Method and apparatus for controlling the atmosphere in a heat tr

Details Method and apparatus for controlling the atmosphere in a heat tr Method and apparatus for controlling the atmosphere in a heat tr

1998-02-17

2000-08-22

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148216, 148235, 266251, 266252, C23C 822, C21D 106

Patent

active

061066362

ABSTRACT:
In a method of and apparatus for controlling an atmosphere in a heat treatment furnace according to the present invention, a carburizing is carried out while supplying a hydrocarbon series gas and an oxidization gas into the furnace. The quantity of a residual CH.sub.4, a partial pressure of the oxidization gas and a partial pressure of CO are measured. The quantity of each gas to be supplied into the furnace is controlled according to either one of the values of the partial pressures.

REFERENCES:
patent: 4372790 (1983-02-01), Gohring et al.
patent: 4950334 (1990-08-01), Nishioka et al.

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