中间相沥青基炭泡沫材料有效导热系数表征方法研究  

Research on characterization method of mesophase-pitch-derived carbon foam effective thermal conductivity

作　　者：赵瑾 陈宇迪 邹涛 栗丽 刘卫卫 王小飞 Zhao Jin;ChenYudi;Zou Tao;Li Li;Liu Weiwei;Wang Xiaofei(Institue of Analysis and Testing,Beijing Academy of Science and Technology Beijing Center for Physical&Chemical Analysis,Beijing 100087,China;Department of Chemical Protection,Research Institute of Chemical Defense,Beijing 100191,China)

机构地区：[1]北京市科学技术研究院分析测试研究所(北京市理化分析测试中心),北京100087 [2]军事科学院防化研究所化学防护研究所,北京100191

出　　处：《分析仪器》2022年第6期77-83,共7页Analytical Instrumentation

基　　金：2021年改革与发展专项自立课题;课题编号:2021ZL0104。

摘　　要：提出了一种基于中间相沥青基炭泡沫材料真实孔结构特点的数值模拟计算有效导热系数的方法。针对实际应用的中间相沥青基炭泡沫材料,通过高分辨显微CT扫描、压汞法、闪光法,分别对材料微观结构、孔隙率及孔分布、导热性能进行系统表征。采用三维重构、有限元仿真进行导热系数数值模拟计算有效导热系数并与实际测试结果对比。结果表明,有限元仿真计算的导热系数需引入孔结构修正系数,进而表征炭泡沫材料的有效导热系数。对于大尺寸中间相沥青基炭泡沫有效导热系数的表征,确定前驱体的导热参数,并结合孔结构的有限元仿真计算与孔隙率实测数据,可预估大尺寸炭泡沫样件的有效导热系数。The micro structure,porosity,pore distribution and thermal conductivity of mesophase-pitchderived carbon foams were systematically characterized by high resolution CT micro-scanning,mercury injection and laser flash method.The equivalent thermal conductivity was calculated by numerical simulation of thermal conductivity using three-dimensional reconstruction and finite element simulation and compared with the actual test results.The results showed that the thermal conductivity calculated by finite element simulation should be introduced into a pore structure correction coefficient to characterize the effective thermal conductivity of carbon foam materials.For the characterization of the effective thermal conductivity of large mesophase-pitch-derived carbon foam,the effective thermal conductivity of which can be estimated as long as the determination of the thermal conductivity parameters of the precursor,combined with the finite element simulation calculation of the pore structure and the porosity data.

关 键 词：中间相沥青基炭泡沫 显微CT扫描 导热系数 有限元仿真 压汞法 闪光法 

分 类 号：TB383.4[一般工业技术—材料科学与工程] TB115[理学—数学]