Stock material or miscellaneous articles – Composite – Of metal
Patent
1998-03-24
1999-08-24
Speer, Timothy M.
Stock material or miscellaneous articles
Composite
Of metal
428472, 428699, 428701, 428702, B32B 1500
Patent
active
059423340
ABSTRACT:
A method for forming a multilayer thermal barrier coating by physical vapor deposition such that the individual layers of the coating are substantially homogeneous. As a result, a distinct compositional interface is formed between adjacent layers when different ceramic materials are employed to form alternating layers of the coating. Preferably, different ceramic materials characterized by differing thermal conductivities and resistance to erosion are employed, such that both the wear and adhesion characteristics of the coating are promoted. The method entails supporting an article in proximity to ceramic ingots of the preferred ceramic materials, and then sequentially deflecting an electron beam at the ingots so as to melt a portion of each ingot and produce a vapor of each ceramic material that deposits onto the article. According to a particular aspect of this invention, the electron beam is deflected between the members so as to establish a minimum duration during which vapor is not produced from any of the ingots.
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General Electric Company
Hess Andrew C.
Narciso David L.
Speer Timothy M.
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