Patent ID: 6811580
Filing Date: 2004-11-02
Classification: C04B,C23C,Y10T

Abstract:
A cutting tool for the machining of grey cast iron comprising:a CBN-substrate comprising more than 60 vol % CBN; and a CVD coating deposited at 1000Â° C. or higher comprising at least one layer of metal nitride, carbonitride or carbide with the metal elements selected from the group consisting of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, W and Al and at least one layer of &agr; and/or &kgr;-Al2O3, and wherein a total thickness of the at least one layer of metal nitride, carbonitride or carbide is 2-7 &mgr;m and a total thickness of the at least one layer of &agr;- and/or &kgr;-Al2O3 is 2-8 &mgr;m.