JPH05247667A - Sliding member excellent in initial fitness - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the durability of the coating layer formed on the sliding contact surface of the sliding contact member with the mating member and to improve the initial conformability of the sliding contact member. [Structure] A coating layer made of a modified silicon binder containing 1 to 25% by weight of hard and lubricous carbon spherical particles dispersedly formed is formed on a sliding contact surface with a mating member. As a result, the hard particles have lubricity and wear of the mating member and the sliding contact surface is suppressed. Further, a hard surface portion having a porous surface is formed on the sliding surface with the mating member, and a solid lubricant and hard particles having a particle size smaller than the surface roughness of the hard surface portion are formed on the surface of the hard surface portion. A coat layer is formed of a modified silicon-based binder that is dispersed and contained. As a result, the hard particles are fitted into the concave portion of the surface of the hard surface portion together with the coating layer containing the hard particles dispersed therein, and the abrasion of the mating member and the sliding contact surface is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding contact member excellent in initial conformability with a mating member.

[0002]

2. Description of the Related Art A member, such as a member forming a cylinder wall of an engine or a trochoidal surface of a rotor housing, which is in sliding contact with a counterpart member at a high load does not cause seizure or abnormal wear on the sliding contact surface at the beginning of use. Therefore, it is necessary to have good initial familiarity.

In order to provide the sliding contact member with an initial conformability, it is known that an uneven portion is formed on a sliding contact surface with a mating member and the oil film is held by the uneven portion. The concavo-convex portion for holding the oil film is formed by honing processing on the sliding contact surface, reverse electroplating of the plating or etching processing, or a porous rough surface of hard chrome plating applied to the sliding contact surface. It may be used as the uneven portion.

Further, in order to provide the sliding contact member with the initial conformability in which the heat resistance and the durability are improved as compared with the initial conformability obtained by the oil film, a hard material made of a metal oxide for enhancing the durability. It is also known to form a coating layer in which particles are dispersed and contained together with a solid lubricant on a sliding contact surface with a mating member.

Further, in Japanese Patent Laid-Open No. 60-50203, a nickel-fluorine composite plating layer is formed on the trochoidal surface of a rotor housing plated with chrome to prevent seizure on the sliding contact surface with a mating member. Techniques for preventing the occurrence are disclosed.

[0006]

However, the oil film held on the uneven portion formed on the sliding contact surface with the mating member easily breaks due to the fine projections on the sliding contact surface.
Since improvement of finishing accuracy and familiar operation are required, there are problems such as an increase in man-hours and a decrease in yield.

Further, in the sliding contact member in which the coating layer in which the solid lubricant and the hard particles made of the metal oxide are dispersedly contained is formed, the coating hardness of the above-mentioned coating layer is improved and the durability is improved by adding the hard particles. On the other hand, there is a problem that if the amount of added hard particles is too large, the wear of the mating member and the sliding contact surface is increased.

Further, when a coating layer containing a solid lubricant is formed on a sliding contact surface having an uneven portion, it is difficult to make the amount of the solid lubricant filled in the recess correspond to the area ratio of the recess. However, if the solid lubricant is insufficient, the durability of the coating layer cannot be sufficiently obtained.

Further, the sliding contact member having the composite plating layer formed on the sliding contact surface described in Japanese Patent Laid-Open No. 60-50203 has low productivity due to overlapping plating steps, resulting in an increase in cost. The problem occurs.

In view of the above, the present invention improves the initial conformability by improving the durability of the above-mentioned coating layer without increasing the abrasion of the counterpart member by the coating layer formed on the sliding contact surface. With the goal.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 is to improve the durability of a coat layer formed on a sliding contact surface with a mating member. The spherical particles made of a hard and lubricious material are used as the hard particles to be added to the above to prevent the wear of the mating member by the hard member.

Specifically, the means for solving the problems of the first aspect of the invention is to disperse 1 to 25% by weight of carbon spherical particles and the carbon spherical particles on the sliding contact surface with the mating member.
The coating layer is composed of a modified silicon-based binder of about 75% by weight.

