On the effects of hot spot formation during MW-assisted synthesis of Cf/SiC composites by reactive melt infiltration: Experimental simulations through high temperature treatments |
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| Affiliation: | 1. Instituto Universitario de Materiales de Alicante (IUMA), University of Alicante, Apdo. 99, 03080 Alicante, Spain;2. Materials Engineering Department, Purdue University, West Lafayette, IN, USA;3. Centre for Materials Science and Nanotechnology, Department of Chemistry, University of Oslo, Oslo, Norway;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing, 100081, China;3. School of Physics and Electronic Information, Yan’ an University, Yan’ an, 716000, China;1. Universidade Federal de São Carlos, São Paulo, Brazil;2. ETH Zürich, Zürich, Switzerland;3. BASF Construction Solutions GmbH, Trostberg, Germany;4. Center for Advanced Structural Ceramics, Department of Materials, Imperial College London, Royal School of Mines, Exhibition Road, SW7 2AZ London, UK;1. Empa – Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland;2. EPFL – Laboratory for Mechanical Metallurgy, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland;3. Institute for Nonferrous Metallurgy and Purest Materials, TU Bergakademie Freiberg, Freiberg, Germany;4. SUPSI – Scuola universitaria professionale della Svizzera italiana, Manno, Switzerland;5. Institute of Ceramic, Glass and Construction Materials, TU Bergakademie Freiberg, Freiberg, Germany;1. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, 243002, China;2. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;3. School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, 150001, China;1. The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;2. School of Science, Wuhan University of Technology, Wuhan, 430070, China |
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| Abstract: | Synthesis of SiC-based composites using microwave(MW)-assisted reactive infiltration is a promising way to obtain these materials at lower costs due to a reduction in processing time and energy consumption. Hot spots are likely to form during this process due to the different dielectric properties of the various phases and the exothermic nature of the reaction between Si and C. To study these effects Cf/SiC composites were subjected to high-temperature treatments (1800, 2000, 2200 °C) to simulate hot spots within the material. Microstructural changes were evaluated after the thermal treatments and thermo-mechanical properties were measured and correlated to the microstructural changes. Our results indicate that evaporation of silicon is the primary damaging mechanism, causing a decrease in the bending strength of the composite due to formation of porosity and a volume increase. These effects are countered by the densification of carbon phases that improve the intrinsic thermal properties of the material. |
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| Keywords: | Microwaves Reactive infiltration SiC |
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