Fabrication of carbon-coated boron carbide particle and its role in the reaction bonding of boron carbide by silicon infiltration |
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| Affiliation: | 1. Key Laboratory for Anisotropy and Texture of Materials (MOE), Northeastern University, Shenyang, Liaoning, 110004, China;2. Department of Materials Science and Engineering, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning, 110004, China;1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravska cesta 9, 845 36, Bratislava, Slovakia;2. NPU-SAS Joint Research Center, School of Materials Science, Northwestern Polytechnical University, Xi’an, 710072, Shaanxi, China;3. Notre Dame Integrated Imaging Facility, University of Notre Dame, Notre Dame, IN, 46556, United States;4. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, United States;1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;2. Institute of Advanced Ceramics, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;2. College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, China;3. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China |
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| Abstract: | To tackle the dissolution problem of boron carbide particles in silicon infiltration process, carbon-coated boron carbide particles were fabricated for the preparation of the reaction-bonded boron carbide composites. The carbon coating can effectively protect the boron carbide from reacting with liquid Si and their dissolution, thus maintaining the irregular shape of boron carbide particles and preventing the growth of boron carbide particles and reaction formed SiC regions. Furthermore, the nano-SiC particles, originated from the reaction of the carbon coating and the infiltrated Si, uniformly coated on the surfaces of boron carbide particles, thus forming a ceramic skeleton of the nano-SiC particles-coated and -bonded boron carbide particles. The Vickers hardness, flexural strength and fracture toughness of the composites can be increased by 26 %, 45 %, and 37 % respectively, by using carbon-coated boron carbide particles as raw materials. |
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| Keywords: | Reaction-bonded boron carbide Silicon infiltration Carbon-coated boron carbide particles Microstructure Mechanical properties |
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