The effect of homogeneously dispersed few-layer graphene on microstructure and mechanical properties of Al2O3 nanocomposites

Fully dense few-layer graphene (FG)/Al2O3 nanocomposites, with homogeneously dispersed FG in the matrix, were prepared using a hetero-aggregation method followed by spark plasma sintering. The two-dimensional FG had the ability to restrain grain growth when compared with other inclusions and the mor...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2014-02, Vol.34 (2), p.443-451
Main Authors: Fan, Y, Estili, M, Igarashi, G, Jiang, W, Kawasaki, A
Format: Article
Language:English
Subjects:
Aluminum oxide
Dispersion
Elastic modulus
Graphene
Hardness
Modulus of elasticity
Nanocomposites
Sintering
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Summary:Fully dense few-layer graphene (FG)/Al2O3 nanocomposites, with homogeneously dispersed FG in the matrix, were prepared using a hetero-aggregation method followed by spark plasma sintering. The two-dimensional FG had the ability to restrain grain growth when compared with other inclusions and the morphology of the grains in the nanocomposites were modified by the addition of FG during densification compared with monolithic alumina. Due to the reduced grain size, the nanocomposites were almost as hard as monolithic alumina at a low sintering temperature (1573 K) even if the graphene content was as high as 1.2 vol%. However, at higher sintering temperatures (1673 K), the hardness of the nanocomposites decreased further but the change in the elastic modulus was limited. The decline in hardness and elastic modulus mainly arose from the sliding effect of FG, due to the low modulus of reduced graphene oxide in both in-plane and out-of-plane directions.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2013.08.035