Oxidation Behavior of NiFe2O4 Spinel-Coated Interconnects in Wet Air
Oxidation Behavior of NiFe2O4 Spinel-Coated Interconnects in Wet Air
复制标题
NiFe2O4 尖晶石涂层互连线在湿空气中的氧化行为
DOI：
10.1007/s11085-018-9851-8
复制
发表时间：
2018
影响因子：
2.2
通讯作者：
Chao Liu Zeng
中科院分区：
文献类型：
--
作者：
Peng Fei You;Xue Zhang;Hai Liang Zhang;Chao Liu Zeng
铁素体不锈钢是固体氧化物燃料电池连接件的理想材料。然而，含铬氧化膜中铬的挥发会导致阴极中毒，特别是在潮湿空气中，从而大大降低电池的性能。在本研究中，NiFe 2 O 4尖晶石涂层的保护性和粘附性施加到430型不锈钢（430 SS），以隔离Cr2 O3从气体环境。分别在700 ° C、800 ° C和850 °C下在空气-7%H2O中评估了未涂覆的和NiFe 2 O 4涂覆的样品的性能。裸钢在700 °C和800 °C下失去质量，并且在约75小时后在850 °C下经历脱离氧化，包括氧化皮剥落和Cr蒸发。NiFe 2 O 4涂层能显著提高430不锈钢的抗氧化性能，有效地阻止Cr的向外扩散，抑制Cr的挥发。
Ferritic stainless steels are promising materials for solid oxide fuel cell interconnect applications. However, volatilization of Cr from the Cr-containing oxide scales can result in cathode poisoning, especially in wet air, and thus greatly degrades the performances of the cell. In the present study, a protective and adhesive NiFe2O4spinel coating was applied on a type 430 stainless steel (430SS) to isolate Cr2O3from gas environment. The performance of the uncoated and NiFe2O4-coated samples has been evaluated in the air-7%H2O at 700, 800, and 850 °C, respectively. The bare steel lost mass at 700 and 800 °C and underwent breakaway oxidation at 850 °C after ~ 75 h, including scale spallation and Cr evaporation. The NiFe2O4coating could significantly increase the oxidation resistance of 430SS and effectively retard the outward diffusion of Cr and inhibit the Cr evaporation.