Tailored microstructure of zirconia and hafnia-based thermal barrier coatings with low thermal conductivity and high hemispherical reflectance by EB-PVD

J. Singh, D. E. Wolfe, R. A. Miller, J. I. Eldridge, Dong Ming Zhu

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Zirconia and hafnia based thermal barrier coating materials were produced by industrial prototype electron beam-physical vapor deposition (EB-PVD). Columnar microstructure of the thermal barrier coatings were modified with controlled microporosity and diffuse sub-interfaces resulting in lower thermal conductivity (20-30% depending up on microporosity volume fraction), higher thermal reflectance (15-20%) and more strain tolerance as compared with standard thermal barrier coatings (TBC). The novel processed coating systems were examined by various techniques including scanning electron microscopy (SEM), X-ray diffraction, thermal conductivity by laser technique, and hemispherical reflectance.

Original languageEnglish (US)
Pages (from-to)1975-1985
Number of pages11
JournalJournal of Materials Science
Volume39
Issue number6
DOIs
StatePublished - Mar 15 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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