JP2000248352A - Sliding member having low friction coefficient - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the friction coefficient in the sliding face of a member made of metal and to effectively reduce mechanic loss by forming a thermal spraying layer of powder having a specified compsn. contg. S, Mo and Fe and, if required, contg., C, Si, Mn, Ni, Cr, V and W on the sliding face. SOLUTION: At least on the sliding face of a member made of metal, a thermal spraying layer of powder having a compsn. contg., by weight, 1 to 10% S and 3 to 25% Mo so as to satisfy 1.67S+1<=Mo<=1.67S+17, and the balance Fe with inevitable impurities is formed desirably to a thickness of about <=2 mm. At this time, if required, this powder may furthermore be incorporated with 0.10 to 1.2% C, <=2.0% Si and <=1.50% Mn, moreover with one or more kinds of <=5.0% Ni and <=1.50% C, furthermore with one or more kinds of <=3.0% V and <=1.0% W and with wear resistant particles composed of metallic carbide, nitride and oxide particles by 1 to 15% as well. In this way, the sliding member having a low friction coefficient can be obtd. at a low cost without reducing its strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-friction coefficient sliding member having a sprayed layer formed by spraying a low-friction coefficient powder on at least its sliding surface.

[0002]

2. Description of the Related Art Reducing the friction coefficient of the components of various mechanical structural parts, particularly automobile parts, reduces the mechanic loss (mechanical loss) and makes effective use of energy. Useful on

As a means for reducing the friction coefficient of the machine structural part, that the by fine precipitation of Mo _x S _y type of compound in construction material, to reduce the friction coefficient on the basis of the lubrication action of the Mo _x S _y Conceivable.

[0004] In the conventional Fe-Mo-S based casting material has been observed precipitation of this type Mo _x S _y type of compounds, some have been observed reduction in friction coefficient. However, in the case of such a cast material, FeS is simultaneously net-like (net-like).
In fact, FeS precipitated in the form of a net is a major cause of red-hot embrittlement, so that subsequent hot working cannot be performed, and it is not actually used industrially.

On the other hand, when a mechanical structure part such as an automobile part is constituted by a sintered body of powder, Mo is contained in the powder.
_{When an xSy-} type compound is precipitated, it is considered that the coefficient of friction can be similarly reduced. The present inventor has solved the above-mentioned problems of the cast material by sintering a powder having a predetermined composition, and has enabled industrialization (Japanese Patent Application No. Hei 9-14726).
6).

In the case of a sintered body of this powder, good performance was exhibited in terms of characteristics. However, in the case of a sliding member having a low coefficient of friction made of a sintered body, the whole was formed by sintering an expensive powder. Yes,
In addition to being disadvantageous in terms of cost and being expensive, there is an inherent problem that the whole is made of a sintered body, so that it is disadvantageous in terms of strength.

[0007]

The invention of the present application has been made in view of such circumstances. Claim 1
Low friction coefficient sliding member is a metal member,
S: 1-10%, Mo: 3.67S + 1 at 3-25%
≦ Mo ≦ 1.67S + 7, and a sprayed layer of a powder having a composition consisting of unavoidable impurities and Fe is formed at least on its sliding surface.

According to a second aspect of the present invention, there is provided a sliding member having a low coefficient of friction according to the first aspect, wherein the powder has a weight percentage of S: 1 to 10%, M
o: 1.67S + 1 ≦ Mo ≦ 1.67S + at 3 to 25%
7 and C: 0.10 to 1.2%, Si: ≦
2.0%, Mn: ≤2.0%, and has a composition consisting of unavoidable impurities and Fe.

According to a third aspect of the present invention, there is provided a low friction coefficient sliding member according to any one of the first and second aspects, wherein the powder further comprises one or two of Ni and Cr in weight% of Ni: ≦ 5.0. %, C
r: a composition containing ≦ 1.50%.

According to a fourth aspect of the present invention, there is provided the sliding member having a low friction coefficient according to any one of the first to third aspects, wherein the powder further comprises one or two of V and W in a weight% of V: ≦ 3.0. %, W: ≦ 1.
It is characterized by having a composition containing 0%.

According to a fifth aspect of the present invention, there is provided a sliding member having a low friction coefficient according to any one of the first to fourth aspects, wherein the powder further contains wear-resistant particles in a range of 1 to 15% by weight and in total. It is characterized by being.

