High temperature corrosion resistance of electrically conductive nitrogen doped silicon carbide ceramics in molten fluorides |
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| Affiliation: | 1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava 84536, Slovakia;2. Centre of Excellence for Advanced Materials Application, CEMEA, Dúbravská cesta 9, Bratislava 84511, Slovakia;3. Department of Materials Science and Engineering, University of Seoul, Seoul 02504, Republic of Korea;4. Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava 84513, Slovakia;5. Loire Valley Institute for Advanced Studies, 1 rue Dupanloup, Orléans 45000, France;6. CEMHTI, Conditions Extrêmes et Matériaux: Haute Température et Irradiation UPR3079, CNRS, 1D Av. de la Recherche Scientifique CS 90055, Orléans 45071, France;1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;2. College of Aerospace Engineering, Chongqing University, Chongqing 400030, China;1. Functional Materials and Acousto-optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;2. Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, China;3. School of Physics and Electronic Engineering, Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and, Processing, Wuhan University of Technology, Wuhan 430070, China;2. Research Center for Materials Science and Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;2. Hebei Key Laboratory of Boron Nitride Micro- and Nano-Materials, Hebei University of Technology, Tianjin 300130, China |
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| Abstract: | Electrically conductive nitrogen-doped SiC ceramics were exposed to molten FLiNaK at 700 °C for 100, 200, and 500 h, and at 1000 °C for 100 h in Ar atmosphere. The SEM-EDX investigations of corroded samples showed that the main corrosion attack proceeds through the intergranular phase, where the fluoride melt interacts with the oxide phases and partly dissolves also the SiC grains. It was proved that N-doped SiC has good corrosion resistance against molten FLiNaK. After corrosion at 700 °C for 100, 200, and 500 h the corroded layer thicknesses were 85, 90, and 120 µm, respectively. |
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| Keywords: | Molten salts FLiNaK Silicon carbide SEM High temperature corrosion |
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