Method of carbon nitriding a metal workpiece

Details Method of carbon nitriding a metal workpiece Method of carbon nitriding a metal workpiece

1979-01-02

1980-03-18

Rutledge, L. DeWayne

Metal treatment

Compositions

Heat treating

148 165, C21D 138

Patent

active

041938259

ABSTRACT:
In an ion nitriding method, a mixture of CO or CO.sub.2 and nitrogen is compressed and then admitted into an evacuated discharge furnace. The furnace is heated to 400.degree. C. to 600.degree. C. for two hours for carbonitriding a workpiece. Depending upon the type of the workpiece, up to 30 volume percent of hydrogen is admixed with the mixture.

REFERENCES:
patent: 3035205 (1962-05-01), Berghaus et al.
patent: 3190772 (1965-06-01), Berghaus et al.
patent: 3730863 (1973-05-01), Keller
patent: 4049472 (1977-09-01), Arndt
Metals Handbook, 8th ed., vol. 2, pp. 424-474.
"Low Temperature Gas Carbonitriding Method," Tugio Yonemura; Deuki Seiko, vol. 46, No. 4, 1975, Nov., pp. 227-232.
"Analysis and Conditions of Treatment of Compound Layers," Takao Takarei; Kinzohu Zairyo, vol. 17, No. 5, pp. 133-139.

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