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Characterization of GNP-Containing Al2O3 Nanocomposites Fabricated via High Frequency-Induction Heat Sintering Route

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Abstract

In this paper, we present alumina (Al2O3) nanocomposites reinforced with various graphene nanoplatelets (GNPs) concentrations (0.75 and 1.25 wt.%) and fabricated by rapid high frequency-induction heat (HF-IH) sintering route. The influence of the GNP on the microstructures, mechanical properties, and interfacial connections of the resulting nanocomposites were thoroughly investigated. GNPs were synthesized using combined chemical oxidation and thermal exfoliation processes and dispersed homogenously into base Al2O3 ceramic matrix using colloidal chemistry technique. Pressure-assisted HF-IH sintering rapidly consolidated nanocomposites close to theoretical densities (~99%) without damaging the GNP intrinsic nanostructures and electron microscopy revealed firmly bonding of the nanocomposite constituents at interfaces. Nanocomposite samples containing 0.75 wt.% GNP demonstrated 60% finer microstructure with 45% higher fracture toughness (K IC) and 9% improvement in hardness against benchmarked monolithic Al2O3. However, nanocomposites loaded with higher GNP contents (1.25 wt.%) showed deprived properties due to GNP accumulations. Homogenous dispersions and two-dimensional features allowed GNP to interact wide area of the matrix grains thus refined the microstructure and gave rise the grain anchoring mechanism thereby led nanocomposite to superior mechanical properties following GNP crack-bridging and pull-out toughening mechanisms.

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Acknowledgments

The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding of this research through the Research Group Project No. RGP-VPP-283.

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Authors and Affiliations

  1. Deanship of Scientific Research, Advanced Manufacturing Institute, King Saud University, P.O. Box. 800, Riyadh, 11421, Kingdom of Saudi Arabia

    Iftikhar Ahmad & Mohammad Islam

  2. Composite Research Center, Department of Materials Science and Engineering, Institute of Space Technology, Islamabad, Pakistan

    Tayyab Subhani

  3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, UK

    Yanqiu Zhu

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  1. Iftikhar Ahmad
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Correspondence to Iftikhar Ahmad.

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Ahmad, I., Islam, M., Subhani, T. et al. Characterization of GNP-Containing Al2O3 Nanocomposites Fabricated via High Frequency-Induction Heat Sintering Route. J. of Materi Eng and Perform 24, 4236–4243 (2015). https://doi.org/10.1007/s11665-015-1738-0

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