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

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.
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Issue Date:
OSTI Identifier:
U.S. Department of Energy AMES
Patent Number(s):
Application Number:
Contract Number:
Resource Relation:
Patent File Date: 2015 Jan 14
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
Country of Publication:
United States

Other works cited in this record:

Porous metallic material and method
patent, September 1962

Porous wall turbine blades and method of manufacture
patent, December 1962

Variable permeability and oxidation-resistant airfoil
patent, March 1972

Transpiration cooled turbine blade with metered coolant flow
patent, December 1972

Transpiration cooled ceramic blade for a gas turbin
patent, January 1982

Method of manufacturing a transpiration cooled ceramic blade for a gas turbin
patent, March 1983

Turbine blade having transpiration strip cooling and method of manufacture
patent, November 1997

Transpiration cooling in thermal barrier coating
patent, April 2002

Multi-layer thermal barrier coating with transpiration cooling
patent, January 2003

Enhancement of thermal stability of porous bodies comprised of stainless steel or an alloy
patent, November 2010

Analytical treatment of the role of surface oxide layers in the sintering of metals
journal, November 1979
  • Munir, Z. A.
  • Journal of Materials Science, Vol. 14, Issue 11, p. 2733-2740
  • DOI: 10.1007/BF00610647

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