为了提高钢铁材料的耐磨性和硬度,利用高速电弧喷涂技术在45钢基体上制备了FeAlNbB非晶纳米晶涂层.采用扫描电镜（SEM）、能谱分析仪（EDAX）,透射电镜（TEM）和X射线衍射仪等设备对涂层的组织结构和相组成进行了分析,研究了非晶纳米晶的形成机制.实验结果表明：FeAlNbB非晶纳米晶涂层是非晶相、α-Fe、FeAl纳米晶和Fe3Al微晶共存的多相组织,涂层中非晶相含量约36.2%,纳米晶尺寸约14.1 nm;涂层组织均匀,结构致密,平均孔隙率约2.3%;非晶纳米晶涂层具有较高的硬度,其耐磨性是相同实验条件下制备的3Cr13涂层的2.2倍.
To improve the hardness and the wear resistance properties of the steel materials.FeAlNbB amorphous/nanocrystalline coatings were deposited on a mild steel by high velocity arc spraying processing of which the microstructure was characterized by SEM 、EDAX 、TEM and XRD.The results show that the microstructure consists of amorphous、α-Fe 、FeAl nanocrystalline and Fe3Al microcrystalline phase.The volumn fraction of amorphous phase is 36.2% and the size of the nanocrystalline is 14.1 nm.The coatings were fully dense with low porosity of 2.3%.The formation mechanism of amorphous/nanocrystalline was discussed.The microhardness and wear resistance of the 3Cr13 coating fabricated under the same experiment conditions and the amorphous/nanocrystalline coatings were also analyzed.The amorphous/nanocrystalline coating has high hardness and the wear resistance is 2.2 times better than that of 3Cr13 coatings.
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