ACNT/C纳米复合材料导热性能及其机理的初步研究  

Studies on Thermal Conductive Properties and Mechanism of a New ACNT/C Nanocomposite Material

作　　者：李志[1] 巩前明[1] 王野[1] 梁吉[1] 黄启忠[2] 黄伯云[2] 

机构地区：[1]清华大学机械系 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《高等学校化学学报》2006年第10期1819-1822,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:10332020)资助.

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/cm3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/cm3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.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.

关 键 词：定向碳纳米管 碳/碳复合材料 纳米复合材料 热导率 

分 类 号：O613.71[理学—无机化学] O635.1[理学—化学]