Further, according to the invention of claim 2, spherical carbon particles are fitted into the concave portion of the surface of the hard plating layer formed on the sliding contact surface with the mating member, whereby the function of suppressing wear of the mating member is improved. Specifically, in the structure of claim 1, a hard plating layer having a porous surface is formed on a sliding contact surface with a mating member, and the coating layer is formed on the surface of the hard plating layer. Is added.

Further, according to the invention of claim 3, a hard surface portion having a porous surface is formed on the sliding contact surface, and when the coat layer is further formed, it is fine so that the hard surface portion can be fitted into the concave portion of the surface of the hard surface portion. By using the hardened particles, the wear of the mating member due to the hard particles is suppressed.

Specifically, in the means for solving the problems of the third aspect of the invention, a hard surface portion having a porous surface is formed on the sliding contact surface with the mating member, and the modified silicon-based material is formed on the surface of the hard surface portion. The coating layer is formed by dispersing and containing a solid lubricant and hard particles having a particle diameter smaller than the surface roughness of the hard surface portion in the binder.

According to a fourth aspect of the invention, the surface roughness of the hard plated layer is preferably based on the preferable surface roughness of the hard plated layer when the hard surface portion formed on the sliding contact surface with the mating member is formed by the hard plated layer. The particle diameter of FeCr ₂ O ₄ particles that can be fitted into the formed recesses is used. Specifically, in the structure of claim 3, the hard surface portion has a surface roughness of 1.6 to 4. 0
The hard particles are made of a hard plating layer having a thickness of 0.5 μm, and the hard particles are made of FeCr ₂ O ₄ particles having a particle diameter of 0.5 to 1.0 μm.

[0017]

According to the structure of the invention of claim 1, since hard and lubricous carbon spherical particles are used as the hard particles dispersedly contained in the coating layer formed on the sliding contact surface with the mating member, the mating member is used. Since the lubricity between the member and the sliding contact surface is good, the wear of the mating member is suppressed.

According to the constitution of the invention of claim 2, the spherical carbon particles dispersedly contained in the coat layer are fitted into the concave portion of the surface of the hard plating layer having a porous surface, and the friction between the spherical carbon particles and the counterpart member. Is reduced, the wear of the mating member is further suppressed.

According to the third aspect of the present invention, the hard particles which are dispersed and contained in the modified silicon-based binder together with the solid lubricant to form the coating layer are the hard surface portions having a porous surface formed on the sliding contact surface. The solid lubricant and the modified silicon-based binder are contained in the concave portion formed on the surface, and gradually appear on the sliding contact surface as the hard surface portion is worn, so that the wear of the mating member becomes extremely gentle. ..

According to the structure of the invention of claim 4, the hard surface portion is a hard plating layer having a surface roughness of 1.6 to 4.0 μm, and the hard particles are FeCr _{2 having} a particle diameter of 0.5 to 1.0 μm.
Since the particles are O ₄ particles, the hard particles, while being dispersedly contained in the coating layer, fit into the recesses formed on the surface of the hard surface portion.

[0021]

EXAMPLES Next, as a sliding contact member according to an example of the present invention, a rotary engine having a coating layer for improving initial conformability on a sliding contact surface on which an apex seal slides under high surface pressure is provided. The members forming the trochoidal surface will be described.

In the sliding contact member according to this embodiment, the following coat layer is formed on the surface of the trochoid material having the trochoid surface, or the surface of the trochoid material has a porous surface, for example, hard chrome plating. It is obtained by forming a hard surface portion such as a layer and then forming the following coat layer on the surface of the hard surface portion.

(Embodiment 1) The coating layer in the first embodiment has a hardness higher than that of graphite, and spherical carbon particles having both the function of a solid lubricant and the function of hard particles are bound by a modified silicon binder. However, hard particles made of metal oxide are not contained. An example of the composition ratio of the carbon spherical particles and the modified silicon-based binder in the coat layer forming material for forming the coat layer is shown below. The carbon spherical particles as solids (trade name: carbon microbead ICB-520, 18% by weight of Nippon Carbon Co., Ltd., and polyphenyl silicone (product number TS) as a modified silicone binder.
R116, manufactured by Toshiba Silicone Co., Ltd.) is 82% by weight.
The viscosity was adjusted by adding 0% by weight of xylene (commercial item of reagent first grade), and a coat layer was formed by the process as shown in FIG. 1 to process the trochoidal surface of the rotary engine. That is, after the oil and fat remaining on the surface of the trochoid material is degreased with acetone and cleaned, the coating layer forming material whose viscosity is adjusted by xylene is sprayed onto the trochoid material surface with an air pressure of ² kgf / cm ^2. .. Then, hold at 100 ℃ for 30 minutes to dry, then 200 ℃
Was baked for 40 minutes to produce a sliding contact member having a trochoidal surface on which the above coat layer was formed.

