Microstructure, mechanical and anti-ablation properties of Mg-modified C/ C-ZrC-SiC composites prepared by sol-gel technology

作     者：Zheng, Lei Fang, Cunqian Zeng, Chen Luo, Xiao Zhang, Ze Zhang, Xiaxiang Zhang, Mingyu Huang, Qizhong 

作者机构：Cent South Univ Natl Key Lab Sci & Technol High strength Struct Ma Changsha 410083 Peoples R China Cent South Univ Sch Met & Environm Changsha 410083 Peoples R China 

出 版 物：《CERAMICS INTERNATIONAL》 (Ceram Int)

年 卷 期：2022年第48卷第23期

页      面：34728-34742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：Joint Funds of the National Natural Science Foundation of China [U19A2088] Emerging Strategic Industrial Science and Technology of Hunan Province, China [2019GK4012] 

主　　题：C C-ZrC-SiC composites Mg Sol -gel Property 

摘      要：Mg-modified C/C-ZrC-SiC composites were fabricated by a sol-gel process, and the influences of the Mg/(Zr + Si) molar ratio on the microstructure and the mechanical and anti-ablation properties of the composites were investigated. The results showed that Mg addition not only optimized the distribution of surficial ceramic par-ticles but also improved the flexural strength of composites by inhibiting the ceramization of fibres. Fabricated Mg/(Zr + Si) with a molar ratio of 0.040:0.18 increased the flexural strength of the composite from 173.15 MPa to 331.22 MPa, and the elastic modulus ranged from 11.46 GPa to 23.09 GPa. After plasma flame ablation for 180 s, this composite also showed excellent anti-ablation performance with linear and mass ablation rates of 3.91 mu m/s and-0.23 mg/s, respectively. The superior ablation property was ascribed to the formation of a consecutive oxide layer constructed by a viscous mixed liquid consisting of liquid Mg-Si-O and Zr-Si-O phases and the robust skeleton of the coarsening ZrO2.