Dopant effects on high temperature mechanical properties of zirconium carbide ceramics
Dopant effects on high temperature mechanical properties of zirconium carbide ceramics
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DOI：
10.1179/1743676115y.0000000001
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发表时间：
2015-05
影响因子：
2.2
通讯作者：
Jian. Zhao;J. Zou;Z. Man;Xin‐Gang Wang;Jiaxiang Xue;Guojie Zhang
中科院分区：
文献类型：
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作者：
Jian. Zhao;J. Zou;Z. Man;Xin‐Gang Wang;Jiaxiang Xue;Guojie Zhang
结合理论和实验方法，研究了5体积%的影响研究了WC掺杂对ZrC陶瓷显微结构、烧结行为和力学性能的影响。WC掺杂提高了ZrC陶瓷的高温弹性模量和抗弯强度。计算和实验结果均表明，（Zr，W）C固溶体的形成促进了起始粉末中杂质氧向晶格中的溶解，从而减少了晶界氧缺陷。内耗曲线也表明，WC掺杂的ZrC陶瓷具有更清洁的晶界，从而提高了WC掺杂ZrC陶瓷的高温弹性模量和弯曲强度。
Combining theoretical and experimental methods, the effects of 5 vol.-% WC dopant on the microstructure evolution, sintering behaviour and mechanical properties of ZrC ceramics were investigated. WC dopant was found to improve the high temperature elastic modulus and bending strength of ZrC ceramics. Both calculations and experimental results showed that the formation of (Zr, W)C solid solution promote dissolution of the impurity oxygen from the starting powder into the lattice sites, resulting in less oxygen defects in grain boundaries. Internal friction curve can also conform that the ZrC ceramics doped with WC have cleaner grain boundaries, which improved higher elastic modulus and bending strength in WC doped ZrC ceramics at elevated temperature.