Adhesion strength of ceramic top coat in thermal barrier coatings subjected to thermal cycles: Effects of thermal cycle testing method and environment

Masakazu Okazaki, Satoshi Yamagishi, Yasuhiro Yamazaki, Kazuhiro Ogawa, Hiroyuki Waki, Masayuki Arai

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

This paper deals with the adhesion strength of ceramic top coat in thermal barrier coatings (TBCs) subjected to thermal cycles under several different test conditions. Here the TBC specimens consisting of 8% yttria stabilized zirconia, CoNiCrAlY alloy bond coat and Ni-base superalloy were prepared by plasma spraying. The isothermal exposure and the thermal cycles were applied to the TBC specimens by several conditions at high temperatures. A series of the test results clearly demonstrated that the adhesion strength of the top coat was significantly changed by the application of thermal cycles and by the isothermal exposure. It was also found that the thermal fatigue damage might be evolved depending on of the testing method by which the thermal cycles are applied. Some background of these findings were discussed, based on the measurements of elastic modulus, tensile strength, and thermal conductivity of the ceramic top coat, as well as both the thermally grown oxide at the top coat/bond coat interface and the residual stress in the TBC specimens.

Original languageEnglish
Pages (from-to)33-39
Number of pages7
JournalInternational Journal of Fatigue
Volume53
DOIs
Publication statusPublished - 2013 Aug

Keywords

  • Adhesion strength
  • Elastic modulus
  • Isothermal exposure
  • Thermal Barrier Coatings (TBCs)
  • Thermal cycle

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Adhesion strength of ceramic top coat in thermal barrier coatings subjected to thermal cycles: Effects of thermal cycle testing method and environment'. Together they form a unique fingerprint.

Cite this