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The B4C@TiB2 composite powders with core-shell structure were fabricated by in-situ formation of TiB2 on the surface of B4C by chemical coating combined with heat treatment, which the tetrabutyl titanate and B4C powders were used as raw materials. The results showed that the B4C-TiB2 core-shell interface was constructed, which transformed boron carbide from stoichiometric B4C to boron-rich phase B13C2 and caused severe lattice distortion. When the TiB2 content increased from 0 wt % to 20 wt %, the minimum reflection loss value(RLmin) of B4C@TiB2 composite powder increased from-9.76 dB to-19.94 dB. It can be attributed to the improvement of impedance matching of B4C powders. Furthermore, the lattice distortion and core-shell structure enhanced the dipole polarization and the interface polarization, respectively. The synergistic effects improved the dielectric loss capability, which significantly improved the electromagnetic wave absorption performance of B4C powders.  [ABSTRACT FROM AUTHOR]

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