Process for producing cermet cutting tools having both longitudi

Details Process for producing cermet cutting tools having both longitudi Process for producing cermet cutting tools having both longitudi

1995-03-21

1996-12-31

Beck, Shrive

Coating processes

Coating by vapor, gas, or smoke

427249, 427255, 4272552, 4272557, 117 88, 117 89, C23C 1630

Patent

active

055892230

ABSTRACT:
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, and a further layer comprises a granular crystal structure. In the method of fabrication, 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.

REFERENCES:
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patent: 5935057 (1990-06-01), Yoshimura et al.
Kubel, E., "New CVD-coatings for carbide inserts", Adv. Hard Mater. Prod., Conf. Proc. (1988) pp. 27/1-27/9.
Bonetti-Lang, M. et al., "Carbonitride coatings at moderate temperature obtained from organic carbon
itrogen compounds", Int. J. Refract. Hard Met. (1982), 1(4), pp. 161-165. (no months availabe).

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