▎ 摘　　要

3 mol% yttria stabilized zirconia (3Y-TZP) with different contents of graphene nano-platelets (GNPs) powder mixture was produced by ball milling using dimethyl formamide as dispersion media. GNPs/3Y-TZP ceramics with full density were prepared by plasma activated sintering. The fabricating process, microstructure and mechanical properties of GNPs/3Y-TZP ceramics were investigated. Tetragonal phase is presented in all the sintered samples and GNPs are dispersed uniformly. The trans-granular becomes increasingly dominant by adding GNPs. The relative density of 3Y-TZP with 0.01% (mass content) GNPs is up to 99.4% and the hardness of that is 12.94 GPa. The fracture toughness achieves 15.3 MPa.m(1/2), wherein a 61% increase compared to 3Y-TZP ceramics without GNPs. The improvements of fracture toughness are mainly owing to grain refinement, micro-cracks, crack bridging and pulling out of GNPs.