Effect of ZrB2 content on the densification,microstructure, and mechanical properties of ZrC-SiC ceramics |
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| Affiliation: | 1. Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Nijyuku, Katsushika-ku, Tokyo, 125-8585, Japan;2. Department of Advanced Interdisciplinary Studies, Graduate School of Engineering, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8904, Japan;3. Japan Aerospace Exploration Agency (JAXA), Structures and Advanced Composite Research Unit, 6-13-1 Ohsawa, Mitaka-shi, Tokyo, 181-0015, Japan;4. Department of Space Flight Systems, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, 252-0222, Japan;1. School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China;2. School of Natural Sciences and Humanities, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China;3. Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;4. University of Chinese Academy of Sciences, Beijing, China |
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| Abstract: | ZrC ceramics containing 30 vol% SiC-ZrB2 were produced by high-energy ball milling and reactive hot pressing. The effects of ZrB2 content on the densification, microstructure, and mechanical properties of ceramics were investigated. Fully dense ceramics were achieved as ZrB2 content increased to 10 and 15 vol%. The addition of ZrB2 suppressed grain growth and promoted dispersion of the SiC particles, resulting in fine and homogeneous microstructures. Vickers hardness increased from 23.0 ± 0.5 GPa to 23.9 ± 0.5 GPa and Young’s modulus increased from 430 ± 3 GPa to 455 ± 3 GPa as ZrB2 content increased from 0 to 15 vol%. The increases were attributed to a combination of the higher relative density of ceramics with higher ZrB2 content and the higher Young’s modulus and hardness of ZrB2 compared to ZrC. Indentation fracture toughness increased from 2.6 ± 0.2 MPa?m1/2 to 3.3 ± 0.1 MPa?m1/2 as ZrB2 content increased from 0 to 15 vol% due to the increase in crack deflection by the uniformly dispersed SiC particles. Compared to binary ZrC-SiC ceramics, ternary ZrC-SiC-ZrB2 ceramics with finer microstructure and higher relative densities were achieved by the addition of ZrB2 particles. |
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| Keywords: | Zirconium carbide-silicon carbide-zirconium diboride Reactive hot pressing Densification Microstructure Mechanical properties |
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