Selection principle of the synthetic route for fabrication of HfB2 and HfB2-SiC ceramics |
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| Authors: | Qi-Qi Zhu Yan Zhang Wei-Ming Guo Shi-Kuan Sun Hua-Tay Lin |
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| Affiliation: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, China;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK |
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| Abstract: | Densification, microstructure, and mechanical properties of spark plasma sintered HfB2 and HfB2-SiC ceramics using HfB2 powders from borothermal reduction and boro/carbothermal reduction were investigated and compared. It was found that HfB2ceramics obtained by boro/carbothermal reduction exhibited a significantly higher sinterability compared to that by borothermal reduction. Inversely, HfB2-SiC ceramics obtained by borothermal reduction exhibited a refined microstructure and better mechanical properties (Vickers hardness: 23.60 ± 2.43 GPa; fracture toughness: 5.89 ± 0.30 MPa.m1/2) than that by boro/carbothermal reduction. These results indicated that optimal fabrication of HfB2-based ceramics could be achieved by the selection of synthetic route of HfB2 powders. |
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| Keywords: | densification mechanical properties microstructure powders ultra-high temperature ceramics |
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