Method of ion nitriding steel workpieces

Details Method of ion nitriding steel workpieces Method of ion nitriding steel workpieces

1991-09-30

1993-08-31

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148226, 148228, 427569, 427576, 20419216, C23C 838

Patent

active

052405141

ABSTRACT:
In subjecting a steel workpiece to nitriding by glow discharge, formation of brittle nitrogen compound is restrained and the surface hardened layer with a nitrogen diffusion layer of high toughness is obtained by making the gas atmospheric condition the gas mixing ratio of N.sub.2 :H.sub.2 =1:2-40. By mixing Ar gas in the above gas atmospheric condition additionally, glow width is adjusted and glow discharge is allowed to enter into narrow concaves at the surface of a workpiece.

REFERENCES:
patent: 2946708 (1960-07-01), Berghaus et al.
patent: 4212687 (1980-07-01), Tanaka et al.
patent: 4309227 (1982-01-01), Kajikawa et al.
patent: 4394234 (1983-07-01), Asahi et al.
patent: 4969378 (1990-11-01), Lu et al.
Metals Handbook, 9th Ed., vol. 5 pp. 138-149, 417-421; 1982.
Chapman, Brian Glow Discharge Processes; Sputtering and Plasma Etching; 1980 pp. 77-82 115-124 QC 702.7P6; C48.
Metals Handbook 9th Edition, vol. 1, 1978 pp. 540-542, TA472A3.

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