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De-densification mechanisms of yttria-doped cerium oxide during sintering in a reducing atmosphere

hal.structure.identifierDépartement de recherche sur les procédés pour la mine et le recyclage du combustible [DMRC]
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHAMBON, Cébastien
hal.structure.identifierDépartement de recherche sur les procédés pour la mine et le recyclage du combustible [DMRC]
dc.contributor.authorVAUDEZ, Stéphane
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorHEINTZ, Jean-Marc
dc.date.issued2018-11
dc.identifier.issn0002-7820
dc.description.abstractEnThe presence of residual carbon in oxides in which the valence state can change during sintering may lead to de‐densification or swelling phenomena during the last stage of sintering. This was demonstrated by sintering a Ce0.85Y0.15O2‐x powder compact with or without added graphite carbon in a reducing atmosphere (Ar/5 vol.% H2) at 1450°C. The shrinkage behavior was studied with a dilatometer combined with an oxygen probe and a gas chromatograph to analyze the composition of the released gases. Oxide reduction during sintering leads to a significant release of oxygen. This oxygen can react with carbon to form gaseous species such as CO. These gases can be released during the second stage of sintering, that is, when the porosity is still open, but they can be trapped in the closing pores during the final stage of sintering. This causes the pressure to increase in the pores, resulting in irreversible swelling, cracking and eventually pellet fracture.
dc.language.isoen
dc.publisherWiley
dc.title.enDe-densification mechanisms of yttria-doped cerium oxide during sintering in a reducing atmosphere
dc.typeArticle de revue
dc.identifier.doi10.1111/jace.15741
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the American Ceramic Society
bordeaux.page4956-4967
bordeaux.volume101
bordeaux.issue11
bordeaux.peerReviewedoui
hal.identifierhal-01880728
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01880728v1
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