Tool produced by a plasma-activated CVD process

Details Tool produced by a plasma-activated CVD process Tool produced by a plasma-activated CVD process

1991-11-21

1993-06-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

51295, 51307, 51309, 407119, 428472, 428697, 428698, 428699, C23C 2804, B32B 2700

Patent

active

052233375

ABSTRACT:
A tool having an extended service lift and including a hard metal body, and at least one surface layer composed of at least one hard substance selected from the group consisting of carbides, nitrides, and carbonitrides of titanium and zirconium, and having a chlorine content ranging from a finite amount up to 4 mass percent, the tool being produced by plasma-activated CVD process including: a. positioning the hard metal body in a CVD chamber having means for supplying direct voltage thereto, the hard metal body being connected to the direct voltage supplying means as a cathode thereof, b. introducing into the CVD chamber a reactive gas mixture including a nitrogen-containing substance, a carbon-containing substance, and at least one compound containing at least one of titanium and zirconium, and c. exciting plasma formation at the hard metal body and coating same by chemical vapor deposition by applying a pulsed direct voltage and a residual direct voltage thereto, the residual direct voltage having a magnitude which is at least equal to the lowest ionization potential of any gas in the reactive gas mixture but does not exceed 50% of the maximum value of the pulsed direct voltage.

REFERENCES:
patent: 4500563 (1985-02-01), Ellenberger et al.
patent: 4675206 (1987-06-01), Ikegaya et al.
patent: 4708037 (1987-11-01), Buljar et al.
patent: 4720437 (1988-01-01), Chudo et al.
patent: 4758451 (1988-07-01), van den Berg et al.
patent: 4915977 (1990-04-01), Okamoto et al.
Schedler "Hartmetall fur den Praktiker", VDI-Verlag GmbH pp. 492-494 (1988).
van der Straten, P. J. M. et al. "Aufbringen verschleissfester Schichten auf Werkzeugstahl nach dem CVD-Verfahren", VDI-Z, vol. 124, No. 18, Sep. 1982 pp. 693-698.
Munster "Eigenschaften und Anwendungen von Titannitrid und Titancarbid", Angewandte Chemie, vol. 69, No. 9, pp. 281-312 (May 1957).

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