Method for applying diffusion aluminide coating
AssigneeUnited Technologies Corporation
InventorsKenneth S. Murphy, Robert E. Hendricks, Richard J. Fenton
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Abstract
Sputtering techniques are utilized to form an aluminum rich diffusion coating on the surface of a superalloy substrate. The coating contains additions of oxygen active elements, such as yttrium, and the coating has an outward diffusion aluminide microstructure obtained by carrying the sputtering process out at temperatures in the range of about 1,010.degree.-1,150.degree. C.
Claims8
A process for forming an oxidation resistant diffusion aluminide coating on a superalloy substrate, comprising the steps of simultaneously sputtering aluminum and an oxygen active element onto the substrate at conditions to diffuse aluminum and the oxygen active element into the substrate to form an outward diffusion aluminide coating microstructure characterized by an outer coating zone and and an inner coating zone, wherein the outer coating zone contains approximately 15-30 percent aluminum and 0.01-2.0 percent oxygen active element.
A process for forming an oxidation resistant diffusion aluminide coating on a superalloy substrate, comprising the steps of sputtering aluminum and an oxygen active element onto the substrate at conditions to form an outward diffusion aluminide coating microstructure characterized by an outer coating zone containing beta-NiAl, approximately 15-30 weight percent aluminum and 0.01-2.0 weight percent oxygen active element and an inner coating zone having a beta matrix and refractory metal precipitates, where the combined thickness of the outer and inner coating zones is about 100 microns or less.
Dependencies are inferred from the claim text.