Preparation of an .epsilon.-carbon nitride surface layer on ferr

Details Preparation of an .epsilon.-carbon nitride surface layer on ferr Preparation of an .epsilon.-carbon nitride surface layer on ferr

1974-05-08

1977-01-18

Lovell, C.

Metal treatment

Compositions

Heat treating

148 166, C23C 1112, C23C 1118

Patent

active

040037649

ABSTRACT:
A gas carbon nitriding method to produce .epsilon.-carbon nitride layers on ferrous metal substrates. The gas atmosphere comprises partially dissociated ammonia and contains between about 2 and 20% (by volume) of carbon monoxide and carbon dioxide. The treatment temperature is between 500.degree. and 650.degree. C. The process is characterized in that the average nitriding potential, p.sub.NH.sbsb.3 /p.sub.H.sbsb.2.sup.1.5 , is between 0.5 and 5, and the partial pressure ratio, p.sub.CO /p.sub.CO.sbsb.2, is between about 1 and 10.
The gas atmosphere is formed by introducing into the furnace chamber (a) an ammonia-containing gas, and (b) a combusted gas containing carbon dioxide.

REFERENCES:
patent: 1995314 (1935-03-01), Machlet
patent: 2472320 (1949-06-01), Vennerholm et al.
patent: 3228807 (1966-01-01), Mitchell et al.
patent: 3240636 (1966-03-01), Daubersy
patent: 3399085 (1968-08-01), Knechtel et al.
patent: 3519257 (1970-07-01), Winter et al.
patent: 3748195 (1973-07-01), Kondo et al.
Metal Progress, Nov. 1949, pp. 651-655.

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