JPS62127227A - Member for sliding part - Google Patents

Abstract

PURPOSE:To manufacture a sliding member with low wearability by sintering the mixture of aromatic polyamide fiber and tetrafluoroethylene resin powder at a specified ratio. CONSTITUTION:The mixed powder consisting of about 1-30wt% of aromatic polyamide fiber such as poly-p-phenyleneterephthalether amide as represented by the formula attached and about 99-70wt% of tetrafluoroethylene resin powder is put in the predetermined mold so as to be preformed under a pressure of about 700-900kg/cm<2>. After that, the preformed mixed powder is raised its temperature from room temperature to 375 deg.C by spending 3hr and, after that, held at 375 deg.C for about 3hr and finally brought back to room temperature by spending about 10hr. The obtained sintered product is used for a sliding member such as bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a member for a sliding part. More specifically, the present invention relates to a member for a sliding part that reduces abrasion of itself and a mating member.

[Prior Art] and [Problems to be Solved by the Invention] Tetrafluoroethylene resin is widely used as a sealing material because of its excellent heat resistance, chemical resistance, and sliding properties. If this alone is used, the amount of deformation due to external force is large;
In addition, since the amount of wear is large, various fillers are mixed therein.

By the way, the mating material for sliding parts is increasingly being made of aluminum due to the recent trend toward weight reduction.
Conventional parts filled with glass fiber, carbon fiber, various metal powders, etc. wear out the mating aluminum material, so
There are difficulties in actual use.

For this reason, there is a strong demand for members for sliding parts that not only have low self-abrasive properties but also reduce the abrasive properties of the mating material. It has been found that by using it in combination with tetrafluoroethylene resin powder, a product that can fully meet these requirements can be obtained.

[Means for solving the problem] and [Operation] Therefore, the present invention relates to a member for a sliding part, and this member for a sliding part has the following features:
It is obtained by firing a mixed powder of about 1 to 30% by weight of aromatic polyamide fiber and about 99 to 70% by weight of tetrafluoroethylene resin powder.

The aromatic polyamide fibers used are, for example, poly-P-phenylene terephthaletheramide fibers represented by the following general formula, which are generally pulp-like and have a cut fiber length of 10 μm to 5 mm. This fiber, also called aramid fiber, has characteristics such as low density, high tensile strength, high modulus, toughness, and good thermal stability.

In addition, 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 50 μm.
5oooo is used.

These aromatic polyamide fibers and tetrafluoroethylene resin powder are about 1 to 30% by weight of the former and about 99% by weight of the latter.
Each is used in a proportion of ~70% by weight. If the proportion of aromatic polyamide fiber used is less than this, the effect of reducing the abrasion of self and mating material, which is the objective of the present invention, cannot be obtained, while even if the proportion is greater than this, the effect of reducing abrasion is not obtained. There is no particular increase beyond that, and on the contrary, it causes a decrease in mechanical strength.

The mixed powder consisting of each of these components is thoroughly mixed using a mixer, etc., and then put into a mold with a predetermined shape, and the powder has a powder of about 700 to 90
Preforming is carried out under a pressure of 00 kg/cJ, and the temperature of this preform is raised from room temperature to 375°C over, for example, 3 hours, held at this temperature for about 3 hours, and then returned to room temperature over about 10 hours. In this way, it is fired in a firing furnace.

The fired product is then processed into a desired shape and formed into a member for a sliding part, such as a bearing.

〔Effect of the invention〕

The sliding member of the present invention obtained by filling aromatic polyamide fibers in tetrafluoroethylene resin has a higher self- and mating material resistance than conventional members filled with glass fiber, carbon fiber, various metal powders, etc. can significantly reduce the abrasiveness of

〔Example〕

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

Examples 1 to 4, Comparative Examples 1 to 2 Tetrafluoroethylene resin (Mitsui Fluorochemical Products Teflon 7-J) was added with aromatic polyamide fiber and carbon fiber (Kureha Chemical Products Co., Ltd.) in the weight percent shown in the table below. Tsubu M2O1S; fiber length 0.13mm, fiber diameter 14.5μ
■) or bronze powder [Fukuda Metal Products Br5At-2
000; Apparent density 4.2-5.2 g/1ffl, particle size distribution (metshu weight %) +200 <5, +2
50 <Is, +3505~35, -350 55~
85] was preformed and fired in the manner described above, and the self-wear coefficient and wear amount of the mating material were measured for the fired product.

(Self-wear coefficient) The friction surfaces of the test piece and the mating material (545C in Examples 1 to 3, ADC12/T6 treatment in Example 4 and Comparative Examples 1 to 2) were cleaned with alcohol, etc., and then mounted on the test machine. , operate under the required conditions.

After the test piece and the mating material have returned to room temperature after running for a specified period of time, the wear surface of the test piece is measured using a shape measuring device, and the wear height is read. Then, from the following equation, the self-wear coefficient K (
C11)/(kg/ad)(m/sec)(hr).

P: Load (kg/aJ) V: Speed m/sec) H2 hours (hr) L: Wear height (!II) (Amount of wear on mating material) The same mating material used to measure the self-wear coefficient Using material, load 8 kg/aJ, speed 0.5 m/sec 1 hour 24 hours
The amount of wear (μm/hr) when sliding under conditions of r was measured using a micrometer.

The results obtained are shown in the following table.

table [Filler 1% by weight]

Claims (1)

[Claims] 1. A member for a sliding part obtained by firing a mixed powder of about 1 to 30% by weight of aromatic polyamide fiber and about 99 to 70% by weight of tetrafluoroethylene resin powder.