Patent ID: 6589602
Filing Date: 2003-07-08
Classification: B22F,C22C,C23C,Y10T

Abstract:
A method for producing a surface-coated cemented carbide which comprises a cemented carbide base material comprising hard phase particles containing tungsten carbide as a main component and at least one material selected from the group consisting of a carbide, a nitride and a carbonitride of a metal selected from metals of the Groups 4, 5 and 6 of the Periodic Table and a solid solution of the above-mentioned compounds and a binder phase comprising an iron group metal as a main component and a hard film formed on a surface of the base material comprising at least one layer, each of the layers comprises 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 solid solution of the above-mentioned compounds,wherein the method comprises the steps of uniformly coating at least part of the surface of the base material with a metal, an alloy or a compound comprising at least one diffusive element selected from an iron group metal, chromium, molybdenum, manganese, copper and silicon, and then, coating the surface with the hard film component; and the binder phase contains the at least one diffusive element, and a content of the at least one diffusive element in the cemented carbide base material is higher at a proximate portion of the interface with the hard film than inside of the base material.