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Journal Articles Journal of the European Ceramic Society Year : 2016

Anisotropic mechanical and functional properties of graphene-based alumina matrix nanocomposites

Abstract

Graphene platelets (GPLs) containing Al2O3 nanocomposites, which exhibit anisotropic microstructure,have been prepared by spark plasma sintering (SPS), and effects of this anisotropy on mechanical, elec-trical and thermal properties of the nanocomposites have been investigated. 3 vol.% GPLs addition intomonolithic Al2O3caused fracture toughness (Kıc) to increase by 26.7% in the in-plane direction and todecrease by 17.2% in the through thickness direction. Kıcstarted to decrease in the in-plane direction andto increase in the through-thickness direction with further increase in the GPLs amount. The electricalconductivity of the nanocomposites exhibited a slight anisotropy with a lower resistivity in the in-planedirection. Oriented GPLs also led to a less resistive heat conduction path in the in-plane direction. ∼44% increase in the in-plane thermal conductivity was achieved at 600°C with 15 vol.% GPLs addition into themonolithic Al2O3and this resulted in ∼52% increase in the k in-plane/k through-thickness ratio
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Dates and versions

hal-01451008 , version 1 (31-01-2017)
hal-01451008 , version 2 (21-02-2017)

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Yasemin Çelik, Ali Çelik, Emmanuel Flahaut, Ender Suvaci. Anisotropic mechanical and functional properties of graphene-based alumina matrix nanocomposites. Journal of the European Ceramic Society, 2016, 36 (8), pp. 2075-2086. ⟨10.1016/j.jeurceramsoc.2016.02.032⟩. ⟨hal-01451008v2⟩
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