Method for low temperature aluminum coating of an article

Details Method for low temperature aluminum coating of an article Method for low temperature aluminum coating of an article

1995-09-29

1998-07-14

Lusignan, Michael

Coating processes

Coating by vapor, gas, or smoke

Metal coating

427252, 4272557, 427124, C23C 1612, C23C 1618

Patent

active

057801061

ABSTRACT:
A method is provided for coating a surface of an article with aluminum at a low temperature no greater than about 600.degree. F. and less than a selected temperature exposure above which adversely can affect article integrity. The method includes providing an aluminizing vapor, for example a vapor of an organo-metallic material, which can decompose to substantially pure Al in a low decomposition temperature range. At least the portion of the surface to be coated is heated to the decomposition temperature range and then exposed to the vapor which decomposes and deposits a layer of Al on the surface portion. The Al then is diffused into the portion at a temperature consistent with other heat treatment of the article and which will not affect adversely properties and conditions previously introduced and desired to be retained in the article. The method is particularly useful in aluminizing a portion of an article surface associated with or near another portion which includes a thermal barrier coating, maintaining the integrity of the thermal barrier coating, such as its bond with a substrate coating.

REFERENCES:
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patent: 5217756 (1993-06-01), Shinzawa
patent: 5238752 (1993-08-01), Duderstadt et al.
patent: 5254413 (1993-10-01), Maricocchi
patent: 5403669 (1995-04-01), Gupta et al.
Pierson, Hugh O. Handbook of Chemical Vapor Deposition (CVD) Principles, Technology and Application, 1992 p. 127.

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