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Thermal barrier coating application of zircon sand

  • P. Ramaswamy
  • S. Seetharamu
  • K. B. R. Varma
  • K. J. Rao
Article

Abstract

Naturally occurring zircon sand was plasma spray coated on steel substrates previously coated with NiCrAlY bond coat. The coatings were characterized for their microstructure, chemical composition, thermal shock resistance, and the nature of structural phases present. The as-sprayed coatings consisted of t-ZrO2 (major phase), m-ZrO2, ZrSiO4 (minor phases), and amorphous SiO2. These coatings, when annealed at 1200 °C/1.44 × 104s yielded a ZrSiO4 phase as a result of the reaction between ZrO2 and SiO2. Dramatic changes occurred in the characteristics of the coatings when a mixture of zircon sand and Y2O3 was plasma spray coated and annealed at 1400 °C/1.44 × 104s. The t-ZrO2 phase was completely stabilized, and these coatings were found to have considerable potential for thermal barrier applications.

Keywords

plasma spray stabilized ZrO2 thermal barrier coating thermal shock resistance zircon sand 

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Copyright information

© ASM International 1999

Authors and Affiliations

  • P. Ramaswamy
    • 1
  • S. Seetharamu
    • 1
  • K. B. R. Varma
    • 2
  • K. J. Rao
    • 2
  1. 1.Materials Technology DivisionCentral Power Research InstituteBangaloreIndia
  2. 2.Materials Research CenterIndian Institute of ScienceBangaloreIndia

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