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Influence of pre-treatment on the growth behavior of TGO on MCrAlY bond coat surface

  • Xi'an Jiaotong University

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The thermally grown oxide (TGO), formed on the bond coat (BC) surface of thermal barrier coatings (TBCs), has a significant impact on the TBCs life time. In order to reduce growth kinetics of TGO, vacuum pre-treatment was taken for some bond coats before pre-oxidation and isothermal oxidation in air. The other bond coats were directly subjected to pre-oxidation and isothermal oxidation. The grain size and grain boundary distribution of the TGO were analyzed by electron backscattered diffraction (EBSD). Element diffusion was taken into account to analyze growth kinetics of the TGO. Results indicate that the change of Al2O3 TGO thickness with isothermal oxidation duration doesn't fit well to conventional oxidation theory, i.e. exponential function. It is attributed to the change of the grain structure during the pre-treatment. This mechanism would benefit the development of long-life and highly reliable TBCs.

Original languageEnglish
Title of host publicationASM International - International Thermal Spray Conference and Exposition, ITSC 2015
EditorsArvind Agarwal, Yuk-Chiu Lau, Andre McDonald, Giovanni Bolelli, Filofteia-Laura Toma, Amadeu Concustell, Christian A. Widener, Erja Turunen
PublisherASM International
Pages107-113
Number of pages7
ISBN (Electronic)9781510811546
StatePublished - 2015
EventInternational Thermal Spray Conference and Exposition, ITSC 2015 - Long Beach, United States
Duration: 11 May 201514 May 2015

Publication series

NameProceedings of the International Thermal Spray Conference
Volume1

Conference

ConferenceInternational Thermal Spray Conference and Exposition, ITSC 2015
Country/TerritoryUnited States
CityLong Beach
Period11/05/1514/05/15

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