Process for producing furnace atmospheres using...

Details Process for producing furnace atmospheres using... Process for producing furnace atmospheres using...

C - Chemistry, Metallurgy

21

D

C21D 1/76 (2006.01) B22F 3/10 (2006.01) B23K 35/38 (2006.01)

Patent

CA 2111498

ABSTRACT A process for producing low-cost furnace atmospheres suitable for annealing and heat treating ferrous and nonferrous metals and alloys, brazing metals and ceramics, sealing glass to metal, and sintering metal and ceramic powders in a continuous furnace equipped with an ammonia dissociator from non-cryogenically produced nitrogen containing from 0.05 to 5.0% residual oxygen is presented. The disclosed process involves mixing non-cryogenically produced nitrogen with a pre-determined amount of a reducing gas such as hydrogen, ammonia, a C, H, and O containing hydro- carbon such as an alcohol, an ether, etc., or a mixture thereof, passing the mixture through an ammonia dissociator and converting the residual oxygen to an acceptable form such as moisture, carbon monoxide, carbon dioxide, or mixture thereof, and using the resultant gaseous mixture for annealing and heat treating ferrous and nonferrous metals and alloys, brazing metals and ceramics, sealing glass to metal, and sintering metal and ceramic powders.

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