According to a sixth aspect of the present invention, in the low friction coefficient sliding member according to the fifth aspect, the wear-resistant particles are made of one or more of metal carbide particles, metal nitride particles, and metal oxide particles. It is characterized by.

[0013]

The present invention relates to a composition containing Mo in excess of the solid solubility limit and S in an amount commensurate with the amount of Mo exceeding the solid solubility limit on at least the sliding surface of the metal member. % Of Mo: 3 to 25%, S: 1 to 10% and 1.6%
7S + 1 ≦ Mo ≦ 1.67S + 7 relationships obtained by forming a sprayed layer of powder having a composition satisfying the, case of a low friction coefficient sliding member of the present invention, Mo _x S _y type compounds within the sprayed layer (F
eMo _x S _y ) is finely precipitated and its Mo _x S _y
Based on the lubricating effect of the above, the thermal spray layer itself, and thus the friction coefficient of the sliding surface can be effectively reduced.

Therefore, when the low-friction coefficient sliding member of the present invention is applied to a mechanical structural part, the friction coefficient of the mechanical structural part can be reduced, and the mechanic loss can be effectively reduced.

Further, the present invention forms a low-friction coefficient sliding member by forming a sprayed layer of powder on a sliding surface of a metal member, that is, only forming a sprayed layer on at least the surface. Because it is good, the cost of the low friction coefficient sliding member can be reduced, and the parts other than the sprayed layer can be made of a composite structure with the sprayed layer on the surface using ingot material. The advantage that the reduction in the strength of the sliding member with a low friction coefficient can be prevented as compared with the case where the sliding member is configured as described above. The thickness of the sprayed layer is preferably set to 2 mm or less.
When the thickness is more than 2 mm, the thermal sprayed layer is easily peeled off, and is not suitable as a sliding surface. The present invention can be applied to various mechanical structural parts, but can be particularly suitably applied to automobile parts.

Here, 1.67S + 1 ≦ Mo ≦ 1.67S
The reason for setting +7 is that a compound having a form close to MoS ₂ is easily formed in this composition range.

In the present invention, FeS does not precipitate in the form of a net in the sprayed layer as in a cast material, but precipitates in a finely dispersed form in the sprayed layer. Therefore, in the present invention, the generated FeS has no adverse effect on the thermal sprayed member (sliding member having a low friction coefficient).

In the present invention, C, Si, and Mn are used as the constituent elements of the powder in the amounts of C: 0.10 to 1.2% and S, respectively.
i: ≦ 2.0%, Mn: ≦ 2.0% can be contained (claim 2).

Further, if necessary, one or two of Ni and Cr are added to improve the hardenability and the mechanical properties, if necessary, Ni: ≦ 5.0%, Cr: ≦ 1. .5
It can be contained in a range of 0% (claim 3).

Further, if necessary, any one or two of V and W are used for the purpose of further improving the wear resistance.
3.0%, W: ≦ 1.0% can be contained (claim 4).

In the present invention, any of a method for producing powder by spraying gas onto molten steel, a method for producing powder by spraying water, and a rotating electrode method can be used as a method for producing powder. As for the powder, a spherical powder is preferable, and it is therefore desirable to use a gas atomization method capable of obtaining such a spherical powder.

In the present invention, the wear resistance of the sprayed layer can be effectively increased by adding a predetermined amount of wear-resistant particles such as metal carbide particles, metal nitride particles, and metal oxide particles. (Claims 5 and 6).

Next, the reasons for limiting the chemical components and the like in the present invention will be described in detail below. S: 1 to 10% S is an indispensable component for Mo sulfide formation. If it is less than 1%, the amount of the Mo _x S _y type compound is small, and the effect of improving the friction coefficient is small. Further, since the effect is saturated at 10%, the upper limit is set to 10% in the present invention.

Mo: 3 to 25% Mo is an essential component for forming Mo sulfide together with S. The lower limit is 3% and the upper limit is 25 in accordance with the amount of S.
%.

1.67S + 1 ≦ Mo ≦ 1.67S + 7 In order to effectively generate Mo sulfide, the amounts of Mo and S need to be limited to this range. When Mo is added in excess of 1.67S + 7, excess Mo forms brittle Fe-Mo compounds. Conversely, if Mo is less than 1.67S + 1, excess S forms a brittle Fe-S compound.

