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http://dx.doi.org/10.4191/kcers.2018.55.6.02

Microwave Sintering of Graphene-Nanoplatelet-Reinforced Al2O3-based Composites  

Ai, Yunlong (School of Material Science and Engineering, Nanchang Hangkong University)
Liu, Ying (School of Material Science and Engineering, Nanchang Hangkong University)
Zhang, Qiuyu (School of Material Science and Engineering, Nanchang Hangkong University)
Gong, Yuxing (School of Material Science and Engineering, Nanchang Hangkong University)
He, Wen (School of Material Science and Engineering, Nanchang Hangkong University)
Zhang, Jianjun (School of Material Science and Engineering, Nanchang Hangkong University)
Publication Information
Journal of the Korean Ceramic Society / v.55, no.6, 2018 , pp. 556-561 More about this Journal
Abstract
In this study, we performed a microwave sintering (MWS) of $Al_2O_3$ ceramic and $Al_2O_3$-based composites with nominal contents of graphene nanoplatelets (GPLs) of 0.2, 0.4, 0.6, and 0.8 vol%. The GPL dispersion in N-methyl pyrroleketone was optimized to deagglomerate the GPLs without damaging their structure. Dense composites were then obtained by MWS at $1500^{\circ}C$ for 30 min. The effects of different GPL contents on the phase compositions, microstructures, and mechanical properties of the composites were investigated. The microstructures of the composites became finer with the incorporation of the GPLs. The well-dispersed GPL fillers led to higher sintered densities in the composites. The optimal mechanical properties were achieved with 0.4 vol% GPLs. For this sample, the hardness, fracture toughness, and bending strength were $2000kgf/mm^2$, $6.19MPa{\cdot}m^{1/2}$, and 365.10 MPa, respectively. The addition of GPL could improve the microstructure of the $Al_2O_3$ ceramic and has potential to improve the fracture toughness of the ceramics.
Keywords
Microwave sintering; $Al_2O_3$-based composite; Graphene nanoplatelet; Microstructure; Mechanical properties;
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