TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

Development and application of HVOF sprayed spinel protective coating for SOFC interconnects

Tutkimustuotosvertaisarvioitu

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut631-639
Sivumäärä9
JulkaisuJournal of Thermal Spray Technology
Vuosikerta22
Numero5
DOI - pysyväislinkit
TilaJulkaistu - kesäkuuta 2013
OKM-julkaisutyyppiA2 Katsausartikkeli

Tiivistelmä

Protective coatings are needed for metallic interconnects used in solid oxide fuel cell (SOFC) stacks to prevent excessive high-temperature oxidation and evaporation of chromium species. These phenomena affect the lifetime of the stacks by increasing the area-specific resistance (ASR) and poisoning of the cathode. Protective MnCo2O4 and MnCo1.8Fe 0.2O4 coatings were applied on ferritic steel interconnect material (Crofer 22 APU) by high velocity oxy fuel spraying. The substrate-coating systems were tested in long-term exposure tests to investigate their high-temperature oxidation behavior. Additionally, the ASRs were measured at 700 C for 1000 h. Finally, a real coated interconnect was used in a SOFC single-cell stack for 6000 h. Post-mortem analysis was carried out with scanning electron microscopy. The deposited coatings reduced significantly the oxidation of the metal, exhibited low and stable ASR and reduced effectively the migration of chromium.