Mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites
Mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites
复制标题
碳纤维布增强溶胶莫来石复合材料力学性能及热稳定性
DOI：
10.1007/s40145-018-0307-z
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发表时间：
2019-06
影响因子：
16.9
通讯作者：
Weiguo Mao
中科院分区：
文献类型：
--
作者：
Wei Zhang;Qingsong Ma;Kuanhong Zeng;Songlin Liang;Weiguo Mao
为了使莫来石陶瓷作为热防护材料得到广泛应用，提高其断裂韧性是十分必要的。本文以高固含量的Al 2 O3-SiO2溶胶为原料，通过溶胶浸渍和热处理工艺制备了碳纤维布预制体增强莫来石（C/莫来石）复合材料。C/莫来石复合材料的抗弯强度为228.9 MPa，与致密的整体莫来石相当，但总孔隙率达到13.4%。断裂韧性达11.2MPa·m1/2，是致密莫来石的4-5倍。在1200 °C以上，由于碳纤维与基体中残余SiO2之间的碳热还原作用，强度下降。在碳纤维表面沉积热解碳涂层作为界面涂层。热解碳涂层的牺牲明显减轻了碳纤维的化学损伤。因此，C/PyC/莫来石复合材料在1500 °C时强度保持不变，在1600 °C退火后强度保持率远高于C/莫来石复合材料。
For the wide application as thermal protection materials, it is very necessary for mullite ceramics to improve fracture toughness. In this paper, the laminated and stitched carbon fiber cloth preform reinforced mullite (C/mullite) composites were prepared through the route of sol impregnation and heat treatment using the Al2O3—SiO2sol with a high solid content as raw materials. The C/mullite composites showed a flexural strength of 228.9 MPa that was comparable to that of dense monolithic mullite although the total porosity reached 13.4%. Especially, a fracture toughness of 11.2 MPa·m1/2that was 4–5 times that of dense monolithic mullite was obtained. Strength deterioration due to the carbothermal reduction between carbon fiber and the residual SiO2in matrix was found above 1200 °C. A pyrolytic C (PyC) coating was deposited on carbon fibers as interfacial coating. The chemical damage to carbon fibers was obviously alleviated by the sacrifice of PyC coating. Accordingly, the C/PyC/mullite composites kept strength unchanged up to 1500 °C, and showed much higher strength retention ratio than C/mullite composites after annealing at 1600 °C.
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影响因子：
5.2
作者：
Yi Wang;Haifeng Cheng;Haitao Liu;Jun Wang
通讯作者：
Yi Wang;Haifeng Cheng;Haitao Liu;Jun Wang
DOI：
10.1016/s1003-6326(18)64869-1
发表时间：
2018-11
影响因子：
4.5
作者：
Wei Zhang;Wei Zhang;Q. Ma;Kewei Dai;Wei Mao
通讯作者：
Wei Zhang;Wei Zhang;Q. Ma;Kewei Dai;Wei Mao
影响因子：
16.9
作者：
Jinyong Zhang;Haijiao Zhan;Z. Fu;R. Todd
通讯作者：
Jinyong Zhang;Haijiao Zhan;Z. Fu;R. Todd
影响因子：
6.2
作者：
Borong Shan;Q. Ma;Kuanhong Zeng
通讯作者：
Borong Shan;Q. Ma;Kuanhong Zeng
影响因子：
5.7
作者：
E. Tkalčec;H. Ivanković;R. Nass;H. Schmidt
通讯作者：
E. Tkalčec;H. Ivanković;R. Nass;H. Schmidt