C (component contained in powder): 0.10 to 1.2
% C is an element useful for securing strength. However, 0.1
If it is less than 0%, the effect is poor. Conversely, excessive addition excessively promotes the precipitation of Mo carbide and adversely affects the formation of Mo sulfide, so the upper limit is made 1.2%.

Si: ≦ 2.0% Si is an element that is effective in reducing oxygen in molten steel, improves the flow of molten metal, and strengthens the material. Since the effect is saturated at 2.0%, the upper limit is set.

Mn: ≦ 2.0% Mn is an effective element for ensuring the hardenability of steel, but excessive addition promotes oxidation of the powder.
0%.

Ni: ≦ 5.0% Ni imparts hardenability and improves mechanical properties after quenching and tempering. However, excessive addition causes generation of retained austenite and lowers the hardness, so the upper limit is 5.0%.
And

Cr: ≦ 1.50% Cr is effective in securing the hardenability of steel, but excessive addition forms Mo and a sub-carbide and adversely affects the formation of Mo sulfide. .50%.

V: ≤3.0% V forms VC alone and is effective in imparting wear resistance. However, excessive addition may cause troubles such as clogging of a pouring nozzle during powder production, so the upper limit is set to 3.0%.

W: ≦ 1.0% W is effective for forming carbides to give abrasion resistance. However, excessive addition produces Mo and secondary carbides and adversely affects the formation of Mo sulfide, so the upper limit is made 1.0%.

Amount of C powder added to powder: 0.10 to 1.2% in total amount based on the whole mixed powder In the present invention, C powder such as graphite powder is further added to and mixed with powder having the above composition. This can be used to form a thermal spray layer. Here, the addition of the C powder is effective for securing the strength of the sprayed layer. However, if the content is less than 0.10%, the effect is poor. Conversely, an excessive addition of more than 1.2% excessively promotes the precipitation of Mo carbide and adversely affects the formation of Mo sulfide. Good range.

Addition amount of wear-resistant particles such as metal carbide, metal nitride and metal oxide powders: 1 to 15% in total It is desirable to add these powders in order to obtain wear resistance. If it is less than%, the effect is small, so that it is 1% or more. However, if it exceeds 15%, mixing is difficult, segregation occurs and the strength of the sprayed layer is reduced, so the upper limit is made 15%.

[0035]

Next, embodiments of the present invention will be described in detail. [Example 1] Using a 30 kg induction furnace, Fe-23% Mo was used.
-Powder of 4.1% S was produced by a gas atomization method. After the obtained powder was dried, it was classified to 200 mesh or less and subjected to a test. This powder was sprayed on an S45C plate with a high-speed flame sprayer to form a sprayed layer on the surface.

Here, the thermal spraying conditions were as follows. Gas: mixed gas of oxygen, H ₃ C ₆ , air Spray distance: 200 mm Spray rate: 30 g / min Thickness of sprayed layer: 0.5 mm

On the other hand, for comparison, Zn was added to the powder as a lubricant.
0.5% by weight of St (zinc stearate),
5t / c using a mold to a size of 0x10x50mm
molded at a pressure of m ^2, the green compact 1100 ° C. × 1h
r, Sintered in vacuum and subjected to test.

Further, for comparison, a commercially available S45C was used, and a test piece having the same shape was obtained by shaving and subjected to a test. The friction coefficient was measured under constant load and reciprocating motion under the condition of no lubrication and oil application. Here the load is 5
kg / mm ² , the coefficient of friction was measured at a stable point after 100 reciprocations. In the test, oil was applied to the surface of the test piece, and measurement was performed under two temperature conditions of room temperature and 300 ° C. The results are shown in Table 1.

[0039]

[Table 1]

From the results shown in Table 1, the material of the present invention is comparative material (S4
It can be seen that the coefficient of friction is lower than 5C).
Further, the sintered material of the same component and the material of the present invention have the same coefficient of friction under non-lubrication and oil application, and the effect does not change even at 300 ° C. From this result, it became clear that the same effect as that of the sintered material can be obtained at low cost by thermal spraying.

Although the embodiments of the present invention have been described in detail above, this is merely an example, and the present invention can be implemented in variously modified forms without departing from the gist thereof.

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[Procedure amendment]

[Submission date] September 7, 1999 (1999.9.7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Low friction coefficient sliding member

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-friction coefficient sliding member having a sprayed layer formed by spraying a low-friction coefficient powder on at least its sliding surface.

