Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1994-09-07
1996-11-19
Turner, Archene
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
51307, 51309, 428336, 428472, 428697, 428698, 428699, 428701, 428702, C23C 900
Patent
active
055760937
ABSTRACT:
The present invention concerns a tungsten carbide base cutting tools formed on sintered hard alloy substrate material. Multiple hard coatings are deposited on the Co-enriched surface layers of the substrate material, and a maximum value of the Co concentration in a layer occurs within a distance of 50 .mu.m of the external surface of the substrate material, and this surface layer region is referred to as the denuded zone because the surface region is substantially free of carbides, carbonitrides and nitrides of Ti, Ta, and Nb containing W. The multilayer coating consists of a primary coating of TiCN, a secondary coating of Al.sub.2 O.sub.3 and the surface coating consisting of at least one of TiCN and TiN. The interface between the substrate material and the primary coating is provided with a first intermediate coating consisting of TiN. The interface between the primary coating and the secondary coating is provided with a second intermediate coating consisting of at least one layer of TiC, TiCO and TiCNO.
REFERENCES:
patent: 4714660 (1987-12-01), Gates, Jr.
patent: 4746563 (1988-05-01), Nakano et al.
patent: 4984940 (1991-01-01), Bryant et al.
patent: 5250367 (1993-10-01), Santhanam et al.
Osada Akira
Sudo Toshikatsu
Tanaka Tetsuya
Yoshimura Hironori
Mitsubishi Materials Corporation
Turner Archene
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