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Strength degradation of SiC fibers with a porous ZrB2-SiC coating: Role of the coating porous structure
Affiliation:1. School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;3. Gas Turbine Research Institute, Shanghai Jiao Tong University, Shanghai, 200240, China;4. School of Materials, University of Manchester, MSS Tower, Manchester, M13 9PL, UK;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;3. Technische Universität Darmstadt, Institut für Materialwissenschaft, Otto-Berndt-Str. 3, D-64287, Darmstadt, Germany;1. University of Oxford, Department of Materials, Parks Road, Oxford, OX1 3PH, UK;2. General Atomics, P.O. Box 85608, San Diego, CA, 92186-5608, USA;3. UK Atomic Energy Authority, Culham Science Centre, Abingdon, OX14 3DB, UK;1. Shenzhen Key Laboratory for Advanced Materials and Department of Material Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology, University Town, Shenzhen, Guangdong, 518055, China;2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, Hunan, 410073, China
Abstract:ZrB2-SiC coatings with varied porous structures were deposited on SiC fiber tows using the sol-gel method and cured at 1400 ℃ in vacuum. Tensile strength of the coated SiC fibers were much lower than that of the uncoated fibers. The bimodal distribution in the Weibull plot of the coated SiC fibers demonstrated that the fracture of the coated fiber can be attributed to two types of defects: the porous structure of the coating and the fiber defects. Detailed morphology and microstructure characterization of the coating and fiber combined with strength calculation were carried out to investigate the individual contribution of the fiber defects and the porous coating layer respectively. The results revealed that apart from the fiber damage during the coating process the porous structure of the fiber coating has a non-negligible effect on the fiber strength, presumably due to a relatively strong bonding between the fiber and coating.
Keywords:SiC fiber  Porous  Tensile strength  Sol-gel
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