Abstract
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 ㎫ㆍm 1/2 ) 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.
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