Monolithic Al₂O₃ and graphene-reinforced Al₂O₃ ceramic-matrix nanocomposites were fabricated with the help of spark plasma sintering (SPS). Density, hardness, bending strength, fracture toughness and microstructure of the sintered samples were studied. The contents of graphene were 0–1.6 wt%. The strengthening and toughening mechanisms of the composites were discussed in detail. The results showed that the density of the composites varied from 99.7% to 98.7%. 0.4–1.6 wt% of graphene was homogeneously distributed in the matrix. The structural stability of graphene was analyzed by Raman spectroscopy. The bending strength of the nanocomposite reached the maximum when graphene content was 0.4 wt%. The fracture toughness of the composites also increased when the addition of graphene was between 0.4 and 1.6 wt% as compared to monolithic alumina. Different types of toughening mechanisms were observed including; micro-cracks, graphene pull-out, crack deflection and crack bridging.

整体式Al ₂ O ₃和石墨烯增强的Al ₂ O ₃陶瓷陶瓷纳米复合材料是在火花等离子体烧结（SPS）的帮助下制造的。研究了烧结样品的密度，硬度，弯曲强度，断裂韧性和显微组织。石墨烯的含量为0-1.6％（重量）。详细讨论了复合材料的强化和增韧机理。结果表明，复合材料的密度在99.7％至98.7％之间。0.4–1.6 wt％的石墨烯均匀分布在基体中。通过拉曼光谱分析石墨烯的结构稳定性。当石墨烯含量为0.4wt％时，纳米复合材料的弯曲强度达到最大。当石墨烯的添加量与整体式氧化铝相比时，复合材料的断裂韧性也增加，当石墨烯的添加量在0.4至1.6wt％之间时。观察到不同类型的增韧机理，包括：微裂纹，石墨烯拉出，裂纹变形和裂纹桥接。