Process of making surface alloyed parts

Details Process of making surface alloyed parts Process of making surface alloyed parts

1981-06-08

1983-02-08

Lawrence, Evan K.

Coating processes

With pretreatment of the base

Shielding or spacing

427431, 427432, C23C 108, C23C 110

Patent

active

043729959

ABSTRACT:
Predetermined diffusing elements such as chromium and/or aluminum are diffused into the surface of a ferrous-based part while preventing, or at least minimizing, bonding of portions of such part to each other or to a fixture with which the part is processed, by constructing the fixture of a barrier material or placing a barrier layer between the member and the part. The barrier has a composition to substantially preclude diffusion therein of the predetermined element and that is capable of withstanding a molten-lead alloy bath. Then the part is contacted by a molten alloy bath consisting essentially of lead and the diffusing elements. Thereafter, the part is separated from the member. The process finds particular use when the part is coiled sheet steel, in which case adjacent flights of coil are spaced by separator means which is made of a barrier material or carries a barrier layer.

REFERENCES:
patent: 1312716 (1919-08-01), Wise
patent: 3097959 (1963-07-01), Zachman
patent: 3620816 (1971-11-01), Rausch
patent: 3778299 (1973-12-01), Rausch et al.

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