Abstract: Silicon carbide (SiC) composites were prepared by hot-press sintering from α-SiC starting powders with BaAl₂Si₂O₈ (BAS). The effects of additives on densification, microstructure, flexural strength, and fracture behavior of the liquid phase sintered (LPS) SiC composites were investigated. The results show that the served BAS effectively promotes the densification of SiC composites. The flexural strength and fracture toughness of the SiC composites can reach a maximum value of 454 MPa and 5.1 MPa·m^1/2, respectively, for 40% (w/w) BAS/SiC composites. SiC grain pullout, crack deflection, and crack bridging were main toughening mechanisms for the sintered composites.

Key words: Silicon carbide (SiC), BaAl₂Si₂O₈ (BAS), Liquid phase sintered (LPS), Mechanical properties

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