Thermal conductivity and stability of multilayered thermal barrier coatings under high temperature annealing conditions

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

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Pyrochlore oxides have most of the relevant attributes for use as next generation thermal barrier coatings (TBCs) such as phase stability, low sintering kinetics and low thermal conductivity. One of the issues with the pyrochlore oxides is their lower toughness and therefore higher erosion rate compared to the current state of the art TBC material, yttria (6-8wt.%) stabilized zirconia (YSZ). In this work, sintering characteristics were investigated for novel multilayered coating consisted of alternating layers of pyrochlore oxide viz. Gd2Zr2O7 and t' low k (rare earth oxide doped YSZ). Thermal gradient and isothermal high temperature (1316°C) annealing conditions were used to investigate sintering and cracking in these coatings. The results are then compared with that of relevant monolayered coatings and a baseline YSZ coating.

Original languageEnglish (US)
Pages (from-to)1605-1612
Number of pages8
JournalJournal of the European Ceramic Society
Volume35
Issue number5
DOIs
StatePublished - May 1 2015

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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