发明授权
- 专利标题: Heat treating atmospheres from non-cryogenically generated nitrogen
- 专利标题(中): 来自非低温生成氮的热处理气氛
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申请号: US995623申请日: 1992-12-22
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公开(公告)号: US5302213A公开(公告)日: 1994-04-12
- 发明人: Brian B. Bonner , Diwakar Garg
- 申请人: Brian B. Bonner , Diwakar Garg
- 申请人地址: PA Allentown
- 专利权人: Air Products and Chemicals, Inc.
- 当前专利权人: Air Products and Chemicals, Inc.
- 当前专利权人地址: PA Allentown
- 主分类号: B23K35/38
- IPC分类号: B23K35/38 ; C21D1/76 ; C21D1/00
摘要:
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.