JP2005170960A - Sliding member, lubricating coating film, coating material for the film, and method for coating surface of sliding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating coating film excellent in sliding properties including abrasion resistance, scorching resistance and tendency to lower coefficient of friction even if used under severe sliding conditions. <P>SOLUTION: The lubricating coating film comprises a solid lubricant and a binder holding the solid lubricant on the surface of a base. The binder consists of a composite material a binder resin and silicon nitride microparticles( reinforcing particles ) dispersed in the binder resin. The amount of the solid lubricant is 30-120 pts. wt. based on 100 pts. wt. of the binder resin. Since a large quantity of the solid lubricant is stably held by the robust binder, this lubricating coating film is excellent in abrasion resistance as well as scorching resistance and tendency to lower coefficient of friction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lubricious coating composed of a solid lubricant, a coating for a lubricious coating suitable for forming the lubricating coating, a sliding member provided with the lubricating coating on the surface of a substrate, and a surface coating method thereof.

  When the two members make relative motion while being in sliding contact, high lubricity is required between the members from the viewpoint of seizure resistance, a low friction coefficient, and the like. The degree of lubricity varies depending on the type of equipment, the usage environment, the surface properties of the sliding member, and the like, but a severer member that is operated at high speed and high load is required to have higher lubricity. For example, in the case of a mechanical device or the like, the lubricity between sliding members is often ensured by lubricating oil or grease. However, depending on the usage environment, lubricating oil or grease may not be used or sufficient sliding characteristics may not be ensured by themselves. Therefore, in order to ensure or improve the sliding characteristics between the sliding members, a lubricating film made of a solid lubricant is often provided on the surface of the base material. However, since it is difficult to sufficiently adhere the solid lubricant alone to the surface of the base material, the lubricant film is usually formed by adhering and holding the solid lubricant to the surface of the base material with a binder resin. Disclosure relating to such a lubricious coating is disclosed, for example, in Patent Documents 1 to 3 below.

Japanese Patent Laid-Open No. 11-13638 JP 2001-158855 A JP 2001-11372 A

  Patent Document 1 discloses a lubricious coating film having a two-layer structure of a sliding contact layer and an intermediate layer. According to this lubricating coating, the intermediate layer remains on the surface of the base material even if the outermost sliding contact layer is worn out, so that the sliding characteristics are prevented from being deteriorated. However, since the wear resistance of the sliding contact layer itself is insufficient, it is still easy to wear.

  Patent Document 2 discloses a precision sliding component in which a solid lubricant is held with a binder in which a fibrous reinforcing agent is added to a specific resin, and a resin composition thereof. In the specification of Patent Document 2, there is a description that a silicon nitride fiber may be used as the fibrous reinforcing agent, but there is no example, and the fibrous reinforcing agent actually used is a fiber having a fiber diameter of 10 μm. A glass fiber having a length of about 3 mm. The reason why the fibrous reinforcing agent is added to the binder resin in the case of Patent Document 2 is to reduce the dimensional stability of the part made of the above composition, that is, the linear expansion coefficient. Furthermore, Patent Document 2 targets parts that are used in a room temperature range with a relatively low load and low speed, and does not assume sliding characteristics under severe conditions.

  Patent Document 3 includes polytetrafluoroethylene (PTFE) as a solid lubricant, polyamideimide (PAI) as a binder resin, and silicon nitride whisker, and the composition of PTFE and PAI is 5 to 10 by weight. / 95 to 90, and a coating composition containing 1 to 10 parts by weight of silicon nitride whiskers with respect to 100 parts by weight of the total amount of PTFE and PAI is disclosed. Even if the lubricating coating of Patent Document 3 exhibits sufficient wear resistance, the blending amount of PTFE, which is a solid lubricant, is very small, so high seizure resistance and low friction coefficient cannot be achieved, Not suitable for use under severe sliding conditions. Although Patent Document 3 describes that silicon nitride particles having an average particle diameter of about 0.1 to 5.0 μm may be used instead of the silicon nitride whiskers, There is no example regarding.

  The present invention has been made in view of such circumstances. That is, an object of the present invention is to provide a lubricious coating excellent in sliding properties such as wear resistance, seizure resistance and low friction coefficient even when used under severe sliding conditions. Another object of the present invention is to provide a lubricating coating material suitable for forming the lubricating coating and a sliding member provided with the lubricating coating on the substrate surface. Furthermore, it aims at providing the surface coating method of the sliding member which forms the lubricous film on the base-material surface together.

