Reactive hot pressing of SiC-ZrC composites at low temperature

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• 作者：Kun Wang^a ; ^b ; Youfu Zhou^a ; ^{yfzhou@fjirsm.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Wentao Xu^a ; Ming Xiang^a ; Xiaoqiang Li^a ; Zhiguang Wang^c
• 关键词：Ceramic ; Composites ; Reactive hot pressing ; Mechanical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：849-854
• 全文大小：2430 K

文摘

SiC-ZrC composites with relative density in excess of 99% were prepared by reactive hot pressing (RHP) of SiC and ZrH₂ at 1800 °C for 1 h. The reaction between SiC and ZrH₂ resulted in the formation of ZrC_1-x. The formation process and densification behavior during RHP process were investigated. Low temperature densification of SiC-ZrC composites is attributed to the formed nonstoichiometric ZrC_1-x and the removal of SiO₂ impurity on the surface of SiC particles. As reinforced phase, ZrC_1-x has inhibiting effect on the abnormal grain growth of SiC, resulting in homogeneous microstructure of fine SiC grains. Adding 10 wt% ZrH₂ to SiC, the formed SiC-4.62 vol% ZrC composite exhibited better mechanical properties (Vickers hardness of 27.6 ± 0.7 GPa, flexure strength of 448 ± 38 MPa, fracture toughness of 6.0± 0.3 MPa·m^1/2, respectively) than monolithic SiC ceramic.