Synthesis and properties of multiscale porosity TiC-SiC ceramics |
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| Affiliation: | 1. Laboratoire des Composites Thermostructuraux, UMR 5801 (CNRS-CEA-Safran-Univ. Bordeaux), 3, allée de La Boétie, 33600 Pessac, France;2. CEA-DAM, Le Ripault, 37260 Monts, France;1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China;2. Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China;1. Department of Mechanical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Department of Engineering Sciences, Faculty of Advanced Technologies, University of Mohaghegh Ardabili, Namin, Iran;3. Department of Engineering Sciences, Faculty of Advanced Technologies, Sabalan University of Advanced Technologies (SUAT), Namin, Iran;4. Department of Chemical Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;5. Koç University Surface Science and Technology Center (KUYTAM), Sariyer, Istanbul, 34450, Turkey;1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, People''s Republic of China;2. Nano Convergence Material Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea;1. School of Materials Science and Engineering, Central South University, Changsha, 410083, PR China;2. Hunan Bossco Environmental Protection Co., Ltd., Changsha, 410083, PR China |
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| Abstract: | A process combining the pyrolysis of a lignocellulosic structure and reactive gas treatments has been developed to prepare porous TiC-SiC ceramics for solar receivers. The natural micro-porosity of balsa was complemented by a high open macro-porosity by laser cutting a periodical arrangement of parallel channels. The lignocellulosic structure was first pyrolysed into carbon. This reactive carbon material was then converted into TiC by Reactive Chemical Vapor Deposition (RCVD) using TiCl4/H2. After controlling the absence of cracks due to volume changes, the TiC structure was finally infiltrated by the Chemical Vapor Infiltration (CVI) of SiC using CH3SiCl3/H2. The density, porous structure, elemental and phase compositions, oxidation behavior and crushing strength were assessed after pyrolysis, RCVD and CVI. The SiC CVI coating significantly improves the compressive strength, the oxidation resistance and the thermal properties. The SiC layer is no longer fully protective at high temperature but the mechanical properties remain reasonably high. |
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| Keywords: | Solar power Biomorphic ceramics RCVD CVI TiC SiC |
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