Mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites

论文摘要

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-SiO2 sol 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 SiO2 in matrix was found above 1200℃.A pyrolytic C（Py C）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℃,and showed much higher strength retention ratio than C/mullite composites after annealing at 1600℃.

论文目录

• 1 Introduction
• 2 Experimental
• 3 Results and discussion
•   3.1 Fabrication and mechanical behavior of C/mullite composites
•   3.2 Thermal stability of C/mullite composites
• 4 Conclusions

文章来源

类型: 期刊论文

作者: Wei ZHANG,Qingsong MA,Kuanhong ZENG,Songlin LIANG,Weiguo MAO

来源: Journal of Advanced Ceramics 2019年02期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 材料科学

单位: School of Materials Science and Engineering, Xiangtan University,Science and Technology on Advanced Ceramic Fibers & Composites Laboratory,National University of Defense Technology

基金: supported by the Open Foundation of Science and Technology on Thermostructural Composite Materials Laboratory (Grant No. 614291102010117),the Science Innovation Foundation of Shanghai Academy of Spaceflight Technology (Grant No. SAST2015043),the National Natural Science Foundation of China (Grant No. 11572277)

分类号: TB332

页码: 218-227

总页数: 10

文件大小: 564K

下载量: 10