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Plasma Spraying of Lanthanum Chromite Films for Solid Oxide Fuel Cell Interconnection Application
Author(s) -
Kuo Lewis J. H.,
Vora Shailesh D.,
Singhal Subhash C.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02871.x
Subject(s) - materials science , solid oxide fuel cell , aluminate , thermal spraying , oxide , interconnection , agglomerate , chemical engineering , lanthanum , plasma , mineralogy , metallurgy , coating , composite material , inorganic chemistry , chemistry , cement , computer network , physics , electrode , quantum mechanics , computer science , anode , engineering
This paper discusses a novel plasma‐spraying process for depositing dense LaCrO 3 ‐based interconnection for solid oxide fuel cells (SOFCs). Calcium aluminate was mixed with LaCrO 3 in a slurry containing PVA binder and spray dried to form free‐flowing agglomerates. These free‐flowing agglomerates were plasma sprayed onto a porous substrate of doped LaMnO 3 and then heat‐treated to form a gas‐tight and electrically conducting interconnection. Samples of the plasma‐sprayed interconnection were characterized for morphology, phase constituents, and coefficient of thermal expansion, as well as electrical resistivity and oxygen nonstoichiometry at 1000°C in the P O 2 range from 1 to} 1× 10 ‐16 atm. The calcium aluminate additive was found to facilitate densification of the interconnection, most likely through the formation of low‐temperature melting phase(s) in the system Ca–Cr–Al–O. A SOFC with such a plasma‐sprayed interconnection was fabricated and electrically tested. This cell exhibited good electrical performance, and the interconnection was stable under fuel cell operation conditions.