Graphene reinforced alumina nano-composites

Porwal, Harshit, Tatarko, Peter, Grasso, Salvatore, Khaliq, Jibran, Dlouh, Ivo and Reece, Mike (2013) Graphene reinforced alumina nano-composites. Carbon, 64. 359 - 369. ISSN 0008-6223

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Abstract

Graphene was prepared using liquid phase exfoliation and dispersed in an alumina matrix using an ultrasonication and powder processing route. Al2O3–graphene composites with up to 5 vol% content were densified (>99%) using SPS. The fracture toughness of the material increased by 40% with the addition of only 0.8 vol% graphene. However for higher graphene contents the improvement in fracture toughness was limited. Graphene changed the mechanism of crack propagation for the alumina matrix from inter-granular to trans-granular. The formation of an inter-connecting graphene network promoted easy fracture for concentration ⩾2 vol%. Elastic modulus remained nearly constant for up to 2 vol% and decreased significantly for 5 vol% due to the formation of the inter-connecting graphene network. Fracture toughness measured with the indentation and chevron notch methods were consistent up to 2 vol% and at 5 vol% the percolating network of graphene resulted in easy crack propagation with significant discrepancy between the results for the two methods.

Item Type:	Article
Subjects:	F100 Chemistry F200 Materials Science F300 Physics H300 Mechanical Engineering
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Dr Jibran Khaliq
Date Deposited:	25 Sep 2017 10:22
Last Modified:	12 Oct 2019 20:41
URI:	http://nrl.northumbria.ac.uk/id/eprint/31948

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