In this paper, the high chromium Fe-based composite coatings with different mass fractions of MoS₂ powders were prepared by supersonic plasma spraying technology. The influence of MoS₂ addition on the microstructure, phase composition, hardness, coating-substrate bonding strength, and friction & wear properties was studied. The results show that the interface between the deposited coatings and the substrates exhibited no obvious detachment, and the porosity was reduced with the addition of MoS₂. However, the hardness of composite coatings and bonding strength between coatings and substrates were decreased with the increase of MoS₂ content. Attributed to the fact the Cr element in Fe-based powder played a role of stabilizing the ferrite phase and deoxygenation, no oxide and phase transformation of α-(Fe, Cr) were detected. The XRD results also revealed that partial decomposition of MoS₂ occurred during the spraying process, leading to the formation of Mo. The worn surface morphology analysis showed that the wear mechanism of the Fe-based coating without MoS₂ was mainly oxidative wear. Through the evolution of wear mechanism of three composite coatings, it is found that with the increase of MoS₂ content, the phenomenon of abrasive & fatigue wear was intensified, owing to the reason that the bonding between Fe-based matrix material and MoS₂ in the coating was poor. Therefore, the content of MoS₂ should be rationally controlled in order to improve the friction & wear properties.

本文采用超声等离子喷涂技术制备了不同质量分数的MoS ₂粉末的高铬铁基复合涂层。研究了MoS _2的添加对组织，相组成，硬度，涂层与基底的结合强度以及摩擦磨损性能的影响。结果表明，沉积的涂层与基体之间的界面没有明显的剥离，并且孔隙率随着MoS ₂的加入而降低。然而，随着MoS ₂的增加，复合涂层的硬度和涂层与基材之间的结合强度降低。内容。由于铁基粉末中的Cr元素起到稳定铁素体相和脱氧的作用，因此未检测到α-（Fe，Cr）的氧化物和相变。XRD结果还表明，在喷涂过程中发生了MoS _2的部分分解，导致Mo的形成。磨损表面形貌分析表明，不含MoS ₂的Fe基涂层的磨损机理主要是氧化磨损。通过三种复合涂层的磨损机理的演变，发现随着MoS ₂含量的增加，由于Fe基基体材料与MoS ₂的结合，磨蚀和疲劳磨损现象加剧。在涂层中很差。因此，应合理控制MoS ₂的含量，以提高摩擦磨损性能。