Method of surface hardening ferrous workpieces

Details Method of surface hardening ferrous workpieces Method of surface hardening ferrous workpieces

1985-10-10

1989-02-21

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148 166, C21D 174

Patent

active

048061751

ABSTRACT:
Ferrous workpieces are surface-hardened in two stages the first of which involves confinement in a boron-containing pulverulent or pasty treating medium and heating to a temperature at which the workpiece develops a surface layer of iron boride. The thus treated workpiece is thereupon inserted into a vacuum furnace onto a cathode and is heated to a temperature of between 600.degree.and 950.degree. C. After heating up of the workpiece, the furnace receives a stream of nitrogen-containing gas while the heated workpiece is maintained in the plasma that develops as a result of glow discharge between the cathode and an anode so that the workpiece is nitrided. If the workpiece is to be carburized in lieu of nitriding, the temperature in the vacuum furnace can be raised to 1050.degree. C. and the nitrogen-containing gas is replaced with methane or another suitable gaseous fluid.

REFERENCES:
patent: 3809583 (1974-05-01), Krzyminski
patent: 4011107 (1977-03-01), Hayes
patent: 4126488 (1978-11-01), Kunst et al.
patent: 4394234 (1983-07-01), Asahi

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