Preparation and properties of C/C-ZrB2-SiC composites by high-solid-loading slurry impregnation and polymer infiltration and pyrolysis（PIP）

作     者：Li-ping RAN Fei RAO Ke PENG Huan YIN Mao-zhong YI 冉丽萍;饶菲;彭可;尹欢;易茂中;中南大学

作者机构：State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2019年第29卷第10期

页      面：2141-2150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：Project(GFZX0101040101-2012C20X) supported by the National Basic Research Program of China Project(2017JJ2320) supported by the Natural Science Foundation of Hunan Province,China 

主　　题：C/C-ZrB2-SiC composites microstructure mechanical properties ablation properties 

摘      要：Ultrahigh-temperature ceramics were added to C/C composites to meet their application requirement in a high-temperature oxidizing environment. C/C-ZrB2-SiC composites were fabricated by high-solid-loading slurry impregnation with polymer infiltration and pyrolysis. The dispersion and rheological behavior of ZrB2 slurry and the microstructural, mechanical, and ablation properties of the C/C-ZrB2-SiC composites were investigated. Results indicated that a well-dispersed and low-viscosity ZrB2 slurry was obtained using 0.40 wt.% polyethyleneimine as a dispersant at pH 5. Ceramics were uniformly distributed in the short-cut fiber layer and needle-punched area. The flexural strength of the C/C-ZrB2-SiC composites was 309.30 MPa. The composites exhibited satisfactory ablation resistance under the oxyacetylene flame of 2500℃, and the mass and linear ablation rates were 0.40 mg/s and 0.91 μm/s, respectively. A continuous and compact Zr O2 layer, which could effectively reduce the diffusion rate of oxygen and protect the composites from being ablated, was formed.