Liu Yun, Ma Long, Dong Runa, Cui Kexin, Hou Yongzhao, Yang Wen, Liu Yeqing, Zhong Cheng, Wen Guangwu, Zhang Lijuan
School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China.
Shandong Guiyuan Advanced Ceramics Co., Ltd., Zibo 255086, China.
Materials (Basel). 2022 Apr 8;15(8):2757. doi: 10.3390/ma15082757.
Cf/C-SiC composites have become the preferred material for high-temperature load-bearing applications because of their low density, high strength, and excellent thermal-physical properties. Due to the composite's poor sintering performance, the sintering temperature and pressure required for the preparation of Cf/C-SiC by traditional methods are also relatively high, which limits its engineering application. Herein, based on the precursor-derived ceramic route and C/C composites material preparation process, a binary binder (coal pitch and polysilylacetylene) is developed, which combines a carbon source, SiC precursor, and semi-ceramic SiC filler organically. Then, the SiC phase was successfully introduced into C/C composites by the slurry impregnation-hot pressing sintering method. The prepared Cf/C-SiC composites showed good mechanical properties, with a density of 1.53 g/cm and a bending strength of 339 ± 21 MPa. Moreover, the effects of the binary binder on the microstructure, density, and mechanical properties of Cf/C-SiC composites were investigated. This work provides a novel and effective approach to fabricating Cf/C-SiC composites with low density and high strength.
Cf/C-SiC复合材料因其低密度、高强度和优异的热物理性能，已成为高温承重应用的首选材料。由于该复合材料烧结性能较差，传统方法制备Cf/C-SiC所需的烧结温度和压力也相对较高，这限制了其工程应用。在此，基于先驱体衍生陶瓷路线和C/C复合材料制备工艺，开发了一种二元粘结剂（煤沥青和聚硅乙炔），它将碳源、SiC先驱体和半陶瓷SiC填料有机结合。然后，通过浆料浸渍-热压烧结法成功地将SiC相引入C/C复合材料中。制备的Cf/C-SiC复合材料表现出良好的力学性能，密度为1.53 g/cm，弯曲强度为339±21 MPa。此外，还研究了二元粘结剂对Cf/C-SiC复合材料微观结构、密度和力学性能的影响。这项工作为制备低密度、高强度的Cf/C-SiC复合材料提供了一种新颖有效的方法。
