Sliding member and manufacturing method thereof

Abstract

The present invention provides a sliding member having an inner metal layer, a bearing alloy layer, and an intermetallic compound. The bearing alloy layer is laminated on the back metal layer, and forms a sliding surface on the side opposite to the back metal layer. The intermetallic compound is contained in the structure of the bearing alloy layer, is harder than the average hardness of the entire bearing alloy layer, and has a larger average particle size on the side closer to the sliding surface than on the side closer to the metal layer in the bearing alloy layer.

Description

technical field [0001] The present invention relates to a sliding member and a method of manufacturing the same. Background technique [0002] A sliding member used in a bearing device has a bearing alloy layer on a surface that slides with a counterpart member. The bearing alloy layer is used as a sliding member by being laminated with an inner metal layer such as steel. In order to reduce the burden on the environment, it is required to use a material that does not contain components such as Cd and Pb, for example, as the bearing alloy layer. Conventionally, a material that does not contain substances that impose a burden on the environment and satisfies the need for high strength has been proposed for a bearing alloy layer mainly composed of Sn or Cu (see Cited Documents 1 and 2). [0003] In the case of citing Document 1, intermetallic compounds precipitated in the bearing alloy layer are miniaturized by adding Co, Mn, Sc, Ge, etc. to Sn—Sb—Cu, which is a component of ...

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Problems solved by technology

[0004] However, in either of the conventional technologies, the strength of the bearing alloy layer of the sliding member is improved, but the wear resistance cannot be sufficiently ensured.

That is, in the case of citing Document 1, since the intermetallic compound contained in the bearing alloy layer becomes micronized, it is easy to fall off from the bearing alloy layer as the sliding surface wears out.

Therefore, there is a problem that the wear of the bearing alloy layer is increased and the wear resistance is lowered.

Similarly, in the case of citing Document 2, even if the strength of the parent phase of the bearing alloy layer is increased, the miniaturized intermetallic compounds tend to fall off from the bearing alloy layer, and the wear resistance decreases.

On the other hand, when the particle size of the intermetallic compound is increased to improve the wear resistance of the bearing alloy layer, cracks are likely to occur from the interface between the parent phase and the intermetallic compound

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