基于正交试验法的超音速等离子喷涂钼涂层组织及性能研究

为了探索电磁轨道炮轨道材料45Cr Ni Mo VA钢表面耐磨强化的可能,运用超音速等离子喷涂技术在45Cr Ni Mo VA钢表面制备了钼涂层,结合正交试验法对喷涂参数进行了优化,研究了喷涂参数对涂层性能的影响规律、综合性能最佳时涂层的组织和性能。结果表明:喷涂电压115 V、喷涂电流380 A、氩气流量130 L/min、喷涂距离100 mm时涂层具有最佳综合性能,其导电率为6.01%IACS,表观孔隙率低至0.12%,显微硬度及内聚强度分别高达482.3HV0.1和52.1 MPa;涂层在轻载荷低频率(5 N、5 Hz)下的磨损率略低于基体,但在重载荷高频率(20 N、20 Hz)下的磨损率仅为基体50%左右,表现出良好的耐磨性能,其磨损机理均为粘着磨损和氧化磨损。

Research on Microstructure and Properties of Supersonic Plasma Sprayed Mo Coating based on Orthogonal Experiment

In order to explore the anti-wear reinforcement of the surface of 45CrNiMoVA which acts as rail materials for electromagnetic railgun, Mo coating on 45CrNiMoVA surface was prepared by supersonic plasma spraying technology. The spray parameters are optimized by orthogonal experiment, and the effects of spray parameters on the properties of coating and the structure and properties of the optimal coating are discussed. The research results show that the coating has the best integrative property when spray voltage is 115 V, spray current is 380 A, Ar gas flow rate is 130 L/min, and spray distance is 100 mm. The conductivity, porosity, microhardness and adhesive strength of the optimal Mo coating are 6.01%IACS, 0.12%, 482.3 HV_0.1 and 52.1 MPa , respectively. The wear rate of optimal Mo coating is slightly lower than that of substrate at 5 N load and 5 Hz frequency, while its wear rate is only around half as that of substrate at 20 N load and 20 Hz frequency, and the wear mechanism is adhesive wear and oxidative wear.