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- Title
Electro-Sintering of Yttria-Stabilized Cubic Zirconia.
- Authors
Kim, Seung ‐ Wan; Kang, Suk ‐ Joong L.; Chen, I ‐ Wei; Lara ‐ Curzio, E.
- Abstract
Electro-sintering, i.e., electrically enhanced densification without the assistance of Joule heating, has been observed in 70% dense 8 mol% Y2 O3-stabilized ZrO2 ceramics at temperatures well below those for conventional sintering. Remarkably, full density can be obtained without grain growth under a wide range of conditions, including those standard for solid oxide fuel cell ( SOFS) and solid oxide electrolysis cell ( SOEC), such as 840°C with 0.15 A/cm2. Microstructure evidence and scaling analysis suggest that electro-sintering is aided by electro-migration of pores, made possible by surface flow of cations across the pore meeting lattice/grain-boundary counter flow of O2−. This allows pore removal from the anode/air interface and densification at unprecedentedly low temperatures. Shrinkage cracking caused by electro-sintering of residual pores is envisioned as a potential damage mechanism in SOFC/ SOEC 8 YSZ membranes.
- Subjects
SINTERING; ISOSTATIC pressing; CERAMICS; RESISTANCE heating; FUEL cells; ELECTROCHEMISTRY
- Publication
Journal of the American Ceramic Society, 2013, Vol 96, Issue 5, p1398
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/jace.12291