Percolation based enhancement in effective thermal conductivity of HDPE/LBSMO composites

Bulletin of materials science

T K Dey¹  Madhusree Kole¹  D Tripathi¹ 

[1] Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, India$$Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, IndiaCryogenic Engineering Centre, Indian Institute of Technology, Kharagpur 721 302, India$$

关键词: Thermal conductivity;    HDPE/La0.7Ba0.15Sr0.15MnO3 composites;    transient plane source (TPS);    percolation model.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Thermal conductivity of composites with electrically conducting La_0.7Ba_0.15Sr_0.15MnO₃ (LBSMO) filler of nanometric grain size in HDPE matrix is investigated. Volume fraction of LBSMO fillers was varied between 0 and 0.30. SEM photographs of the composites show the presence of clusters and percolative paths, particularly for composites prepared with higher filler volume fractions. The effective thermal conductivity of the composites displays significant enhancement with increasing filler content in HDPE. A maximum enhancement of ∼65% compared to that for pure HDPE has been observed for composite with 0.30 volume fraction of LBSMO filler. Most of the models those are generally used to predict the properties of two phase mixtures, has been found either to under/overestimate the measured effective thermal conductivity of the composites. We confirm that the observed rapid increase in the effective thermal conductivity of HDPE/LBSMO composite over the studied range of filler volume fraction (viz. 0â€�??0.30), is predicted very well, considering the effect of percolation as proposed by Zhang et al (2009).

【 授权许可】

Unknown