The effect of pre-oxidation atmosphere on the durability of EB-PVD thermal barrier coatings with CoNiCrAlY bond coats

Mineaki Matsumoto, Takeharu Kato, Kazuyuki Hayakawa, Norio Yamaguchi, Satoshi Kitaoka, Hideaki Matsubara

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The effects of pre-oxidation heat treatment on oxidation behavior and thermal cycle life of electron-beam physical deposited (EB-PVD) thermal barrier coatings (TBCs) with CoNiCrAlY bond coats were investigated as a function of the pO2 of the pre-oxidation atmosphere. The pO2 of the pre-oxidation atmosphere was controlled by using a solid-state electrochemical oxygen pump system. The purity and microstructure of the continuous Al2O3 layer formed on the bond coat during pre-oxidation at 1050 °C were highly influenced by the pO2 of the atmosphere. High purity α-Al2O3 with large grain size was formed on the bond coats under a pO2 of 10- 12-10- 9 Pa, which resulted in a lower growth rate of TGO and longer lifetime.

Original languageEnglish
Pages (from-to)2743-2748
Number of pages6
JournalSurface and Coatings Technology
Volume202
Issue number12
DOIs
Publication statusPublished - 2008 Mar 15

Keywords

  • Oxygen partial pressure
  • Pre-oxidation
  • Thermal barrier coating
  • Thermally grown oxide

ASJC Scopus subject areas

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

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