Closed loop carbon monoxide self-contained nickel carbonyl depos

Details Closed loop carbon monoxide self-contained nickel carbonyl depos Closed loop carbon monoxide self-contained nickel carbonyl depos

1998-11-04

2000-04-11

Meeks, Timothy

Coating processes

Coating by vapor, gas, or smoke

Metal coating

42725523, 427345, C23C 1616

Patent

active

060485787

ABSTRACT:
A closed loop, carbon monoxide self-contained preferably continuous process and apparatus for the production of nickel or nickel coated objects by nickel vapor deposition (NVD), comprising placing an object to be treated with nickel carbonyl in a deposition chamber; feeding a gaseous mixture of nickel carbonyl and carbon monoxide to the chamber; producing the nickel or nickel coated object and a nickel carbonyl-depleted gaseous mixture; removing nickel carbonyl from the nickel carbonyl-depleted gaseous mixture in a primary and subsequent secondary condensation unit and, preferably, a tertiary condensation unit to produce an essentially nickel carbonyl-free gas. The secondary and tertiary condensation units operably freeze out and subsequently thaw nickel carbonyl and most preferably each comprises a pair of units linked in parallel arrangement operative in alternating, alternate freeze-thaw modes. Carbon monoxide-containing gas is recycled to a nickel carbonyl reactor. The process and apparatus provides a more economic to operate, safe and more operably reliable than prior art NVD processes.

REFERENCES:
patent: 3294059 (1966-12-01), Barnes
patent: 3688474 (1972-09-01), Head et al.
patent: 4769054 (1988-09-01), Steigman
patent: 5766683 (1998-06-01), Waibel

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