Properties of ZrB2–SiC Ceramics by Pressureless Sintering |
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| Authors: | Hui Zhang Yongjie Yan Zhengren Huang Xuejian Liu Dongliang Jiang |
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| Affiliation: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
Graduate School of the Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | Pressureless sintering was used to densify ZrB2–SiC ultra-high temperature ceramics. The physical, mechanical, thermal, electrical, and high temperature properties were investigated. This comprehensive set of properties was measured for ZrB2 containing 20 vol% SiC in which B4C and C were used as the sintering aids. The three-point flexural strength was 361±44 MPa and the elastic modulus was 374±25 GPa. The Vickers hardness and fracture toughness were 14.7±0.2 GPa and 4.0±0.5 MPa·m1/2 respectively. Scanning electron microscopy studies of the microstructure of ZrB2–SiC showed that SiC particles were distributed homogenously in the ZrB2 matrix with little residual porosity. |
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