Coating processes – Coating by vapor – gas – or smoke – Plural coatings applied by vapor – gas – or smoke
Patent
1997-07-29
2000-04-25
Beck, Shrive
Coating processes
Coating by vapor, gas, or smoke
Plural coatings applied by vapor, gas, or smoke
4272481, 4274193, 427596, C23C 1600, C23C 1430
Patent
active
060541849
ABSTRACT:
A method and apparatus for forming a multilayer thermal barrier coating such that the coating is composed of substantially homogeneous layers of different ceramic materials. The method entails supporting an article within a coating apparatus and in proximity to ceramic ingots of the different ceramic materials, and then simultaneously directing electron beams at both ingots so as to maintain a portion of each ingot in a molten state. According to a particular aspect of this invention, vapors of both ceramic materials coexist within the coating apparatus, yet each ceramic material is sequentially deposited onto the article by sequentially interrupting exposure of surfaces of the article to the vapors, such that the vapors form homogeneous successive layers on the surface. Exposure of the article to one or more of the vapors can be interrupted with a baffle, such that the vapor of only one of the ceramic ingots is directly deposited on a given surface of the article at any instant. The baffle can be employed in conjunction with the article being rotated at a constant or variable speed, and/or being translated above the members within the vessel to alter the relative thicknesses of the ceramic and an intermediate layer that is formed between adjacent layers and is composed of a mixture of the ceramic materials.
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Bruce Robert W.
Lindblad Norman R.
Rosenzweig Mark A.
Schaeffer Jon C.
Wortman David J.
Beck Shrive
Chen Bret
General Electric Company
Hess Andrew C.
Narciso David L.
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