在中温平板型固体氧化物燃料电池(ITSOFC)设计中,可以采用金属作为连接材料.Fe-16Cr合金是较为理想的金属连接材料,它存在的主要问题是连接体阴极侧表面的高温氧化和腐蚀,会导致电池性能的迅速降低.本研究采用空气等离子喷涂的方法喷涂了La0.8Sr0.2MnO3-σ(LSM)钙钛矿型保护涂层在金属连接板的表面,并讨论了主要过程参数及其作用效果.研究发现,喷涂后热处理是降低涂层孔隙率的有效方法,经喷涂-热处理后,涂层的孔隙率可降至1%以下.等离子喷涂LSM保护涂层后,Fe-16Cr合金的耐高温氧化性能明显提高,氧化速率降低了76%.
In the planar design of intermediate temperature solid oxide fuel cell (ITSOFC), a metallic interconnect is used to separate the single cells. Fe-16Cr alloy is a promising metallic interconnect material and a disadvantage of it is the high-temperature oxidation and corrosion at the surface of the cathode side leading to rapid cell degradation. In this paper, a dense La0.8Sr0.2MnO3-σ (LSM) perovskite coatings were deposited on the surfaces of the metallic interconnects prepared by atmospheric plasma spraying (APS). The main process factors and their effect on protective coatings were discussed. The appropriate process parameters were determined in the experiment. It was found that heat treatment after APS is an effective method for reducing the porosity in the coating. After heat-treatment, the LSM coatings with porosity with less than 1% were obtained. By spraying LSM protective coatings, the oxidation rate of Fe-16Cr alloy in air at 1073 K was lowered by 76%.
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