Effects of in-situ carbon layer and volume fraction of SiC fiber on the mechanical properties and fracture behaviors of SiCf/SiC composites fabricated by a modified PIP method |
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| Affiliation: | 1. Depto. de Física de la Materia Condensada, ICMS, CSIC-Universidad de Sevilla, Apdo. 1065, Sevilla 41080, Spain;2. Instituto de Ciencia de Materiales de Sevilla, ICMS, CSIC-Universidad de Sevilla, Avda. Américo Vespucio 49, Sevilla 41092, Spain;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China;2. School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;1. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China;2. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;3. Southwest Technology and Engineering Research Institute, No. 115 Fenglin Road, Jinfeng Town, Jiulongpo District, Chongqing 401329, China;4. Yantai Research Institute of Harbin Engineering University, No. 1 Qingdao Street, Yantai Economic & Technological Development Area, Shandong, PR China;5. Institute of Aero Engine Research, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;1. Ural Federal University, Mira str.., Yekaterinburg, Russia;2. Institute of Solid State Chemistry of Ural Branch of Academy Science, 91 Pervomayskaya str., Yekaterinburg, Russia;1. State Key Laboratory of High-Performance Ceramics & Super?ne Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Unidirectional SiCf/SiC composites (UD SiCf/SiC composites) with excellent mechanical properties were successfully fabricated by a modified PIP method which involved the preparation of film-like matrix containing carbon layer with a low concentration PCS solution followed by the rapid densification of composites with a high concentration PCS solution. Carbon layers were in-situ formed and alternating with SiC layers in the as-received matrix. The unique microstructure endows the composites with appropriate interfacial bonding state, good load transfer ability of interphase and matrix and load bearing ability of fiber, and great crack deflection capacity, which ensures the synergy of high strength and toughness of composites. It is also found that the fiber volume fraction in the preform makes a non-negligible effect on the distribution of interphase and matrix, of which the reasonable adjustment can be utilized to optimize the mechanical properties of composites. Compared with the composites only using high concentration PCS solution, the UD SiCf/SiC composites prepared by the modified PIP method exhibit superior mechanical properties. Ultrahigh flexural strength of 1318.5 ± 158.3 MPa and fracture toughness of 47.6 ± 5.6 MPa·m1/2 were achieved at the fiber volume fraction of 30%. |
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| Keywords: | PIP Carbon layer Layered matrix Mechanical properties |
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