Gel-cast hierarchical porous B4C/C preform and its role in fabricating reaction bonded boron carbide composites |
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| Affiliation: | 1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Welding Production Technology National Key Laboratory, Harbin Institute of Technology, Harbin 150001, China;1. College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, PR China;2. Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, PR China;3. Chongqing Runlong Water Resource development CO.LTD, Chongqing 401329, PR China;1. CEA Saclay, DEN, DANS, DMN, SRMA, LA2M, Université Paris-Saclay, 91191, Gif/Yvette, France;2. CEA Saclay, DEN, DANS, DMN, SRMP, Laboratoire JANNUS, Université Paris-Saclay, 91191, Gif/Yvette, France;3. CNRS/IN2P3/IPNL, 69622, Villeurbanne, France;1. Hopkins Extreme Materials Institute, The Johns Hopkins University, Baltimore, MD 21218, USA;2. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA;1. Center of Functional Nano-Ceramics, National University of Science and Technology MISiS, Moscow 119049, Russia;2. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA |
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| Abstract: | The resorcinol-formaldehyde (RF) gel-casting system is employed for the first time to fabricate a hierarchical porous B4C/C preform, which was subsequently used for the fabrication of reaction bonded boron carbide (RBBC) composites via a liquid silicon infiltration process. The effect of the carbon content and carbon structures of this perform on the microstructures and mechanical properties of B4C/C preform and the resultant RBBC composites is reported. The B4C/C preform (16 wt% carbon) exhibit a strength of 34±1 MPa. The obtained RBBC composites shown uniform microstructure is consisted of SiC particles bonded boron carbide scaffold and an interpenetrating residual silicon phase. The Vickers hardness, flexural strength and fracture toughness of the RBBC composites (16 wt% carbon) are 24 GPa, 452 MPa and 4.32 MPa m1/2, respectively. |
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| Keywords: | Gel-casting Liquid silicon infiltration Boron carbide Mechanical properties |
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