Patent ID: 6737178
Filing Date: 2004-05-18
Classification: C04B,C23C,Y10T

Abstract:
A coated PCBN cutting tool, comprising a substrate and a hard coated layer on said substrate(a) said substrate containing not less than 35 volume % and not more than 85 volume % of CBN; (b) said hard coated layer comprising at least one compound layer consisting of at least one element selected from a group consisting of the group 4a, 5a, and 6a elements of the periodic table and Al, and at least one element selected from a group consisting of C, N and O, and inevitable impurities; (c) a thickness of said hard coated layer being not less than 0.3 &mgr;m and not more than 10 &mgr;m; and (d) a center-line mean roughness Ra of said hard coated layer being not more than 0.2 &mgr;m.