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Surface Modification of Alumina Powder to Prevent Exfoliation of Samples Fabricated by Gelcasting
A. Wieclaw-Midor, P. Wiecinska, M. Szafran
Warsaw University of Technology, Faculty of Chemistry, 3 Noakowskiego Street, 00 – 664 Warsaw, Poland
received January 31, 2018, received in revised form April 4, 2018, accepted April 28, 2018
Vol. 9, No. 3, Pages 225-234 DOI: 10.4416/JCST2018-00008
Abstract
The aim of this work was to study the influence of the Al2O3 surface modification 2-hydroxyethyl acrylate (HEA) on the properties of green and sintered ceramic bodies. As a reference, non-modified Al2O3 was used in the research. The modified Al2O3 powder was characterized with TEM and thermal analysis coupled with mass spectrometry. The rheological behaviour of slurries containing modified and non-modified alumina powder was measured, as well as the properties of green bodies. The proposed surface modification enables the production of green ceramic samples with homogeneous microstructure, high mechanical strength and high density. Sintered materials presented high density and favourable values for Vickers hardness. The obtained results showed that the presence of HEA on the powder surface partially prevents the negative effect of oxygen inhibition during gelcasting of alumina. Oxygen inhibition is a well-known problem in gelcasting but has still not been fully overcome for samples formed in an air atmosphere.
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Keywords
Gelcasting, surface modification, alumina, mechanical strength
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