Air Plasma-Sprayed Yttria and Yttria-Stabilized Zirconia Thermal Barrier Coatings Subjected to Calcium-Magnesium-Alumino-Silicate (CMAS)
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- 作者：Wenshuai Li (1) (2) (3)
Huayu Zhao (1) (2)
Xinghua Zhong (1) (2)
Liang Wang (1) (2)
Shunyan Tao (1) (2) - 关键词：CMAS ; plasma spraying ; thermal barrier coatings ; yttria ; yttria ; stabilized zirconia
- 刊名：Journal of Thermal Spray Technology
- 出版年：2014
- 出版时间：August 2014
- 年：2014
- 卷：23
- 期：6
- 页码：975-983
- 全文大小：1,615 KB
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Huayu Zhao (1) (2)
Xinghua Zhong (1) (2)
Liang Wang (1) (2)
Shunyan Tao (1) (2)
1. The Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai, 201899, China
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 201899, China
3. University of Chinese Academy of Sciences, Beijing, 100039, China - ISSN：1544-1016
文摘
Yttria (Y2O3) and zirconia (ZrO2) stabilized by 8 and 20?wt.%Y2O3 thermal barrier coatings (TBCs) subjected to calcium-magnesium-alumino-silicate (CMAS) have been investigated. Free-standing Y2O3, 8 and 20?wt.%YSZ coatings covered with synthetic CMAS slurry were heated at 1300?°C in air for 24?h in order to assess the effect of Y2O3 on the corrosion resistance of the coatings subjected to CMAS. The microstructures and phase compositions of the coatings were characterized by SEM, EDS, XRD, RS, and TEM. TBCs with higher Y2O3 content exhibited better CMAS corrosion resistance. Phase transformation of ZrO2 from tetragonal (t) to monoclinic (m) occurred during the interaction of 8YSZ TBCs and CMAS, due to the depletion of Y2O3 in the coating. Some amounts of original c-ZrO2 still survived in 20YSZ TBCs along with a small amount of m-ZrO2 that appeared after reaction with CMAS. Furthermore, Y2O3 coating was found to be particularly highly effective in resisting the penetration of molten CMAS glass at high temperature (1300?°C). This may be ascribed to the formation of sealing layers composed of Y-apatite phase [based on Ca4Y6 (SiO4)6O and Y4.67(SiO4)3O] by the high-temperature chemical interactions of Y2O3 coating and CMAS glass.