微束等离子喷涂工艺条件对Cu涂层组织和性能的影响

采用微束等离子喷涂系统在2.8-4.2kW的小功率条件下制备了Cu涂层，研究了电弧功率，工作气体流量和喷涂距离对粒子速度与涂层显微组织结构和硬度的影响。试验结果表明，电弧功率与喷涂距离对粒子速度的影响不明显，但工作气体流量对粒子速度的影响较大，电弧功率与喷涂距离对涂层的硬度影响较大，而工作气体流量对涂层的硬度影响较小。分析表明，粒子的温度对涂层硬度有较大的影响，采用微束等离子喷涂制备的Cu涂层硬度与用传统等离子喷涂设备在30kW下制备的涂层硬度相当。

Effect of Spray Conditions on the Microstructure and Properties of Micro-Plasma Sprayed Cu Coating

Cu coating is deposited by microplasma spraying system under a low power of 2.8 to 4.2 kW. The effects of the main processing parameters including plasma arc power, operating gas flow and spray distance on the particle velocity during the spraying, and the microstructure and hardness of the coating are investigated. The experimental results show that the particle velocity is nearly independent of plasma arc power and spray distance, but is influenced significantly by operating gas flow. Moreover, the microhardness of the coating was influenced significantly by plasma arc power and spray distance, and is influenced weakly by operating gas flow. The analysis suggests that the microhardness of the coating is strongly affected by particle temperature. The comparison shows that the microhardness of the Cu coating deposited by microplasma spray is comparable to that of the coating deposited by conventional plasma spray system at power level of 30 kW.