Degradation Mechanisms of an Advanced Jet Engine Service-Retired TBC Component
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概要
- 論文の詳細を見る
Current use of TBCs is subjected to premature spallation failure mainly due to the formation of thermally grown oxides (TGOs). Although extensive research has been carried out to gain better understanding of the thermo - mechanical and -chemical characteristics of TBCs, laboratory-scale studies and simulation tests are often carried out in conditions significantly differed from the complex and extreme environment typically of a modern gas-turbine engine, thus, failed to truly model service conditions. In particular, the difference in oxygen partial pressure and the effects of contaminants present in the engine compartment have often been neglected. In this respect, an investigation is carried out to study the in-service degradation of an EB-PVD TBC coated nozzle-guide vane. Several modes of degradation were observed due to three factors: 1) presence of residual stresses induced by the thermal-expansion mismatches, 2) evolution of bond coat microstructure and subsequent formation of oxide spinels, 3) deposition of CMAS on the surface of TBC.
著者
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KAWAGISHI Kyoko
National Institute for Materials Science
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Harada Hiroshi
National Insitute Of Information And Communication Technology
-
WU Rudder
National Institute for Materials Science
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OSAWA Makoto
National Institute for Materials Science
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YOKOKAWA Tadaharu
National Institute for Materials Science
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