[0002]

2. Description of the Related Art Reducing the friction coefficient of the components of various mechanical structural parts, particularly automobile parts, reduces the mechanic loss (mechanical loss) and makes effective use of energy. Useful on

As a means for reducing the friction coefficient of the machine structural part, that the by fine precipitation of Mo _x S _y type of compound in construction material, to reduce the friction coefficient on the basis of the lubrication action of the Mo _x S _y Conceivable.

[0004] In the conventional Fe-Mo-S based casting material has been observed precipitation of this type Mo _x S _y type of compounds, some have been observed reduction in friction coefficient. However, in the case of such a cast material, FeS is simultaneously net-like (net-like).
In fact, FeS precipitated in the form of a net is a major cause of red-hot embrittlement, so that subsequent hot working cannot be performed, and it is not actually used industrially.

On the other hand, when a mechanical structure part such as an automobile part is constituted by a sintered body of powder, Mo is contained in the powder.
_{When an xSy-} type compound is precipitated, it is considered that the coefficient of friction can be similarly reduced. The present inventor has solved the above-mentioned problems of the cast material by sintering a powder having a predetermined composition, and has enabled industrialization (Japanese Patent Application No. Hei 9-14726).
6).

In the case of a sintered body of this powder, good performance was exhibited in terms of characteristics. However, in the case of a sliding member having a low coefficient of friction made of a sintered body, the whole was formed by sintering an expensive powder. Yes,
In addition to being disadvantageous in terms of cost and being expensive, there is an inherent problem that the whole is made of a sintered body, so that it is disadvantageous in terms of strength.

[0007]

The invention of the present application has been made in view of such circumstances. Claim 1
Low friction coefficient sliding member is a metal member,
S: 1-10%, Mo: 3.67S + 1 at 3-25%
≦ Mo ≦ 1.67S + 17 , characterized in that a sprayed layer of powder having a composition consisting of unavoidable impurities and Fe is formed at least on the sliding surface.

According to a second aspect of the present invention, there is provided a sliding member having a low coefficient of friction according to the first aspect, wherein the powder has a weight percentage of S: 1 to 10%, M
o: 1.67S + 1 ≦ Mo ≦ 1.67S + at 3 to 25%
17 and C: 0.10 to 1.2%, Si: ≦
2.0%, Mn: ≤2.0%, and has a composition consisting of unavoidable impurities and Fe.

According to a third aspect of the present invention, there is provided a low friction coefficient sliding member according to any one of the first and second aspects, wherein the powder further comprises one or two of Ni and Cr in weight% of Ni: ≦ 5.0. %, C
r: a composition containing ≦ 1.50%.

According to a fourth aspect of the present invention, there is provided the sliding member having a low friction coefficient according to any one of the first to third aspects, wherein the powder further comprises one or two of V and W in a weight% of V: ≦ 3.0. %, W: ≦ 1.
It is characterized by having a composition containing 0%.

According to a fifth aspect of the present invention, there is provided a sliding member having a low friction coefficient according to any one of the first to fourth aspects, wherein the powder further contains wear-resistant particles in a range of 1 to 15% by weight and in total. It is characterized by being.

According to a sixth aspect of the present invention, in the low friction coefficient sliding member according to the fifth aspect, the wear-resistant particles are made of one or more of metal carbide particles, metal nitride particles, and metal oxide particles. It is characterized by.

[0013]

The present invention relates to a composition containing Mo in excess of the solid solubility limit and S in an amount commensurate with the amount of Mo exceeding the solid solubility limit on at least the sliding surface of the metal member. % Of Mo: 3 to 25%, S: 1 to 10% and 1.6%
7S + 1 ≦ Mo ≦ 1.67S + 17 relationship obtained by forming a sprayed layer of powder having a composition satisfying the, case of a low friction coefficient sliding member of the present invention, the sprayed layer inside _Mo x _{S y} type of compound (FeMo _x S _y ) is finely precipitated and its Mo _x
Sprayed layer itself on the basis of the lubrication action of S _y, can be reduced and thus the friction coefficient of the sliding surface effectively.

Therefore, when the low-friction coefficient sliding member of the present invention is applied to a mechanical structural part, the friction coefficient of the mechanical structural part can be reduced, and the mechanic loss can be effectively reduced.

