Heat treating atmospheres from non-cryogenically generated nitro

Details Heat treating atmospheres from non-cryogenically generated nitro Heat treating atmospheres from non-cryogenically generated nitro

1992-12-22

1994-04-12

Roy, Upendra

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148206, C21D 100

Patent

active

053022130

ABSTRACT:
An improved process for producing nitrogen-based atmospheres suitable for annealing ferrous metals and alloys, brazing metals, sintering metal and ceramic powders, and sealing glass to metals from non-cryogenically generated nitrogen is presented. These atmospheres are produced by 1) humidifying non-cryogenically generated nitrogen containing less than 5.0 vol. % residual oxygen, 2) mixing it with a specified amount of a hydrocarbon gas, 3) feeding the gaseous mixture into the heating zone of a furnace through a diffuser, and 4) converting in-situ the residual oxygen and moisture present in it to a mixture of carbon dioxide, carbon monoxide, moisture, and/or hydrogen. The key features of the present invention include a) humidifying the feed gas prior to introducing it into the heating zone of a furnace operated above about 800.degree. C. and b) using enough amount of a hydrocarbon gas to facilitate in-situ conversion of residual oxygen and moisture present in the feed gas to a mixture of carbon dioxide, carbon monoxide, moisture, and hydrogen in the heating zone of a furnace.

REFERENCES:
patent: 5207839 (1993-05-01), Claverie et al.

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