现代电气设备的运行条件对开关设备接触部件的可靠性和寿命提出了更高要求。修复磨损接触表面最有前景的方向之一是采用气体等离子喷涂技术，该技术能够形成具有可预测使用性能的功能涂层 [1]。已确定决定修复后接触件耐久性的关键参数是喷涂层厚度及其形成的均匀性。为保证涂层结构均匀，需要等离子喷枪以恒定速度稳定移动并保证喷涂轨迹部分重叠。采用垂直于后续道次方向的多层涂覆可显著降低表面波纹度并提高涂层质量。研究表明，单个喷涂焊道的几何形状可用高斯定律描述，涂层厚度由粉末材料消耗量、等离子喷枪移动速度和等离子射流散射参数决定。散射半径取决于等离子喷枪设计、电功率、等离子体形成气体的组成和喷涂距离 [2]。所得结果表明，喷涂步距 s 与散射半径 r0 之比显著影响表面波纹度。已确定，在最终机械加工后，电磁启动器 PML-1200.04B 接触部件的功能层厚度应根据接触部件的几何参数保持在 0.6–1.2 mm 范围内。为保证稳定的运行特性，建议考虑工艺余量形成厚度达 2.4 mm 的涂层。采用液相烧结的气体等离子喷涂技术可提高接触表面的耐磨性、耐热性和导电性，这对于电气设备的现代化改造和修复尤为相关
Modern operating conditions of electrical equipment impose increased requirements on the reliability and resource of contact parts of switching devices. One of the most promising areas of restoration of worn contact surfaces is the use of gas-plasma spraying technologies, which allow the formation of functional coatings with predicted operational properties [1]. It has been established that the key parameter that determines the durability of restored contacts is the thickness of the sprayed layer and the uniformity of its formation. To ensure a homogeneous structure of the coating, stable movement of the plasma torch at a constant speed and partial overlap of the sprayed tracks are necessary. Multilayer application with perpendicular orientation of subsequent passes allows to significantly reduce the waviness of the surface and improve the quality of the coating. It is shown that the geometry of a separate sprayed roll is described by Gauss's law, and the thickness of the coating is determined by the consumption of powder material, the speed of movement of the plasma torch and the scattering parameters of the plasma jet. The scattering radius depends on the design of the plasma torch, electric power, composition of the plasma-forming gas and the spraying distance [2]. The results obtained show that the ratio between the spraying step s and the scattering radius r0 significantly affects the waviness of the surface. It was established that after the final mechanical treatment, the thickness of the functional layer of the contact part, the electromagnetic starter PML-1200.04B, should remain within 0.6–1.2 mm, depending on the geometric parameters of the contact part. To ensure stable operational characteristics, it is recommended to form a coating with a thickness of up to 2.4 mm, taking into account technological allowances. The use of gas-plasma spraying technology with liquid-phase sintering provides increased wear resistance, heat resistance and electrical conductivity of contact surfaces, which is especially relevant for the modernization and restoration of electromagnetic starters, switching equipment and power equipment in modern industry [3]. A promising direction for further research is the implementation of digital monitoring of plasma spraying parameters, the use of machine vision systems for real-time coating thickness control and the application of adaptive algorithms for controlling the process of forming functional layers.