  As a result of extensive research and trial and error, the inventor has come up with the idea of forming a binder that holds a solid lubricant with a composite material of a binder resin and silicon nitride fine particles, and based on this. The present invention has been completed.

(Sliding member)
That is, the sliding member of the present invention is a sliding member composed of a base material and a lubricating film formed on the surface of the base material and having excellent sliding characteristics,
The lubricating coating consists of a solid lubricant and a binder that holds the solid lubricant on the substrate surface,
The binder is composed of a composite material of a binder resin and fine particles of silicon nitride (Si ₃ N ₄ ) and reinforcing particles dispersed in the binder resin to reinforce the binder resin. 30 to 120 parts by weight of the solid lubricant is included with respect to 100 parts by weight of the binder resin.

  The sliding member of the present invention includes a lubricating coating excellent in sliding characteristics such as seizure resistance, wear resistance, and a low friction coefficient. Therefore, the sliding member of the present invention can be used in various apparatuses, but is particularly suitable for an apparatus used under severe sliding conditions.

By the way, it is not necessarily certain why the lubricating coating exhibits excellent sliding characteristics, but the present situation is considered as follows.
First, the lubricating coating of the present invention has a relatively high solid lubricant content. For this reason, it is excellent in lubricity in a sliding part, and even under severe sliding conditions, high seizure resistance and reduction of the friction coefficient can be achieved. Note that the reduction of the friction coefficient also leads to effects such as efficiency improvement by reducing various losses and suppression of temperature rise of the sliding portion due to heat generation.

  Next, when the content of the solid lubricant in the lubricating coating increases as described above, the amount of the binder that holds the solid lubricant relatively decreases, so that conventionally, the solid lubricant is stably held. Otherwise, the wear resistance of the lubricating coating may be greatly reduced. However, in the lubricating coating of the present invention, the binder that holds the solid lubricant is not simply composed of the binder resin, but is composed of a composite material that is reinforced by dispersing reinforcing particles in the binder resin. That is, the binder resin that is the main component of the binder is reinforced by the reinforcing particles. Therefore, even if the amount of the solid lubricant increases and the amount of the binder relatively decreases, the solid lubricant can be firmly held.

  Various kinds of such reinforcing particles are conceivable, and when the present inventor tried various kinds of reinforcing particles, it was found that silicon nitride fine powder was suitable. That is, according to a binder made of a composite material of a binder resin and silicon nitride fine particles, a large amount of solid lubricant is firmly and stably held and does not easily fall off, and the seizure resistance of the lubricating coating is impaired. It has been found that the wear resistance is greatly improved. Incidentally, when alumina particles, silica particles, or silicon carbide particles, which are inorganic particles similar to silicon nitride, are used as reinforcing particles, the resulting lubricating coating has good wear resistance, but results in reduced seizure resistance. It became. Thus, it is considered that the sliding member of the present invention has developed excellent seizure resistance, a low friction coefficient, and wear resistance due to the lubricating coating.

(Lubricating film)
The present invention can be grasped not only as the sliding member but also as the above-described lubricating coating.
That is, the present invention is a lubricating coating formed on the surface of a substrate and having excellent sliding properties,
A solid lubricant and a binder that holds the solid lubricant on the substrate surface;
The binder is composed of a composite material of a binder resin and fine particles of silicon nitride (Si ₃ N ₄ ) and reinforcing particles dispersed in the binder resin to reinforce the binder resin, and the solid lubricant is the binder It can also be grasped as a lubricating coating characterized by being contained in an amount of 30 to 120 parts by weight with respect to 100 parts by weight of the resin.

(Lubricant coating)
The present invention can also be grasped as a paint (or paint composition) suitable for forming the lubricating film.
That is, the present invention is a paint for a lubricating coating that is applied to the surface of a substrate to form a lubricating coating with excellent sliding properties,
A lubricant film comprising: a binder resin; 30 to 120 parts by weight of a solid lubricant with respect to 100 parts by weight of the binder resin; and reinforcing particles made of silicon nitride (Si ₃ N ₄ ) fine particles. It can also be grasped as a paint.

