Constrained sintering kinetics of 3YSZ films

3YSZ green layers approximately 10 μm thick were screen-printed onto 3YSZ substrates and their constrained sintering kinetics were measured at 1100–1350 °C using an optical dilatometer. The densification rates of the same powder in the form of pellets and free-standing films were also measured. The...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 31; no. 13; pp. 2231 - 2239
Main Authors Kim, Jung-Sik, Rudkin, Robert A., Wang, Xin, Atkinson, Alan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2011
Subjects
Ceramics
Constraints
Densification
Density
Dilatometry
Fuel cells
Pellets
Porosity
Sintering
Sintering (powder metallurgy)
ZrO 2
ZrO 2
Porosity
Films
Sintering
Fuel cells
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Summary:3YSZ green layers approximately 10 μm thick were screen-printed onto 3YSZ substrates and their constrained sintering kinetics were measured at 1100–1350 °C using an optical dilatometer. The densification rates of the same powder in the form of pellets and free-standing films were also measured. The constrained densification rate was greatly retarded compared with the free densification rate at a given temperature and density. The retardation increased with increasing density and temperature and could not be properly accounted for by existing theories of constrained sintering. As a result the apparent activation energy is much lower for constrained sintering (135 ± 20 kJ mol −1) than for free sintering (660 ± 30 kJ mol −1). It is proposed that this is because the constrained microstructure exhibits larger and more widely separated pores at the higher temperatures.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2011.05.044