Processing and characterization of C_f/SiC composites

作     者：Xinbo He Bin Ye Xuanhui Qu Changrui Zhang Xingui Zhou 

作者机构：State Key Laboratory for Advanced Metals and Materials Materials Science and Engineering School University of Science and Technology Beijing Beijing100083 China School of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2005年第12卷第5期

页      面：460-463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：This research was financially supported by the National Natural Science Foundation of China (No. 50404012) 

主　　题：Cf/SiC composites fabrication methods mechanical properties 

摘      要：Carbon fiber-reinforced SiC composites were prepared by precursor pyrolysis-hot pressing （PP-HP） and precursor impregnation-pyrolysis （PIP）, respectively. The effect of fabrication methods on the microstructure and mechanical properties of the composites was investigated. It was found that the composite prepared by PP-HP exhibits a brittle fracture behavior, which is mainly ascribed to a strongly bonded fiber/matrix interface and the degradation of the fibers caused by a higher processing temperature. On the contrary, the composite prepared by PIP shows a tough fracture behavior, which could be rationalized on the basis of a weakly bonded fiber/matrix interface as well as a higher strength retention of the fibers. As a result, in comparison with the composite prepared by PP-HP, the composite prepared by PIP achieves better mechanical properties with a flexural strength of 573.4 MPa and a fracture toughness of 17.2 MPa.m^1/2.