(Sliding member surface coating method)
Moreover, this invention can be grasped | ascertained also as the surface coating method for forming a lubricous film on the base-material surface of the sliding member mentioned above.
That is, the present invention provides a lubricant in which reinforcing particles composed of 30 to 120 parts by weight of a solid lubricant and silicon nitride (Si ₃ N ₄ ) fine particles are dispersed in 100 parts by weight of the binder resin in a varnish of the binder resin. A coating process for applying the coating material for the conductive film to the surface of the substrate, and a baking process for heating and baking the coating film formed after the coating process,
It can also be grasped as a surface covering method for a sliding member, characterized in that a lubricating film in which the solid lubricant is held by the binder resin reinforced by the reinforcing particles can be formed on the surface of the base material.

  The present invention will be described in more detail with reference to embodiments of the invention. In addition, the content described in this specification including the following embodiments includes not only the lubricating coating according to the present invention and the sliding member provided with the same, but also the coating material for the lubricating coating and the surface coating method of the sliding member. In addition, it should be noted that it can be applied as appropriate. It should be noted that which embodiment is best depends on the target, required performance, and the like.

Next, the present invention will be described in more detail with reference to embodiments.
(1) Solid lubricant The lubricant film of the present invention contains 30 to 120 parts by weight of a solid lubricant with respect to 100 parts by weight of the binder resin, and the content is 35 to 55 parts by weight. preferable. In other words, if the entire lubricating coating is 100% by mass, the solid lubricant is preferably contained in an amount of 20 to 50% by mass and 20 to 30% by mass. If the amount of solid lubricant is too small, the seizure resistance and low friction coefficient of the lubricating coating will be inferior, and if the amount of solid lubricant is excessive, the amount of binder in the lubricating coating will be relatively reduced and solid lubrication will occur. The wear resistance is reduced by dropping off the agent. However, since the optimum range of the solid lubricant varies depending on the type of the solid lubricant and the application and specification of the lubricating coating, it is preferable to adjust appropriately within the above range.

Such solid lubricants include polytetrafluoroethylene (PTFE), ethylene tetrafluoroethylene (ETFE), tetrafluoroethylene hexafluoropropylene copolymer (FEP), molybdenum disulfide (MoS ₂ ), tungsten disulfide (WS _2). ), Calcium fluoride (CaF ₂ ), graphite (C), boron nitride (BN), and the like. The content of the solid lubricant is in a particularly suitable range when PTFE is used as the solid lubricant, and a part of the PTFE may be replaced with the other solid lubricant within the range. . Further, when the solid lubricant is in the form of a powder having an average particle size of 0.01 to 10 μm, more preferably 0.1 to 1 μm, the dispersibility of the solid lubricant in the paint for a lubricating coating is increased and thus obtained. The coated surface becomes smooth.

  The solid lubricant may be pretreated with a coupling agent in order to improve adhesion to the binder resin, dispersibility in the binder resin, and the like. Furthermore, the lubricating coating may contain various additives in combination with the solid lubricant in order to improve its sliding characteristics.

(2) Binder (a) Binder Resin The binder resin is the main component of the binder that holds the solid lubricant on the surface of the base material. The binder resin is preferably a heat-resistant resin, particularly a thermosetting resin, so that the lubricating coating can exhibit stable sliding characteristics even under severe sliding conditions. Examples of such binder resins include polyimide resins such as polyamide imide (PAI) and polyimide (PI), epoxy resins, and phenol resins. Among these, PAI is preferable in terms of cost and sliding characteristics.

(B) Reinforcing Particles The reinforcing particles of the present invention are mainly composed of fine particles of silicon nitride, and are dispersed in a binder resin to form a binder composed of a strong composite material. Thereby, the solid lubricant is stably held, and further, since the reinforcing particles are hard themselves, the wear resistance of the binder layer itself is also improved, and the wear resistance of the lubricating coating is synergistically enhanced.

