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Citation: LI Zhi, NG Qian-Ming, LIANG Ji, HUANG Qi-Zhong, HUANG Bai-Yun. Study on Oxidation Properties of New ACNT/C Nanocomposites[J]. Acta Physico-Chimica Sinica, ;2006, 22(03): 316-321. doi: 10.3866/PKU.WHXB20060312 shu

Study on Oxidation Properties of New ACNT/C Nanocomposites

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 Date: 29 August 2005
Available Online: 10 March 2006

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 od oxidation properties due to stable interface and higher graphitization level. The oxidation mechanism of the nanocomposites is discussed.
- ACNTs; C/C composites; Nanocomposites; Oxidation properties
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