Fabrication and mechanical properties of SiCw/MoSi2–SiC composites by liquid Si infiltration of pyrolyzed rice husk preforms with Mo additions |
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| Affiliation: | 1. Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, D-85738 Garching, Germany;2. Ghent University, Applied Physics Department, B-7000 Gent, Belgium;3. ENEA, Dipartimento FSN, C. R. Frascati, via E. Fermi 45, 00044 Frascati, Roma, Italy;4. ASIPP, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China;5. Politecnico di Torino, Torino, Italy;6. Instituto de Plasmas e Fusão Nuclear, IST, 1049-001 Lisboa, Portugal;1. Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, China;3. MATEIS CNRS UMR5510, Université de Lyon, INSA-Lyon, F-69621 Villeurbanne, France;1. Departament of Chemistry, Federal University of Parana, 81531-990 Curitiba, PR, Brazil;2. Institute of Organic Chemistry, University of Hamburg, Hamburg, Germany;3. Superintendência da Amazônia Oriental—CEPLAC, Belém 66635-110, Brazil;1. Institute of Laser and Opto-electronics, College of Precision Instrument and Opto-electronics Engineering, Tianjin University,Tianjin 300072, China;2. Key Laboratory of Opto-electronics Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China;3. College of Physics Science, Nankai University, Tianjin 300071, China;4. School of Electronics Information Engineering, Tianjin University of Technology, Tianjin 300384, China;1. DST/NRF Centre of Excellence in Strong Materials, School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg 2050, South Africa;2. Fraunhofer-Institute of Ceramic Technologies and Systems (IKTS), Dresden, Germany |
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| Abstract: | Dense SiC ceramic matrix composites containing SiC whiskers (SiCw) and MoSi2 phase (SiCw/MoSi2–SiC) are fabricated by a liquid Si infiltration (LSI) method. Pyrolyzed rice husks (RHs) containing SiC whiskers, particles and amorphous carbon are mixed with different amounts of Mo powder to form preforms for the infiltration. Microstructure and mechanical properties of the composites are studied. Fracture mode of the composites is discussed. Results show that the SiC whiskers and fine particles in the pyrolyzed RHs were preserved in the composites after the LSI process. The amorphous carbon and Mo powder in the preforms reacted with molten Si, forming SiC and MoSi2 in the composites. The presence of MoSi2 in the composite increases the elastic modulus but lowers the flexure strength. Content of MoSi2 of ca. 20 wt.% provides an enhanced fracture toughness of 4.1 MPa m1/2 for the composite. But too large amount of MoSi2 caused crack formation in the composite. The compressive residual stress introduced by the formation of MoSi2 and SiC, and the de-bonding of the fine SiC particles and SiC whiskers from the residual Si phase are considered to favor the fracture toughness of the composites. |
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