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Journal article

Rheological analysis of stabilized cerium-gadolinium oxide (CGO) dispersions

From

Department of Energy Conversion and Storage, Technical University of Denmark1

Ceramic Engineering & Science, Department of Energy Conversion and Storage, Technical University of Denmark2

Applied Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark3

Secretariat, IT, Department of Energy Conversion and Storage, Technical University of Denmark4

The objective of the present work is to generate general rheological criteria to investigate high solid loading dispersions suitable for the shaping of homogeneous ceramic bodies. Systematic analysis of the rheological properties of moderately low specific surface area (SSA) Ce0.9Gd0.1O3-δ (CGO10) dispersions was performed in rotational and oscillatory modes.

The dispersant content was optimized to attain fully stabilized dispersions. A critical upper limit for the ceramic content was introduced and denoted ϕh. It defines the limit to non-Newtonian flow and corresponds to the highest feasible volume fraction to which reproducible dispersions are achieved.

The method proposed for its determination is based on the analysis of the flow index as function of the ceramic volume fraction. For the CGO dispersions formulated in this work, ϕh was found to be around (0.34 ± 0.04). The maximum volume fraction (ϕm) was also estimated and found to be (0.55 ± 0.01).

Language: English
Year: 2014
Pages: 695-702
ISSN: 1873619x and 09552219
Types: Journal article
DOI: 10.1016/j.jeurceramsoc.2013.09.022
ORCIDs: Marani, Debora , Hjelm, Johan and Wandel, Marie

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