Modification of the La0.6Sr0.4CoO3 coating deposited on ferritic stainless steel by spray pyrolysis after oxidation in air at high temperature

Effect of High-Temperature Exposure on Degradation of La0.6Sr0.4CoO3 Coated Metallic Interconnects for ITSOFC and SOEC

“…Liu and Konysheva 49 indicated through impedance analysis, that SrCrO 4 precipitation occurs by growing a layer between the Sr rich and Cr rich interfaces. In previous work 29 , a computational simulation was performed, that showed the stability of the SrCrO 4 oxide when a system containing Sr and variable amounts of Cr was exposed to an environment rich in O 2 at 800°C, causing perovskite degradation from the La 0.6 Sr 0.4 CoO 3 phase to the La 0.9 Sr 0.1 CoO 3 phase, in agreement with the observed degradation of the perovskite in the XRD results. Furthermore, Yokokawa et al 43 showed that SrCrO 4 formation is thermodynamically favored for perovskites containing less stable tetravalent ions (Fe 4+ or Co 4+ ).…”

“…The metallic substrate was placed under the spray nozzle to obtain a more homogeneous film deposition. The deposition parameters were shown in our previous paper 29 .…”

“…The main types of coatings include rare earth oxides [18][19][20] , perovskites 21 and spinels [22][23][24][25][26] . Among these materials, the perovskite oxides, such as the ones based on lanthanum chromite (LCr; LaCrO 3 ) 27 , strontium-doped lanthanum manganite (LSM; La 1-x Sr x MnO 3 ) 28 , strontium-doped lanthanum cobaltite (LSC; La 1-x Sr x CoO 3 ) 29 , and strontium-doped lanthanum ferrite (LSF; La 1-x Sr x FeO 3 ) 17 , are currently of great interest due to the possibility combining different elements to obtain an electrical conductivity compatible with the specifications of the ITSOFC 5 . The main methods used for coating applications are: dip coating 30 , chemical vapor deposition 31 , pulsed laser deposition 32 , plasma spraying 33,34 , screen printing, slurry coating 35 , sputtering 36,37 , electrodeposition 38 , and spray pyrolysis 29,39,40 .…”

“…As a continuation of our previous investigation 29 , the purpose of this study was to investigate the effect of oxidation on AISI 430 ferritic stainless steel coated with La 0.6 Sr 0.4 CoO 3 (LSC), obtained by spray pyrolysis. The electrical conductivity at high temperatures was evaluated in an inert atmosphere using electrochemical impedance spectroscopy (EIS).…”

Metallic/Ceramic (Fe-22Cr mesh/ LaNi0.6Fe0.4O3-δ) Composite as Contact Material for SOFCs

“…Therefore, these results demonstrate the viability of a configuration consisting of the combination of a dense electronic conducting ceramic material with Fe-22Cr mesh, which gives the contact layer the required good mechanical properties to provide the continuity of the coating on the channeled interconnect. However, the TEC of LNC is significantly higher than that of Fe-22Cr alloy [10,12]. Such a TEC mismatch will probably result in detachment of the contact coating under long-term SOFC operation conditions.…”