Optimization of sintering conditions for improved microstructural and mechanical properties of dense Ce0.8Gd0.2O2-δ-FeCo2O4 oxygen transport membranes

F. Zeng*, Jürgen Malzbender, Stefan Baumann, Arian Nijmeijer, Louis Winnubst, Mirko Ziegner, Olivier Guillon, Ruth Schwaiger, Willi Meulenberg

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

Ce0.8Gd0.2O2-δ-FeCo2O4 composite is an excellent oxygen transport membrane material with good chemical stability for applications in oxygen separation and membrane reactors. To improve microstructural and mechanical properties, sintering profiles for Ce0.8Gd0.2O2-δ-FeCo2O4 composites were optimized. Different sintering temperatures are selected based on our study of phase interactions among the initial powder mixtures using high-temperature X-ray diffraction. The results reveal that the phase interaction at ∼1050 ℃ accelerates densification process, and a further increase of sintering temperature to 1200 ℃ contributes to the homogenization of the pore distribution. A higher density and an improved homogeneity of pore distribution result in enhanced mechanical strength. However, the density decreases once the sintering temperature reaches 1350 ℃. Hence, the optimal sintering temperature considering both microstructural and mechanical properties appears to be 1200 ℃. Sintering at this temperature results in a microstructure with a density exceeding 99 % with only small surface defects and a high average flexural strength of approximately 266 MPa.
Original languageEnglish
Pages (from-to)509-516
Number of pages8
JournalJournal of the European Ceramic Society
Volume41
Issue number1
Early online date8 Sep 2020
DOIs
Publication statusE-pub ahead of print/First online - 8 Sep 2020

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