Structure and mechanical properties of ordered graphene toughened zirconia ceramics prepared by tape casting
CAI Weijin1,2, LI Qing1, LIU Yao1, LIU Shaojun1
1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China; 2. Shenzhen Research Institute, Central South University, Shenzhen 518057, China
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·m0.5 to 7.21 MPa·m0.5, 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.
CAI Weijin,LI Qing,LIU Yao, et al. Structure and mechanical properties of ordered graphene toughened zirconia ceramics prepared by tape casting[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 104-111.
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2020, Vol. 25 
