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Fabrication of dense B4C-preceramic polymer derived SiC composite
Affiliation:1. Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA;2. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA;3. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;1. Institut de Recherche sur les Céramiques, UMR 7315, 12 rue Atlantis, 87068 Limoges Cedex, France;2. Centre National d’Etudes Spatiales, Direction des Lanceurs, 52 rue Jacques Hillairet, 75615 Paris Cedex, France;3. CIRIMAT, Université de Toulouse, CNRS, Université Toulouse 3 Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 9, France;1. Department of Materials & Manufacturing Process, Malek-Ashtar University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, University of Canterbury, Christchurch, 8140, New Zealand;1. V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine, 2 Avtozavodskaya St., Kyiv, 04074, Ukraine;2. Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ, 08854, USA;3. Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA;4. Institute of Semiconductor Physics of the National Academy of Sciences of Ukraine (NASU), 41 Nauky Ave., Kyiv, 03028, Ukraine;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, PR China;2. National Key Laboratory of Science and Technology on Material under Shock and Impact, Beijing, 100081, China;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, PR China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, PR China
Abstract:B4C-SiC composites were fabricated via the preceramic polymer (PCP) route combined with pressure-assisted sintering. Fully dense bodies were achieved by controlling surface oxide on B4C powder and pyrolysis conditions for PCP coated powder. We elucidate i) the microstructure and phase developments observed in the process of fabricating dense B4C-PCP derived SiC composites and ii) the mechanical properties and crack deflection behavior of dense bodies. The incorporation of PCP derived SiC to B4C decreases hardness due to the lower hardness value of SiC compared to B4C and the residual carbon accompanied by SiC formation. Instead, the PCP derived SiC improved indentation fracture toughness. The main toughening mechanism supposed is a combination of crack impeding by SiC grains and crack deflection within SiC grains, likely due to the presence of subgrains or layered microstructure in the PCP derived SiC grains.
Keywords:Preceramic polymer  Sintering  Pyrolysis  Surface oxide  Toughening mechanism
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