Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Patent
1991-04-12
1992-07-28
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
148225, C23C 820
Patent
active
051338130
ABSTRACT:
A gas-carburizing process wherein an article is treated by feeding a hydrocarbon gas and an oxidative gas of raw material gases directly into an atmospheric heat treating furnace, characterized in that, when the pressure within the furnace is negative, CO.sub.2 is fed as a negative pressure dissolving or eliminating means.
A gas-carburizing apparatus wherein a gas inlet for feeding a hydrocarbon gas and an oxidative gas provided in the ceiling part of an atmospheric heat treating furnace is provided with a CO.sub.2 feeding part for eliminating the negative pressure within the furnace.
REFERENCES:
patent: 4372790 (1983-02-01), Gohring et al.
patent: 4950334 (1990-08-01), Nishioka et al.
Abukawa Fukitaka
Goi Hitoshi
Kitayama Yoshihiko
Nanba Keishichi
Watanabe Masahiko
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Sheehan John P.
Tokyo Heat Treating Company Ltd.
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