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B4C-SiC composites with fine grains were fabricated with hot-pressing pyrolyzed mixtures of polycarbosilane-coated B4C powder without or with the addition of Si at 1950 ℃ for 1 h under the pressure of 30 MPa.SiC derived from PCS promoted the densification of B4C effectively and enhanced the fracture toughness of the composites.The sinterability and mechanical properties of the composites could be further improved by the addition of Si due to the formation of liquid Si and the elimination of free carbon during sintering.