Further, the present invention forms a low-friction coefficient sliding member by forming a sprayed layer of powder on a sliding surface of a metal member, that is, only forming a sprayed layer on at least the surface. Because it is good, the cost of the low friction coefficient sliding member can be reduced, and the parts other than the sprayed layer can be made of a composite structure with the sprayed layer on the surface using ingot material. The advantage that the reduction in the strength of the sliding member with a low friction coefficient can be prevented as compared with the case where the sliding member is configured as described above. The thickness of the sprayed layer is preferably set to 2 mm or less.
When the thickness is more than 2 mm, the thermal sprayed layer is easily peeled off, and is not suitable as a sliding surface. The present invention can be applied to various mechanical structural parts, but can be particularly suitably applied to automobile parts.

Here, 1.67S + 1 ≦ Mo ≦ 1.67S
+ 17 and you doing is, MoS ₂ in the composition range
This is due to the fact that a compound having a form close to is easily formed.

In the present invention, FeS does not precipitate in the form of a net in the sprayed layer as in a cast material, but precipitates in a finely dispersed form in the sprayed layer. Therefore, in the present invention, the generated FeS has no adverse effect on the thermal sprayed member (sliding member having a low friction coefficient).

In the present invention, C, Si, and Mn are used as the constituent elements of the powder in the amounts of C: 0.10 to 1.2% and S, respectively.
i: ≦ 2.0%, Mn: ≦ 2.0% can be contained (claim 2).

Further, if necessary, one or two of Ni and Cr are added to improve the hardenability and the mechanical properties, if necessary, Ni: ≦ 5.0%, Cr: ≦ 1. .5
It can be contained in a range of 0% (claim 3).

Further, if necessary, any one or two of V and W are used for the purpose of further improving the wear resistance.
3.0%, W: ≦ 1.0% can be contained (claim 4).

In the present invention, any of a method for producing powder by spraying gas onto molten steel, a method for producing powder by spraying water, and a rotating electrode method can be used as a method for producing powder. As for the powder, a spherical powder is preferable, and it is therefore desirable to use a gas atomization method capable of obtaining such a spherical powder.

In the present invention, the wear resistance of the sprayed layer can be effectively increased by adding a predetermined amount of wear-resistant particles such as metal carbide particles, metal nitride particles, and metal oxide particles. (Claims 5 and 6).

Next, the reasons for limiting the chemical components and the like in the present invention will be described in detail below. S: 1 to 10% S is an indispensable component for Mo sulfide formation. If it is less than 1%, the amount of the Mo _x S _y type compound is small, and the effect of improving the friction coefficient is small. Further, since the effect is saturated at 10%, the upper limit is set to 10% in the present invention.

Mo: 3 to 25% Mo is an essential component for forming Mo sulfide together with S. The lower limit is 3% and the upper limit is 25 in accordance with the amount of S.
%.

1.67S + 1 ≦ Mo ≦ 1.67S +17  In order to generate Mo sulfide effectively, the amounts of Mo and S are
It is necessary to limit to this range. 1.67S +17Over
When Mo is added, excess Mo becomes brittle.
Form an object. Conversely, Mo is less than 1.67S + 1.
Otherwise, excess S forms brittle Fe-S compounds.

C (component contained in powder): 0.10 to 1.2
% C is an element useful for securing strength. However, 0.1
If it is less than 0%, the effect is poor. Conversely, excessive addition excessively promotes the precipitation of Mo carbide and adversely affects the formation of Mo sulfide, so the upper limit is made 1.2%.

Si: ≦ 2.0% Si is an element that is effective in reducing oxygen in molten steel, improves the flow of molten metal, and strengthens the material. Since the effect is saturated at 2.0%, the upper limit is set.

Mn: ≦ 2.0% Mn is an effective element for ensuring the hardenability of steel, but excessive addition promotes oxidation of the powder.
0%.

Ni: ≦ 5.0% Ni imparts hardenability and improves mechanical properties after quenching and tempering. However, excessive addition causes generation of retained austenite and lowers the hardness, so the upper limit is 5.0%.
And

Cr: ≦ 1.50% Cr is effective in securing the hardenability of steel, but excessive addition forms Mo and a sub-carbide and adversely affects the formation of Mo sulfide. .50%.

V: ≤3.0% V forms VC alone and is effective in imparting wear resistance. However, excessive addition may cause troubles such as clogging of a pouring nozzle during powder production, so the upper limit is set to 3.0%.

W: ≦ 1.0% W is effective for forming carbides to give abrasion resistance. However, excessive addition produces Mo and secondary carbides and adversely affects the formation of Mo sulfide, so the upper limit is made 1.0%.