  The average primary particle size of the reinforcing particles (particularly the average primary particle size of silicon nitride) is preferably 1 μm or less, 0.5 μm or less, and more preferably 0.1 μm or less. More specifically, the average primary particle size is preferably about 25 nm, 40 nm, or 80 nm. When this average primary particle size is small, the reinforcing particles are finely dispersed in the binder resin, the binder is uniformly strengthened, and the surface of the lubricating coating tends to be smooth. However, if the average primary particle size is too small, the production becomes difficult and expensive. In addition, it is not preferable because handling becomes difficult, and it becomes easy to form secondary particles by aggregation or the like. On the other hand, when the average primary particle size is excessive, the opponent attack is increased, which is not preferable. In particular, when the sliding mating member is made of a soft material (for example, Al, Mg, or an alloy thereof), good sliding characteristics cannot be maintained with the sliding member of the present invention. Here, the average primary particle diameter is a particle diameter of a single particle, and is obtained from a measurement by a laser diffraction method or an observation image by an electron microscope or the like.

  In addition, since the reinforcing particles are fine powder, it is preferable to use particles that have been dispersed in advance in a solvent or the like in order to avoid aggregation and deterioration of handling properties. Examples of such a solvent include N-methyl-2-pyrrolidone, xylene, toluene, γ-butyro-lactone, diacetone alcohol, and the like. In addition, the solvent used at this time is exhausted and removed in a later-described drying step or firing step.

  The reinforcing particles are preferably contained in the lubricating coating in an amount of 1 to 100 parts by weight, 5 to 50 parts by weight, or 15 to 20 parts by weight with respect to 100 parts by weight of the binder resin. If the amount of reinforcing particles is too small, the above-described effect is poor. If the amount of reinforcing particles is excessive, the binder resin that is the main component decreases and a good binder is not formed.

The reinforcing particles of the present invention are mainly composed of fine particles of silicon nitride, but some of them may be replaced with other fine particles within the above range.
The reinforcing particles may be pretreated with a coupling agent in order to improve adhesion to the binder resin, stable dispersibility in the binder resin, and the like.

(C) Coupling agent Inclusion of a coupling agent in the binder resin improves the adhesion between the lubricating coating (particularly the binder resin) and the substrate or reinforcing particles, or the dispersibility of the reinforcing particles in the binder resin. To do. The type of coupling agent to be used is appropriately selected in consideration of the binder resin, reinforcing particles, solid lubricant, or material of the base material. For example, silane coupling agent, titanate coupling agent, aluminate cup A ring agent etc. are typical. According to the tests conducted by the present inventors, the silane coupling agent was most suitable. By the way, silane coupling agents include vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2- (3,4 epoxy cyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycol. Sidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldi Ethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropylmethyldimethoxysilane, N-2 (aminoethyl) 3- Aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3- Dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, special aminosilane, 3-ureidopropyltri Ethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis (triethoxysilylpropyl) tetrasulfide, 3-isocyanatopropyltriethoxysilane There is.

  In particular, when polyamideimide is used as the binder resin, preferred silane coupling agents are 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene). Propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane and / or 3-isocyanatopropyltriethoxysilane. In particular, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyl having an epoxy group as a functional group Triethoxysilane is preferred. Incidentally, these four points are excellent in storage stability.

  By the way, the coupling agent is preferably contained in an amount of 1 to 15 parts by weight, 1 to 10 parts by weight, and further 1 to 4 parts by weight with respect to 100 parts by weight of the binder resin. When the amount of coupling agent is too small, the above-mentioned effects are poor, and when the amount of coupling agent is excessive, the amount of binder resin is relatively reduced and the sliding properties (wear resistance, etc.) and adhesion of the lubricating coating are lowered. is there.

  As described above, the coupling agent may be used for the pretreatment of the solid lubricant and the reinforcing particles, but when the coupling agent is added to the binder resin and kneaded with the solid lubricant and the reinforcing particles. More preferred. This is because not only the adhesion between the binder resin and the solid lubricant or the reinforcing particles, but also the adhesion between the binder resin and the base material is ensured at the same time.

(3) Base material and sliding member The base material constituting the sliding member is provided with a sliding surface on at least one surface, and the sliding surface is coated with a lubricating film to constitute the sliding member of the present invention. . The material of the base material may be any material such as aluminum alloy, magnesium alloy, steel, cast iron, resin, etc., and may be any shape such as plate shape, cylindrical shape, and spherical shape.

  The type of the sliding member of the present invention and the apparatus in which it is incorporated, the usage environment, etc. are not limited. However, since the sliding member of the present invention has a lubricating film that exhibits excellent sliding characteristics, it is suitable as a member used under severe sliding conditions. Specific examples include pistons for internal combustion engines, swash plates for air conditioner swash plate compressors, shoes, shafts, bearing races, and the like.

