Method of vacuum carburizing

Details Method of vacuum carburizing Method of vacuum carburizing

1975-03-26

1979-01-16

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

148 203, C23C 1110

Patent

active

RE0298816

ABSTRACT:
A method and apparatus of vacuum carburizing by changing the surface chemistry of a metal article through absorption and thermal diffusion of carbon, wherein oxidizing gases and other impurities are initially removed from the chamber in which the metal article is treated by evacuation and the temperature in the chamber is maintained at a level above normal carburizing temperatures, but at a point that is compatible with the physical characteristics of the chamber and the article; whereafter a source of carbon is introduced into the evacuated chamber in accordance with a preselected cycle and at a concentration that is controlled by the absolute pressure of the carbon in the chamber, so that the carbon is absorbed and diffused into the metal article at a controlled rate.

REFERENCES:
patent: 1768317 (1930-06-01), Guthrie et al.
patent: 2565360 (1951-08-01), Dufilho
patent: 3168607 (1965-02-01), Greene
patent: 3202553 (1965-08-01), Greene
patent: 3519257 (1970-07-01), Winter et al.
patent: 3620518 (1971-11-01), Winter et al.

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