为探究引入中间相沥青基碳纤维(mesophase pitch basedcarbon fiber,MPCF)对碳/碳-铜(carbon/carbon-copper,C/C-Cu)复合材料的性能影响,以MPCF和聚丙烯腈基碳纤维(polyacrylonitrilebased carbon fiber,PANCF)为原料制备两种针刺预制体,采用化学气相渗透法(chemical vapor infiltration,CVI)、真空压力浸渍法制备两种C/C-Cu复合材料.对材料微观形貌、热物理性能和力学性能表征,结果表明:与PANCF针刺预制体相比,在预制体中加入MPCF提升了C/C-Cu复合材料$XY$向导热系数,降低了线膨胀系数;C/C-Cu复合材料弯曲强度、弯曲模量和$Z$向压缩强度分别增高20.4%、32.3%、27.7%.
To investigate the effect of introducing mesophase pitch based carbon fiber (MPCF) on the properties of carbon/carbon-copper(C/C-Cu) composites. Two types of needling preforms were prepared by MPCF and polyacrylonitrile based carbon fiber (PANCF). Two kinds of C/C-Cu composites were prepared by vacuum pressure impregnation after chemical vapor infiltration (CVI). By characterizing the microstructure, thermophysical properties and mechanical properties, the results showed that, comparing with PANCF needle punched preforms, the addition of MPCF could improve the $XY$ thermal conductivity and reduce the linear expansion coefficient of C/C-Cu composite. The bending strength, bending modulus and $Z$ compression strength of C/C-Cu composite increase 20.4%, 32.3% and 27.7%, respectively.
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[3] Dong Z J, Sun B, Zhu H, et al. A review of aligned carbon nanotube arrays and carbon/carbon composites: fabrication, thermal conduction properties and applications in thermal management [J]. New Carbon Materials, 2021, 36(5): 873-892.
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