Thermal conductivity and phase stability of plasma sprayed ZrO2-Y2O3-La2O3 coatings

M. Matsumoto, K. Aoyama, H. Matsubara, K. Takayama, T. Banno, Y. Kagiya, Y. Sugita

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69 Citations (Scopus)

Abstract

Thermal conductivity and phase stability of La2O3, Y2O3 stabilized ZrO2 plasma sprayed coatings were investigated. La2O3 was selected as a stabilizer because it had a significant effect on reducing densification of Y2O3 stabilized ZrO2 (YSZ). The developed coating showed low thermal conductivity even after high temperature exposure due to its high resistance to sintering. However, phase stability and thermal cycle life of the coating decreased as the amount of La2O3 was increased. It was concluded that optimum amount of La2O3 addition was about 1 mol% to suppress sintering with little degradation of other properties.

Original languageEnglish
Pages (from-to)31-35
Number of pages5
JournalSurface and Coatings Technology
Volume194
Issue number1
DOIs
Publication statusPublished - 2005 Apr 20

Keywords

  • Lanthania
  • Phase stability
  • Sintering
  • Thermal barrier coating (TBC)
  • Thermal conductivity
  • Yttria stabilized zirconia (YSZ)

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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