The invention discloses a multi-layer structured
heat conducting composite containing a
heat conducting film and a preparation method of the multi-layer structured
heat conducting composite. The multi-layer structured heat conducting composite is prepared by steps as follows:
epoxy resin is taken as a matrix, the heat conducting film with
high heat conductivity is taken as a heat conducting medium, flaky
hexagonal boron nitride and granular heat conducting filler are used for compound filling, and then the multi-layer structured heat conducting composite is prepared by layer-by-layer stacking,pre-curing and
hot press molding. The multi-layer structured heat conducting composite has the following advantages: flaky
hexagonal boron nitride is horizontally oriented under
hot press condition and forms a heat
conducting pathway in the horizontal direction together with the horizontally laid heat conducting film; the granular heat conducting filler plays a bridging role in the
system and fills gaps between flaky
hexagonal boron nitride, so that a heat conducting network is perfect, and a heat
conducting pathway in the vertical direction is constructed. The horizontal heat
conductivity ofthe composite is increased by 4639%, the vertical heat
conductivity of the composite is increased by 439%, and the composite has the advantages of
high heat conductivity, good
heat stability, low
dielectric constant and
dielectric loss, excellent mechanical properties and the like.