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

高固相含量浆料浸渍结合PIP法制备C/C–ZrB2–SiC复合材料及其性能（英文）

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(粉末冶金国家重点实验室)

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第10期2141-2150,共10页中国有色金属学报（英文版）

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

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.往C/C复合材料中加入超高温陶瓷,以满足其在高温有氧环境中的应用。采用高固相含量浆料浸渍结合前驱体浸渍裂解工艺制备C/C-ZrB2-SiC复合材料,研究ZrB2浆料的分散性和流变行为,以及C/C-ZrB2-SiC复合材料的显微组织、力学性能和烧蚀性能。结果表明:硼化锆浆料在分散剂聚乙烯胺含量为0.40 wt.%、pH值为5的条件下具有良好的分散性和较低的黏度。陶瓷相均匀地分布在C/C复合材料的网胎层和针刺区;C/C-ZrB2-SiC复合材料的抗弯强度为309.30MPa,其在2500℃氧乙炔火焰烧蚀条件下显示出优异的烧蚀性能,质量烧蚀率和线烧蚀率分别为0.40 mg/s和0.91μm/s。此外,在烧蚀过程中,复合材料表面形成连续、致密的二氧化锆层,能有效地降低氧气向材料内部的扩散速率,对复合材料形成良好的保护。

关 键 词：C/C-ZrB2-SiC composites microstructure mechanical properties ablation properties 

分 类 号：V25[一般工业技术—材料科学与工程] TB33[航空宇航科学与技术—航空宇航制造工程]