Method of heat treating NICRALY alloys for use as ceramic kiln a

Details Method of heat treating NICRALY alloys for use as ceramic kiln a Method of heat treating NICRALY alloys for use as ceramic kiln a

1982-02-02

1984-03-27

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 115A, 148 63, C22F 100

Patent

active

044392486

ABSTRACT:
This invention relates to components of ceramic kiln and furnace hardware made of NICRALY alloys.
Disclosed is a method of heat treating NICRALY alloys to obtain a uniform film of desired alumina (Al.sub.2 O.sub.3) on the surface of the alloys. The gist of the invention resides in the control of the critical relationship between the temperature and the partial pressure of oxygen in the oxygen potential controlled atmosphere during the heat treatment. Optimum results are obtained when the temperature is about 2100.degree. F. and the dew point is about -30.degree. F. in hydrogen for about one hour.

REFERENCES:
patent: 4312682 (1982-01-01), Herchenroeder

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