层流等离子体材料表面改性工艺研究

针对热物理性能明显不同的3种金属,研究层流等离子体技术在材料表面改性工程应用的可行性.结果表明,重熔工艺适用于热导率适中和微结构稀疏的铸铁类材料;熔覆工艺则适用于低热导率的不锈钢.两种处理工艺均可以明显改变热影响区的材料微结构并提高材料表面硬度.研究表明改性层微结构的改善与材料热物理性能和凝固过程瞬态特性密切相关.

Material Surface Modification Processing with Laminar Plasma Technology

The possibilities of laminar plasma technology applied in surface modification were investigated on three typical metals with quite different thermo-physical properties. The tests demonstrate that this remehing process can evidently improve the microstructure and properties of the cast materials with moderate heat conductivity and loose microstructure such as cast iron. The cladding tests were carried out on stainless steel with low heat conductivity. The results show that all the remelting and cladding processes with laminar plasma technology can improve the microstructures and increase the hardness of the surface modified layers. These treatment effects are closely related to the thermo-physical properties of materials and the transient characteristics in rapid solidification.