Multilayered thermal barrier coating architectures for high temperature applications

Douglas Edward Wolfe, Michael P. Schmitt, Dongming Zhu, Amarendra K. Rai, Rabi Bhattacharya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

Pyrochlore oxides of the rare earth zirconates are excellent candidates for use as thermal barrier coating (TBC) materials in highly efficient turbine engine operation at elevated temperatures (>1300°C). Pyrochlore oxides have most of the relevant attributes for use at elevated temperatures such as phase stability, low sintering kinetics and low thermal conductivity. One of the issues with the pyrochlore oxides is their lower toughness compared to the currently used TBC material viz. yttria (6-8 wt. %) stabilized zirconia (YSZ). In this work, arguments are advanced in favor of a multilayered coating approach to enhance erosion performance by improving toughness and lowering thermal conductivity of the TBCs. Unique multilayered coating design architectures were fabricated with alternating layers of pyrochlore oxide viz Gd2Zr 2O7 and low k TBC (rare earth oxide doped t' YSZ) utilizing electron beam physical vapor deposition (EB-PVD) technique to reduce overall rare earth oxide content. Microstructure, phase, erosion resistance and thermal conductivity of the as-fabricated multilayered coatings were evaluated and compared with that of the single layered coatings.

Original languageEnglish (US)
Title of host publicationAdvanced Ceramic Coatings and Materials for Extreme Environments II - A Collection of Papers Presented at the 36th International Conference on Advanced Ceramics and Composites, ICACC 2012
Pages3-18
Number of pages16
Edition3
StatePublished - Apr 8 2013
EventAdvanced Ceramic Coatings and Materials for Extreme Environments II - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012 - Daytona Beach, FL, United States
Duration: Jan 22 2012Jan 27 2012

Publication series

NameCeramic Engineering and Science Proceedings
Number3
Volume33
ISSN (Print)0196-6219

Other

OtherAdvanced Ceramic Coatings and Materials for Extreme Environments II - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012
Country/TerritoryUnited States
CityDaytona Beach, FL
Period1/22/121/27/12

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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