Lee, Sung-Il Hong, Jongsup Kim, Hyoungchul Son, Ji-Won Lee, Jong-Ho Kim, Byung-Kook Lee, Hae-Weon Yoon, Kyung Joong 2024-01-20T08:34:42Z 2024-01-20T08:34:42Z 2021-09-04 2014-10 0013-4651 https://pubs.kist.re.kr/handle/201004/126279 The major degradation issues of solid oxide fuel cells (SOFC) are associated with the oxide scale growth and Cr evaporation of the metallic interconnect. To address these challenges, a highly dense spinel oxide coating was fabricated on a ferritic stainless steel interconnect using a cost-competitive ceramic processing route. The nano-scale Mn1.5Co1.5O4 spinel powder was synthesized using a glycine-nitrate method, and the particle agglomerates were effectively disintegrated by a high-energy attrition milling process. The spinel protective coating, which was applied by screen printing, was sintered to a nearly full density, without causing damage to the metallic substrate, by a high-temperature annealing process in a reducing environment, followed by re-oxidation at a moderate temperature. The dense spinel coating remarkably reduced the growth rate of chromia scale and restrained the evaporation of chromium species, as verified by area specific resistance (ASR) measurements and analysis on chromium distribution over the cross-section. Strong adhesion between the coating and substrate was confirmed after 500-hour operation. The sintering mechanism involved in reduction-oxidation heat-treatment was studied based on dilatometry measurements and microstructural features. The implication of the ASR change and the chromium migration for stability of practical SOFC stacks was discussed in detail. (C) The Author(s) 2014. Published by ECS. All rights reserved. English ELECTROCHEMICAL SOC INC Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells Article 10.1149/2.0541414jes 1 JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.161, no.14, pp.F1389 - F1394 JOURNAL OF THE ELECTROCHEMICAL SOCIETY 161 14 F1389 F1394 N scie scopus 000345975500089 2-s2.0-84923545286 Electrochemistry Materials Science, Coatings & Films Electrochemistry Materials Science Article ELECTRICAL-CONDUCTIVITY LAYERS FERRITIC STAINLESS-STEELS AREA-SPECIFIC RESISTANCE CHROMIA-FORMING ALLOY CROFER 22 APU SOFC INTERCONNECT OXIDATION BEHAVIOR ELECTROPHORETIC DEPOSITION THIN-FILMS Protective coating Metallic interconnect Spinel Solid oxide fuel cell Sintering