高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

ACNT/C纳米复合材料导热性能及其机理的初步研究

李志1, 巩前明1, 王野1, 梁吉1, 黄启忠2, 黄伯云2   

    1. 清华大学机械系, 清华大学先进成形制造重点实验室, 北京 100084;
    2. 中南大学粉末冶金国家重点实验室, 长沙 410083
  • 收稿日期:2005-09-16 修回日期:1900-01-01 出版日期:2006-10-10 发布日期:2006-10-10
  • 通讯作者: 梁吉

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

LI Zhi1, GONG Qian-Ming1, WANG Ye1, LIANG Ji1, HUANG Qi-Zhong2, HUANG Bai-Yun2   

    1. Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijng 100084, China;
    2. State Key Lab for Powder Metallurgy, Central South University, Hunan 410083, China
  • Received:2005-09-16 Revised:1900-01-01 Online:2006-10-10 Published:2006-10-10

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被引次数

23

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1.47 g/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1.50 g/cm3的传统C/C复合材料高4～6倍; 经过2 500 ℃热处理, ACNT/C的热导率接近140 W/(m·K), 而C/C仅为40 W/(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.

关键词: 定向碳纳米管, 碳/碳复合材料, 纳米复合材料, 热导率

Abstract: 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/cm3) is all 4—6 times than that of C/C composites(about 1.50 g/cm3). 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.

Key words: Aligned carbon nanotubes, Carbon/carbon composite material, Nanocomposite, Thermal conductivity

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