Abstract
A wet powder spraying (WPS) method was applied to prepare protective layers of manganese cobalt spinel oxide (MCO) on commercial stainless steels of solid oxide fuel cell (SOFC) interconnects. Densification of the MCO layer was dependent on the thermal treatment condition in which a reactive sintering increased the coating density. An applied MnO sublayer reacted with the MCO layer during sintering, and resulted in secondary phase formation and limited densification. Both MCO and MnO-MCO coatings were adhering to the steel substrates and suppressed chromium diffusion during oxidation. The area specific resistance (ASR) of a test specimen including the MCO layer was 0.03 Ωcm2 at 700°C after 800 h, lower than with MnO-MCO, which is believed to be due to the denser protective layer of the single phase and more limited chromia scale growth. Thus, an effective protective layer of metallic interconnects could be prepared using a simple wet coating method after optimization of the sintering conditions.
Original language | English |
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Title of host publication | Solid Oxide Fuel Cells 14, SOFC 2015 |
Publisher | Electrochemical Society Inc. |
Pages | 1581-1587 |
Number of pages | 7 |
Volume | 68 |
Edition | 1 |
ISBN (Electronic) | 9781607685395 |
DOIs | |
Publication status | Published - 2015 |
Event | 14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage - Glasgow, United Kingdom Duration: 26 Jul 2015 → 31 Jul 2015 |
Conference
Conference | 14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage |
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Country/Territory | United Kingdom |
City | Glasgow |
Period | 26/07/15 → 31/07/15 |
Keywords
- SOFC
- protective coatings
- interconnects
ASJC Scopus subject areas
- Engineering(all)