【摘要】 采用流延成形与放电等离子烧结制备有序排列石墨烯纳米片（graphenenanosheets,GNS）增韧四方氧化锆多晶体（tetragonal zirconia polycrysta, TZP）陶瓷,研究石墨烯含量（体积分数,下同）对GNS/TZP陶瓷相组成、显微结构以及硬度与断裂韧性的影响,并进一步分析有序排列石墨烯TZP对陶瓷的增韧机制。结果表明:添加少量石墨烯可显著提高陶瓷的断裂韧性。添加0.25%石墨烯的氧化锆陶瓷断裂韧性提升幅度最大,从4.39 MPa·m^0.5提升至7.21 MPa·m^0.5,提升64.1%,硬度(HV₂₀)下降不到1%,为1 345.3。石墨烯在基体材料内平行有序排列,增韧氧化锆陶瓷的机理为以裂纹偏转为主,多种机制协同作用。更多还原

【Abstract】 Tetragonal zircona polycrysta（TZP） ceramics toughened by graphene nanosheets（GNS） were prepared by tape casting and spark plasma sintering. The effects of graphene content（volume fraction, the same below） on the phase composition, microstructure, hardness and fracture toughness of GNS/TZP ceramics were studied, and the toughening mechanism of ordered arrangement of graphene was further analyzed. The results show that,the addition of a small amount of graphene can significantly improve the fracture toughness of ceramics. The fracture toughness of zirconia ceramics with 0.25% graphene increases from 4.39 MPa·m^0.5 to 7.21 MPa·m^0.5, increased by 64.1%, and the hardness(HV₂₀) decreases to 1 345.3, dcreased by less than 1%. The mechanism of toughening zirconia ceramics is mainly crack deflection and synergistic with various mechanisms.更多还原