Chemical and structural analyses of the graphene nanosheet/alumina ceramic interfacial region in rapidly consolidated ceramic nanocomposites

Ahmad, Iftikhar, Islam, Mohammad, Alharthi, Nabeel, Alawadhi, Hussain, Subhani, Tayyab, Munir, Khurram, Shah, Syed Ismat, Inam, Fawad and Zhu, Yanqiu (2017) Chemical and structural analyses of the graphene nanosheet/alumina ceramic interfacial region in rapidly consolidated ceramic nanocomposites. Journal of Composite Materials. ISSN 0021-9983 (In Press)

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Official URL: http://dx.doi.org/10.1177/0021998317708235

Abstract

Graphene nanosheets (GNS) reinforced Al2O3 nanocomposites were prepared by a rapid sintering route. The microhardness and fracture toughness values of the resulting nanocomposites simultaneously increased due to efficient graphene nanosheet incorporation and chemical interaction with the Al2O3 matrix grains. The properties enhancement is attributed to uniformly dispersed graphene nanosheet in the consolidated structure promoted by high surface roughness and ability of graphene nanosheet to decorate Al2O3 nanoparticles, strong GNS/Al2O3 chemical interaction during colloidal mixing and pullout/crack bridging toughening mechanisms during mechanical testing. The GNS/Al2O3 interaction during different processing stages was thoroughly examined by thermal and structural investigation of the interfacial area. We report formation of an intermediate aluminum oxycarbide phase via a confined carbothermal reduction reaction at the GNS/Al2O3 interface. The graphene nanosheet surface roughness improves GNS/Al2O3 mechanical attachment and chemical compatibility. The Al2O3/GNS interface phase facilitates efficient load transfer, thus delaying failure through impediment of crack propagation. The resulting nanocomposites, therefore, offer superior toughness.

Item Type: Article
Uncontrolled Keywords: Ceramics, composites, interfaces, nanostructures, electron microscopy
Subjects: F200 Materials Science
H300 Mechanical Engineering
H900 Others in Engineering
J300 Ceramics and Glasses
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Fawad Inam
Date Deposited: 05 Jun 2017 10:12
Last Modified: 05 Jun 2017 10:12
URI: http://nrl.northumbria.ac.uk/id/eprint/30940

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