Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1995-04-06
1996-09-17
Zimmerman, John
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428655, 428678, 427528, 427531, B32B 1500, B32B 1518, C23C 1448
Patent
active
055567134
ABSTRACT:
The present invention provides a method for forming a diffusion barrier at one or more surfaces of a protective coating. In a preferred embodiment, the protective coating is an MCrAlY coating, and the diffusion barrier is a submicron layer of rhenium atoms. The rhenium diffusion barrier is formed by condensing vaporized rhenium onto the surface of the component and substantially simultaneously bombarding the surface with an energetic beam of inert ions. The high, localized concentration of rhenium atoms at the surface(s) of the protective coating dramatically slows the diffusion of constituent elements from the coating.
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Southwest Research Institute
Zimmerman John
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