阅读说明：本技术 滑动构件用树脂材料及滑动构件 (Resin material for sliding member and sliding member ) 是由 堀部直树 川井徹 于 2018-05-22 设计创作，主要内容包括：根据本发明一个实施方式的滑动构件用树脂材料包含80体积％以上的聚酰亚胺树脂、总计9.5体积％至20体积％(包含)的石墨和硬质物、以及相对于聚酰亚胺树脂的0.1重量％以上的硅烷偶联剂以及其余不可避免的杂质。(A resin material for a sliding member according to one embodiment of the present invention includes 80 vol% or more of a polyimide resin, 9.5 vol% to 20 vol% in total (inclusive) of graphite and a hard substance, and 0.1 wt% or more of a silane coupling agent and the balance of unavoidable impurities with respect to the polyimide resin.)

1. A resin material for a sliding member, comprising:

80% by volume or more of a polyimide resin;

9.5 to 20 vol.% of graphite and a hard material in total;

0.1% by weight or more of a silane coupling agent relative to the polyimide resin; and

the rest is inevitable impurities.

2. The resin material for a sliding member according to claim 1, wherein,

the total content of the graphite and the hard material is 15 vol% or less.

3. The resin material for a sliding member according to claim 1 or 2, wherein,

the content of the graphite is 9 to 18 vol%.

4. The resin material for a sliding member according to claim 3, wherein,

the content of the graphite is 15 vol% or less.

5. The resin material for a sliding member according to any one of claims 1 to 4, wherein,

the content of the hard substance is not less than 0.5% by volume and not more than 3% by volume.

6. The resin material for a sliding member according to any one of claims 1 to 5, wherein,

the content of the polyimide resin is 90 vol% or more.

7. The resin material for a sliding member according to any one of claims 1 to 6, wherein,

the polyimide resin is a high strength polyimide resin.

8. The resin material for a sliding member according to any one of claims 1 to 7, wherein,

the resin material does not contain MoS₂。

9. A slide member, comprising:

a base material;

a sintered metal layer formed on the base material,

a resin layer formed on the sintered metal layer and formed of the resin material for a sliding member according to any one of claims 1 to 8.

Technical Field

The present invention relates to a resin material for a sliding member, and to a sliding member using the resin material.

Background

As a resin material for the sliding member, it is known in the art to add graphite to a binder resin to form a resin material. Patent document 1 discloses a resin material containing substantially spherical graphite particles.

Disclosure of Invention

Technical problem

In the material disclosed in patent document 1, there is room for improvement with respect to fatigue resistance of the resin material.

The present invention provides a resin material for a sliding member, which has improved fatigue resistance.

Technical scheme

The present invention provides a resin material for a sliding member, comprising: 80% by volume or more of a polyimide resin; 9.5 to 20 vol.% of graphite and a hard material in total; 0.1% by weight or more of a silane coupling agent relative to the polyimide resin; and inevitable impurities.

The total content of graphite and hard matter may be 15 vol% or less.

The content of graphite may be 9% by volume or more and 18% by volume or less.

The content of graphite may be 15 vol% or less.

The content of the hard substance may be 0.5 vol% or more and 3 vol% or less.

The content of the polyimide resin may be 90 vol% or more.

The polyimide resin may be a high-strength polyimide resin.

The resin material for sliding members may not contain MoS₂。

The present invention also provides a sliding member comprising a base material, a sintered metal layer formed on the base material, and a resin layer formed on the sintered metal layer, the resin layer being formed of the above-described resin material for a sliding member.

Technical effects

The present invention provides improved fatigue resistance in a resin material for a sliding member.

Drawings

Fig. 1 is a view showing a sectional structure of a slide member 1 according to an embodiment.

Brief description of the drawings

1. A sliding member; 11. a base material; 12. a sintered layer; 13. a resin layer; 131. a binder resin; 132. additive agent

Detailed Description

1. Configuration of

Fig. 1 shows an exemplary structure of a slide member 1 according to an embodiment in cross section. The slide member 1 is a slide member used as a liner in a fuel injection pump, for example. The slide member 1 includes a base material 11, a sintered layer 12, and a resin layer 13. The base material 11 is a layer that provides both the shape and mechanical strength of the sliding member 1. The base material 11 is formed of, for example, steel. The base material 11 is a back metal. The sintered layer 12 improves adhesion between the resin layer 13 and the base material 11, and is a sintered metal layer formed of metal powder (e.g., powder of copper or copper alloy).

