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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.
Inventors:
; ; ; ;
Issue Date:
OSTI Identifier:
1345391
Assignee:
U.S. Department of Energy AMES
Patent Number(s):
9,579,722
Application Number:
14/596,307
Contract Number:
AC02-07CH11358
Resource Relation:
Patent File Date: 2015 Jan 14
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE

Works referenced in this record:

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