喷涂功率和距离对铁基非晶涂层结构和耐磨防腐蚀性能的影响

Effects of Spraying Power and Distance on the Microstructure,Wear Resistance and Corrosion Resistance of Fe-Based Amorphous Coatings

为了研究等离子喷涂功率和喷涂距离对铁基非晶涂层微观结构、力学性能、耐磨性能和耐腐蚀性能的影响,以铁基非晶粉为喷涂喂料,采用等离子喷涂技术制备铁基非晶涂层,采用X射线衍射仪(XRD)和场发射扫描电镜(FESEM)对涂层的微观结构进行了表征;利用维氏硬度计和拉伸试验测定了涂层的硬度和结合强度;采用摩擦磨损试验机和电化学工作站考察了涂层的耐磨和耐腐蚀性能。结果表明:所制备的涂层均为非晶涂层,其非晶含量大于92%,在喷涂功率为22.5~33.0 kW、喷涂距离为90~150 mm范围内,较大的喷涂功率和距离均可提高涂层的非晶含量。涂层具有典型的等离子喷涂涂层形貌,涂层与基体之间结合良好,涂层的孔隙率均在5%以下,较大的喷涂功率和距离亦有利于提高涂层的致密度。喷涂功率和喷涂距离对涂层的显微硬度、耐磨性能和耐腐蚀性能有一定的影响,较大的喷涂功率和喷涂距离可提高涂层的耐磨耐腐蚀性能。

In this work,Fe-based amorphous coatings were prepared by plasma spraying technology using Fe-based amorphous powder as feedstock. The effects of spraying power and spraying distance on the microstructure,mechanical properties,wear resistance and corrosion resistance of the coatings were investigated. The microstructure of the coatings was characterized by X-ray diffractometer (XRD) and field emission scanning electron microscopy (FESEM). The hardness and bonding strength of the coatings were measured by a Vickers hardness tester and a tensile test. The wear and corrosion resistance of the coatings were investigated by a friction and wear tester and an electrochemical workstation. Results showed that the as-prepared coatings were all amorphous coatings and the amorphous content was more than 92%. When the spraying power was 22.5-33.0 kW and spraying distance was within the range of 90-150 mm,a higher spraying power and longer distance could increase the amorphous content of the coatings. The coating had a typical plasma spray coating morphology. The bond status between the coating and the substrate performed well,and the porosity of the coating was less than 5%. A higher spraying power and longer distance were beneficial for increasing the density of the coatings. The spraying power and spraying distance had an important influence on the microhardness,wear resistance and corrosion resistance of the coatings. A higher spraying power and longer spraying distance enhanced the wear and corrosion resistance of the coatings.