Enhanced mechanical and thermal properties of textured Si3N4/BN composite ceramics prepared by hot-pressing

Textured Si 3 N 4 /BN composite ceramics were successfully fabricated via hot-press sintering. The effects of h-BN content on the microstructure, mechanical properties and thermal properties were systematically investigated. The results indicate that increasing the h-BN content leads to a continuous decline in both the density and mechanical properties of Si 3 N 4 /BN composite ceramics. By further adjusting the particle size of h-BN, the textured Si 3 N 4 /BN composite ceramics incorporating 15 vol% of 8 μm h-BN exhibit high thermal conductivity (77.5 W m −1  K −1 ) and reliable mechanical properties (707.3 MPa and 8.63 MPa m 1/2 ) at low sintering temperature and short dwelling time (1750 °C for 2 h). Therefore, this textured composite ceramics design offers a novel approach for the rapid fabrication of composite ceramics with high thermal conductivity and demonstrates significant potential in the field of advanced thermal management.