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Effect of electric field application during curing process on thermal conductivity of epoxy composite materials with low content inorganic particles

The aim of this study is to improve both thermal conductivity and electrical insulation properties of the epoxy based composites. This paper deals with evaluation of condition of filler orientation by electric field application to improve thermal conductivity effectively. To discuss efficient preparation condition, 18 kinds of specimen containing different kinds of filler were fabricated with changing the duration of applied electric field from 0 to 180 min. We selected various kinds of fillers as follows: three kinds of specimens with plate-like alumina filler with 2, 5, 10 μm in size, and three kinds of agglomeration types of boron nitride. As a result, the thermal conductivity of the specimen of plate-like alumina of 10 μm in grain size was improved about twice as much as that with applied electric field, being found to be the most effective. Details of experimental methods and date are discussed in the paper.