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4831 |
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Evaluation of thermo-mechanical properties and microstructure of thermal barrier coatings in cyclic thermal exposure |
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Sangwon Myoung* / Doosan Heavy Industries & Construction Co., Ltd./Corporate R&D Institute , Republic of KOREA Byung-Il Yang / Doosan Heavy Industries and Construction Co., Ltd./Corporate R&D Institute, Republic of Korea In-Soo Kim/ Doosan Heavy Industries and Construction Co., Ltd./Corporate R&D Institute, Republic of Korea Kwang-Yong Park/ Doosan Heavy Industries and Construction Co., Ltd./Corporate R&D Institute, Republic of Korea Kyung-Ic Jang/ Doosan Heavy Industries and Construction Co., Ltd./Corporate R&D Institute, Republic of Korea Chan-Young Park/ Doosan Heavy Industries and Construction Co., Ltd./Corporate R&D Institute, Republic of Korea |
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Thermo-mechanical properties and failure of TBCs are closely related to their microstructure. By making good use of the lower expense and thermal conductivity plasma spray is a popular technique to prolong the lifetime of turbine. Therefore, the control of microstructure in TBCs including the top and bond coats is proposed as a new strategy for advanced coatings. For preparing the TBCs, powder feeding rate, gun distance, feed stock species were controlled, and then microstructures of both bond and top coats were designed and deposited. In order to understand the effects of microstructural design on the thermal durability and mechanical property of TBCs, the microstructural evolution in the top and bond coats was investigated with cyclic thermal exposure and the mechanical property with feedstock powder was estimated, including the thermal stability at the interface of the bond and top coats. Cyclic thermal exposure tests were performed at 1100 °C. The relationship between the microstructure evolution and thermal fatigue behavior was investigated, and the advantages of designed microstructure for thermal stability and durability of the TBCs with thermal fatigue tests will be discussed. |