The xylene added during each step of drying and baking was scattered, and a trochoidal surface having a coating layer having a thickness of 30 μm, which was made of polyphenylsilicon in which spherical carbon particles were dispersed and contained, was obtained.

The hardness of the coat layer formed on the trochoidal surface of the rotary engine according to this example was measured. That is, coating layers having various composition ratios of spherical carbon particles and polyphenylsilicon in this example as shown in Table 1, graphite, FeCr ₂ O ₄ particles (hard particles made of metal oxide), and Table 3 shows the coating layers of the conventional examples having various composition ratios with polyphenyl silicon as shown in Table 2 and the composition ratios of graphite and polyphenyl silicon except the FeCr ₂ O ₄ particles from the conventional examples. The hardness was measured and compared with the coating layers of the comparative examples having various compositions as shown below.

[0026]

[Table 1]

[Table 2]

[Table 3] The surface hardness of each coating layer having the standard composition of this example, the conventional example and the comparative example was evaluated by the pencil hardness defined in JIS, and the results are shown in Table 4. According to the results shown in Table 4, it was confirmed that the coat layer of the present example had the same surface hardness as the coat layer of the conventional example containing the hard particles of the metal oxide. This indicates that the required film hardness of the coat layer is ensured by dispersing and containing spherical carbon particles having higher hardness and lubricity than graphite in the modified silicon-based binder.

[0027]

[Table 4] Next, the state of wear of the mating member sliding on the sliding contact surface on which the coat layer was formed in this example was tested to evaluate the extent to which the mating member was worn.

The wear test method was carried out by a pin-on-disk wear tester used for a normal wear measurement test. Each coat layer was formed on the sliding contact surface of the rotating disk, and a sealing material made of a chill casting having a Vickers hardness of 690 was pressed and slid on the sliding contact surface, and the amount of wear of the sealing material was measured.

The measurement condition is that the pressing load of the sealing material is 2
It was kgf / mm, and the peripheral speed of the rotating disk at the portion where the sealing material was pressed was 15 m / sec.

Each of the coating layers having the respective compositions in the present example shown in Table 1 above, the conventional example shown in Table 2 and the comparative example shown in Table 3 was tested for the degree to which the mating member was worn by the above-mentioned abrasion test method. , Type of solid lubricant contained in each coat layer (spherical carbon particles are used in the coat layer of the present embodiment, and graphite is used in each of the conventional example and the comparative example.)
2 shows the relationship between the wear state of the sealing material and. In FIG. 2, the vertical axis shows the degree of wear of the seal material (specific wear amount), and the horizontal axis shows the content of the solid lubricant.

According to the results shown in the graph of FIG. 2, in the coating layer of the conventional example, the coating layer is hard when the graphite content is up to about 15% by weight, so that the hard particles made of the metal oxide are used as the binder. It is less likely to wear the mating member because it is strongly fixed. However, if the content of graphite exceeds 15% by weight, the coating layer becomes soft and the hard particles easily reach the sliding contact interface, resulting in severe wear of the mating member. Further, since the coating layer of the comparative example does not contain hard particles, the coating layer is consumed early and it is not possible to prevent the mating member and the sliding contact surface from being mutually abraded.

On the other hand, in the coating layer of the present embodiment, the wear of the mating member is remarkably smaller than that of the conventional example using graphite when the content of the spherical carbon particles is in the range of 1 to 25% by weight. At the same time, hard particles made of metal oxide are not used, and hard spherical carbon particles having lubricity are dispersed in a binder made of polyphenylsilicon. Therefore, in the coating layer as compared with the conventional example and the comparative example. It is shown that it is possible to increase the amount of solid lubricant that can be dispersed in the.

