Effects of porous C/C density on the densification behavior and ablation property of C/C-ZrC-SiC composites
Effects of porous C/C density on the densification behavior and ablation property of C/C-ZrC-SiC composites
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DOI：
10.1016/j.carbon.2013.01.059
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发表时间：
2013-06-01
期刊：
影响因子：
10.9
通讯作者：
Guo Ling-jun
中科院分区：
文献类型：
--
作者：
Li, Ke-zhi;Jing, Xie;Guo Ling-jun
以有机含锆聚合物与聚碳硅烷的混合溶液为前驱体，采用前驱体浸润热解法制备了C/C- zrc - sic复合材料。以密度分别为0.92、1.21和1.40 g/cm(3)的多孔碳/碳（C/C）复合材料为预成形体，研究了多孔C/C密度对C/C- zrc - sic复合材料致密化性能和抗烧蚀性能的影响。结果表明：低密度C/C预制体增重快，制备的C/C- zrc - sic复合材料具有较高的堆积密度和开孔率；由密度为1.21 g/cm(3)的C/C预制体制备的复合材料在烧蚀过程中表面温度超过2400℃，具有较好的抗烧蚀性能。烧蚀120 s后，复合材料的线性烧蚀速率和质量烧蚀速率分别低至1.02 × 10(-3) mm/s和-4.01 × 10(-4) g/s，熔融ZrO2固溶体形成致密连续的涂层是其具有良好的抗烧蚀性能的原因。(C) 2013 Elsevier Ltd.版权所有。
C/C-ZrC-SiC composites were prepared by precursor infiltration and pyrolysis process using a mixture solution of organic zirconium-containing polymer and polycarbosilane as precursors. Porous carbon/carbon (C/C) composites with density of 0.92, 1.21 and 1.40 g/cm(3) were used as preforms, and the effects of porous C/C density on the densification behavior and ablation resistance of C/C-ZrC-SiC composites were investigated. The results show that the C/C preforms with a lower density have a faster weight gain, and the obtained C/C-ZrC-SiC composites own higher bulk density and open porosity. The composites fabricated from the C/C preforms with a density of 1.21 g/cm(3) exhibit better ablation resistance with a surface temperature of over 2400 degrees C during ablation. After ablation for 120 s, the linear and mass ablation rates of the composites are as low as 1.02 x 10(-3) mm/s and -4.01 x 10(-4) g/s, respectively, and the formation of a dense and continuous coating of molten ZrO2 solid solution is the reason for their great ablation resistance. (C) 2013 Elsevier Ltd. All rights reserved.