Consolidation of nanoparticle suspensions by centrifugation in non-porous moulds

Alumina and zirconia nanosuspensions with a mean particle size of 100nm and 15nm, respectively, were consolidated by centrifugal compaction in non-porous moulds. The nanosuspensions consolidated by high-speed centrifugation were deposited irregularly, resulting in a powder deposit with density profi...

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Bibliographic Details
Published inCeramics international Vol. 40; no. 6; pp. 7775 - 7782
Main Authors Trunec, Martin, Misak, Jiri
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.07.2014
Subjects
A. Suspensions
Aluminum oxide
Centrifugal compaction
Ceramics
Consolidation
D. Al2O3
D. ZrO2
Deposition
Deposits
Molds
Moulds
Nanostructure
D. Al2O3
A. Suspensions
Centrifugal compaction
D. ZrO2
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Summary:Alumina and zirconia nanosuspensions with a mean particle size of 100nm and 15nm, respectively, were consolidated by centrifugal compaction in non-porous moulds. The nanosuspensions consolidated by high-speed centrifugation were deposited irregularly, resulting in a powder deposit with density profile. The homogeneity of the powder deposits was described and homogeneous and well packed deposit regions were identified. Plate-like bodies were prepared from the homogeneous regions of the deposit. The advantage of regular and dense nanoparticle packing by centrifugal compaction was demonstrated by fabricating transparent alumina and tetragonal zirconia ceramics. The transparent alumina had an in-line transmission of 55% in the visible light at a thickness of 0.8mm. The transparent tetragonal zirconia reached a dense microstructure with an average grain size of 65nm and an in-line transmission of 25% at a thickness of 0.5mm.
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ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2013.12.120