Influence of porosity on densification and grain growth kinetics of Ce0.9Gd0.1O1.95 tape

De Wei Ni, Vincenzo Esposito, Søren Preben Vagn Foghmoes, Severine Ramousse, Nini Pryds

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

Gadolinium doped-ceria (CGO) is an important material that offers high stability, tolerance against harsh environments and high ionic and electronic conductivity at high temperatures. For most of its applications, CGO is applied as a thin dense layer on a porous support structure. However, highly porous layer allowing gas flow is necessary in catalytic and in gas purification devices. During the sintering with shrinkage, the total solid volume is maintained to be a constant value but the shape and size of each particle change with the formation of grain boundaries. This change in solid particles is accompanied by the change of shape, size and fraction of pores in a given volume. Therefore, porosity can be treated as an extra phase during sintering study. In this work, we presented the densification and grain growth behaviour of Ce0.9Gd0.1O1.95 tape cast layers with different percentage of porosity. The emphasis was put on the effect of porosity on densification and grain growth kinetics. Derived from the sintering constitutive laws, the densification and grain growth kinetics were experimentally characterized and analyzed. Furthermore, the activation energies for viscous flow were determined from master viscosity curves, which are comparable to the kinetic values obtained from densification and grain growth. It is indicated that porosity has negligible effect on densification kinetics, but high porosity decreases the chance of particle contact, and grain boundary mobility is therefore slowed, which leads to slower grain growth.

Original languageEnglish
Publication date2013
Publication statusPublished - 2013
Event 13th International Conference of the European Ceramic Society - Ester Technopole, Limoges, France
Duration: 23 Jun 201327 Jun 2013
Conference number: 13
http://www.ecers2013.fr/events.php?IDManif=707&IDModule=71&IDRub=368

Conference

Conference 13th International Conference of the European Ceramic Society
Number13
LocationEster Technopole
CountryFrance
CityLimoges
Period23/06/201327/06/2013
Internet address

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