Thermal shock and fatigue resistance evaluation of functionally graded coating for gas turbine blades by laser heating method

C. Y. Jian, Toshiyuki Hashida, Hideaki Takahashi, Masahiro Saito

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

This paper presents results of thermal shock and fatigue tests conducted on ZrO2-based thermal barrier coating systems under the temperature environments for advanced gas turbines. A CO2 laser heating method was employed to heat two types of cylindrical specimens with conventional two-layer coating and functionally graded coating. Acoustic emission (AE) signals and temperatures were monitored to detect the fracture process of the coating systems. The measurements of AE signals and temperatures were correlated with the growth of coating delamination. In order to investigate the effects of heating rate and cooling rate on the coating fracture, four different heating/cooling thermal cycles were used in the thermal shock and fatigue tests. Using the AE and temperature results, the fracture process of the coating systems is examined, and the delamination growth rate during fatigue tests is determined. Based on the results, a suitable thermal cycle is determined for an accelerated testing method of the ZrO2-based coating systems. Finally, usefulness of application of functionally graded coating systems is discussed.

Original languageEnglish
Pages (from-to)879-889
Number of pages11
JournalComposites Engineering
Volume5
Issue number7
DOIs
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Engineering(all)

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