If the content of the carbon spherical particles as a solid lubricant dispersed in the coating layer is less than 1% by weight, the lubricity of the coating layer cannot be obtained. Since the amount is relatively insufficient, the coat layer becomes brittle, and the coat layer easily peels off, so that the mating member and the sliding contact surface are likely to wear each other.

Further, the durability of the lubricating effect in the coating layer of this example was measured, and it is shown in FIG. 3 together with the durability of the lubricating effect in the conventional example and the comparative example. The measurement of the persistence of the lubrication effect was carried out by the above-mentioned wear test method for all of the standard compositions in the evaluation of the surface hardness described above, the conventional example and the comparative example, and the wear amount of the sealing material on the vertical axis, The abscissa indicates the distance of friction.

According to the results shown in the graph of FIG. 3, the coating layer of this embodiment scarcely wears the mating member even with long-distance friction, and has the effect of reducing the wear of the mating member for a long time. It was confirmed that there is.

Next, a hard chrome plating layer having a porous surface was formed as a hard plating layer having a porous surface on the surface of the trochoid material, and a coating layer according to this example was formed on the surface of the hard chrome plating layer. .. Also in this coat layer, the required film hardness was secured, and the wear of the mating member was significantly reduced, and the long-term lubrication effect was obtained.

(Embodiment 2) In the coating layer in the second embodiment, a solid lubricant and hard particles are bound by a modified silicon binder, and the coating layer is formed to have the particle diameter of the hard particles. It is smaller than the surface roughness of the surface. An example of the composition ratio of the solid lubricant, the hard particles, and the modified silicon-based binder in the coat layer forming material for forming the coat layer is 5% by weight of graphite as the solid lubricant, FeCr ₂ O ₄ particles (metal oxide particles) having a particle diameter of 0.5 to 1.0 μm as hard particles were 23% by weight, and polyphenyl silicon as a modified silicon-based binder (used in the first example). The same) as 72% by weight.

First, in order to form a hard surface portion having a porous surface on the surface of the trochoid material, a hard chromium plating layer having a surface roughness in the range of 1.6 to 4.0 μm was formed.

To the coating layer-forming material having the above composition, about 30% by weight of xylene (commercial product of the first grade reagent) was externally added to adjust the viscosity, and the step shown in FIG. The same procedure as in Example 1 was repeated, and the above 1.6 to 4.0 was performed.
A coat layer was formed on the surface of the hard chrome plating layer having a surface roughness of μm.

The xylene added during each step of drying and firing scatters and is a 30 μm film made of polyphenyl silicon in which graphite and FeCr ₂ O ₄ particles having a particle size of 0.5 to 1.0 μm are dispersed and contained. A trochoidal surface was obtained in which the coat layer having a thickness was formed on the surface of the hard chromium plating layer having a surface roughness of 1.6 to 4.0 μm.

FeCr ₂ O dispersedly contained in the coating layer
The wear amount of the sealing material was measured by the above wear test method for various combinations between the particle size of the _four particles and the surface roughness of the hard chrome plating layer on which the coat layer is formed, and the results are shown in FIG. In FIG. 4, the vertical axis represents the degree of wear of the seal material (specific wear amount), the horizontal axis represents the surface roughness of the hard chromium plating layer, and the FeCr ₂ O ₄ particles have a particle size of 0. It is each measured value when changing to 5 μm, 1 μm, 5 μm, and 10 μm.

According to the results shown in the graph of FIG. 4, when the surface roughness of the hard chromium plating layer is in the range of 1.6 to 4.0 μm, the FeCr ₂ O ₄ particles have a particle diameter of 0.5 to 1.
It was confirmed that the wear of the sealing material was significantly reduced when the structure was set to 0 μm.

In the second embodiment, when a solid lubricant having a high hardness is used instead of graphite as the solid lubricant, it can be used by forming particles having a particle size of 0.5 to 1 μm. Needless to say.

