Fabrication and properties of in situ reduced graphene oxide‐toughened zirconia composite ceramics

Graphene oxide and zirconia powders were mixed using a colloidal coating route. In situ reduced graphene oxide‐toughened zirconia ceramics were prepared by spark plasma sintering. Their microstructure, mechanical properties, and toughening mechanisms were investigated. The results show that graphene...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2018-08, Vol.101 (8), p.3498-3507
Main Authors: Zeng, Zhaoyubo, Liu, Yunzhong, Chen, Weiping, Li, Xiaoqiang, Zheng, Qifan, Li, Kaili, Guo, Ruiran
Format: Article
Language:English
Subjects:
Ceramic coatings
Ceramic powders
Ceramics
composites
Fracture toughness
Graphene
graphene oxide
Mechanical properties
Plasma sintering
Spark plasma sintering
Substrates
Toughening
toughening and toughness
Yttrium oxide
zirconia
Zirconium dioxide
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Summary:Graphene oxide and zirconia powders were mixed using a colloidal coating route. In situ reduced graphene oxide‐toughened zirconia ceramics were prepared by spark plasma sintering. Their microstructure, mechanical properties, and toughening mechanisms were investigated. The results show that graphene oxide can be easily reduced in situ during sintering and that it disperses homogeneously within the zirconia substrate. Compared with the toughness of 3 mol.% yttria‐stabilized zirconia, the fracture toughness of in situ reduced graphene oxide‐toughened zirconia increased by up to 175% (from ~6.07 to ~10.64 MPa·m1/2) at 0.09 wt.% graphene oxide with a small increase in hardness. The improvement is more significant than that of prereduced graphene oxide‐toughened cases, and it is associated with the formation of a C‐O‐Zr bond at the interface in addition to conventional toughening mechanisms.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15483