C - Chemistry – Metallurgy – 22 – F
Patent
C - Chemistry, Metallurgy
22
F
148/23
C22F 1/10 (2006.01) C23C 8/10 (2006.01) F27D 1/00 (2006.01)
Patent
CA 1196554
METHOD OF HEAT TREATING NICRALY ALLOYS FOR USE AS CERAMIC KILN AND FURNACE HARDWARE 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 (Al2O3) on the surface of the alloys. The gist of the invention resides in the control of the critical relationship between the tempera- ture 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°F (1150°C) and the dew point is about -30°F (-34°C) in hydrogen for about one hour.
418782
Herchenroeder Robert B.
Lai George Y.
Cabot Corporation
Marcoux & Sher Swabey Mitchell Houle
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