采用溶胶-凝胶法制得MnCo2O4纳米粉体,通过XRD和TEM分析了粉体的物相和形貌;通过添加适量乙基纤维素和松油醇经研磨制成浆料,并采用丝网印刷法涂覆于SUS430基片上,在900℃下95％N2+5％H2气氛中保温3h,再于800℃空气气氛中保温10h烧结得到涂层.采用SEM对涂层的表面和断面进行了观察,在750℃空气气氛下测试了SUS430/MnCo2O4样品的导电性能和抗氧化性能,最后采用EDS对涂层的断面进行分析.结果表明:MnCo2O4粉体为单一的立方尖晶石相,晶粒大小均匀,粒径约150 nm;MnCo2O4涂层致密,与基体紧密结合且厚度均匀.SUS430/MnCo2O4样品在750℃空气气氛下经1000 h氧化后,氧化增重量仅为0.15 mg/cm2,是SUS430合金氧化增重量的1/6;面比电阻值为0.026Q·cm2,比SUS430合金的面比电阻值低了两个数量级;EDS结果表明:Cr元素主要分布在涂层与合金的界面,在涂层内部无分布.研究显示,MnCo2O4涂层能显著降低SUS430合金基体的氧化速率,有效改善其在高温下的导电性能,并成功抑制Cr元素的挥发.
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