Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1994-09-07
1997-10-28
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, 407119, C23C 900
Patent
active
056816510
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 layer of the substrate material, and Co-enriched surface layer occurs within a surface layer region that is 50 .mu.m from an interface of said substrate material, wherein the Co content in said surface layer that is 5-10 .mu.m from an interface of said substrate material is within a range from 15-25% by weight; wherein the Co content in said surface layer is more than the Co content in the core, and wherein the content of the carbides of Ti, Ta and Nb is lower than that in the core. 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 or 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.
Okada Yoshikazu
Tanaka Tetsuya
Yoshimura Hironori
Mitsubishi Materials Corporation
Turner Archene
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