Surface treatment of sintered products

摘要

A porous surface is synthesized in sintered composite material using electron beams or lasers. The technique can be used for producing self lubricating bearing materials. The composite comprises 90 weight percent copper, 8 weight percent tin and 2 weight percent graphite, pressed at pressures up to 590 MPa and sintered 800 DEG C. The surface of the specimen was subjected to electron beam melting using an oscillated beam of focused electrons. Electron beam surface melting not only provide a dense substrate and a surface layer of required porosity, it also promises refined microstructural features of the surface and enhanced chemical uniformity due to rapid solidification of the melted layer.