JPH06228330A - Multilayer sliding material - Google Patents

Abstract

PURPOSE:To provide a material excelling in load-carrying capacity and resistant against the seizure and fixation on the mating member caused by abrasion without detriment to the heat resistance. CONSTITUTION:The material is obtained by mixing a thermoplastic resin such as a thermoplastic polyimide with a solid lubricant such as graphite, impregnating an aromatic polyamide fiber, a carbon fiber or a mixture thereof with the obtained mixture to obtain a first sliding material, and laminating a second sliding material, prepared by impregnating a woven fabric made of at least one fiber selected from among an aromatic polyamide fiber, a carbon fiber and a glass fiber with a thermosetting resin and curing the resin, with the surface of the first sliding material by adhesive bonding or heat fusion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer sliding material which is a raw material of a sliding member such as a bearing and is made of a plurality of materials.

[0002]

2. Description of the Related Art As an example of a conventional multi-layer sliding material, a sintered layer of copper-based metal particles is integrally formed on the surface of a metal substrate,
One in which a fluororesin layer is integrally formed on the concave portion of the sintered layer and its surface (described in JP-A No. 61-24846), or while filling the pores of the porous metal intermediate layer, and on the bearing material It is known that the composition comprises a composition based on polytetrafluoroethylene that forms the surface layer (described in JP-A-61-21421).

However, since the above-mentioned conventional multi-layer sliding material is inferior in wear resistance, it is excessively worn especially under high load,
There is a problem that the copper particles that make up the sintered layer are crushed, and as a result, the metal substrate is exposed and seized on the mating member,
It has the drawback of sticking.

As one method for solving this problem, there is a method in which glass fibers are hardened with an epoxy resin as an outer layer and a polytetrafluoroethylene woven fabric is bonded as an inner layer.

[0005]

However, the above-mentioned polytetrafluoroethylene woven fabric is inferior in abrasion resistance and therefore has a drawback that it cannot withstand a sliding condition under a high load.

[0006] Therefore, an object of the present invention is to provide a multi-layer sliding material which complements load resistance without impairing heat resistance and has a small wear amount even under a sliding condition of high load.

[0007]

In order to solve the above problems, the present invention provides a thermoplastic resin containing a solid lubricant in a woven fabric in which either aromatic polyamide fiber or carbon fiber is used alone or in combination of both. The impregnated first sliding material and the second sliding material obtained by impregnating a woven cloth composed of one or more kinds of fibers selected from aromatic polyamide fibers, carbon fibers and glass fibers with a thermosetting resin and curing the same. That is, the structure in which the layers are integrated is adopted. The details will be described below.

The thermoplastic resin used in the present invention includes a thermoplastic polyimide resin (for example, "Aurum" manufactured by Mitsui Toatsu Chemicals, Inc.), a polyether ether ketone resin (for example, "Victrex PEEK" manufactured by ICI), a poly Ether sulfone resin (for example, "Victrex PES" manufactured by ICI), polyether nitrile resin (PE
N), polyphenylene sulfide resin, polyetherimide resin and the like.

As the solid lubricant filled in the thermoplastic resin, molybdenum disulfide, molybdenum trioxide, carbon, mica, talc, graphite, calcium fluoride, calcium carbonate, magnesium oxide, polytetrafluoroethylene resin is used. Powder, tin oxide, etc.
These materials can be used alone or in appropriate combination.

The mixing method of the thermoplastic resin and the solid lubricant described above is not particularly limited, and the raw materials may be individually supplied to the melt mixer, or a Henschel mixer, a ball mill, a tumbler mixer may be used in advance. After dry-mixing using a mixer such as the above, it may be melt-mixed with a hot roll, a kneader, a Banbury mixer, a screw extruder or the like to form a pellet as a molding material. The filling amount of the solid lubricant is preferably 10 to 40%. This is because if the amount is less than 10%, the effect of the invention is not exhibited, and if the amount exceeds 40%, the workability is impaired. The particle size is preferably 50 μm or less so as not to impair the impregnation property.

Then, in order to form a film, the above-mentioned mixed materials are uniaxially or biaxially equipped with a vertical or horizontal T die.
It is extruded into a sheet by an axial screw extruder, and cooled and molded by a vertical or horizontal roll take-up device heated at room temperature.

The aromatic polyamide fiber may be either para-type or meta-type, and examples thereof include Kevlar manufactured by DuPont, Conex manufactured by Teijin, and Technora. The carbon fiber may be either bread-based or pitch-based.

The above-mentioned fibers are used alone or in combination to form a woven fabric, and the film-like thermoplastic resin containing the above-mentioned solid lubricant is melt-impregnated to obtain a sliding material having a thickness of 100.
It is preferable to be set to ˜1000 μm. When the thickness is less than 100 μm, the wear life is short, and when the thickness is more than 1000 μm, the flexibility is deteriorated and the moldability is impaired.

