Preparation and properties study of boron nitride/epoxy resin insulating thermoconductive composite

The boron nitride (BN)/epoxy resin (EP) insulating thermoconductive composite material were prepared by adding BN powder to EP, and the thermal conductivity, tensile strength, section SEM (scanning electron microscope) and thermal weight loss of the composite were analyzed. At the same time, the thermal conductivity and the change of tensile strength with the increase of filling amount were explored. The results showed that when the fi-lling amount of BN was 30%, the thermal conductivity of the composite at 25℃ reached 0.92 W/(m·K), tensile strength was 15.5 MPa. With the increasing of BN filler, the thermal conductivity of the composite was also gradually increasing, but the tensile strength was gradually reducing. The result of thermal weight loss analysis showed that initial thermal decomposition temperature had no obvious change with the increase of BN filler, and thermal weight loss was gradually reducing, decomposition temperature gradually increased. In addition, with the increase of particle size of the BN, the thermal conductivity of the composite increased, while the tensile strength decreased.