Mechanistic understanding for degraded thermal barrier coatings

Kazuhiro Ogawa, Tetsuo Shoji, Hisahiko Aoki, Norio Fujita, Taiji Torigoe

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


A two-layer plasma sprayed thermal barrier coating on Ni base superalloy substrate was characterized. The coating was comprised of an inner layer of MCrAIY bond coating and an outer layer of 8 wt% yttria stabilized zirconia (YSZ) thermal barrier coating (TBC). After aging, the thermally grown oxide (TGO) layer at interface between YSZ and MCrAIY was observed. The TGO layer had two different contrast layers in the SEM images. The black one was closer to MCrAIY and the gray one was closer to YSZ. The thickness of both layers increased with aging. Countless porosities at the gray layer and microcrack at YSZ were also observed. Most of the macrocrack grew through the porosities. From this point of view one may say that the mechanism of macrocrack formation is a deterioration of adhesion accompanied by an increase of number of the porosities or the microcrack.

Original languageEnglish
Pages (from-to)507-513
Number of pages7
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Issue number4
Publication statusPublished - 2001 Oct


  • Ceramics
  • Crack propagation
  • Laminated construction
  • Thermal
  • Thermal stress


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