Fabrication method and mechanical properties of biomimetic Cf/ZrB2-SiC ceramic composites with bouligand structures |
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| Affiliation: | 1. Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology, School of Mechanical Engineering, Hebei University of Technology, Tianjin, PR China;2. School of Artificial Intelligence, Hebei University of Technology, Tianjin 300401, PR China;1. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150080, China;3. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou 412008, China;1. School of Material Science and Engineering of Henan University of Technology, Lianhua road 100, 450001 Zhengzhou, Henan, China;2. Henan International Joint Laboratory of Nano-Photoelectric magnetic material of Henan University of Technology, China |
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| Abstract: | Herein, biomimetic Cf/ZrB2-SiC ceramic composites with bouligand structures are fabricated by combining precursor impregnation, coating, helical assembly and hot-pressing sintering. First, Cf/ZrB2-SiC ceramic films are achieved through a precursor impregnation method using polycarbosilane (PCS). Second, the PCS-Cf/ZrB2-SiC ceramic films are coated with ZrB2 and SiC ceramic layers. Finally, hot-pressing sintering is employed to densify helical assembly Cf/ceramic films with a fixed angle of 30°. The microstructures and carbon fiber content on the mechanical properties of biomimetic Cf/ZrB2-SiC ceramic composites are analyzed in detail. The results show that the coated ceramic layer on PCS-Cf/ZrB2-SiC films can heal the cracks formed by pyrolysis of PCS, and the mechanical properties are obviously improved. Meanwhile, the mechanical properties could be tuned by the contents of the carbon fiber. The toughening mechanisms of Cf/ZrB2-SiC ceramic composites with bouligand structures are mainly zigzag cracks, crack deflection, multiple cracks, carbon fiber pulling out and bridging. |
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| Keywords: | Bouligand structure Carbon fiber Mechanical properties |
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