  Although the required sliding characteristics vary depending on the use of the sliding member, the thickness of the lubricating coating of the present invention is preferably 0.1 to 120 μm, 10 to 100 μm, and more preferably 20 to 60 μm. If the lubricating film is too thin, stable sliding characteristics cannot be ensured in the long term, and if the lubricating film is too thick, it takes a long time to form the lubricating film, resulting in high costs.

(4) Surface coating method The surface coating method of the present invention comprises a step of applying and baking a paint in which a solid lubricant and reinforcing particles are dispersed in a varnish of a binder resin to a base material of a sliding member. The coating material to be used is preferably added with an appropriate amount of an appropriate coupling agent and adjusted to a viscosity according to the coating method with a solvent or the like.

  The coating process can be performed by brush painting, spray coating, immersion in a paint bath, or the like. More specifically, for example, a known coating method such as a roller, roll coater, air spray, airless spray, electrostatic coating, electrodeposition coating, or screen printing may be used.

  The firing step is a step in which the coating film applied to the substrate surface is heated under a predetermined condition to form a strong lubricating coating and to adhere the lubricating coating to the substrate surface. This baking step may also serve as a drying step for drying the coating film after the coating step. In addition, the binder resin made of a thermosetting resin is cured by crosslinking and the like in this baking process.

The present invention will be described more specifically with reference to examples.
(Example)
(1) Preparation of Lubricant Coating Coating Material PAI resin varnish as a binder resin, PTFE powder as a solid lubricant (average primary particle size: 0.3 μm), and silicon nitride powder (average primary particle size: 40 nm) And a silane coupling agent were added.

  The blending ratio was 100% by mass (hereinafter, simply expressed as “%”) for the entire formed lubricating film, PAI: 60%, PTFE: 27%, silicon nitride: 11%, silane coupling Agent: 2%. When this is expressed as a ratio when PAI is 100 parts by weight, PTFE: 45 parts by weight, silicon nitride: 18 parts by weight, and silane coupling agent: 3 parts by weight.

  The PAI resin varnish is obtained by dissolving a PAI resin in a solvent. The proportions were as follows: Solvent: 70% by mass (n-methyl-2-pyrrolidone 56% by mass, xylene 14% by mass), PAI resin: 30% by mass when the entire varnish was 100% by mass. Silane coupling agents include 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyl. Triethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, 3-isocyanatopropyltriethoxy Silane was used. Furthermore, when the silicon nitride powder is unevenly distributed, the silicon nitride powder may be pretreated with this silane coupling agent, or the silicon nitride powder may be dispersed in advance in the following solvent or the like.

  The mixture was well stirred to fully disperse the silicon nitride powder and the silane coupling agent in the PAI resin varnish. A solvent (n-methyl-2-pyrrolidone, xylene or a mixture thereof) was appropriately added thereto to adjust the viscosity to obtain a paint for a lubricating coating.

(2) Surface treatment A round bar (φ19 mm) of carbon steel (S55C) was prepared, and the above-mentioned lubricating coating material was applied to the degreased outer peripheral surface by air spray (application process). And the apply | coated round bar was put into the heating furnace which consists of an 80 degreeC air atmosphere, it was made to dry, exhausting, and the coating film was formed on the surface of the round bar (drying process). This was further heated at 230 ° C. for 1 hour in the same heating furnace to fire the PAI resin (firing step). Thus, the lubricating coating referred to in the present invention was formed on the surface of the round bar. However, in this example, the surface of the obtained lubricating coating was further machined to adjust the thickness of the lubricating coating to 30 μm.

(Comparative example)
A paint for a lubricating coating which does not contain the above silicon nitride and silane coupling agent in the PAI resin varnish was prepared. Using this, a lubricating coating was formed on the surface of the round bar in the same manner as in the above example. In addition, the compounding ratio of the solid lubricant (PTFE) with respect to 100 parts by weight of the PAI resin varnish is the same as that in the above example.

