Synergic effect of graphene oxide (GO) and silicon nitride whisker (Si₃N₄w) on the mechanical properties of nacre-like alumina was investigated in this study. A comprehensive analysis on the composites, including microstructure, relative densities, flexural strength and fracture toughness, was carried out. The experimental results showed that, GO promoted the fracture toughness of the composites, but reduced the flexural strength slightly; while adding a certain amount of Si₃N₄w improved both flexural strength and fracture toughness. With the incorporation of GO and Si₃N₄w, the highest flexural strength reached 520 MPa and the fracture toughness reached 9.59 MPa·m^1/2. Microstructure observation revealed that the enhanced mechanical properties were ascribed to the synergistic toughening mechanisms induced by the nacre-like structure of alumina, GO pull-out, Si₃N₄w pinning and pull-out.

本研究研究了氧化石墨烯 (GO) 和氮化硅晶须 (Si ₃ N ₄ w) 对类珍珠层氧化铝机械性能的协同作用。对复合材料的微观结构、相对密度、弯曲强度和断裂韧性进行了综合分析。实验结果表明，GO提高了复合材料的断裂韧性，但略微降低了抗弯强度；同时添加一定量的Si ₃ N ₄ w 提高了抗弯强度和断裂韧性。GO和Si ₃ N ₄ w的掺入，最高抗弯强度达到520 MPa，断裂韧性达到9.59 MPa·m ^1/2. 微观结构观察表明，增强的机械性能归因于氧化铝的珍珠层状结构、GO 拉出、Si ₃ N ₄ w 钉扎和拉出引起的协同增韧机制。