Che Zhe, Wang Shaokai, Gu Yizhuo, Zhang Wei, Jiang Cai, Li Min
Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
Ningbo Institute of Technology, Beihang University, Ningbo 315800, China.
Nanomaterials (Basel). 2021 Mar 17;11(3):758. doi: 10.3390/nano11030758.
This paper fabricates a carbon nanotube (CNT ) film-reinforced mesophase pitch-based carbon (CNTF/MPC) nanocomposite by using a hot-pressing carbonization method. During the carbonization, the stacked aromatic layers tended to rearrange into amorphous carbon, and subsequently generated crystalline carbon in the matrix. The continuous entangled CNT networks were efficiently densified by the carbon matrix though optimized external pressure to obtain the high-performance nanocomposites. The CNTF/MPC@1300 displayed a stable electrical conductivity up to 841 S/cm at RT-150 °C. Its thermal conductivity in the thickness direction was 1.89 W/m∙K, an order of magnitude higher than that of CNT film. Moreover, CNTF/MPC@1300 showed a mass retention of 99.3% at 1000 °C. Its tensile strength was 2.6 times the CNT film and the tensile modulus was two orders of magnitude higher. Though the CNTF/MPC nanocomposites exhibited brittle tensile failure mode, they resisted cyclic bending without damage. The results demonstrate that the CNTF/MPC nanocomposite has potential application in multi-functional temperature resistance aerospace structures.
本文采用热压碳化法制备了一种碳纳米管（CNT）薄膜增强中间相沥青基碳（CNTF/MPC）纳米复合材料。在碳化过程中，堆叠的芳香层倾向于重排成无定形碳，随后在基体中生成结晶碳。通过优化外部压力，连续缠结的CNT网络被碳基体有效地致密化，从而获得高性能的纳米复合材料。CNTF/MPC@1300在室温至150°C范围内显示出高达841 S/cm的稳定电导率。其在厚度方向上的热导率为1.89 W/m∙K，比CNT薄膜高一个数量级。此外，CNTF/MPC@1300在1000°C时的质量保留率为99.3%。其拉伸强度是CNT薄膜的2.6倍，拉伸模量高两个数量级。尽管CNTF/MPC纳米复合材料表现出脆性拉伸破坏模式，但它们能抵抗循环弯曲而不损坏。结果表明，CNTF/MPC纳米复合材料在多功能耐高温航空航天结构中具有潜在应用。
