Sintering behavior of SiO2 aerogel composites reinforced by mullite fibers via in-situ rapid heating TEM observations |
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| Affiliation: | 1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, PR China;2. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom;1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China;3. Science and Technology on Advanced Ceramic Fiber and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China;4. Key Laboratory of Polar Materials and Devices (MOE) and Department of Electronics, East China Normal University, 500 Dongchuan Rd., Shanghai, 200241, China;1. MOE Key Laboratory of Thermo-Fluid Science and Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. Xi’an Thermal Power Research Institute Co., Ltd., Xi’an 710054, China;1. School of Energy and Power Engineering, Beihang University, P.O. Box 405, Beijing 100191, China;2. National Key Laboratory of Science and Technology on Advanced Ceramic Fibers and Composites, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | The direct in situ TEM imaging method is adopted to investigate the sintering behavior of SiO2 aerogels during the rapid heating process. The structural evolution of SiO2 aerogels and composites at different times during the heat treatment process are further investigated via SEM, FT-IR, BET and XRD. The results indicate that the shrinkage of the SiO2 aerogels and composites primarily occurs during the initial stage of the heating process (within 20 min) with the shrinkage primarily linked to the fusion of small aerogel particles at high temperatures. The aerogel structure then stabilizes with no further shrinkage observed as the heating process continues. The heat treatment process only promotes the space rearrangement and fusion of small aerogel particles with no observed changes to the amorphous structure of the aerogels, and the small-sized particles fusion was the main causes for the structural evolution of SiO2 aerogels and composites under rapid heating condition. |
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| Keywords: | Sintering behavior In-situ TEM Shrinkage Fusion |
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