Al2O3–SiC composites prepared by infiltration of pre-sintered alumina with a poly(allyl)carbosilane |
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| Authors: | Du?an Galusek Róbert Klement Jaroslav Sedlá?ek Miroslav Balog Claudia Fasel J Zhang MA Crimp Ralf Riedel |
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| Affiliation: | 1. Vitrum Laugaricio – Joint Glass Centre of the Institute of Inorganic Chemistry, Slovak Academy of Sciences, Alexander Dub?ek University of Tren?ín, Faculty of Chemical Technology STU, and RONA, j.s.c., Tren?ín, Slovak Republic;2. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, USA;3. Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany;1. Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People''s Republic of China;2. School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People''s Republic of China;1. College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, Jiaxing, 314001, China;2. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China;3. Low Carbon Energy Institute, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou, 221008, China;4. South African Institute for Advanced Materials Chemistry, University of the Western Cape, Cape Town, 7535, South Africa;1. Institute of Physics and Mechanics, Peter the Great Polytechnic University, St-Petersburg 195251, Russia;2. Central Research Institute of Structural Materials ‘‘Prometey’’, St-Petersburg 191015, Russia;3. Mechanical Engineering Research Institute of the Russian Academy of Science, Nizhny Novgorod 603024, Russia |
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| Abstract: | The Al2O3/SiC nanocomposites containing 3–8 vol.% SiC were prepared through infiltration and in situ thermal decomposition of a preceramic polymer SiC precursor (poly(allyl)carbosilane) in pre-sintered alumina matrix. The volume fraction of SiC, and the microstructure of composites were adjusted by concentration of the polymer solution, and by the conditions of pyrolysis and sintering. The specimens were densified by pressureless sintering at temperatures between 1550 and 1850 °C in flowing argon. The use of powder bed producing SiO, CO and other volatile species suppressed decomposition reactions in the composites and was vital for their successful densification. The experimental results are discussed against thermodynamic analysis of the system Al2O3/SiC/SiO2 in an inert Ar atmosphere. |
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