that does not have a polar group and contains a halogen and a non-polar compound is sufficient or sufficient. As supplied to
Alternatively, a method for producing a low friction coefficient sintered sliding member is characterized in that sizing is performed in a state where the lubricating oil is impregnated in the material. 7. The area ratio of the sliding surface matrix is 5
~ 95% is a Group 1B metal, and the balance of the matrix is Sc, Ti, V, Cr, M excluding the main component metal of the mating sliding member.
n, Fe, Co, Ni, Y, Zr, Nb, Mo, Tc,
A mottled green compact, which is at least one of a single element selected from the group of Ru and Rh and / or an alloy containing the element, is sintered in a furnace in a reducing or inert gas atmosphere to obtain a sintered body. A method for producing a low friction coefficient sintered sliding member characterized by immersing in a lubricating oil containing at least one of an organic compound containing a halogen and having no polar group and a non-polar compound from a gas atmosphere of the furnace . 8. The area ratio of the sliding surface matrix is 5
~ 95% is Group 1B metal, the balance of the matrix is Ni
A mottled green compact that is a simple substance or at least one of alloys containing Ni is sintered in a furnace in a reducing or inert gas atmosphere, and the sintered body contains halogen in the gas atmosphere of the furnace and does not have a polar group. A method for producing a low friction coefficient sintered sliding member, which comprises immersing in a lubricating oil containing at least one of an organic compound and a non-polar compound. 9. A Group 1B metal powder and Sc, Ti, V, C
r, Mn, Fe, Co, Ni, Y, Zr, Nb, Mo,
A mixture of at least one powder of a single element selected from the group of Tc, Ru, and Rh and / or an alloy containing the element with Sn, Pb, Bi, or a powder of at least one of the alloys at a maximum of 5 wt. % Or less additionally mixed, compression molded, and then additionally mixed above the melting point of the metal or alloy 700 ° C
A method for producing a low friction coefficient sintered sliding member, which comprises sintering at the following temperature. 10. A mixture of 1B metal powder and at least one powder of Ni or an alloy containing Ni, Sn, Pb,
Low friction, characterized in that at least one powder of Bi or its alloy is additionally mixed at a maximum of 5% by weight, compression-molded, and then sintered at a temperature not lower than the melting point of the additionally mixed metal or alloy and not higher than 700 ° C. Method of manufacturing coefficient sliding member.