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Effect of High Pressure Spark Plasma Sintering on the Densification of a Nb-Doped TiO2 Nanopowder

Authors :
Alexandre Verchère
Sandrine Cottrino
Gilbert Fantozzi
Shashank Mishra
Thomas Gaudisson
Nicholas Blanchard
Stéphane Pailhès
Stéphane Daniele
Sylvie Le Floch
Source :
Ceramics, Vol 3, Iss 4, Pp 507-520 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Sintering under pressure by means of the spark plasma sintering (SPS) technique is a common route to reduce the sintering temperature and to achieve ceramics with a fine-grained microstructure. In this work, high-density bulk TiO2 was sintered by high pressure SPS. It is shown that by applying high pressure during the SPS process (76 to 400 MPa), densification and phase transition start at lower temperature and are accelerated. Thus, it is possible to dissociate the two densification steps (anatase then rutile) and the transition phase during the sintering cycle. Regardless of the applied pressure, grain growth occurs during the final stage of the sintering process. However, twinning of the grains induced by the phase transition is enhanced under high pressure resulting in a reduction in the crystallite size.

Details

Language :
English
ISSN :
25716131
Volume :
3
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Ceramics
Publication Type :
Academic Journal
Accession number :
edsdoj.f6b78757e8a8432095fc6cc1bdf2f4e7
Document Type :
article
Full Text :
https://doi.org/10.3390/ceramics3040041