流延制备有序排列石墨烯增韧氧化锆陶瓷的结构与力学性能

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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.

Key words： grapheme zirconia ordered arrangement tape casting mechanical properties microstructure ceramic toughening

Received: 24 December 2020 Published: 19 June 2020

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	CAI Weijin
	LI Qing
	LIU Yao
	LIU Shaojun

Cite this article:

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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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/104

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