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利用超音速火焰喷涂(HVOF)方法在304钢上制备了厚度约为30μm的Fe40Al-50%Cr3C2涂层,采用XRD,SEM/EDS分析其在阶梯温度退火后的微观结构演化行为。退火前涂层的表面十分粗糙,成分分布很不均匀,主要由Fe、Al和Fe-Al金属间化合物以及少量的Fe、Al的氧化物组成,涂层的最外层存在较多大块Fe颗粒,靠近基体部分存在少量的Al颗粒。经过真空退火处理之后,涂层的成分均匀性有了很大的改善,但是涂层中的一些孔洞依然存在。随着真空退火温度从700℃升高到900℃,涂层中大块Fe、Al颗粒逐渐消失,Fe、Al扩散反应更加充分,涂层中形成了更多的Fe-Al金属间化合物。
The Fe40Al-50% Cr3C2 coating with a thickness of about 30μm was prepared on 304 steel by the supersonic flame spraying (HVOF) method. The microstructure evolution of the coating was analyzed by XRD and SEM / EDS. The surface of the coating before the annealing is very rough, the composition distribution is not uniform, mainly by the Fe, Al and Fe-Al intermetallic compounds and a small amount of Fe, Al oxide composition, the outermost layer of the coating there are more large Fe particles , There is a small amount of Al particles near the base portion. After the vacuum annealing treatment, the composition of the coating has been greatly improved uniformity, but some of the holes in the coating still exist. With the increase of vacuum annealing temperature from 700 ℃ to 900 ℃, the bulk Fe and Al particles in the coating gradually disappear, and the Fe and Al diffusion reactions are more sufficient, and more Fe-Al intermetallic compounds are formed in the coating.