热喷涂和激光熔覆集成设备在高性能表面处理领域的应用

Flexible Installations Combining Thermal Spray and Laser Based Processes for High Efficiency Protection of Component Surfaces

本论文阐述的是将各种不同的热喷涂技术与激光表面加工技术进行组合后通过同一个控制系统进行控制的新型集成设备。这种集成设备的优势在于某些工业领域应用部件表面不同部位需要通过两种不同的工艺技术进行处理时,比如沉没辊和发动机叶片。另外,采用激光设备对热喷涂涂层进行后处理并获得更加优异的涂层性能的应用领域也在不断的扩大,比如将热喷涂的镍基和钛合金涂层通过新型的激光设备进行再次加工,将会得到性能更加优异的涂层结构。目前最先进的理念是,将热喷涂与激光设备充分地融合在一起,通过更加高效节能的方法获得性能更加可靠的涂层质量,如对于粉末状的材料来说,用热喷涂的电弧或火焰对喷涂材料进行预热后再准确地注入激光的熔池内;而针对丝材,则可采用电阻加热的方式对丝材进行预热后再注入激光熔池内。

The paper describes novel installations that are capable to control different thermal spray processes as well as laser based surface treatment processes and their advantages for the user concerning efficiency in industrial production. Particular benefits for components that require use of both process types on different surface areas are explained at the example of turbine blades and steel mill zinc pot rolls. The capability to achieve outstanding surface properties by laser post treatment of thermal spray coatings taking advantage of adapted metallurgical concepts is introduced at the example of nickel alloy and titanium coatings on steel substrates. Finally hybrid processes that feature feedstock pre-heating by processes with high energetic efficiency （autogenous flame for powders, resistance heating for wires） before injection into the melt formed by lasers during cladding and the resultant benefits for the overall process efficiency are introduced.