等离子喷涂Fe-W-B涂层的微观结构与性能研究

Research on Microstructure and Properties of Fe-W-B Coatings Prepared by Plasma Spraying

以水雾化Fe-W-B球状合金粉末为原料,在45#钢基体表面采用等离子喷涂技术制备Fe-W-B涂层。结合扫描电子显微镜（SEM）、X射线衍射（XRD）、能谱（EDS）、显微硬度计等对Fe-W-B涂层的微观结构、物相组成、元素分布、力学性能进行了研究。研究结果表明,Fe-W-B涂层呈层状堆叠结构,涂层较为致密均匀;涂层物相为α-Fe相,且衍射峰向小角度偏移,各元素分布均匀;涂层结合强度为23.1 MPa,断裂类型为涂层层间断裂;涂层硬度明显高于45#钢基体,分布在370-405 HV之间。

Fe-W-B coatings were prepared by plasma spraying with spherical water-atomized Fe-W-B alloy powders on 45# steel substrate. The microstructure,phase composition,element distribution and mechanical properties of Fe-W-B coatings were investigated by scanning electron microscopy（ SEM）,X-ray diffraction（ XRD）,energy disperse spectroscopy（ EDS）,micro-hardness tester,and so on. The results showed that the Fe-W-B coatings exhibited a layered stacking structure and the coatings were relatively compact and uniform. The phase of the Fe-W-B coatings was α-Fe phase but the diffraction peaks shifted to small angle. All elements homogeneously distributed. The adhesion strength of the coatings was 23. 1 MPa,and fracture type was the interlayer fracture in the coatings. The micro-hardness of Fe-W-B coatings was significantly higher than 45# steel substrate,ranging from 370 HV to 405 HV.