| 摘要 |
PURPOSE:To maintain lubricity and wear resistance by forming pores among particles in a porous sintered layer formed by sintering Cu power particles and meanwhile covering particle surfaces with copper-covered graphite, and impregnating a part of a bearing layer is pores. CONSTITUTION:Particles 2a, of such as Cu, are dispersed and sintered on a steel back sheet 1, and pores are formed among the particles 2a to form a porous layer 2. The surfaces of the particles 2a of such as Cu, are covered with graphite 2b covered with Cu. The copper-covered graphite 2b is formed in such a way that a graphite surface is covered in thickness of approximately three micron with Cu, etc., through, for example, a replacement plating method, and the copper-covered graphite 2b is integrally combined with the surface of the particle 2a through a covering layer. Since the copper-covered graphite is firmly combined with copper powder particles by means of surface-covering copper, graphite is uniformly dispersed, enough strength is provided, and there is no trouble on slide for a long period. Even when a bearing layer on a surface is worn and dissipated and the porous layer is exposed, lubricity is held and rapid lowering of wear resistance can be prevented. |
