Title: Densification of alumina by SPS and HP: A comparative study
Authors: Demuynck, Maryse ×
Erauw, Jean-Pierre
Van der Biest, Omer
Delannay, Francis
Cambier, Francis #
Issue Date: Jul-2012
Publisher: Elsevier Science Publishers
Series Title: Journal of the European Ceramic Society vol:32 issue:9 pages:1957-1964
Abstract: In this study, the densification of alumina by spark plasma sintering (SPS) was investigated and compared to conventional hot pressing. It was shown that SPS is very effective in the sintering of alumina leading to higher densities and allows to work at lower temperatures and with shorter sintering cycles. The effect of the heating rate is dependent on the heating mode (SPS or HP). The identification of active sintering mechanisms was attempted by an isothermal and an anisothermal methods, showing that other mechanisms probably related to electrical effects enhance the densification. We suggest the higher contribution of surface diffusion mainly during the initial stage of sintering and an influence of the presence of impurities segregated at the grain boundaries. They could create conductive layers and also introduce ions with a lower valence than Al3+; defects are created in the surface layers and the diffusion of the species is increased. (C) 2011 Elsevier Ltd. All rights reserved.
ISSN: 0955-2219
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Surface and Interface Engineered Materials
× corresponding author
# (joint) last author

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