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The dc electrical conductivity of single-crystal and polycrystalline alumina has been measured in the temperature range 600-1573 K using an apparatus designed to avoid errors due to extraneous conductance paths. Experimental data are presented which cast serious doubts on values published hitherto.

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The main objective of this work has been the deposition of Nickel (Ni)-Graphene nanoplatelets (GNPs) composites on a Ti-6Al-4V alloy substrate via a pulse current technique from a Watt's type bath. The characterization of the coatings was done by structural surveys, hardness measurements and wear tests. In this current work, XRD and SEM analysis demonstrated the better grained and compact property of the Ni-GNPs deposits. The surface roughness of the composite coatings was significantly decreased with the addition of GNPs. Furthermore, the addition of GNPs in the Ni matrix improved both hardness and wear behaviour of the composite coating compared to the pure Ni coating.