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Dispersion of Carbon Nanotubes in Alumina Using a Novel Mixing Technique and Spark Plasma Sintering of the Nanocomposites with Improved Fracture Toughness

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Abstract:

The present study emphasizes on the fabrication of carbon nanotubes (CNTs) reinforced alumina nanocomposites for structural applications. A new technique for the mixing and dispersion of CNTs in alumina powder was employed. Spark plasma sintering (SPS) technique was used for the fabrication of nanocomposites with varying amounts of as-received CNTs (1, 2 and 3 weight %) in alumina matrix. Densification behavior, hardness and fracture toughness of the nanocomposites were studied. A comparison of mechanical properties of the desired nanocomposites was presented. An improvement in fracture toughness of approximately 14% at 1 wt% CNT-alumina nanocomposite over monolithic alumina compacts was observed due to better dispersion of CNTs in alumina matrix that ultimately helped in grain growth suppression to provide finer grain in the nanocomposites. The fractured surfaces also revealed the presence of CNTs bridging and pull out that aided in the improvement of mechanical properties. The synthesized samples were characterized using field emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy, densification, Vickers hardness testing and fracture toughness measurements.

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Periodical:

Advances in Science and Technology (Volume 89)

Pages:

76-81

DOI:

https://doi.org/10.4028/www.scientific.net/AST.89.76

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Online since:

October 2014

Authors:

Nabi Bakhsh*, Fazal Ahmad Khalid, Abbas Hakeem, Tahar Laoui

Keywords:

Fracture Toughness, Mechanical Characterization, Nanocomposite, SPS

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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