Towards large scale preparation of graphene in molten salts and its use in the fabrication of highly toughened alumina ceramics
Kamali, Ali Reza
Royal Society of Chemistry
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Kamali, A. R., Feighan, J., & Fray, D. (2016). Towards large scale preparation of graphene in molten salts and its use in the fabrication of highly toughened alumina ceramics. Faraday Discussions https://www.repository.cam.ac.uk/handle/1810/253684
Highly crystalline graphene nanosheets were reproducibly generated by the electrochemical exfoliation of graphite electrodes in molten LiCl containing protons. The graphene product has been successfully applied in several applications. This paper discusses the effect of molten salt produced graphene on the microstructure and mechanical properties of alumina articles produced by slip casting and pressureless sintering, wich is one of the most convenient methods used for the commercial production of alumina ceramics. Apart from graphene, graphite powder and multi-walled carbon nanotubes (CNTs) were also used in the preparation for comparison. The strengthening effect of graphene was realized by the microstructural refinement and by influencing the formation of alumina nanorods during sintering of α-Al2O3 articles. The fracture toughness of the sintered alumina articles increased to an impressive value of 6.98 MPa m1/2 by adding 0.5wt% graphene nanosheets. It was attributed to the unique microstructure obtained comprising of micrometer sized alumina grains separated by alumina nanorods.
The Worshipful Company of Armourers and Brasiers is thanked for funding support for this research.
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253684