Effect of Thermal Exposure on Mechanical Properties of a Plasma-Sprayed Nanostructured Thermal Barrier Coating |
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Authors: | Zilong Wu Liyong Ni Qinghe Yu Chungen Zhou |
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Affiliation: | (1) Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China;(2) Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beijing, China |
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Abstract: | A nanostructured thermal barrier coating (TBC) was deposited by air plasma spraying. The effect of microstructural evolution on nano-hardness and Young’s modulus has been investigated by nanoindentation technique after exposure at 1200 °C in air for different times. The results showed that the sintering process of nanostructured TBC at 1200 °C was divided into two stages. TBC completely kept the nanostructure with the grain size <100 nm at the first stage of 10 h thermal exposure. The nanostructure was lost gradually at the second stage from 10 to 200 h thermal exposure. During the first stage, nano-hardness and Young’s modulus increased rapidly for TBC densification, and Weibull bimodal distribution of both Young’s modulus and nano-hardness disappeared as grain grew and most microcracks were healed. The structure of TBC did not change basically, and nano-hardness and Young’s modulus increased slightly at the second stage. |
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