Thermal conductivity determination of conductor/insulator composites by fractal: Geometrical tortuosity and percolation
Thermal conductivity determination of conductor/insulator composites by fractal: Geometrical tortuosity and percolation
复制标题
通过分形确定导体/绝缘体复合材料的热导率：几何曲折和渗流
DOI：
10.1016/j.compositesb.2016.02.046
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发表时间：
2016-05-01
影响因子：
13.1
通讯作者：
Zhao, Jie
中科院分区：
文献类型：
--
作者：
Feng, Li-Chao;Xie, Ning;Zhao, Jie
具有不同导电相几何结构的导体/绝缘体复合材料的热导率预测是无序复合材料的最大挑战之一。为了研究第二相的几何结构对导体/绝缘体复合材料导热性能的影响，采用热压工艺制备了球形和树枝状Cu的Cu 2 O/Cu复合材料。采用计盒分形维数表征第二相的几何结构。枝状Cu的分形维数显著低于相同填充量的球形Cu。首次引入分形维数随Cu含量增加的增长率来预测复合材料的热导率。这些结果提供了一种途径，以确定第二相的几何结构对导热系数的影响，并揭示了一些光的曲折度，分形维数，和导体/绝缘体复合材料的整体性能之间的关系。(C)2016爱思唯尔有限公司版权所有
The thermal conductivity prediction of a conductor/insulator composite with various geometrical structures of the conducting phase is one of the top challenges in disordered composites. To determine the effects of the geometrical structure of the second phase on the thermal conductivity of a conductor/insulator composite, Cu2O/Cu composites were prepared with spherical or branch-like Cu by hot pressing technology. The box-counting fractal dimension was applied to characterize the geometrical structure of the second phase. The fractal dimension of branch-like Cu shows significantly lower values than the spherical Cu with a same filling content. The fractal dimension increasing rate with increasing Cu content was first introduced to predict the thermal conductivity of the composites. These results provide a pathway to determine the effects of the geometrical structure of the second phase on the thermal conductivity and shed some lights on building relationships between the tortuosity, fractal dimension, and overall performances of conductor/insulator composites. (C) 2016 Elsevier Ltd. All rights reserved.