利用中间相沥青纤维中沥青分子的高度择优取向和适度的热塑性热压制备高导热块体炭材料. 对比研究了经不同氧化处理的带形及圆形中间相沥青纤维热压所得炭材料的传导性及力学性能.
结果表明: 相对圆形纤维来说, 由于带形中间相纤维具有更高的纤维轴向取向度和纤维之间更高的接触面积, 故其热压所得材料具有更高的密度和传导性. 经260℃氧化的带形纤维热压所得炭材料的密度、抗弯强度、电阻率及热导率分别达到了2.18g·cm-3、118.4MPa、1.13μΩm和717W/m·K.
Block carbon materials with high thermal conductivities were prepared from mesophase pitch fibers by using their high preferred orientation of pitch molecular and appropriate thermoplasticity through a hot-pressing method. The conductivities and mechanical properties of carbon materials prepared separately from ribbon-shaped and round-shaped mesophase fibers at different oxidizing temperatures were compared and studied. Results show that compared with the round-shaped mesophase fibers, the ribbon-shaped mesophase fibers have higher preferred orientation and larger contact areas, so they have higher densities and conductivities. The density, bending strength, electrical resistivity and thermal conductivity of carbon materials prepared by using ribbon-shaped fibers oxidized at 260℃ and then sintered at 2800℃ are 2.18g·cm-3, 118.4MPa, 1.13μΩm and 717W/m·K, respectively.
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