炭纤维编织物中引入SiC微粉的超声工艺研究

Study of SiC Fillers into Three-dimensional Braided Carbon Fiber Preform by Ultrasonic Infiltration

为缩短先驱体浸渍裂解制备炭纤维三维编织物(3D-BCf)增强SiC陶瓷基复合材料的工艺周期,在3D-BCf中采用超声浸渍法预先引入SiC微粉。考察了微粉粒度、浆料SiC/无水乙醇(EtOH)质量比等参数对引入SiC微粉体积分数的影响。结果表明,当SiC微粉粒度为0.4μm、浆料SiC/EtOH质量比为1∶1时超声浸渍效果最佳,在3D-BCf中引入SiC微粉的体积分数可达到16.4%,预先引入SiC微粉可以缩短材料的致密化周期。

SiC fillers were introduced into three-dimensional braided carbon fiber preform((3D-BC_f)) by ultrasonic infiltration in order to shorten the fabrication cycles of C_f/SiC composites through precursor-infiltration-pyrolysis (PIP). Effects of diameter of SiC fillers and mass ratio of SiC/EtOH on volume fraction of introduced SiC fillers in 3D-BC_f were investigated. The results show that the highest volume fraction (16.4%) of SiC fillers can be achieved by ultrasonic infiltration when the diameter of SiC fillers is 0.4μm and the mass ratio of SiC/EtOH is 1∶1, which can shorten the densification cycles of C_f/SiC composites.