Development and Comparison of Field Assisted Sintering Techniques to Densify CeO2 Ceramics

Robert Harrison, Jonathan Morgan, James Buckley, Samira Bostanchi, C. Green, R. White, D. Pearmain, Timothy Abram, D. T. Goddard, N. J. Barron

Research output: Contribution to journalArticlepeer-review

Abstract

Cerium dioxide (CeO2) was densified by conventional and field assisted sintering techniques in order to examine the effect of a range of sintering parameters on the resultant pellet microstructure, namely: temperature, hold time, atmosphere, electric field strength and polarity. CS at 1400C for 2 hours in static air atmospheres provided the highest densities and grain sizes compared with an argon atmosphere, due to the retention of near stoichiometry maintaining sintering kinetics. SPS produced dense ceramics at similar sintering temperatures (1300C), but with greatly reduced sintering hold (5 minutes) and cycle times. However, microstructural inhomogeneity arose from the direct current polarity which led to oxygen ion diffusion toward the positive electrode. FS was performed with an alternating current electric field and produces samples of comparable density at sintering temperatures of ~1100C for a hold time of around 1 hour with no inhomogeneity due to the alternating current employed.
Original languageEnglish
Pages (from-to)6599-6607
JournalEuropean Ceramic Society. Journal
Volume42
Issue number14
Early online date1 Jul 2022
DOIs
Publication statusPublished - 13 Aug 2022

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