Thermal conductivity and thermal stability of zirconia and hafnia based thermal barrier coatings by EB-PVD for high temperature applications

Jogender Singh, Douglas Edward Wolfe, Robert Miller, Jeff Eldridge, Dong Ming Zhu

Research output: Contribution to journalConference article

6 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, and thermal conductivity by laser technique, hemispherical reflectance and thermal cyclic tests. The test results showed the tailored-microstructural TBC offered superior performance over the conventional thermal barrier coatings (ZrO 2 -8 wt.% Y 2O 3).

Original languageEnglish (US)
Pages (from-to)579-586
Number of pages8
JournalMaterials Science Forum
Volume455-456
StatePublished - Jul 28 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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