摘要采用浆料注射法将天然鳞片石墨粉添加到纤维预制体中,并结合化学气相渗透工艺(CVI)制备C/C复合材料。通过X射线无损检测、扫描电镜、偏光显微镜和材料力学性能测试,研究石墨浆料注射对C/C复合材料显微组织与力学性能的影响。结果表明：石墨浆料注射可将石墨引入到纤维预制体中,替代部分热解炭,并为热解炭提供新的形核位点和沉积表面,加速CVI致密化进程;且石墨的加入有利于粗糙层热解炭的形成,提高材料的可石墨化度。经80 h 等温CVI制得密度为1.68 g/cm3的C/C复合材料,抗弯强度为69.07 MPa,与传统等温CVI工艺相比,抗弯强度相近,平均增密速率提高近3倍;热解炭将纤维和石墨连成一个整体,材料表现出一定的假塑性断裂。
Abstract：C/C composites were fabricated by novel slurry injection and chemical vapor infiltration (CVI). In the slurry injection step, natural flake graphite was introduced to carbon fiber preform. Microstructure and mechanical properties of the as-fabricated C/C composites were analysed by X-ray nondestructive test, scanning electron microscope (SEM) polarizing microscope (PLM), and mechanical properties test. The results show that the flake graphite which replaces part of pyrolytic carbon can be introduced by slurry injection. This injected flake graphite can provide additional nucleation sites thereby greatly promoting densification rate of CVI process. The addition of natural flake graphite is beneficial to the formation of rough lamina (RL) pyrolytic carbon (PyC) and increases the degree of graphitization of the composites. After 80 h CVI, C/C composites with a density of 1.68 g/cm3 and a flexural strength of 69.07 MPa are obtained. Compared with the C/C composites fabricated by traditional CVI process, the flexural strength is close while the average densification rate is nearly tripled. Moreover, carbon fibers and flake graphite are well connected by PyC and the obtained C/C composites shows pseudo-plasticity fracture.
胡姣, 李国栋, 张洋, 韩前武, 姜毅. 新型浆料注射法制备C/C复合材料的显微组织及力学性能[J]. 粉末冶金材料科学与工程, 2020, 25(2): 171-178.
HU Jiao, LI Guodong, ZHANG Yang, HAN Qianwu, JIANG Yi. Microstructure and mechanical properties of C/C composites prepared by a novel slurry injection technique. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 171-178.
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2020, Vol. 25 
