Multilayer coatings based on cerium oxide and manganese cobaltite spinel for Crofer22APU SOC interconnects

Zanchi, E.; Ignaczak, J.; Cempura, G.; Molin, S.; Boccaccini, A.R.; Smeacetto, F.

doi:10.1016/j.matlet.2023.135418

Cited by 2 publications

(1 citation statement)

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“…Similarly, the perovskite coatings are ionic conductors, which cannot effectively hinder the diffusion of ions [24,25]. Up to now, spinel oxides, especially (Mn,Co) 3 O 4 , have been considered to be the most suitable protective coatings for FSS interconnects due to their satisfactory electrical conductivity and good oxidation resistance [26,27]. However, the Cr outward diffusion and O inward diffusion must be considered.…”

Section: Introductionmentioning

confidence: 99%

The Preparation and Properties of Ti(Nb)-Si-C Coating on the Pre-Oxidized Ferritic Stainless Steel for Solid Oxide Fuel Cell Interconnect

Li,

Chi,

Wei

et al. 2024

Materials

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Cr2O3 scale growth and volatilization are the main cause of the performance degradation of solid oxide fuel cells (SOFCs) with an Fe-based ferritic stainless steel (FSS) interconnect. In this work, an amorphous Ti(Nb)-Si-C coating is prepared on the pre-oxidized SUS430 with D.C. magnetron sputtering as the protective coating. The amorphous Ti(Nb)-Si-C coated alloy exhibits significantly enhanced oxidation resistance, and the oxidation kinetics obey the parabolic law with a low parabolic rate of 9.36 × 10−15 g2·cm−4·s−1. A dual-layer oxide scale is formed composed of an inner layer rich in Cr2O3 and an outer layer rich in rutile TiO2 and amorphous SiO2. MnCr2O4 appears at the interface between the inner and outer oxide layers. Meanwhile, the amorphous Ti(Nb)-Si-C coating also effectively blocks the outward diffusion of Cr. In addition, the coated steel presents good electrical properties with an area-specific resistance (ASR) of 13.57 mΩ·cm2 at 800 °C after oxidation at 800 °C in air for 500 h.

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