As a method for joining the sliding material impregnated with the thermoplastic resin containing the solid lubricant and the sliding material impregnated with the thermosetting resin and cured, adhesion or heat fusion is used. In addition, when a thermosetting resin is impregnated and cured into a woven fabric in which aromatic polyamide fibers, carbon fibers or glass fibers are used alone or in combination, they can be joined by appropriately pressing.

[0015]

The multi-layer sliding material according to the present invention comprises the first sliding material impregnated with the thermoplastic resin containing the solid lubricant,
It can exhibit excellent load resistance.

Further, since the second sliding material impregnated with the thermosetting resin is laminated and integrated on the outside of the first sliding material, the first sliding material is worn out. However, the second sliding material does not stick to the mating member due to seizure.

[0017]

EXAMPLES The present invention will now be described in more detail by way of examples.

First, the raw materials of the sliding materials used in Examples and Comparative Examples are collectively shown as follows. The abbreviations are shown in parentheses, and the mixing ratio is shown by weight.

(1) Thermoplastic polyimide resin (PI): Mitsui Toatsu Chemical Co., Ltd .: Aurum # 450 (2) Polyetheretherketone resin (PEEK) ICI: Victrex PEEK (3) Polytetrafluoroethylene resin ( PTFE) Kitamura Co., Ltd .: KTL600 (4) Graphite (GRP) Nippon Graphite Co., Ltd .: Graphite ACP [Examples 1 to 4] The above raw materials were mixed at the ratios shown in Table 1 to form pellets, and then the thickness was obtained. It was formed into a film of 50 μm. This was sandwiched between three woven fabrics (thickness 150 μm) of carbon fiber plain weave, and melted by hot pressing.
It was impregnated into a sheet material having a thickness of about 500 μm.

A pipe formed by applying a one-component adhesive (Cemedine 110: Cemedine 110) on one surface of each of the above sheet materials and fixing a glass woven cloth with an epoxy resin to have an outer diameter of 45 mm, an inner diameter of 35 mm, and a length of 20 mm. A test piece was obtained by adhering to the inner surface of the. The following test was carried out using this test piece, and the results are shown in Table 1.

Abrasion test: Using a radial type abrasion tester,
Apply a load of 2000 kgf / cm ^{2 with} the mating material SUJ2,
The test shaft was rotated to measure the amount of wear after sliding for 500 minutes in a continuous operation without lubrication at a sliding speed of 1.8 m / min.

[0022]

[Table 1]

[Examples 5 and 6] The above raw materials were mixed in the proportions shown in Table 1 to form pellets, and the thickness was 50 μm.
Was formed into a film. This was sandwiched between three woven fabrics (thickness 150 μm) in which aramid fiber was plain-woven, and melted and impregnated by hot pressing to obtain a sheet material having a thickness of about 500 μm.

Using this sheet material, the above Examples 1 to 4
As a result of carrying out the same test by the same method as described above, a usable product was obtained.

Comparative Example A test piece obtained by bonding a polytetrafluoroethylene woven fabric to the inner surface of a pipe formed by hardening a woven glass fabric with an epoxy resin to form an outer diameter of 45 mm, an inner diameter of 35 mm and a length of 20 mm. The same test as that of the above-mentioned example was conducted using the above, and the results are also shown in Table 1.

As is clear from the results shown in Table 1, in Examples 1 to 4 in which the sliding material impregnated with the thermoplastic resin containing the solid lubricant was used as the inner layer, the wear amount was remarkably higher than that of the Comparative Example. Diminished.

[0027]

INDUSTRIAL APPLICABILITY As described above, the present invention has the inherent heat resistance of the thermoplastic resin, and since the solid lubricant is mixed in the thermoplastic resin to impregnate the woven cloth, The occupying resin layer becomes thin, heat dissipation can be improved, and the temperature rise of the sliding surface can be prevented.

Further, since the woven cloth impregnated with the thermosetting resin and hardened is laminated and integrated, the sliding material is not seized due to abrasion and is not fixed to the mating member, and the composite material having excellent load resistance is obtained. A layer sliding material can be provided.

Claims (1)

[Claims] 1. A first sliding material obtained by impregnating a woven fabric containing either or both of aromatic polyamide fibers and carbon fibers with a thermoplastic resin containing a solid lubricant, aromatic polyamide fibers and carbon fibers. And a second sliding material obtained by impregnating a woven cloth made of one or more kinds of fibers selected from glass fibers with a thermosetting resin and curing it, and laminating and integrating the second sliding material.