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固体氧化物燃料电池用SUS430-Sr2Fe1.5Mo0.5O6‒δ不锈钢-陶瓷复合连接体材料的制备及性能研究

Preparation and performance of SUS430-Sr2Fe1.5Mo0.5O6‒δ stainless steel-ceramic composite interconnect materials for solid oxide fuel cell

  • 摘要: 以SUS430不锈钢粉末和Sr2Fe1.5Mo0.5O6−δ(SFM)陶瓷粉末为原料,通过成形烧结结合涂覆的方法制备了应用于固体氧化物燃料电池(solid oxide fuel cell,SOFC)的SUS430-SFM不锈钢-陶瓷复合连接体材料,并对SUS430和SUS430-SFM两种烧结体试样的显微组织、抗氧化性能和导电性能进行了分析。结果表明,SFM涂层与SUS430基体具有相匹配的热膨胀系数(thermal expansion coefficient,TEC),两者界面结合良好;在空气气氛中经800 ℃氧化140 h后,SUS430-SFM试样的氧化速率常数(K)约为3.66×10−14 g2∙cm−4∙s−1,比SUS430试样(2.42×10−14 g2∙cm−4∙s−1)降低了约50%,其面比电阻(area specific resistance,ASR)则由SUS430试样的81 mΩ∙cm2降至SUS430-SFM的2.6 mΩ∙cm2,说明SFM涂层能够有效改善SUS430不锈钢基体的抗氧化及导电性能。

     

    Abstract: The SUS430-Sr2Fe1.5Mo0.5O6−δ (SUS430-SFM) stainless steel-ceramic composite connector materials for solid oxide fuel cell (SOFC) were prepared by a compaction-sintering-coating method, using SUS430 stainless powders and Sr2Fe1.5Mo0.5O6−δ (SFM) ceramic powders as the raw materials. Microstructure, oxidation resistance, and electrical conductivity of the sintered SUS430 and SUS430-SFM samples were characterized. The results show that the SFM coating and the SUS430 substrate show a matching thermal expansion coefficient (TEC), and there is a good combination between the coating and the substrate. The oxidation rate constant of the SUS430-SFM sample is about 3.66×10−14 g2∙cm−4∙s−1 after oxidation at 800 ℃ for 140 h in air, which is about 50% lower than that of the SUS430 sample (2.42×10−14 g2∙cm−4∙s−1). The area specific resistance (ASR) of the SUS430-SFM sample also reduces from 81 mΩ∙cm2 (SUS430 sample) to 2.6 mΩ∙cm2. The present work indicates that the SFM coating can effectively improve the oxidation resistance and the electrical conductivity of the SUS430 stainless substrate.

     

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