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

作     者：Wei ZHANG Qingsong MA Kuanhong ZENG Songlin LIANG Weiguo MAO 

作者机构：School of Materials Science and EngineeringXiangtan UniversityXiangtan 411105HunanChina Science and Technology on Advanced Ceramic Fibers&Composites LaboratoryNational University of Defense TechnologyChangsha 410073China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2019年第8卷第2期

页      面：218-227页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

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) 

主　　题：carbon fiber reinforced mullite composite sol mechanical property thermal stability 

摘      要：For the wide application as thermal protection materials,it is very necessary for mullite ceramics to improve fracture *** 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 *** 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 *** 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 *** chemical damage to carbon fibers was obviously alleviated by the sacrifice of PyC ***,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℃.