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新型ACNT/C纳米复合材料氧化性能的初步研究 预览 被引量:3

Study on Oxidation Properties of New ACNT/C Nanocomposites
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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1.5g·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. 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 150℃ 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 clue to stable interface and higher graphitization level. The oxidation mechanism of the nanocomposites is discussed.
作者 李志 巩前明 梁吉 黄启忠 黄伯云 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; 2.State Key Laboratory for Powder Metallurgy, Central South University Hunan 410083, P. R. China)
出处 《物理化学学报》 SCIE CAS CSCD 北大核心 2006年第3期 316-321,共6页 Acta Physico-Chimica Sinica
基金 国家自然科学基金(10332020)资助项目
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 ACNTs, C/C composites, Nanocomposites, Oxidation properties
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