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| Abstract No.: |
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Scheduled at:
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Thursday, May 12, 2016, Yellow River Hall 12:20 PM
Power Generation III
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| Title: |
The correlation of the TBC lifetimes in thermal gradient thermal cycling test and isothermal cycling test by TGO effects
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| Authors: |
Chang-Jiu Li* / Xi'an Jiaotong University, P.R. China
Hang Ding/ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xian Jiaotong University, China
Hui Dong/ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xian Jiaotong University, China
Guan-Jun Yang/ State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xian Jiaotong University, China
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| Abstract: |
Two types of typical thermal cycling tests are used for the evaluation of thermal lifetime of thermal barrier coatings: those are thermal gradient thermal cycling test (so-called rig-burn test) and isothermal cycling test. There are diverse explanations to test results up to now. Although certain correlations should exist between the results obtained by two types of tests, no evident parameters in two tests were directly related possibly due to large range of difference test conditions. In this investigation, a series of TBC samples with carefully prepared different Al2O3-based TGO thicknesses were used for both thermal gradient thermal cycling and isothermal cycling tests. The relationships between thermal cycling lifetime and TGO thickness were obtained for two types of tests. It was found that TGO thickness presents the same influence despite of different thermal cycling tests. The results reveal the existence of the critical TGO thickness over which accelerated cracking takes place during tests. Moreover, the values of the critical TGO thickness for two tests are comparable. The results evidently sugges that the lifetimes during different thermal cycling tests can be correlated by TGO growing behavior.
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