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<p>Ferritic stainless steel has attracted considerable research attention for its potential application as an interconnect of solid oxide fuel cells (SOFCs). Nevertheless, its limited high-temperature oxidation resistance has constrained its widespread applications. In order to further explore the enhancement of its properties through sintering treatment, this study prepared a spinel coating on the surface of a ferritic stainless steel substrate (SUS430) via electrophoretic deposition and optimized its sintering treatment, thereby enhancing its overall high-temperature performance. Six types of sintering treatments were designed and applied to the prepared spinel-coated samples, including sintering in air and in an argon atmosphere, and also sintering in a two-step process. The elemental and phase composition of the sintered samples was characterised via SEM-EDS, XRD, and XPS. Subsequently, surface resistivity measurements were conducted to evaluate their electrical conductivity. The results indicate that samples sintered in argon gas exhibit a chromium content that is 10% to 30% lower than those sintered in air. The lowest surface resistivity of samples sintered in oxygen is 16.66&#xa0;mΩ·cm<sup>2</sup>, while that of samples sintered in argon is 8.82&#xa0;mΩ·cm<sup>2</sup>, with a reduction of 50%. And the samples sintered at 750&#xa0;°C under an argon atmosphere exhibit the best comprehensive properties. The other sintering treatments also demonstrate effective improvements in the oxidation resistance, electrical conductivity, and chromium resistance of the ferritic stainless steel. The present study provides a theoretical basis for the application of sintering treatment in SUS430 stainless steel interconnect for SOFCs.</p> Graphical Abstract <p></p>

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Sintering Treatment Optimization of MnCo2O4 Spinel Coatings on SOFC Metallic Interconnect Surface

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • Hao-Tian Yang,
  • Chen-Yang He,
  • Hao Yun,
  • Zhen-Jiang Li,
  • Wen Yang

摘要

Ferritic stainless steel has attracted considerable research attention for its potential application as an interconnect of solid oxide fuel cells (SOFCs). Nevertheless, its limited high-temperature oxidation resistance has constrained its widespread applications. In order to further explore the enhancement of its properties through sintering treatment, this study prepared a spinel coating on the surface of a ferritic stainless steel substrate (SUS430) via electrophoretic deposition and optimized its sintering treatment, thereby enhancing its overall high-temperature performance. Six types of sintering treatments were designed and applied to the prepared spinel-coated samples, including sintering in air and in an argon atmosphere, and also sintering in a two-step process. The elemental and phase composition of the sintered samples was characterised via SEM-EDS, XRD, and XPS. Subsequently, surface resistivity measurements were conducted to evaluate their electrical conductivity. The results indicate that samples sintered in argon gas exhibit a chromium content that is 10% to 30% lower than those sintered in air. The lowest surface resistivity of samples sintered in oxygen is 16.66 mΩ·cm2, while that of samples sintered in argon is 8.82 mΩ·cm2, with a reduction of 50%. And the samples sintered at 750 °C under an argon atmosphere exhibit the best comprehensive properties. The other sintering treatments also demonstrate effective improvements in the oxidation resistance, electrical conductivity, and chromium resistance of the ferritic stainless steel. The present study provides a theoretical basis for the application of sintering treatment in SUS430 stainless steel interconnect for SOFCs.

Graphical Abstract