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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/22852

Title: Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders
Authors: Ghanizadeh, Shaghayegh
Grasso, Salvatore
Ramanujam, Prabhu
Vaidhyanathan, Bala
Binner, J.G.P.
Brown, Peter M.
Goldwasser, Judah
Keywords: Nanocrystalline
Alumina
SPS
Hot press
Transparent
Issue Date: 2017
Publisher: © Elsevier
Citation: GHANIZADEH, S. ...et al., 2017. Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders. Ceramics International, 43 (1), Part A, pp. 275-281.
Abstract: Nanocrystalline alumina powder with an average crystallite size of ≤50 nm has been consolidated by spark plasma sintering (SPS) and hot pressing (HP) with a view to achieving dense, fine grained alumina bodies that display transparency. When as-synthesised powder was densified directly, excessive grain growth resulted from both the SPS and HP techniques and hence a large final grain size was observed. Attempts to improve the uniformity of the green microstructure prior to densification were unsuccessful when spray freeze dried granules were used, whether pre-pressed into a compact or not. The use of 53% dense slip cast green compacts, however, enabled final density of ~99.96% and a mean grain size of ~0.32 μm to be achieved when SPS conditions of 1200˚C and 500 MPa were applied for 20 minutes. These samples offered in-line transmittance values of up to ~80% and microhardness values of 22 GPa.
Description: This paper is in closed access until 22nd Sept 2017.
Version: Accepted for publication
DOI: 10.1016/j.ceramint.2016.09.150
URI: https://dspace.lboro.ac.uk/2134/22852
Publisher Link: http://dx.doi.org/10.1016/j.ceramint.2016.09.150
ISSN: 1873-3956
Appears in Collections:Closed Access (Materials)

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