Method and apparatus for thermochemical treatment

Details Method and apparatus for thermochemical treatment Method and apparatus for thermochemical treatment

1987-10-16

1990-02-13

McDowell, Robert

Metal treatment

Compositions

Heat treating

148 165, 204164, 266251, C21D 106

Patent

active

049003712

ABSTRACT:
Known techniques of plasma case hardening of workpieces may fail to provide sufficient treatment to re-entrant portions, such as fine holes, in the workpiece. This specification discloses a technique of pulsed plasma treatment in which the duration of the plasma pulses and the intervals between them are selected to allow a substantially even distribution of the gas which forms the plasma over all the surface to be treated of the workpiece.

REFERENCES:
patent: 3228809 (1966-01-01), Berghaus et al.
patent: 4181541 (1980-01-01), LeFrancois
patent: 4490190 (1984-12-01), Speri
patent: 4645981 (1987-02-01), Stramke
Patent Abstracts of Japan, vol. 4, No. 65 (C-10) (547), May 16, 1980; JP-A-55 31 139 (Nippon Denshi Kogyo K.K.) 05-03-1980.
Harterei-Technische Mitteilungen, vol. 37, No. 6, Nov.-Dec. 1982, pp. 263-269, Carl Hanser Verlag, Munchen, DE; H. Wilhelmi et al.: "Nitrieren mit gepulster Glimmentladung."
ZWF Zwitschrift Fur Wirtschaftliche Fertigung, vol. 78, No. 12, Dec. 1983, pp. 541-592, Carl Hanser Verlag, Munchen, DE; S. Stramke et al.: "Eltropuls-Plasmanitrieren, ein neues Verfahren der Warmebehandlungstechnik."

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