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Vertical particle alignment of boron nitride and silicon carbide binary filler system for thermal conductivity enhancement

Authors
Kim, KihoJu, HyunKim, Jooheon
Issue Date
8-Feb-2016
Publisher
ELSEVIER SCI LTD
Keywords
Polymer-matrix composites (PMCs); Thermal properties; Alignment
Citation
COMPOSITES SCIENCE AND TECHNOLOGY, v.123, pp 99 - 105
Pages
7
Journal Title
COMPOSITES SCIENCE AND TECHNOLOGY
Volume
123
Start Page
99
End Page
105
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/7275
DOI
10.1016/j.compscitech.2015.12.004
ISSN
0266-3538
1879-1050
Abstract
Thermally conductive BN/SiC binary filler and epoxy composite materials were fabricated via magnetic alignment. The magnetic iron oxide particles on the surface of the filler allowed particle re-orientation under the external magnetic field. Owing to its anisotropy, the vertically aligned BN composite had a high thermal conductivity and generated a vertical heat flow path. When the SiC nanoparticles were added to the binary filler, they hindered BN-particle aggregation and led to the formation of a three-dimensional heat conduction path, thereby resulting in increased thermal conductivity. The maximum thermal conductivity (5.77 W/mK) was obtained with an addition of SiC filler, and was 3.08-fold and 1.1-fold higher than that of randomly mixed BN and vertically aligned BN composites, respectively. The additional SiC Fe3O4 particles resulted in significant aggregation of the filler, which in turn led to a decrease in the thermal conductivity. The measured storage modulus of the BN Fe3O4/SiC binary filler composite was also higher than those of the BN Fe3O4 and BN Fe3O4/SiC Fe3O4 composites, owing to the aggregation of particles. (C) 2015 Elsevier Ltd. All rights reserved.
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대학원 (지능형에너지산업융합학과)
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