三维针刺碳毡中碳纤维的排布方式有利于电磁波的吸收.采用碳基体和氮化硼(BN)基体与三维针刺碳毡复合,可望获得耐高温吸波复合材料.本文中采用先驱体浸渗裂解法(PIP)制备多孔三维针刺碳/碳(C/C)复合材料,再利用化学气相渗透法(CVI)将BN引入C/C复合材料中,最终获得了C/C-BN复合材料.研究了CVI时间对三维针刺C/C-BN复合材料微结构、力学性能及介电性能的影响规律.随着CVI时间的增加,C/C-BN的密度增加,孔隙奉降低,抗弯强度提高,介电常数增加,介电损耗降低.在CVI时间达160 h后,C/C-BN密度为1.43 g/cma,总气孔率为25%,抗弯强度达到82MPa.
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