Microstructures and properties of plasma-sprayed segmented thermal barrier coatings

Hongbo Guo, Seiji Kuroda, Hideyuki Murakami

Research output: Contribution to journalArticle

105 Citations (Scopus)


Thermal barrier coatings (TBCs) with different levels of segmentation crack density were produced by spraying two types of ZrO2-8Y 2O3 powders. The fused and crushed powder has a greater capability of forming segmented coatings than the hollow sphere (HOSP) one. The highly segmented coatings reveal much lower porosity compared with traditionally sprayed coatings, thereby compromising the property of thermal insulation of TBCs. Microstructure and thermal conductivity of the HOSP coatings are more sensitive to the changes in spray conditions. Segmentation cracks had a strong influence in decreasing Young's modulus of coatings. Fifty hours heat treatment at 1250°C had little effect on the mechanical property of the highly segmented coatings.

Original languageEnglish
Pages (from-to)1432-1439
Number of pages8
JournalJournal of the American Ceramic Society
Issue number4
Publication statusPublished - 2006 Apr 1


ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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