Thermal conductivity of three-component composites of core-shell particles with nanostructured shell layer

Title
Thermal conductivity of three-component composites of core-shell particles with nanostructured shell layer
Authors
김상우문선영최현석이경섭
Keywords
Thermal conductivity; three-component composites; core-shell particles; nanostructure; THERMOPHYSICAL PROPERTIES; particulate composites; mesopores
Issue Date
2011-08
Publisher
19 th EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES
Abstract
In the high-power light-emitting diodes display and multi-functional electronic devices, there are critical issues such as heat dissipation and electromagnetic interference which cause a program to malfunction or to health hazards[1,2]. To solve these issues, multi-component composites with high thermal performance have recently been studied by many researchers [3,4]. In this study, the thermal conductivity of three-component composites of core-shell particles with a nanostructured shell layer was investigated. Soft-magnetic FeCr core and alumina shell powders were fabricated by a supercritical fluid technology combined with sol-gel processing and subsequent heat treatment. As-prepared coreshell particles and additional alumina powders were blended with a polyolefin binder solution, and then were tape-casted onto the Mylar film. The three-component composite sheets consisting of the core-shell particles with a mesoporous γ- Al2O3 shell were obtained and the thermal conductivities were measured. The three-component composites showed much higher thermal conductivity compared to that of the simple mixture composites of the FeCr-alumina. The effect of the core-shell particles with the core-shell particles on thermal conductivity was theoretically calculated using a modified thermal conductivity theory. The higher thermal conductivity was discussed from the results of the theoretical calculation and microstructural analysis.
URI
http://pubs.kist.re.kr/handle/201004/40214
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KIST Publication > Conference Paper
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