Thermal cycling behavior of plasma sprayed segmented thermal barrier coatings

Hongbo Guo, Hideyuki Murakami, Seiji Kuroda

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24 Citations (Scopus)

Abstract

Thermal barrier coatings (TBCs) with different levels of segmentation crack densities (Ds) were sprayed at different substrate temperatures (Ts). Thermal cycling resistance of the TBC specimen was examined. The segmented coating significantly improved the thermal cycling resistance as compared to the traditional non-segmented coating. Maximum thermal cycling lifetimes were achieved in the coating with a crack density level of 2.2 mm -1. New segmentation cracks were hardly generated during thermal cycling testing. Spallation of segments within the segmented coating occurred, which is different from spallation of the whole coating from substrate in the case of traditional coating. Oxidation of bond coat and limited phase decomposition of YSZ topcoat were considered as not responsible for the failure of TBCs.

Original languageEnglish
Pages (from-to)306-309
Number of pages4
JournalMaterials Transactions
Volume47
Issue number2
DOIs
Publication statusPublished - 2006 Feb 1
Externally publishedYes

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Keywords

  • Failure mechanism
  • Plasma spray
  • Segmentation cracks
  • Thermal barrier coatings
  • Thermal cycling

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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