The resin layer 13 is formed of a resin material for a sliding member. The resin material includes a binder resin 131 and an additive 132 dispersed in the binder resin 131. As the binder resin 131, for example, a thermosetting resin, more specifically, at least one of a Polyimide (PI) resin and a polyamide imide (PAI) resin, for example, can be used. In order to improve fatigue resistance, it is preferable to use a PI resin instead of the PAI resin; and among the PI resins, it is preferable to use a PI resin having high strength (herein, "high strength" means a PI resin having a tensile strength of 150MPa or more). In order to improve fatigue resistance, the content of the binder resin in the resin layer 13 is preferably large, for example, 80 vol% or more, more preferably 83 vol% or more, further preferably 85 vol% or more, and further preferably 90 vol% or more.

The additive 132 is a substance that improves the characteristics of the resin layer 13, and may contain, for example, a solid lubricant 1321, a hard substance (hard particles) 1322, and a silane coupling agent (the silane coupling agent is not shown). The solid lubricant 1321 is an additive for reducing the friction coefficient of the resin layer 13, and includes, for example, graphite and MoS₂At least one of (1). Preferably, graphite is used instead of MoS₂As the solid lubricant 1321. This is because in some cases MoS is present₂The possibility of aggregation in the resin layer. When graphite is used as the solid lubricant 1321, in order to reduce the friction coefficient, it is preferable that the graphitization degree is high, for example, 95% or more, more preferably 99% or more. The hard material 1322 is a material for improving seizure resistance and abrasion resistance of the resin layer 13, and contains, for example, at least one of clay, mullite, and talc. The silane coupling agent is a substance for enhancing the bonding between the binder resin 131 and the solid lubricant 1321.

In order to improve fatigue resistance, the content of the additive is preferably small, for example, 20 vol% or less, more preferably 17 vol% or less, further preferably 15 vol% or less, and further more preferably 10 vol% or less in total. In order to reduce the friction coefficient, the content of the solid lubricant is preferably large, for example, 9 vol% or more. In order to reduce the total amount of additives, it is preferable that the content of the solid lubricant is small, for example, 18 vol% or less. In order to improve seizure resistance and wear resistance, the content of the hard substance is preferably large, for example, 0.5 vol% or more. In order to reduce the total amount of additives, the content of the solid lubricant is preferably small, for example, 3 vol% or less. For adding both the solid lubricant and the hard substance, preferably, the content of the solid lubricant is 9% by volume or more and 17% by volume or less, further preferably 14% by volume or less; and preferably the hard substance content is between 0.5 and 3 vol%. Preferably, the content of the silane coupling agent with respect to the binder resin is, for example, 0.1 wt% or more, more preferably 0.2 wt% or more. In order to reduce the cost, the content of the silane coupling agent with respect to the binder resin is preferably 5% by weight or less, and more preferably 3% by weight or less, for example.

In order to reduce the surface roughness after the cutting process, it is preferable that the particle diameter of the material used as the additive 132 is small; for example, it is preferable that the average particle size of the additive 132 is smaller than the average particle size of the metal powder for the sintered layer 12. Further, it is preferable that both the solid lubricant 1321 and the hard material 1322 have an average particle diameter of 5 μm or less, and more preferably an average particle diameter of 3 μm or less.

Since the resin layer 13 functions as a sliding member, it is preferable that the fatigue resistance strength (i.e., fatigue surface pressure) be 55MPa or more. The method for measuring the fatigue surface pressure will be described later. In order to improve the fatigue resistance of the resin layer 13, it is preferable that the average particle diameter of the solid lubricant 1321 used as the material is small; for example, it is preferably twice or less the average particle diameter of the hard substance 1322, and more preferably smaller than the average particle diameter of the hard substance 1322.

The fatigue resistance of the resin layer 13 decreases as the content of the additive 132 increases. In the present embodiment, the fatigue resistance is improved by suppressing the content of the additive.