Metal treatment – Compositions – Heat treating
Patent
1984-08-27
1985-09-03
O'Keefe, Veronica
Metal treatment
Compositions
Heat treating
148 30, 148 27, 148 6, 75253, C21D 106
Patent
active
045390533
ABSTRACT:
A pack composition is disclosed for case hardening a ferrous metal to initially diffuse boron into the surface thereof and subsequently diffuse boron and silicon into the surface thereof. The pack composition comprises an amorphous boron, a silicon material, an alkyli earth, and a carbon bearing compound with the last named compound including a barium carbonate, a calcium carbonate and a hardwood charcoal and coke mixture.
REFERENCES:
patent: 520056 (1894-05-01), Hutchinson
patent: 788778 (1905-05-01), Lamaryese
patent: 3806374 (1974-04-01), Krzyminski et al.
patent: 3891474 (1975-06-01), Grange
Dresser Industries Inc.
O'Keefe Veronica
Winans Fred A.
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