The ceramic (Zr/Ti)B2 particles with high thermal conductivity were introduced into epoxy matrix for the preparation of epoxy composites by in situ polymerization method.The laser flash method was taken to investigate the thermal conductivity of the epoxy composites

and a numerical analysis was applied to build up an ideal model for further discussion as well.The experimental results demonstrate that the introduction of TiB2 and ZrB2particles can improve the thermal conductivity of the epoxy composites effectively.And within a certain range

the thermal conductivity of the epoxy composites was improved with the increasing content of the diboride ceramic fillers.The improvements of thermal conductivity of the epoxy composites filled with TiB2 and ZrB2fillers were up to 100.7% and 126.8%

respectively

compared to the neat epoxy resin.Besides

the epoxy composites filled with ZrB2fillers show higher values of thermal conductivity than the TiB2-filled ones

which is attributed to the lower interface resistance in the ZrB2-epoxy system.The results of the numerical analysis exhibit that the experimental values of thermal conductivity of the epoxy composites are similar to those calculated in ideal models

where the deviations between experimental and ideal values in ZrB2-filled epoxy composites are smaller than those in TiB2-filled epoxy composites at high fractionlevels of the fillers.