Comparison of hot corrosion resistance of Sm2Zr2O7 and (Sm0.5Sc0.5)2Zr2O7 ceramics in Na2SO4+V2O5 molten salt |
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| Affiliation: | 1. School of Materials Science and Engineering, Tianjin University, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, China;3. Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, No. 92, Weijin Road, Tianjin 300072, China;1. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300072, China;2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China;1. School of Materials and Energy, Guangdong University of Technology, Guangzhou Higher Education Mega Center 100#, Guangzhou, 510006, China;2. Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou, 510006, China;3. Key Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, 510640, China;1. Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. College of Physics and Electronic Information Engineering, Qinghai University for Nationalities, Xining 810007, China;3. Guizhou Radio and Television University, Guiyang 550004, China |
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| Abstract: | Sm2Zr2O7 and (Sm0.5Sc0.5)2Zr2O7 ceramics were fabricated by a chemical co-precipitation and calcination method, and their hot corrosion behaviors in Na2SO4+V2O5 molten salt were investigated. Hot corrosion tests were carried at 700 °C, 800 °C and 900 °C for 4 h, and corroded surfaces were investigated using X-ray diffractometer and scanning electron microscopy. The corrosion products of Sm2Zr2O7 ceramics were composed of SmVO4 and monoclinic-ZrO2, while those of (Sm0.5Sc0.5)2Zr2O7 ceramic consisted of SmVO4 and Zr5Sc2O13. Considering the fact that Zr5Sc2O13 is more desirable than monoclinic-ZrO2 for thermal barrier coating applications, (Sm0.5Sc0.5)2Zr2O7 showed better corrosion resistance to Na2SO4+V2O5 salt than Sm2Zr2O7. The hot corrosion mechanisms of Sm2Zr2O7 and (Sm0.5Sc0.5)2Zr2O7 in Na2SO4+ V2O5 salt were discussed in detail. |
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| Keywords: | Thermal barrier coating Hot-corrosion Molten salt |
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