High‐thermal‐conduction and low‐cost composite originated from the tight packing structure of boron nitride sheets and binary alumina balls

In this work, a novel low‐cost and thermal conductive composite consisting of boron nitride (BN)/aluminum oxide (Al 2 O 3 ) heat transfer network was constructed by the high packing volume fraction of two sizes Al 2 O 3 spheres at the optimal weight ratio. The dense packing of 5 μm Al 2 O 3 and 20 μm Al 2 O 3 supports the BN sheets scattering around Al 2 O 3 to interconnect into main three‐dimensional BN network, and acts as thermal conductive...