Mechanical behavior of SiCf/SiC composites with alternating PyC/SiC multilayer interphases |
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Affiliation: | 1. College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, PR China;2. Advanced Composites Center for Innovation and Science (ACCIS), Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, UK;3. Beijing Aeronautical Technology Research Center, Beijing 100076, PR China;1. Nuclear Research and Consultancy Group (NRG), Westerduinweg 3, 1755 LE Petten, The Netherlands;2. European Fusion Development Agreement (EFDA), Garching, Germany |
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Abstract: | In order to tailor the fiber–matrix interface of continuous silicon carbide fiber reinforced silicon carbide (SiCf/SiC) composites for improved fracture toughness, alternating pyrolytic carbon/silicon carbide (PyC/SiC) multilayer coatings were applied to the KD-I SiC fibers using chemical vapor deposition (CVD) method. Three dimensional (3D) KD-I SiCf/SiC composites reinforced by these coated fibers were fabricated using a precursor infiltration and pyrolysis (PIP) process. The interfacial characteristics were determined by the fiber push-out test and microstructural examination using scanning electron microscopy (SEM). The effect of interface coatings on composite mechanical properties was evaluated by single-edge notched beam (SENB) test and three-point bending test. The results indicate that the PyC/SiC multilayer coatings led to an optimum interfacial bonding between fibers and matrix and greatly improved the fracture toughness of the composites. |
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