JPH0618964B2 - Sliding member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sliding member. More specifically, the present invention relates to a sliding part member having improved wear resistance without containing metal powder as a filler.

[Conventional technology]

Since tetrafluoroethylene resin is excellent in heat resistance, chemical resistance, sliding properties, etc., it is widely used as a sealing material, but when it is used alone, the amount of deformation by external force is large and the amount of wear is also large. , And various fillers have been blended therein.

As the filler, glass fiber, carbon fiber, metal powder, etc. are used, but in recent years, the use study under severe conditions has increased, and the conventional PV has a limit PV value (PV value It is used as a reference for mutual comparison of bearing materials and is expressed as a function of pressure P and sliding surface speed V. The higher this value, the better the pressure resistance and speed resistance. It is difficult to meet such demands. Further, when the metal powder is used as the filler, the wear powder contains the metal powder, which may cause a defect such as damage to the mating material.

[Problems to be solved by the invention]

The present inventor, as a result of various investigations for a method for improving the wear resistance of the sliding member, without using a metal powder that may cause such problems,
It has been found that such a problem can be solved by using oil coke powder as one component of the mixed powder that is fired to form the sliding member.

[Means for solving problems]

Therefore, the present invention relates to a sliding member, which is 3 to 20% by weight of carbon fiber, 3 to 20% of oil coke powder, and the balance is made of tetrafluoroethylene resin powder. It is obtained by firing the mixed powder.

As carbon fiber, generally, the single yarn diameter is about 10 to 15 μm,
A fiber having a fiber length of about 0.1 to 0.4 mm is used. Oil coke powder is obtained by crushing petroleum coke produced in the distillation step of crude oil, and its particle size is about 30 ~
Irregularly shaped porous particles with a size of 200 μm are used. The tetrafluoroethylene resin powder generally has an average particle size of about 30 to 50 μm and an average molecular weight of about 10,000 to 10 μm.
Thousands are used.

The blending ratio between the specified components is an effective range for achieving the object of the present invention, and when each component is used in a smaller ratio, it lowers the limit PV value, and in a larger ratio than this. The mechanical strength is lowered.

The mixed powder consisting of the above components is thoroughly mixed with a mixer or the like, and then placed in a mold of a predetermined shape to obtain about 700 to 900 kgf /
The preform is preformed under a pressure of cm ² , and the temperature of the preform is raised from room temperature to 375 ° C. in about 3 hours, held at this temperature for about 3 hours, and then returned to room temperature in about 10 hours. Thus, it is fired in the firing furnace. The fired product is then processed into a desired shape and formed into a sliding member such as a bearing.

[Operation] and [Effect] The sliding member according to the present invention has the following features.

(1) Since the carbon fibers and the oil coke powder are entangled with each other and reinforce each other, the mechanical characteristics of the obtained sliding member, such as the compressive strength and the limiting PV value, can be increased.

(2) Fine irregularities are formed on the surface of the sliding member by the carbon fibers and the oil coke powder, and the fine surface irregularities are also present on the oil coke powder surface, and the lubricating liquid is retained therein. It has high lubrication performance,
Exhibits excellent sliding characteristics.

(3) The obtained sliding member has high heat resistance, can be normally used at 260 ° C, and has good corrosion resistance. In addition, since the abrasion powder does not contain metal powder, no trouble such as damage to the mating material occurs.

〔Example〕

 Next, the present invention will be described with reference to examples.

Examples 1 to 3 and Comparative Examples 1 to 3 Mixed powders having the compositions (parts by weight) shown in the following table were preformed by a compression molding method and then fired at 360 to 380 ° C for about 3 hours, and the fired products were worn. The coefficient was measured. This measurement was carried out using a Suzuki friction and wear tester under the conditions of load 8 kg / cm ² , speed 0.5 m / sec, time 48 hours, mating material S45C, and no environmental lubrication. The results obtained are shown in the following table.

Table Example Comparative Example 1 2 3 1 2 3 [Composition] Carbon fiber 5 10 15 10 -5 Oil coke powder 15 10 5 -20-Artificial graphite-----15 (Average particle size 100 μm or less) Tetrafluoroethylene Resin powder 80 80 80 90 80 80 [Abrasion coefficient] 10 ^-6 cm / (kg / cm ² ) (m / sec) hr 7.3 8.6 10.6 11.3 18.2 2
8.9 From these results, it can be seen that carbon fiber and oil coke powder synergistically reduce the wear coefficient.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F16C 33/24 6814-3J F16J 15/20 7197-3J // (C10M 111/04 107: 38 103 : 02) C10N 30:06 40:02 50:08

Claims (1)

[Claims] 1. A carbon fiber having a weight ratio of 3 to 20
%, Oil coke powder 3 to 20%, and the balance being a member for a sliding portion obtained by firing a mixed powder of tetrafluoroethylene resin powder.