Abstract
In this study, a (La0.8Sr0.2)0.98MnO3 protective layer was prepared on the C276, Crofer22 APU, SUS304, and SUS430 alloys by the atmospheric plasma spraying technique (APS). The oxidation behavior and electrical property of these metal alloys have been investigated isothermally at 800 °C in air for up to 300 h. Results showed that the ferritic steels transform into MnCr2O4 spinels and a Cr2O3 layer during isothermal oxidation. The C276 alloy formed NiCr2O4 and FeCr2O4 layers; these are protective and act as an effective barrier against chromium migration into the outer oxide layer, and the alloy demonstrated good oxidation resistance and a reasonable match to the coefficient of thermal expansion of the substrate and a low-oxide scale area-specific resistance. The ASR effects on the formation of oxide scale have been investigated, and the ASR of coated samples was below 0.024 Ω·cm2. It has good electrical conductivity for SOFC in long-term use.
Highlights
Solid oxide fuel cells (SOFCs) have recently attracted interest because of their high energy conversion efficiency, low pollution emission, effective waste-heat recovery, and relatively flexible fuel choice
Metallic material systems have been investigated for interconnected applications including Fe-based [1,2,3], ZMG 232, Crofer22 APU; Cr-based [4], Cr5 FeY2 O3 ; Ni-based alloys [5,6], Haynes 230, Haynes 242, Hastelloy S; Ni–Cr alloy systems; and so on
The results show that the La1−x Srx MnO3 (LSM) coating acts as an oxygen transport barrier that can significantly reduce the corrosion rate
Summary
Solid oxide fuel cells (SOFCs) have recently attracted interest because of their high energy conversion efficiency, low pollution emission, effective waste-heat recovery, and relatively flexible fuel choice. The interconnection is an important component in the SOFCs, which provides electrical connection between contiguous cells as well as separation of the oxygen (cathode side) and fuel gases (anode side). Interconnected materials must possess the following characteristics: excellent electrical conductivity, corrosion resistance in oxidizing and reducing environment, and matched coefficient of thermal expansion (CTE) with other SOFC components. CrO3 or CrO2 (OH) , which takes place in the oxidizing environment of the SOFC cathode side [7]. The chromia-forming alloys have some inherent weakness, i.e., poisoning the cathode’s electrochemical activity and drastically deteriorating SOFC performance under operating environments of SOFC due to Cr2 O3 evaporation over long-term operation
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