Improved mechanical properties of reaction-bonded SiC through in-situ formation of Ti3SiC2 |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China;2. Foshan Ceramics Research Institute Group Co., Ltd, Foshan, 528000, China;1. School of Materials Science and Engineering, Shenyang Ligong University, Shenyang, 110159, China;2. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China;3. Equipment Engineering School, Shenyang Ligong University, Shenyang, 110159, China;1. Key Laboratory of Advanced Structural Materials, Ministry of Education, and School of Materials Science and Engineering, Changchun University of Technology, Changchun, 130012, China;2. Changchun New Industries Optoelectronics Tech. Co., Ltd, Changchun, 130103, China;3. State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering Co., LTD, Zhengzhou, 450001, China;1. Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, 572000, China;2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, China;3. Hainan Deep-Sea Technology Innovation Center, Sanya, 572000, China;1. Department of Applied Science and Technology (DISAT) Politecnico di Torino, Torino, Italy;2. National Research Council – Institute of Condensed Matter Chemistry and Technologies for Energy (CNR-ICMATE), Genova, Italy |
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| Abstract: | Reaction-bonded SiC is a ceramic with excellent thermal properties, good corrosion resistance and the characteristic of near-net-shape manufacturing. However, the poor fracture toughness of free Si limits the applications of reaction-bonded SiC. In this study, TiC was added to reaction-bonded SiC and reacted with free Si to form Ti3SiC2. The effects of TiC and carbon black on the mechanical properties of reaction-bonded SiC were investigated. The results demonstrated that the in-situ formation of Ti3SiC2 and decrease in the content and size of free Si improved the mechanical properties of reaction-bonded SiC ceramics. The mechanical properties of TiC-added reaction-bonded SiC with 17.5 wt% carbon black were superior to those of TiC-added reaction-bonded SiC with 15 wt% carbon black. Moreover, increasing the TiC content of reaction-bonded SiC with 17.5 wt% carbon black from 0 to 7.5 wt% caused an increase in its bending strength from 183.92 to 424.43 MPa and an increase in fracture toughness from 3.7 to 5.24 MPa m1/2. |
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| Keywords: | Reaction-bonded SiC Carbon black Fracture toughness Bending strength |
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