Interface engineering of fiber-reinforced all-oxide composites fabricated by the sol–gel method with fugitive pyrolytic carbon coatings |
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| Affiliation: | 1. State Nuclear Power Research Institute, Beijing 102209, China;2. Division of Functional Materials and Nanodevices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. Department of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;1. State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China;2. AML, Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China;3. Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150001, PR China;4. Department of Mechanical Engineering, University of New Orleans, LA 70148, USA |
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| Abstract: | This paper describes the interface engineering of three–dimensional (3D) Nextel?440 fiber-reinforced aluminosilicate composites fabricated by the sol–gel method with fugitive pyrolytic carbon (PyC) coatings. The coating thickness on the fiber strength, interfacial characteristics and there corresponding effects on mechanical properties of the composites were investigated. The study shows that the fiber strength was influenced by the coating thickness and optimized with the thickness of 0.15 μm. The composites with uncoated fibers showed brittle fracture behavior without fiber pullout because of strong interactions between the fiber and the matrix. However, higher strengths and pseudo-ductile fracture behaviors were obtained in the composites with PyC interphases, where different deflections and branches of propagating cracks and fiber pullout patterns were observed. Moreover, induced fugitive PyC interface conditions have great effects on the density, microstructure and mechanical properties of the resultant composites. |
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| Keywords: | A Ceramic–matrix composites (CMCs) B Interphase D Mechanical testing Sol–gel method |
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