On the trochoidal surface as the sliding member having the above-mentioned structure, graphite as a solid lubricant and FeCr ₂ O ₄ particles as hard particles form a porous surface together with polyphenyl silicon as a modified silicon binder. It is fitted in the concave portion of the rough surface formed on the surface of the hard chromium plating layer as the hard surface portion. As a result, wear is suppressed by the lubricating action of graphite in the coating layer, and FeCr ₂ O ₄ particles have the function of enhancing the durability of the coating layer and smoothing the fine projections of the sealing material that is the counterpart member. The overall function is maintained until the hard chrome plating layer is worn and lost, and the long-lasting lubricating effect can be obtained.

[0045]

As described above, according to the sliding contact member having excellent initial conformability according to the invention of claim 1, since hard and lubricous carbon spherical particles are used as the hard particles, the mating member is used. Since the lubricity between the sliding contact surface and the sliding contact surface is good and wear of the mating member is suppressed, excellent initial conformability can be obtained.

According to the second aspect of the invention, the spherical carbon particles are fitted into the recesses on the surface of the hard plating layer, and the friction between the spherical carbon particles and the mating member is reduced. However, the lubricating effect continues and the initial running-in property is further improved.

According to the sliding contact member having excellent initial conformability according to the invention of claim 3, the particle diameter of the hard particles dispersedly contained in the coating layer is the surface of the hard surface portion on which the coating layer is formed. The surface roughness of the hard surface portion is smaller than that of the hard surface portion, so that the hard surface portion gradually appears on the sliding contact surface as the hard surface portion wears, and the wear of the mating member becomes gentle. Therefore, excellent initial familiarity can be obtained.

According to the invention of claim 4, the hard surface portion is a hard plating layer having a surface roughness of 1.6 to 4 μm, and the hard particles are FeCr ₂ O having a particle diameter of 0.5 to 1.0 μm.
_Since the hard particles are _four particles, the hard particles are fitted into the recesses formed on the surface of the hard plating layer while being dispersedly contained in the coat layer, so that hardening that reduces wear of the mating member can be reliably obtained.

That is, according to the inventions of claims 1 to 4, by forming on the sliding contact surface a coating layer containing hard particles of a metal oxide dispersed therein as in the prior art. The resulting problem of significant wear of the mating member is eliminated.

Further, since the spherical carbon particles have a low specific gravity and the hard particles are made finer by averaging the particle diameters, the hard particles in the present invention are prevented from settling in the coating layer forming material. Therefore, the coating layer forming material can be stored for a long period of time.

[Brief description of drawings]

FIG. 1 is a process drawing showing a trochoid surface processing process according to first and second embodiments of the present invention.

FIG. 2 is a graph showing the relationship between the solid lubricant content and the specific wear amount in the first example of the present invention.

FIG. 3 is a graph showing the relationship between the friction distance and the amount of wear in the first embodiment.

FIG. 4 is a graph showing the relationship between the surface roughness of the hard chrome plating layer and the specific wear amount in the second embodiment of the present invention.

Claims (4)

[Claims] 1. The sliding contact surface with a mating member has 1 to 25% by weight.
A sliding contact member having excellent initial conformability, characterized in that a coating layer composed of the spherical carbon particles described above and 99-75% by weight of a modified silicon binder in which the spherical carbon particles are dispersed is formed. 2. A hard plating layer having a porous surface is formed on a sliding contact surface with a mating member, and 1 to 25% by weight of carbon spherical particles and the carbon spherical particles are dispersed on the surface of the hard plating layer. A sliding contact member having excellent initial conformability, characterized in that a coat layer composed of 99 to 75% by weight of a modified silicone binder is formed. 3. A hard surface portion having a porous surface is formed on a sliding contact surface with a mating member, and the hard surface portion has a surface.
A sliding contact excellent in initial familiarity, characterized in that a modified silicon-based binder is formed with a coating layer in which a solid lubricant and hard particles having a particle diameter smaller than the surface roughness of the hard surface portion are dispersed and contained. Element. 4. The hard surface portion has a surface roughness of 1.6 to
Made of a hard plated layer of 4.0 .mu.m, the hard particles sliding excellent initial conformability of claim 3, characterized in that the particle size is from FeCr ₂ O ₄ particles 0.5~1.0μm Contact member.