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Chem. J. Chinese Universities

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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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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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