Process and apparatus for the simultaneous deposition of a prote

Details Process and apparatus for the simultaneous deposition of a prote Process and apparatus for the simultaneous deposition of a prote

1989-06-29

1991-11-26

Beck, Shrive

Coating processes

Interior of hollow article coating

Coating by vapor, gas, mist, or smoke

427250, 427252, 427253, 427405, C23C 1622, C23C 1646, C23C 1048, C23C 1034

Patent

active

050681273

ABSTRACT:
In a process for the simultaneous deposition of a protective coating, e.g. an aluminium based coating, on internal and external surfaces of heat-resistant alloy parts, the parts are placed in a box containing a donor material, preferably in the form of granules, comprising the metal to be deposited, and an activator separate from the donor and comprising at least an anhydrous powder of chromium fluoride CrF.sub.3 to provide a source of fluorine. The box is heated to a temperature above 1000.degree. C. and a controlled flow of a carrier gas, reducing or neutral, is introduced into the box so as to establish a circulation of gases in the box whereby fluorinated vapors from thermal decomposition of the CrF.sub.3 activator contact the donor to form a volatile fluoride of the metal to be deposited, and the volatile vapor is carried into contact with the external and internal surfaces of the parts to be coated to deposit the coating thereon.

REFERENCES:
patent: 2801187 (1957-07-01), Galmiche
patent: 2816048 (1957-12-01), Galmich
patent: 2887407 (1959-05-01), Koch
patent: 3096205 (1963-07-01), De Guisto
patent: 3961910 (1976-06-01), Baladjanian et al.
patent: 4132816 (1979-01-01), Benden et al.
patent: 4148275 (1979-04-01), Benden et al.
patent: 4156042 (1979-05-01), Hayman et al.
patent: 4347267 (1982-08-01), Baldi

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