工艺参数对HVOF热喷涂WC-10%Co4%Cr涂层性能的影响

Effect of Process Parameters on Properties of WC-10%Co4%Cr Coating by HVOF Thermal Spraying

利用超音速火焰喷涂(High Velocity Oxygen Fuel,HVOF)技术,在30CrMnSiA表面喷涂WC-10%Co%4Cr涂层。基于正交试验设计的方法,进行3因素3水平的正交试验,系统研究了氧气流量、煤油流量和喷涂距离三个主要工艺参数对超音速火焰喷涂WC-10%Co4%Cr涂层孔隙率、显微硬度、结合强度、上粉率和残余应力的影响。通过正交试验的R值分析结果表明:煤油流量是影响涂层孔隙率的主要因素,涂层孔隙率与煤油流量呈负相关;煤油流量也是影响涂层显微硬度的主要因素,涂层显微硬度和煤油流量呈正相关;喷涂距离是影响涂层结合强度的主要因素,结合强度与喷涂距离为负相关;影响上粉率的主要因素是煤油流量,上粉率与煤油流量呈负相关;影响涂层残余应力的主要因素是喷涂距离,残余应力和喷涂距离呈负相关。研究喷涂参数对涂层性能的影响有利于后续获得理想性能的涂层。

The surface of 30CrMnSiA was coated with WC-10%Co4%Cr coating by high velocity oxygen fuel(HVOF)spraying technology.Based on the methods of orthogonal experimental design,three factors and three levels of orthogonal experiments were carried out to systematically study the effects of three main process parameters,namely kerosene flow rate,oxygen flow rate,and spraying distance,on the porosity,microhardness,bonding strength,powder rate,and residue stress of WC-10%Co4%Cr coating by HVOF spraying.The R value analysis results of the orthogonal test show that the kerosene flow rate is the main factor affecting the coating porosity,and the coating porosity is negatively correlated with the kerosene flow rate.The kerosene flow rate is also the main factor affecting the microhardness of the coating,and the coating microhardness is positively correlated with the kerosene flow rate.The spraying distance is the main factor affecting the bonding strength of the coating,and the bonding strength is negatively correlated with the spraying distance.The main factor affecting the powder rate is the kerosene flow rate,and the powder rate is negatively correlated with the kerosene flow rate.The main factor affecting the residual stress of the coating is the spraying distance,and the residue stress is negatively correlated with the spraying distance.The research on the influence of spraying parameters on coating properties is conducive to obtaining the coating with desired properties in the future.