Cermet cutting tool and process for producing the same

Details Cermet cutting tool and process for producing the same Cermet cutting tool and process for producing the same

1993-06-08

1995-07-25

Turner, Archene

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

51307, 51309, 428216, 428698, 428701, 428702, 428472, 428469, B23P 1528, C23C 1630

Patent

active

054360714

ABSTRACT:
The present invention discloses a cermet cutting tool, and process for producing the same, comprising a substrate formed from titanium carbo-nitride based cermet, and a hard coating layer of average thickness 0.5.about.20 .mu.m, formed onto the surface of the cermet substrate comprising a lower layer formed from at least one layer of a compound selected from the group consisting of titanium carbide (TiC), titanium nitride (TIN), titanium carbo-nitride (TiCN), titanium carbo-oxide (TiCO) and titanium carbo-oxi-nitride (TiCNO), and aluminum oxide (Al.sub.2 O.sub.3). Additionally, at least one of the layers comprising the hard coating layer is a titanium carbo-nitride layer, and at least one layer of this titanium carbo-nitride layer comprises a longitudinal growth crystal structure. The process for producing a cermet cutting tool according to the present invention comprises a step for preparing a substrate from titanium carbo-nitride based cermet, and a step for forming a hard coating layer onto the surface of said substrate using a chemical vapor deposition method wherein in at least one part of this step, chemical vapor deposition is performed using a reaction gas composed of 1.about.5% of TiCl.sub.4, 0.1.about.1% of CH.sub.3 CN, 0.about.25% of N.sub.2 with the remaining portion being composed of H.sub.2, under a reaction temperature of 800.degree..about.900.degree. C. and a reaction pressure of 30.about.200 Torr.

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