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中文摘要：
以定向碳纳米管（ACNT）阵列为骨架，利用化学气相渗（CVI）工艺制备了新型的定向碳纳米管／碳（ACNT／C）纳米复合材料．导热性能测试结果表明，密度为1．47g／cm^3的ACNT／C纳米复合材料的热扩散系数和热导率均比相同工艺条件下密度为1．50g／cm^3的传统C／C复合材料高4-6倍；经过2500℃热处理，ACNT／C的热导率接近140W／（m·K），而C／C仅为40W／（m·K）左右．这主要是由于CNT对热解炭结晶存在诱导作用，同时特殊的准一维结构也减少了热扩散时“声子”的散射．
英文摘要：
Aligned carbon nanotubes reinforced carbon matrix（ACNT/C） nanocomposites were fabricated by chemical vapor infiltration （CVI） technology. With carbon fiber reinforced carbon （ C/C ） composites in the same process as contrast, thermal conductivities of the composites were tested by laser flash method. The results show that the thermal diffusivity and conductivity of ACNT/C （ about 1.47 g/cm^3 ） is all 4—6 times than that of C/C composites（about 1.50 g/cm^3）. After heat treatment at 2 500℃, the thermal conductivity of ACNT/C can reach 140 W/（ m · K） , and the thermal conductivity of C/C composites is only about 40 W/ （m · K）. It was ascribed to that pyrocabon growing surround CNT shows a good crystallization and graphitizability, on the other hand, the quasi-one-dimensional long tubular graphitic structure can reduce phonon-phonon Umklapp scattering, and increase thermal conduction in ACNT/C nanocomposites at the same time.
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