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Method of making an apparatus for transpiration cooling of substrates such as turbine airfoils

United States Patent

9,579,722
February 28, 2017
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
A method and apparatus for generating transpiration cooling using an oxidized porous HTA layer metallurgically bonded to a substrate having micro-channel architectures. The method and apparatus generates a porous HTA layer by spreading generally spherical HTA powder particles on a substrate, partially sintering under O.sub.2 vacuum until the porous HTA layer exhibits a porosity between 20% and 50% and a neck size ratio between 0.1 and 0.5, followed by a controlled oxidation generating an oxidation layer of alumina, chromia, or silica at a thickness of about 20 to about 500 nm. In particular embodiments, the oxidized porous HTA layer and the substrate comprise Ni as a majority element. In other embodiments, the oxidized porous HTA layer and the substrate further comprise Al, and in additional embodiments, the oxidized porous HTA layer and the substrate comprise .gamma.-Ni+.gamma.'-Ni.sub.3Al.
Alvin; Mary Anne (Pittsburgh, PA), Anderson; Iver (Ames, IA), Heidlof; Andy (West Des Moines, IA), White; Emma (Ames, IA), McMordie; Bruce (Perkasie, PA)
U.S. Department of Energy (Washington, DC)
14/ 596,307
January 14, 2015
GOVERNMENT INTERESTS The United States Government has rights in this invention pursuant to the employer-employee relationship of the Government to the inventors as U.S. Department of Energy employees and site-support contractors at the National Energy Technology Laboratory, and pursuant to DOE Contract No. DE-AC02-07CH11358 with Ames Laboratory.