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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Pitch-based ribbon-shaped carbon-fiber-reinforced one-dimensional carbon/carbon composites with ultrahigh thermal conductivity
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Pitch-based ribbon-shaped carbon-fiber-reinforced one-dimensional carbon/carbon composites with ultrahigh thermal conductivity

机译：沥青基带状碳纤维增强的一维碳/碳复合材料，具有超高导热性

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摘要

Ribbon-shaped carbon fibers have been prepared from mesophase pitch by melt-spinning, oxidative stabilization and further heat treatment. The internal graphitic layers of ribbon-shaped carbon fibers graphitized at 2800 °C show a highly preferred orientation along the longitudinal direction. Parallel stretched and unidirectional arranged ribbon-shaped carbon fibers treated at about 450 °C were sprayed with a mesophase pitch powder grout, and then hot-pressed at 500 °C and subsequently carbonized and graphitized at various temperatures to produce one-dimensional carbon/carbon (C/C) composite blocks. The shape and microstructural orientation of ribbon fibers have been maintained in the process of hot-pressing and subsequent heat treatments and the main planes of the ribbon fibers are orderly accumulated along the hot-pressing direction. Microstructural analyses indicate that the C/C composite blocks have a typical structural anisotropy derived from the unidirectional arrangement of the highly oriented wide ribbon-shaped fibers in the composite block. The thermal conductivities of the C/C composites along the longitudinal direction of ribbon fibers increase with heat-treatment temperatures. The longitudinal thermal conductivity and thermal diffusivity at room temperature of the C/C composite blocks graphitized at 3100 °C are 896 W/m K and 642 mm~2/s, respectively.
机译：带状碳纤维是由中间相沥青通过熔融纺丝，氧化稳定化和进一步的热处理制得的。在2800℃下石墨化的带状碳纤维的内部石墨层显示出沿纵向的高度优选取向。将经约450°C处理的平行拉伸和单向排列的带状碳纤维喷涂中间相沥青粉末灌浆，然后在500°C下热压，随后在各种温度下碳化和石墨化以生成一维碳/碳（C / C）复合块。带状纤维的形状和微结构取向在热压和随后的热处理过程中得以保持，并且带状纤维的主平面沿着热压方向有序地堆积。微观结构分析表明，C / C复合材料块具有典型的结构各向异性，该各向异性是由复合材料块中高度定向的宽带状纤维的单向排列产生的。 C / C复合材料沿带状纤维纵向的热导率随热处理温度的增加而增加。在3100°C下石墨化的C / C复合材料块在室温下的纵向热导率和热扩散率分别为896 W / m K和642 mm〜2 / s。

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