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| Abstract No.: |
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| Title: |
Sintering and phase transformation behavior of high-purity nano-crystallized thermal barrier coatings at very high temperatures
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| Authors: |
Kang Yuan* / BGRIMM Technology Group, P.R. China
Yueguang Yu/ Beijing General Research Institute of Mining and Metallurgy, China
Jie Shen/ Beijing General Research Institute of Mining and Metallurgy, China
Xiaojuan Ji/ Beijing General Research Institute of Mining and Metallurgy, China
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| Abstract: |
High-purity nanocrystallized (HN) yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were manufactured using air-plasma spraying (APS) process. Comparing to a traditional YSZ, the HN-YSZ has a lower content of impurity oxides such as SiO2. Nanocrystallized microstructures are formed in coating splats, which gives the coating outstanding anti-sintering property at high temperatures. However, phase transformation occurs in YSZ TBCs above 1200 deg. C, which causes coating spallation failure especially in a thermal cyclic test. In this study, the HN-YSZ and a commercial YSZ TBC coatings were aged at temperatures between 1100 and 1400 deg. C. The sintering and phase transformation behavior of these coatings were compared. The function of the nanocrystallized structures in the HN-YSZ coatings will be discussed.
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