Microstructure evolutions of SiC whiskers at high temperature and its effects on silicon carbide ceramics |
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| Affiliation: | 1. State Key Laboratory of Synthetical Automation for Process Industries, College of Information Science and Engineering, Northeastern University, Shenyang, 110819, China;2. Zhongtian Technology Advanced Materials Co.,Ltd, Nantong, 226009, China;3. Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China;1. Department of Neutron Physics, Czech Academy of Sciences, Nuclear Physics Institute, Husinec-Řež, čp. 130, 250 68 Řež, Czech Republic;2. Department of Physics, Faculty of Science, J.E. Purkyně University, Pasteurova 3544/1, 400 96, Ústi Nad Labem, Czech Republic;3. Department of Inorganic Chemistry, University of Chemistry and Technology in Prague, 166 28, Prague, Czech Republic;4. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2026/5, 121 16, Prague 2, Czech Republic;5. Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlářská 2, 61137, Brno, Czech Republic;6. Department of Material Analysis, FZU - Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21, Prague, Czech Republic;1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai, 201800, China;4. Shanghai Academy of Spaceflight Technology, Shanghai, 201109, China;1. National Key Laboratory of Advanced Casting Technologies, Shenyang Research Institute of Foundry Co., Ltd. CAM, Shenyang, 110022, PR China;2. Department of Mechanical Engineer, Tsinghua University, Beijing, 100084, PR China;3. Key Laboratory of Space Physics, Beijing, 100076, PR China;1. National Engineering Research Center for Green Recycling of Strategic Metal Resource, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China;2. College of Metallurgy and Energy Engineering University Department, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China;3. Ganjiang Innovation Research Institute, Chinese Academy of Sciences, Ganzhou, 341119, Jiangxi, PR China;4. School of Electronic Information and Electrical Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, China |
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| Abstract: | SiC whisker with a single-crystal structure is promising in enhancing the strength and toughness of advanced structural ceramics, owing to its excellent properties. However, studies on its microstructure evolution at high temperature (>2000 °C) are scarce. Herein, SiC whiskers were calcined at 2100 °C, and XRD, SEM, and TEM were employed to analyze microstructure evolutions. Compared with raw whiskers, XRD results indicated serious annihilation of stacking faults after calcination. The annihilation led to the fracture of whiskers and the formation of β-SiC grains, and then partial grains underwent the phase transformation to form hexagonal prism and triangular prism α-SiC grains with diameters of about 10 μm, according to SEM and TEM results. Furthermore, SiC ceramics containing different whisker contents were innovatively fabricated by pressureless solid-state sintering. The flexural strength and fracture toughness of SiC ceramic containing 10 vol% whiskers were 540 MPa and 5.1 MPa m0.5, resulting in 38% and 11% higher values than those without whiskers, respectively. |
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| Keywords: | SiC whiskers Silicon carbide Mechanical properties Microstructure evolution |
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