Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (03): 316-321.doi: 10.3866/PKU.WHXB20060312

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Study on Oxidation Properties of New ACNT/C Nanocomposites

LI Zhi; GONG Qian-Ming; LIANG Ji; HUANG Qi-Zhong; HUANG Bai-Yun   

  1. Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P. R. China; State Key Laboratory for Powder Metallurgy, Central South University, Hunan 410083, P. R. China
  • Received:2005-08-29 Revised:2005-10-27 Published:2006-03-10
  • Contact: LIANG Ji E-mail:liangji@mail.tsinghua.edu.cn

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Abstract: Aligned carbon nanotube/carbon (ACNT/C) nanocomposites were fabricated by traditional chemical vapor infiltration (CVI) technology. The oxidation properties and mechanism of ACNT/C nanocomposites were investigated through SEM, Raman, thermogravimetric analysis (TGA) and static isothermal oxidation. TGA result shows that weight loss temperature of ACNT/C nanocomposites (0.80 g•cm-3) is about 720 ℃, which is 50 ℃ higher than weight loss temperature of carbon/carbon(C/C) composites (1.5 g•cm-3) prepared in the same process. Static isothermal oxidation results further demonstrate that chemical reaction speed of ACNT/C nanocomposites is lower than that of C/C composites obviously in air oxidation process at 550 ℃. SEM micrographs prove that ACNT/C nanocomposites still keep tubular structure in the oxidation process, and the oxidation reaction proceeds from outer layer to inner layer along the radial direction. ACNT/C nanocomposites exhibit good oxidation properties due to stable interface and higher graphitization level. The oxidation mechanism of the nanocomposites is discussed.

Key words: ACNTs, C/C composites, Nanocomposites, Oxidation properties