Amount of C powder added to powder: 0.10 to 1.2% in total amount based on the whole mixed powder In the present invention, C powder such as graphite powder is further added to and mixed with powder having the above composition. This can be used to form a thermal spray layer. Here, the addition of the C powder is effective for securing the strength of the sprayed layer. However, if the content is less than 0.10%, the effect is poor. Conversely, an excessive addition of more than 1.2% excessively promotes the precipitation of Mo carbide and adversely affects the formation of Mo sulfide. Good range.

Addition amount of wear-resistant particles such as metal carbide, metal nitride and metal oxide powders: 1 to 15% in total It is desirable to add these powders in order to obtain wear resistance. If it is less than%, the effect is small, so it is set to 1% or more. However, if it exceeds 15%, mixing is difficult, segregation occurs and the strength of the sprayed layer is reduced, so the upper limit is made 15%.

[0035]

Next, embodiments of the present invention will be described in detail. 30
A powder of Fe-23% Mo-4.1% S was produced by a gas atomization method using a kg induction furnace. After the obtained powder was dried, it was classified to 200 mesh or less and subjected to a test. This powder was sprayed on an S45C plate with a high-speed flame sprayer to form a sprayed layer on the surface.

Here, the thermal spraying conditions were as follows. Gas: mixed gas of oxygen, H ₃ C ₆ , air Spray distance: 200 mm Spray rate: 30 g / min Thickness of sprayed layer: 0.5 mm

On the other hand, for comparison, Zn was added to the powder as a lubricant.
0.5% by weight of St (zinc stearate),
5t / c using a mold to a size of 0x10x50mm
molded at a pressure of m ^2, the green compact 1100 ° C. × 1h
r, Sintered in vacuum and subjected to test.

Further, for comparison, a commercially available S45C was used, and a test piece having the same shape was obtained by shaving and subjected to a test. The friction coefficient was measured under constant load and reciprocating motion under the condition of no lubrication and oil application. Here the load is 5
kg / mm ² , the coefficient of friction was measured at a stable point after 100 reciprocations. In the test, oil was applied to the surface of the test piece, and measurement was performed under two temperature conditions of room temperature and 300 ° C. The results are shown in Table 1.

[0039]

[Table 1]

From the results shown in Table 1, the material of the present invention is comparative material (S4
It can be seen that the coefficient of friction is lower than 5C).
Further, the sintered material of the same component and the material of the present invention have the same coefficient of friction under non-lubrication and oil application, and the effect does not change even at 300 ° C. From this result, it became clear that the same effect as that of the sintered material can be obtained at low cost by thermal spraying.

Although the embodiments of the present invention have been described in detail above, this is merely an example, and the present invention can be implemented in variously modified forms without departing from the gist thereof.

Claims (6)

[Claims] 1. A metal member having a weight percentage of S: 1 to 1
10%, Mo: 1.67S + 1 ≦ Mo ≦ at 3 to 25%
1.67S + 7 is satisfied, the balance is inevitable impurities and Fe
A sliding member having a low coefficient of friction, wherein a sprayed layer of a powder having a composition consisting of: is formed on at least a sliding surface thereof. 2. The powder according to claim 1, wherein S is 1 to 10% by weight and 1.67S + 1 ≦ Mo by 3 to 25% by weight.
Mo ≦ 1.67S + 7 is satisfied, and C: 0.10 to 1.2% Si: ≦ 2.0% Mn: ≦ 2.0% The composition is characterized by having a balance of unavoidable impurities and Fe. Low friction coefficient sliding member. 3. The powder according to claim 1, wherein the powder further contains one or more of Ni and Cr by weight% of Ni: ≦ 5.0% Cr: ≦ 1.50%. A sliding member having a low coefficient of friction characterized by having a composition as described above. 4. The powder according to claim 1, wherein said powder further contains V: ≦ 3.0% W: ≦ 1.0% by weight of one or two of V and W. A sliding member having a low coefficient of friction characterized by having a composition as described above. 5. The powder according to claim 1, wherein the powder further contains abrasion-resistant particles by weight in a total amount of 1 to 15%.
A low friction coefficient sliding member characterized by being included in the range of 6. The low friction coefficient sliding member according to claim 5, wherein the wear-resistant particles are made of one or more of metal carbide particles, metal nitride particles, and metal oxide particles. .