Thermal shock resistance of continuous carbon fiber reinforced ZrC based ultra-high temperature ceramic composites prepared via Zr-Si alloyed melt infiltration
Thermal shock resistance of continuous carbon fiber reinforced ZrC based ultra-high temperature ceramic composites prepared via Zr-Si alloyed melt infiltration
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DOI：
10.1016/j.msea.2018.08.036
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Y. Tong;Wentao Zhu;S. Bai;Yongle Hu;Xin Xie;Yang Li
中科院分区：
文献类型：
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作者：
Y. Tong;Wentao Zhu;S. Bai;Yongle Hu;Xin Xie;Yang Li
采用自行研制的可控气氛下快速升温-降温装置，对连续碳纤维增强ZrC基超高温陶瓷基复合材料（C/C-ZrC）从超高温（特别是> 1500 °C）到室温的抗热震性能进行了研究。测试了不同热震循环次数和温度下复合材料的剩余强度和质量变化，以表征其抗热震性能。复合材料的弯曲强度在1300 °C以下开始略有下降，但失重不明显，在1300-1900 °C时下降幅度较大，在1900 °C以上急剧下降，失重明显增加。对热冲击试样的微观结构进行了分析，以揭示热冲击损伤。基体开裂、界面脱粘和基体孔隙是复合材料在不同循环次数和温度下热冲击后强度下降的主要原因。
Thermal shock resistance of continuous carbon fiber reinforced ZrC based ultra-high temperature ceramic matrix composite (C/C-ZrC) from ultra high temperatures (particularly > 1500 °C) to the room temperature was evaluated using a novel self-developed equipment with high heating-cooling rates in controllable atmosphere. Residual strength and mass variation of the as-prepared composite under different thermal shock cycles and temperatures were tested to characterize the thermal shock resistance. Flexural strength of the composite slightly decreases initially without obvious weight loss below 1300 °C, while it decreases by relatively high values at 1300–1900 °C and then sharply decreases over 1900 °C with obvious increase of weight loss. Microstructure of the thermally shocked specimens was examined to reveal the thermal shock damage. Matrix cracking, interfacial debonding and matrix pores were clearly observed, which were the main reasons for the strength degradation of the composite thermally shocked for different cycles and temperatures.