Patent ID: 6723389
Filing Date: 2004-04-20
Classification: C23C

Abstract:
A process for producing a coated cemented carbide which comprises at least the steps of(A) subjecting to at least surface-pretreatments of (1) machining processing of at least part of a surface of a cemented carbide substrate comprising a hard phase containing tungsten carbide, and a binder phase, and (2)(a) effecting an electro-chemical polishing treatment on the surface of the substrate or (2)(b) effecting the electro-chemical polishing treatment and a coating treatment onto at least part of the surface of the substrate with at least one of iron, cobalt and nickel and a compound thereof to form a uniform film, and then, (B) providing at least one hard film, which comprises a single layer or two or more laminated layers, comprising at least one material selected from a carbide, a nitride and an oxide of an element selected from elements of the Groups 4, 5 and 6 of the Periodic Table, aluminum and silicon and a mutual solid solution thereof, on the surface of the resulting substrate.