Reactive Hot Pressing of ZrC–SiC Ceramics at Low Temperature |
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Authors: | Xin‐Gang Wang Jia‐Xiang Xue Yun Tang Xiao Huang Chang‐Ming Xu Pei‐Ling Wang |
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Affiliation: | State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, , Shanghai, 200050 China |
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Abstract: | Composites of ZrC–SiC with relative densities in excess of 98% were prepared by reactive hot pressing of ZrC and Si at temperature as low as 1600°C. The reaction between ZrC and Si resulted in the formation of ZrC1?x, SiC, and ZrSi. Low‐temperature densification of ZrC?SiC ceramics is attributed to the formed nonstoichiometric ZrC1?x and Zr–Si liquid phase. Adding 5 wt% Si to ZrC, the three‐point bending strength of formed ZrC0.8–13.4 vol%SiC ceramics reached 819 ± 102 MPa with hardness and toughness being 20.5 GPa and 3.3 MPa·m1/2, respectively. |
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