(Evaluation)
A sliding evaluation test was conducted with a journal testing machine using the test pieces (round bars provided with a lubricating coating) obtained in the above-described Examples and Comparative Examples. A semi-arc bearing made of a high silicon aluminum alloy (A390) was used as the sliding material. The sliding surface was cut, and the surface roughness was set to Rz (10-point average roughness): 3.2 or less (measured values were Rz: 2.5 to 3.0). Incidentally, the surface roughness of the lubricating coating formed on the surface of the test piece was Rz 1.5 to 2.5.

  An evaluation test as schematically shown in FIG. 1 was performed using this sliding counterpart material and each test piece. That is, the inner peripheral surface 1 a of the two bearings 1 was held in contact with the outer peripheral surface of the test piece 2 provided with the lubricious coating, and the round bar was rotated while applying a load to the bearing 1. The test conditions at this time were sliding speed: 6.0 m / s, load: 2000 N, lubrication state: lubricating oil application, test time: 20 seconds.

  After the completion of this test, the surface roughness of the lubricating coating was measured with a surface roughness meter to determine the maximum wear depth. As a result, the maximum wear depth was 4.2 μm in the example, whereas the maximum wear depth was 28.3 μm in the comparative example. That is, it was confirmed that in the case of the test piece (sliding member) provided with the lubricating coating of the present invention on the surface, the wear resistance was remarkably improved as compared with the specimen provided with the conventional lubricating coating.

It is a principal part perspective view of a journal bearing testing machine.

Explanation of symbols

1 Sliding partner 2 Test piece (sliding member)

Claims (12)

A substrate;
A sliding member formed on the surface of the base material and having a lubricating coating having excellent sliding characteristics,
The lubricating coating consists of a solid lubricant and a binder that holds the solid lubricant on the substrate surface,
The binder is composed of a composite material of a binder resin and silicon nitride (Si ₃ N ₄ ) fine particles and reinforcing particles dispersed in the binder resin to reinforce the binder resin.
The sliding member according to claim 1, wherein the lubricating coating contains 30 to 120 parts by weight of the solid lubricant with respect to 100 parts by weight of the binder resin.   The sliding member according to claim 1, wherein the reinforcing particles have an average primary particle size of 1 μm or less.   The sliding member according to claim 2, wherein the average primary particle size is 100 nm or less.   The sliding member according to claim 1, wherein the lubricating coating contains 1 to 100 parts by weight of the reinforcing particles with respect to 100 parts by weight of the binder resin. The binder resin is mainly composed of polyamideimide,
The sliding member according to claim 1, wherein the solid lubricant is mainly made of polytetrafluoroethylene (PTFE).   The sliding member according to claim 1, wherein the lubricating coating further includes a coupling agent that improves adhesion between the binder resin and the base material or the reinforcing particles.   The sliding member according to claim 6, wherein the lubricating coating contains 1 to 50 parts by weight of the coupling agent with respect to 100 parts by weight of the binder resin. The sliding member according to claim 6 or 7, wherein the coupling agent mainly comprises a silane coupling agent.   The sliding member according to claim 1, wherein the lubricating coating has a thickness of 0.1 to 120 μm. A lubricious coating formed on the surface of a substrate and having excellent sliding properties,
A solid lubricant and a binder that holds the solid lubricant on the substrate surface;
The binder is composed of a composite material of a binder resin and silicon nitride (Si ₃ N ₄ ) fine particles and reinforcing particles dispersed in the binder resin to reinforce the binder resin.
The lubricating coating according to claim 1, wherein the solid lubricant is contained in an amount of 30 to 120 parts by weight with respect to 100 parts by weight of the binder resin. A coating for a lubricating coating that is applied to the surface of a substrate to form a lubricating coating with excellent sliding properties,
A binder resin,
30 to 120 parts by weight of a solid lubricant with respect to 100 parts by weight of the binder resin;
A lubricating coating composition comprising reinforcing particles comprising fine particles of silicon nitride (Si ₃ N ₄ ). Based on a paint for a lubricious coating, in which reinforced particles comprising fine particles of 30 to 120 parts by weight of a solid lubricant and silicon nitride (Si ₃ N ₄ ) are dispersed in 100 parts by weight of the binder resin in a varnish of the binder resin. An application process for applying to the surface of the material;
A heating step of heating and baking the coating film formed after the coating step,
A method for coating a surface of a sliding member, characterized in that a lubricant film in which the solid lubricant is held by the binder resin reinforced by the reinforcing particles can be formed on the surface of the base material.

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