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Effect of additive composition on fracture toughness of in situ-toughened SiC-Si3N4 composites was investigated for five different additive compositions. The highest toughness (6.4 MPa ·m1/2) in SiC-Si3N4 composites investigated herein was obtained when an Y-Mg-Si-Al-O-N oxynitride glass was used as a sintering additive. The improvement in fracture toughness was produced by enhanced bridging and deflection by Si3N4 grains.