Nitriding-oxidizing treatment method for metal

Details Nitriding-oxidizing treatment method for metal Nitriding-oxidizing treatment method for metal

2011-03-01

2011-03-01

King, Roy (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

Reexamination Certificate

active

07896980

ABSTRACT:
The present nitriding-oxidizing method for a metal member is imposed, which includes providing a powdery nitriding agent comprised of a powdery nitride compound and inorganic powder, wherein the powdery nitride compound decomposes below a nitriding-oxidizing temperature to generate nitriding gas, and the inorganic powder does not react; embedding an essential part of the metal member to be nitrided and oxidized into the powdery nitriding agent, and then performing nitridization-oxidization while an oxygen-containing gas is always present in the powdery nitriding agent; and, if necessary, allowing the metal member after nitridization-oxidization to carry out a reoxidization in an oxygen-containing atmosphere. The method of the present invention has a broader temperature range for nitridization-oxidization.

REFERENCES:
patent: 4786526 (1988-11-01), Arai et al.

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