Lanthanum Strontium Cobaltite-Alumina Fiber Composite Contact Material for Solid Oxide Fuel Cells

Short alumina fibers were added to LSCo contact material to enhance the contact strength and improve thermal cycle stability. Alumina fiber from 2.5 v% to 20 v% were mixed with LSCo and sintered at elevated temperatures. Sintering study showed retardation in densification of LSCo matrix with increas...

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Bibliographic Details
Published inECS transactions Vol. 103; no. 1; pp. 1835 - 1846
Main Authors Chou, Yeong-Shyung, Jin, Tongan, Canfield, Nathan L, Bonnett, Jeff, Choi, Jung Pyung, Hardy, John S
Format Journal Article
LanguageEnglish
Published 09.07.2021
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Summary:Short alumina fibers were added to LSCo contact material to enhance the contact strength and improve thermal cycle stability. Alumina fiber from 2.5 v% to 20 v% were mixed with LSCo and sintered at elevated temperatures. Sintering study showed retardation in densification of LSCo matrix with increasing alumina content. Sintered bulk strength exhibited similar behavior where strength greatly reduced at high alumina v%. Coefficient of thermal expansion showed consistent results with prediction from rule of mixture. Contact strength using anode supported YSZ bilayer coupons improved greatly with the presence of small amount (2.5-5 v%) alumina fibers and no substantial reduction after 10 deep thermal cycles. Candidate LSCo-Al 2 O 3 contact materials was validated in a generic stack test fixture for 1000h at 800 o C followed by 10 thermal cycles. Results of impedance analysis showed substantial improvement in thermal cycle stability as compared to LSCo parent materials.
ISSN:1938-5862
1938-6737
DOI:10.1149/10301.1835ecst