Effects of high-temperature annealing on the microstructure and properties of C/ZrC composites prepared by reactive melt infiltration

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• 作者：Si'an Chen^a ; Hongliang Ji^b ; Yong Li^a ; Guangde Li^c ; Min Mei^d ; Haifeng Hu^a ; ^{hfhu_nudt@nudt.edu.cn}
• 关键词：C/ZrC composites ; Reactive melt infiltration ; High-temperature annealing ; Mechanical properties ; Microstructure ; Ablation resistance
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：16 February 2017
• 年：2017
• 卷：686
• 期：Complete
• 页码：41-45
• 全文大小：1483 K
• 卷排序：686

文摘

C/ZrC composites prepared by reactive melt infiltration at 1900 °C contained ~4.2 vol% residual α-Zr which was harmful to the high-temperature mechanical properties and ablation resistance. Thus, the composites were heat-treated for 1 h from 1200 °C to 2000 °C. The residual α-Zr amount was only 0.6 vol% after annealing at 2000 °C, indicating that high temperature promoted the diffusion and reaction of Zr and C to consume α-Zr. C/ZrC composites had the optimum flexural properties of 192 MPa and 17.7 GPa after annealing at 1600 °C. The ablation resistance was improved after high-temperature annealing, and the mass loss rate and linear recession rate decreased as the temperature increased, which were 0.0021 g/s and 0.0008 mm/s respectively after annealing at 2000 °C.