Comparative insights into C/C-ZrC-SiC composites with different substrate carbon on microstructures, mechanical properties, and ablation behaviors
Comparative insights into C/C-ZrC-SiC composites with different substrate carbon on microstructures, mechanical properties, and ablation behaviors
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DOI：
10.1016/j.jmrt.2021.06.089
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发表时间：
2021-07-14
影响因子：
6.4
通讯作者：
Li, Jiaming
中科院分区：
文献类型：
--
作者：
Peng, Zheng;Sun, Wei;Li, Jiaming
系统研究了反应熔渗法制备的碳纤维增强碳和ZRC-SiC陶瓷基复合材料的组织、力学性能和烧蚀行为，并用不同的基碳：树脂碳(RDC)和热解碳(PYC)进行了致密化比较。结果表明，原始碳纤维增强碳(C/C)中陶瓷相的分布主要是由不同位置和大小的气孔致密化过程决定的。另外，不同碳基的C/C-ZrC-SiC样品具有不同的力学性能。C/PYC-ZRC-SiC复合材料的弯曲强度显著提高，表现出韧性断裂行为，这与C/RDC-ZRC-SiC复合材料的脆性断裂模型不同。然而，在2500℃的氧乙炔烧蚀炬下烧蚀30-240℃的S后，C/RDC-ZrC-SiC复合材料表现出更好的耐烧蚀性能，这是因为在单位体积内C/RDC-ZrC-SiC复合材料中含有更多的碳基质和碳化物块体，并且C/RDC-ZrC-SiC结构在烧蚀过程中气孔愈合时间较短。换句话说，可以在相对较短的时间内在烧蚀表面上形成完整的氧化膜。因此，这种良好的烧蚀性能在很大程度上可以归因于在烧蚀过程中形成了致密的含有熔融状二氧化硅的氧化物，它能够有效地抵抗冲刷并迅速封闭气孔。(C)2021年提交人。爱思唯尔出版公司B.V.T.
The microstructures, mechanical properties, and ablation behaviors of carbon-fiber reinforced carbon and ZrC-SiC ceramic matrix composites (C/C-ZrC-SiC) fabricated through reactive melt infiltration were systematically researched, of which preforms were densified using different substrate carbon: (i) resin carbon (RdC) and (ii) pyrolitic carbon (PyC) for comparison. The results showed that the densification process with pores that differ in location and size dominated the distribution of ceramic phases within pristine carbon-fiber reinforced carbon (C/C). In addition, the C/C-ZrC-SiC samples with different carbon substrates possessed different mechanical properties. The flexural strength of the C/PyC-ZrC-SiC composites was significantly higher, exhibiting a ductile fracture behavior, which is different from that of the brittle fracture model in C/RdC-ZrC-SiC composites. However, after being exposed to an oxyacetylene ablation torch at 2500 degrees C for 30-240 s, the C/RdC-ZrC-SiC composites exhibited better ablation resistances because there were more carbon matrix and carbide blocks per unit volume in the composites, and the structure of C/RdC-ZrC-SiC possessed a shorter healing time for pores during ablation. In other words, an integrated oxide scale on the ablated surface can be formed in a relatively shorter time. Therefore, the superior ablation behavior can largely be ascribed to the formation of dense oxides containing molten-like SiO2, which could effectively resist scouring and seal the pores promptly during ablation. (C) 2021 The Authors. Published by Elsevier B.V. T