Mechanical, electrical and thermal properties of ZrC-ZrB2-SiC ternary eutectic composites prepared by arc melting
Mechanical, electrical and thermal properties of ZrC-ZrB2-SiC ternary eutectic composites prepared by arc melting
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DOI：
10.1016/j.jeurceramsoc.2018.04.028
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发表时间：
2018-09
影响因子：
5.7
通讯作者：
R. Tu;B. Xiao;Song Zhang;Z. Deng;Qizhong Li;Meijun Yang;T. Goto;Lianmeng Zhang;H. Ohmori
中科院分区：
文献类型：
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作者：
R. Tu;B. Xiao;Song Zhang;Z. Deng;Qizhong Li;Meijun Yang;T. Goto;Lianmeng Zhang;H. Ohmori
以ZrC、ZrB 2和SiC为原料，在Ar气氛下采用电弧熔炼法制备了ZrC-ZrB 2-SiC复合材料。首次确定了20 ZrC-30 ZrB_2 - 50 SiC（mol%）三元共晶成分。SiC长约7 μm，直径约500 nm，ZrC长约4 μm，直径约1 μm，呈棒状均匀分散在ZrB 2基体中。ZrC-ZrB 2-SiC复合材料的共晶温度约为2550 K。共晶复合材料的维氏硬度和断裂韧性分别为23 GPa和6.2 MPa m1/2。随着温度从287 K升高到800 K，电导率从7.2 × 107下降到1.75 × 106 S m− 1。随着温度从287 K升高到973 K，热导率从85 W K− 1 m − 1降低到61 W K− 1 m − 1。
ZrC-ZrB2-SiC composites were prepared by arc-melting in Ar atmosphere using ZrC, ZrB2and SiC as starting materials. The ternary eutectic composition of 20ZrC-30ZrB2-50SiC (mol%) was first identified. SiC about 7 μm in length and 500 nm in diameter, ZrC about 4 μm in length and 1 μm in diameter, in rod-like microstructure, were uniformly dispersed in ZrB2matrix of eutectic composite. The eutectic temperature of ZrC-ZrB2-SiC composite was approximately 2550 K. The Vickers Hardness and fracture toughness of eutectic composite was 23 GPa and 6.2 MPa m1/2, respectively. The electrical conductivity decreased from 7.2 × 107to 1.75 × 106S m−1with the temperature increasing from 287 to 800 K. The thermal conductivity decreased from 85 to 61 W K−1m−1with increasing temperature from 287 to 973 K.