Method for controlling a nitriding furnace

Details Method for controlling a nitriding furnace Method for controlling a nitriding furnace

1998-06-24

2000-02-15

Langel, Wayne

Compositions

Gaseous compositions

Nitrogen and hydrogen containing

148206, C01B 304, C23C 824

Patent

active

060248939

ABSTRACT:
Dissociated ammonia carrier gas used as a reference gas is obtained from an ammonia dissociator which also provides dissociated ammonia carrier gas to a nitriding furnace whereby the source of ammonia supply gas is the same. An oxygen probe is used to regulate the nitriding potential of a nitriding furnace and atmosphere for process control and high quality nitrided parts. The method further includes correlating the probe mV output signal to a nitriding potential and adjusting the ratio of ammonia supply gas to dissociated ammonia carrier gas at the inlet of the nitriding furnace.

REFERENCES:
patent: 5320818 (1994-06-01), Garg et al.
patent: 5322676 (1994-06-01), Epting
patent: 5348592 (1994-09-01), Garg et al.
patent: 5695731 (1997-12-01), Domergue et al.
Article: Oxygen Probes For Controlling Nitriding and Nitrocarburising Atmospheres by H.J. Spies, H.J. Berg, and H. Zimdars Sep. 16, 1993.
Final Programme and Book of Abstracts: 10th Congress of the International Federation for Heat Treatment & Surface Engineering Sep. 1-5, 1996.

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