Mechanical and tribological properties of SiC whisker-reinforced SiC composites via oscillatory pressure sintering |
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Authors: | Yifan Yang Tianbin Zhu Nanjie Sun Xiong Liang Yawei Li Heng Wang Zhipeng Xie Shaobai Sang Jinning Dai |
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Affiliation: | 1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China;2. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, China;3. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;4. Zhuzhou Wanrong New Materials Technology Co. Ltd., Zhuzhou, China |
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Abstract: | SiC whisker (SiCw)-reinforced SiC composites were prepared by an oscillatory pressure sintering (OPS) process, and the effects of SiCw content on the microstructure and mechanical and tribological properties of such composites were investigated. The addition of SiCw could promote the formation of long columnar α-SiC, and the aspect ratio of α-SiC grains first increased and then decreased with the increase of SiCw content. When the SiCw content was 5.42 wt%, the relative density of the SiC–SiCw composite reached up to 99.45%. The SiC–5.42 wt% SiCw composite possessed the highest Vickers hardness, fracture toughness, and flexural strength of 30.68 GPa, 6.66 MPa·m1/2, and 733 MPa, respectively. In addition, the SiC–5.42 wt% SiCw composite exhibited the excellent wear resistance when rubbed with GCr15 steel balls, with a friction coefficient of .76 and a wear rate of 4.12 × 10−7 mm3·N−1·m−1. This could be ascribed to the improved mechanical properties of SiC–SiCw composites, which enhanced the ability to resist peeling and micro-cutting, thereby enhancing the tribological properties of the composites. |
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Keywords: | mechanical properties oscillatory pressure sintering SiC tribological properties |
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