Journal of Thermal Spray Technology

, Volume 9, Issue 1, pp 59–67 | Cite as

Development of refractory silicate-yttria-stabilized zirconia dual-layer thermal barrier coatings

  • Yirong He
  • Kang N. Lee
  • Surendra Tewari
  • Robert A. Miller
Article

Abstract

Development of advanced thermal barrier coatings (TBCs) is the most promising approach for increasing the efficiency and performance of gas turbine engines by enhancing the temperature capability of hot section metallic components. Spallation of the yttria-stabilized zirconia (YSZ) top coat, induced by the oxidation of the bond coat coupled with the thermal expansion mismatch strain, is considered to be the ultimate failure mode for current state-of-the-art TBCs. Enhanced oxidation resistance of TBCs can be achieved by reducing the oxygen conductance of TBCs below that of thermally grown oxide (TGO) alumina scale. One approach is incorporating an oxygen barrier having an oxygen conductance lower than that of alumina scale. Mullite, rare earth silicates, and glass ceramics have been selected as potential candidates for the oxygen barrier. This paper presents the results of cyclic oxidation studies of oxygen barrier/YSZ dual-layer TBCs.

Keywords

TBC mullite silicates oxygen barrier APS sputtering small particle plasma spray 

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Copyright information

© ASM International 2000

Authors and Affiliations

  • Yirong He
    • 1
  • Kang N. Lee
    • 1
  • Surendra Tewari
    • 1
  • Robert A. Miller
    • 2
  1. 1.Cleveland State UniversityCleveland
  2. 2.NASA Glenn Research CenterCleveland

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