METHOD OF HARDENING SURFACE OF METALLIC PART, PISTON, CYLINDER HEAD, AND CYLINDER BLOCK EACH PRODUCED USING THE SURFACE-HARDENING METHOD, AND PROCESS FOR PRODUCING THE SAME

摘要

A method of surface hardening which comprises coating the surface of an engine part with an alloy layer having excellent wearing resistance to improve the life of the part; and a process in which a piston or the like improved in wearing resistance by the method is produced. In the process, a metallic powder, a binder, and a solvent are mixed together, and this mixture is evenly applied to the surface of a metallic base material to form a coating film. The coating film is dried and irradiated with a laser light or electron beams to sinter the coating film and cause diffusion. Thus, an alloy layer is formed on the surface of the metallic base material and this alloy layer is bonded to the metallic base material.