The Microstructure and Conductivity Evolution of Plasma-Sprayed (Mn, Co)3O4 Spinel Coatings during Conductivity Measurements at Elevated Temperature
نویسندگان
چکیده
(Mn, Co)3O4 spinel is widely used to protect the metallic interconnect of solid oxide fuel cells while it suffers deoxidization during preparation by plasma spray. This work was proposed study effect spray parameters on microstructure and conductivity coatings. In this work, coatings were prepared atmospheric The heated up 700 °C held for 15 h allow evolution. composition characterized scanning electron microscopy (SEM), transmission (TEM), X-ray diffraction (XRD) photoelectron spectrum (XPS). results show that all evidently densified in two hours heating measured conductivities continuously evolved. phase found contributed more evolutions than densification. conversion CoO MnCo2O4 observed thus endowed a 40 S/cm. A high fraction Co3+ peaks, amount Mn2+ low content Co2+ jointly showed occupied B site AB2O4 stood at site, indicating stoichiometric MnCo2O4. Annealing twins detected TEM EBSD but only limited contribution evolution considered. Finally, we suggest flowrate gas input energy prepare with designed conductivity.
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ژورنال
عنوان ژورنال: Coatings
سال: 2021
ISSN: ['2079-6412']
DOI: https://doi.org/10.3390/coatings11050533