文献类型：期刊文献

中文题名：纳米碳管对泡沫炭的超临界发泡行为及其力学性能的影响机制

英文题名：Effect Mechanisms of Carbon Nanotubes on the Supercritical Foaming Behaviors and Mechanical Performance of Carbon Foam

作者：鲍英[1];王春晓[1];詹亮[1];王艳莉[1];杨光智[2];杨俊和[2];凌立成[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,特种功能高分子材料及其相关技术教育部重点实验室,上海200237;[2]上海理工大学材料科学与工程学院,上海200093

年份：2011

卷号：26

期号：10

起止页码：1020

中文期刊名：无机材料学报

外文期刊名：Journal of Inorganic Materials

收录：CSTPCD;;EI(收录号：20114614515078);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000296440800002)】；北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：The Fundamental Research Funds for the Central Universities (WA1014016); National Natural Science Foundation of China (50730003, 50672025, 20806024, 51002051); 863 Program (2008AA062302); National Key Technology R&D Program (2009BAE72B04)

语种：中文

中文关键词：泡沫炭;纳米碳管;超临界发泡

外文关键词：carbon foam; carbon nanotube; supercritical foaming

摘要：采用超声波磁力搅拌的方法,实现了纳米碳管(CNTs)在中间相沥青(MP)中的均匀分散,并考察了CNTs对泡沫炭的超临界发泡行为及其压缩强度的影响.研究结果表明:在超临界发泡过程中,处于过饱和状态的甲苯将优先在CNTs/MP固液界面处成核,进而不断扩散、聚集、膨胀和发泡,导致泡沫炭孔结构的均一性得以提高;当在中间相沥青中均匀分散3.5wt%的CNTs后,所制泡沫炭的压缩强度由3.2MPa提高到4.7MPa,升高了46.9%;CNTs良好的导热性能降低了基体碳在石墨化过程中的热应力差异,使得微裂纹的数量减少,并且其一维纳米结构使得石墨化泡沫炭的孔壁和韧带结构得以增强.
Carbon nanotubes（CNTs） were dispersed uniformly into mesophase pitch（MP） by the co-dispersion of ultrasonic and magnetic force stirring.Effects of CNTs on the supercritical foaming behaviors and mechanical performance of carbon foams were investigated.The results indicate that cell nuclei will form firstly at the CNT/MP interface in the supercritical foaming process,and then diffuse,aggregate,expanse and foam.CNTs can improve the homogenicity of pore structure due to the uniform dispersed CNT/MP interface.When MP is mixed with 3.5wt% CNTs,the compressive strength of graphitized foam increases from 3.2MPa to 4.7 MPa.In the graphitization proc-ess,the heat-stress different of carbon will decrease due to the high thermal conductivity of CNTs,leading to the decrease of the amount of microcracks.Meanwhile,the one-dimensional structure of CNTs reinforces the mechani-cal strength of pore walls and ligaments.