Fluidized bed method of forming a nitride or carbonitride layer

Details Fluidized bed method of forming a nitride or carbonitride layer Fluidized bed method of forming a nitride or carbonitride layer

1987-11-13

1989-10-03

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148 16, 148 166, C21D 174

Patent

active

048714011

ABSTRACT:
A method of forming a nitride or carbonitride layer on the surface of an iron or iron alloy article, which comprises the steps of: (a) disposing in a fluidized bed furnace a treating agent comprising a refractory powder, a metal powder of at least one selected from the group consisting of chromium, vanadium, titanium and a metal containing at least one of the chromium, vanadium and titanium, and a halide powder; (b) introducing a nitrogen-containing gas into the fluidizied bed furnace; (c) heating the fluidized bed furnace; and (d) disposing the article in the fluidized bed furnace during or after the steps (a) to (c). In this method, the article is preferably treated at a temperature not higher than 650.degree. C. The step (c) may precede the step (b). The halide powder may be supplied to the fluidized bed furnace from outside in the form of green compact or a gas.

REFERENCES:
patent: 3197346 (1965-07-01), Munday
patent: 4481264 (1984-11-01), Faune
Metals Handbook, vol. 4, Heat Treating, pp. 299-306, and vol. 5, Cleaning Finishing & Coating, pp. 542-545, .COPYRGT.1981.

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