The addition of AlN and alumina fillers to the epoxy resin
resulted in a steady increase in the thermal conductivity of
the composites, as shown in Fig. 3. The thermal conductivi
ties of both composites rose with increasing filler content.
AlN composite exhibited thermal conductivity of 7.15W/
mK at 68.5 vol% filler content. However alumina compo
site had lower thermal conductivity of 2.68W/mK even if
the filler content was as high as 63.8 vol%. This result rev
eals that an epoxy composite with high thermal conductivi
ty can be obtained by using AlN filler. There is a large differ
ence between the thermal condutivities of AlN and alum
a-filler-added epoxy resin composites. It is obviousinthat
the thermal conductivity of epoxy resin composites is
strongly dependent on the type of filler