物理化学学报 >> 2006, Vol. 22 >> Issue (03): 316-321.doi: 10.3866/PKU.WHXB20060312

研究论文 上一篇    下一篇

新型ACNT/C纳米复合材料氧化性能的初步研究

李志; 巩前明; 梁吉; 黄启忠; 黄伯云   

  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; 中南大学粉末冶金国家重点实验室, 长沙 410083
  • 收稿日期:2005-08-29 修回日期:2005-10-27 发布日期:2006-03-10
  • 通讯作者: 梁吉 E-mail:liangji@mail.tsinghua.edu.cn

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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摘要： 以定向碳纳米管阵列为骨架, 利用化学气相渗(CVI)工艺制备了新型的定向碳纳米管/炭(ACNT/C)纳米复合材料, 并对其氧化性能进行了初步的研究. SEM形貌观察表明, 氧化后的ACNT/C纳米复合材料仍然保持着其基本的管状结构特点, 氧化由外层热解炭向内逐渐进行. 热失重分析 (TGA)检测结果表明, 密度为0.80 g•cm-3的ACNT/C纳米复合材料在空气中的热失重转变温度约为720 ℃, 比相同工艺条件下制备的密度为1.5 g•cm-3的C/C复合材料提高了50 ℃左右. 静态空气等温氧化实验表明, ACNT/C纳米复合材料在550 ℃氧化过程中的化学反应速率明显低于C/C复合材料. 这主要是由于ACNT/C纳米复合材料具有稳定的界面和较高的晶化程度.

关键词: 定向碳纳米管, C/C复合材料, 纳米复合材料, 氧化性能

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