Simple and facile fabrication of lightweight, strong, thermal insulating ceramifiable aerogel-like polysiloxane impregnated carbon/carbon composite with high antioxidant ablation performance

被引:0
作者
Zhang, Jie [1 ]
Yun, Qingwen [2 ]
Yin, Rongying [2 ]
Du, Yebo [1 ]
Cheng, Haiming [1 ]
Bu, Lingze [1 ]
Hong, Changqing [3 ]
Zhang, Xinghong [3 ]
机构
[1] Harbin Univ Sci & Technol, Dept Engn Mech, Harbin 150080, Peoples R China
[2] Harbin Aircraft Ind Grp Co Ltd, Aviat Ind Corp China, Harbin, Peoples R China
[3] Harbin Inst Technol, Natl Key Lab Sci & Technol Adv Composites Special, Harbin, Peoples R China
基金
中国国家自然科学基金;
关键词
aerogels; composites; high temperature materials; sol-gel process; thermal insulation; PROTECTION SYSTEMS; FIBER COMPOSITES; SPACE-VEHICLES; CARBON; RESISTANCE; TECHNOLOGY; STABILITY; GRAPHENE; FUTURE;
D O I
10.1002/pc.29713
中图分类号
TB33 [复合材料];
学科分类号
摘要
Lightweight ablative thermal protection materials (TPMs) with excellent ablation, thermal insulation, and anti-oxidation are urgently needed for aerospace vehicles. Herein, a distinct strategy was proposed that uses aerogel-like polysiloxane (SiA) as a matrix, and carbon-bonded carbon fiber (C/C) composite as reinforcement to construct a lightweight SiA impregnated C/C (C/C-SiA) composite, through vacuum impregnation, sol-gel, and atmospheric pressure drying. The intriguing characteristics including high mechanical strength and stiffness, thermal stability and oxidation resistance, and a low thermal conductivity of 0.063 W/(mK) were integrated into the low-density (0.238-0.306 g/cm(3)) C/C-SiA. The synergistic effect originated from pyrolysis products of SiA including silicon oxycarbide ceramic to inhibit oxygen diffusion and pyrolysis gas to retard convective heat transfer, the high emissivity surface re-radiation to dissipate heat and transverse thermal conductivity to regulate heat transfer by C/C, enables C/C-SiA to deliver remarkable thermal insulation performance (20 mm backside temperature below 40 degrees C on a heating plate for 1800 sec) and ablation resistance (near-zero surface recession of 0.18 mu m/s exposed to 1300 degrees C flame for 1200 sec). The ceramifiable strategy can be extended to other preceramic polymers, such as polycarbosilane, polysilazane, and ZrO2 precursor, which may open a new avenue for improving lightweight ablative TPMs.
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页数:12
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