Process for producing furnace atmospheres by deoxygenating...

Details Process for producing furnace atmospheres by deoxygenating... Process for producing furnace atmospheres by deoxygenating...

C - Chemistry, Metallurgy

21

D

C21D 1/76 (2006.01) B22F 3/10 (2006.01) B23K 35/38 (2006.01) C01B 3/04 (2006.01) C22F 1/02 (2006.01)

Patent

CA 2111627

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 metals, and sintering non-ferrous metal and ceramic powders from non-cryogenically produced nitrogen containing from 0.05 to 5.0% residual oxygen is presented. The disclosed process involves 1) mixing non-cryogenically produced nitrogen with a pre-determined amount of dissociated ammonia, 2) passing the mixture through a low-pressure drop catalytic reactor, 3) converting the residual oxygen to an acceptable form such as moisture and reducing the residual oxygen level to below about 10 ppm, and 4) using the resultant gaseous mixture for annealing and heat treating ferrous and nonferrous metals and alloys, brazing metals and ceramics, sealing glass to metals, and sintering non-ferrous metal and ceramic powders. The key feature of the disclosed process involves the use of a novel low-pressure drop catalytic reactor for converting residual oxygen with dissociated ammonia to moisture.

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