Method and apparatus for controlling the atmosphere in heat trea

Details Method and apparatus for controlling the atmosphere in heat trea Method and apparatus for controlling the atmosphere in heat trea

1998-02-16

2000-04-18

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148216, 148235, 266251, 266252, C23C 820, C23C 822

Patent

active

060510781

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, and the supply of the hydrocarbon series gas is stopped either when the quantity of a residual CH.sub.4 in the furnace is changed to increasing from decreasing, or when a partial pressure of oxygen in the furnace reaches a predetermined value.

REFERENCES:
patent: 2886478 (1959-05-01), Beard

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