Thermal stability of atmospheric plasma sprayed (Ni, Cu, Co)-YSZ and Ni-Cu-Co-YSZ anodes cermets for SOFC application
Résumé
This paper reports the results of the thermal stability study of M-YSZ (M= Ni, Cu, Co, Cu-Co, Ni-Cu-Co) SOFC anode cermets materials at different heat treatment temperatures. The cermets were elaborated by atmospheric plasma spraying (APS) with optimised conditions and then submitted to heat treatments at 800°C and 1000°C, respectively. Scanning electron microscopy and X-ray diffraction were used to characterise, respectively, the morphology and structure of obtained films, before and after thermal annealing. A correlation was made between the differential scanning calorimetry analysis results and those obtained by X-ray diffraction. Focusing, in this study, on YSZ matrix thermal stability, the obtained results were as following: the monometallic cermets with the lowest amount of metal and the trimetallic one, exhibited a good stability at 800°C whereas at 1000°C, all considered cermets, were unstable with an eutectoid decomposition of YSZ matrix.
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