Environmental coating for nickel aluminide components and a meth

Details Environmental coating for nickel aluminide components and a meth Environmental coating for nickel aluminide components and a meth

1997-03-31

1998-11-17

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having composition, density, or hardness gradient

428629, 428680, 148277, 148537, 416241R, B32B 1504, F01D 528, C23C 1028, C23C 1060

Patent

active

058373853

ABSTRACT:
An environmental coating and a method for forming the coating on a nickel aluminide component designed for use in a hostile thermal environment, such as turbine, combustor and augmentor components of a gas turbine engine. The environmental coating includes a metal that has been diffused into the surface of the nickel aluminide component, and an aluminum oxide layer on the surface of the nickel aluminide component. According to this invention, the metal is one or more noble metals, chromium and/or an MCr alloy, and forms a diffusion region comprising noble metal-aluminides and/or chromium-aluminides. The environmental coating optionally contains up to about 1.0 atomic percent of at least one oxygen-active element, such as yttrium, hafnium, zirconium and/or cerium. According to the invention, the environmental coating need only consist of the diffusion region and the aluminum oxide layer, and therefore does not require additional environmentally-resistant layers (e.g., diffusion aluminides or MCrAlY coatings) to protect the underlying nickel aluminide substrate.

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patent: 5302465 (1994-04-01), Miller et al.
patent: 5413871 (1995-05-01), Nelson et al.
patent: 5500252 (1996-03-01), Meelu
patent: 5514482 (1996-05-01), Strangman
patent: 5650235 (1997-07-01), McMordie et al.

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