Effect of SiC content on the mechanical behaviour of a three-dimensional needled C/SiC composite

作     者：Yin, Dezheng Deng, Yangfang Ma, Yuzhao Fan, Xiaomeng 

作者机构：Beijing Inst Space Long March Vehicle Beijing 100076 Peoples R China AECC Sichuan Gas Turbine Estab Chengdu 610500 Sichuan Peoples R China Xian Univ Architecture & Technol Coll Mat Sci & Engn Xian 710055 Shaanxi Peoples R China Northwestern Polytech Univ Sci & Technol Thermostruct Composite Mat Lab Xian 710072 Shaanxi Peoples R China 

出 版 物：《CERAMICS INTERNATIONAL》 (国际陶瓷)

年 卷 期：2021年第47卷第17期

页      面：25067-25073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：National Natural Science Foundation of China [52072303  51821091] 

主　　题：Three-dimensional needled preform C SiC Strength and toughness Matrix densification 

摘      要：In this study, the effect of the silicon carbide (SiC) matrix content on the mechanical behaviour of a threedimensional needled carbon fibre-reinforced SiC matrix composite (C/SiC) was investigated. The SiC matrix content was controlled by the infiltration time, and it can be divided into two stages for the evolution of matrix densification, leading to different mechanical responses. In the first stage, with an increase in the SiC matrix content from 12 to 39 vol%, the matrix was filled into a non-woven cloth, leading to an improvement in the loading efficiency of the fibre bundles. Thus, flexural strength and fracture toughness increased sharply from 54 to 218 MPa and 1.3-13.0 MPa m1/2, respectively. As the SiC matrix content increases to 59 vol% in the second stage, the flexural strength and fracture toughness increased to 256 MPa and 15.4 MPa m1/2, respectively. The infiltration ability of the SiC matrix into the non-woven cloth reached the threshold in this stage, and the SiC matrix filled the short-cut web layer, resulting in a slightly increasing tendency of strength and toughness.