Patent ID: 6756110
Filing Date: 2004-06-29
Classification: C23C,Y10T

Abstract:
A cutting tool comprising:a cemented carbide main body comprising a hard phase which comprises WC and at least two other compounds selected from the group consisting of carbides, nitrides and carbonitrides, wherein at least one compound contains Zr, wherein at least one compound contains a metal other than Zr of the groups 4, 5and 6a in the Periodic Table, and a binder phase comprising at least one metal of the iron group; and a coating layer formed on the surface of the cemented carbide main body, the cemented carbide main body having, in the surface portion, a region where a reduction ratio of Zr to the inside of the cemented carbide main body is smaller than a reduction ratio of the other non Zr group 4a, 5a, and 6a metals from the compounds selected from the group consisting of carbides, nitrides and carbonitrides.