Hot corrosion behavior of NdYbZr2O7 exposed to V2O5 and Na2SO4 + V2O5 molten salts |
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| Affiliation: | 1. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;2. School of Energy and Powder Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;3. Key Laboratory of High-Temperature Structure Materials & Coatings Technology (Ministry of Industry and Information Technology), Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;4. Research Center of Modern Surface and Interface Engineering, Anhui University of Technology, Maanshan 243002, China;1. School of Materials Science and Engineering, Beihang University, Beijing, China;2. Key Laboratory of High-temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology), Beihang University, Beijing, China;3. Research Institute for Frontier Science, Beihang University, Beijing, China;1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China;2. School of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China;1. State Key Laboratory of Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;3. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;1. School of Materials Science and Engineering, Tianjin University, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin Key Laboratory of Advanced Joining Technology, No. 92, Weijin Road, Tianjin 300072, China;2. Surface Engineering Research Institute, Chinese Academy of Agricultural Mechanization Sciences, Beijing 100083, China;3. School of Materials Science and Engineering, Central South University, Changsha 410083, China;4. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China |
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| Abstract: | In order to evaluate the application prospects of NdYbZr2O7 as a novel TBC material, NdYbZr2O7 ceramic was synthesized via a solid-state reaction sintering method, and its hot corrosion behavior exposed to V2O5 and Na2SO4 + V2O5 molten salts at 900 °C, 1000 °C, and 1100 °C was comparatively investigated. For the V2O5 salt, the primary corrosion products were granular (Nd,Yb)VO4 as well as cube-like m-ZrO2. The corrosion layer consisted of two distinct layers, one of which was Zr-rich layer and another was V-rich layer. In the case of Na2SO4 + V2O5, NaVO3, as an intermediate product, played an important role in dissolving the NdYbZr2O7 ceramic. Herein, the (Nd,Yb)VO4 exhibited a rod/plate-like morphology, which could be attributed to the synergistic effect of low driving force and low nucleation rate. Since the molten salt infiltration rate was superior to the pore filling rate throughout the hot corrosion, the thickness of corrosion layer increased with the rise of temperature. The hot corrosion mechanisms of NdYbZr2O7 ceramic in various molten salts were discussed based on the phase diagram, Lewis acid-base rule and chemical thermodynamics. On this basis, the NdYbZr2O7 coating was prepared by atmospheric plasma spray (APS) and it exhibits a higher corrosion resistance compared to YSZ coating. |
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| Keywords: | Thermal barrier coating Hot corrosion APS |
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