Fe-Cr铁素体合金是中低温固体氧化物燃料电池理想的连接体材料,但其在高温下缺乏良好的抗氧化性能,影响了电池的高效安全运行。采用传统溶胶-凝胶提拉技术在预氧化处理 Fe-Cr 合金连接体表面制备NiMn2 O4保护涂层,并系统研究了涂层对合金连接体高温微观组织结构、抗氧化性能及导电性能的影响规律。研究结果表明,溶胶-凝胶提拉法能够在预氧化处理 Fe-Cr 合金连接体表面制备出均匀致密,与基体结合良好的NiMn2 O4保护涂层。经800℃空气中168 h高温氧化,涂覆NiMn2 O4涂层后合金连接体的高温氧化速率仅为涂覆前的1/3,且涂覆涂层后合金连接体较涂覆前具有较低的长时间稳定的面比电阻(10 mΩ?cm2)。
Fe-Cr ferritic stainless steels are the prospective interconnect materials used for intermediate tempera-ture solid oxide fuel cells (IT-SOFCs).However,the efficient and safe operation of SOFC stacks is still limited due to poor oxidation-resistance of Fe-Cr ferritic stainless steels at high temperatures.In present work, NiMn2 O4 coating was initially prepared as the protective coating materials for pre-oxidized Fe-Cr interconnect by traditional Sol-gel dip-coating method.The effect of coating on microstructure,oxidation-resistance and elec-trical behavior of Fe-Cr interconnect at high temperature was investigated.The results revealed that a relatively dense,uniform and well adherent NiMn2 O4 coating was successfully prepared on the surface of pre-oxidized Fe-Cr alloy interconnect using Sol-gel dip-coating method.After oxidation at 800 ℃ for 168 h,the high tempera-ture oxidation rate of NiMn2 O4-coated Fe-Cr interconnect was only 1/3 of the uncoated one.In addition,the coated interconnect showed a lower and more stable area specific resistance of 10 mΩ?cm2 as compared with that of uncoated interconnect.
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