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0.80g·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.
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
