Sliding member

Abstract

Provided is a sliding member which has high seizure resistance though an overlay layer comprising Ag as the main component is used therein. The sliding member of an embodiment comprises a base and an overlay layer which is disposed on the sliding-side surface of the base and which comprises Ag as the main component and contains Al. The overlay layer comprising Ag as the main component is relatively soft. Due to this, the overlay layer comprising Ag as the main component can ensure high seizure resistance even when the use of Pb is avoided. Furthermore, the overlay layer comprising Ag as the main component has excellent thermal conductivity. Due to this, frictional heat generating at the sliding part rapidly dissipates to the base side.

Description

TECHNICAL FIELD[0001]The present invention relates to a sliding member.BACKGROUND ART[0002]Conventionally, a sliding member of a slide bearing for an internal-combustion engine etc. comprises an overlay layer on a sliding-side surface of a base such as a steel back plate. For such an overlay layer, there is proposed an overlay layer which comprises Ag as a main component and to which In, Sn, Bi, or the like is added, in order to obtain sliding characteristics to the same degree as those of a sliding member containing Pb, while avoiding the use of Pb (Patent Literature 1).[0003]However, although In, Sn, and Bi are softer than Ag, their thermal conductivities are extremely smaller than that of Ag. Therefore, an overlay layer which comprises Ag as a main component and to which In, Sn, or Bi is added cannot easily dissipate the heat generated in the sliding part with a mating member, to the base side. As a result, the temperature of an overlay layer of this type easily rises under sever...

AI Technical Summary

Benefits of technology

The present invention provides a sliding member with an Ag-based overlay layer that has high seizure resistance even when using Pb is avoided. The overlay layer is relatively soft and has excellent thermal conductivity, allowing for rapid dissipation of frictional heat to the base side. The addition of Al to the overlay layer does not significantly reduce its thermal conductivity, and the layer can function even under severer conditions. The overlay layer can also contain other additive elements such as Sn and Zn, and the thermal conductivity of the layer comes close to that of Al when the proportion of Al exceeds 15% by mass.

Problems solved by technology

Therefore, an overlay layer which comprises Ag as a main component and to which In, Sn, or Bi is added cannot easily dissipate the heat generated in the sliding part with a mating member, to the base side.

As a result, the temperature of an overlay layer of this type easily rises under severer conditions, causing reduction in strength and hardness, which causes a problem of easily resulting in seizure.

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