Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

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Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders. / Ghanizadeh, Shaghayegh; Grasso, Salvatore; Ramanujam, Prabhu; Vaidhyanathan, Bala; Binner, Jon; Brown, Peter; Goldwasser, Judah.

In: Ceramics International, Vol. 43, No. 1, 01.2017, p. 275-281.

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Ghanizadeh, Shaghayegh ; Grasso, Salvatore ; Ramanujam, Prabhu ; Vaidhyanathan, Bala ; Binner, Jon ; Brown, Peter ; Goldwasser, Judah. / Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders. In: Ceramics International. 2017 ; Vol. 43, No. 1. pp. 275-281.

Bibtex

@article{4655dc981a40479aaa91811b4c0fd2f8,
title = "Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders",
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 min. These samples offered in-line transmittance values of up to ~80% and microhardness values of 22 GPa.",
author = "Shaghayegh Ghanizadeh and Salvatore Grasso and Prabhu Ramanujam and Bala Vaidhyanathan and Jon Binner and Peter Brown and Judah Goldwasser",
year = "2017",
month = jan,
doi = "10.1016/j.ceramint.2016.09.150",
language = "English",
volume = "43",
pages = "275--281",
journal = "Ceramics International",
issn = "0272-8842",
publisher = "Elsevier",
number = "1",

}

RIS

TY - JOUR

T1 - Improved transparency and hardness in α-alumina ceramics fabricated by high-pressure SPS of nanopowders

AU - Ghanizadeh, Shaghayegh

AU - Grasso, Salvatore

AU - Ramanujam, Prabhu

AU - Vaidhyanathan, Bala

AU - Binner, Jon

AU - Brown, Peter

AU - Goldwasser, Judah

PY - 2017/1

Y1 - 2017/1

N2 - 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 min. These samples offered in-line transmittance values of up to ~80% and microhardness values of 22 GPa.

AB - 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 min. These samples offered in-line transmittance values of up to ~80% and microhardness values of 22 GPa.

U2 - 10.1016/j.ceramint.2016.09.150

DO - 10.1016/j.ceramint.2016.09.150

M3 - Article

VL - 43

SP - 275

EP - 281

JO - Ceramics International

JF - Ceramics International

SN - 0272-8842

IS - 1

ER -