飞机发动机风扇叶片CuNiIn涂层等离子喷涂的工艺优化

Optimization of Plasma Spraying Technology for Fabricating CuNiln Coating on Blade of Aircraft Engine Fan

为了给国内航空发动机风扇叶片Cu Ni In涂层制备提供相关技术支持,利用等离子喷涂技术在Ti6Al4V基体材料上制备Cu Ni In涂层,观察涂层微观结构,分析涂层孔隙率、界面污染物等,研究喷涂功率、喷涂距离及基体表面粗糙度对涂层结合强度、显微硬度等的影响。结果表明:喷涂功率的增加会导致Cu Ni In涂层显微硬度增加,结合强度降低;喷涂距离增加,涂层显微硬度和结合强度都呈现先增后减的趋势;基体表面粗糙度增加,涂层结合强度增加,但粉末沉积率降低;优化工艺为喷涂功率32.3 k W,喷涂距离85 mm,采用36目白刚玉喷砂(基体表面粗糙度6.3μm);优化工艺制备的涂层结合强度达到45.83 MPa,显微硬度达到159.2 HV,孔隙率为0.578%,可为国内风扇叶片Cu Ni In涂层制备提供相关技术支持。

CuNiln coating was prepared on Ti6Al4 V substrate by air plasma spraying so as to provide technological support for its application in protecting the blade of domestic aircraft engine fan.The microstructure and morphology of as-prepared CuNiln coating were analyzed with a metallographic microscope,and its porosity as well as interfacial pollutants was analyzed as well.Moreover,the effects of spraying power,spraying distance and substrate surface roughness on the bonding strength and microhardness of asfabricated CuNiln coating were investigated,and the plasma spraying technology was optimized.Results showed that elevating spraying power led to increase of microhardness and decrease of bonding strength of the CuNiln coating.With the increase of the spraying distance,the microhardness and bonding strength of the coating tended to rise initially but decline later.With the increase of the substrate surface roughness,the bonding strength of the coating increased,but the powder sedimentation rate decreased.The optimized plasma spraying parameters were suggested as spraying power of 32.3 kW,spraying distance of 85 mm and substrate surface roughness of 6.3μm(sand- blast by 36 mesh corundum).The CuNiln coating obtained under the optimized plasma spraying parameters exhibited a bonding strength of 45.83 MPa,a microhardness of 159.2 HV and a porosity of 0.578%,showing potential for the protection of the blade of domestic aircraft engine fan.