孔隙率对风电滑动轴承激光熔覆涂层摩擦磨损性能的影响

Effect of Porosity on Friction and Wear Properties of Laser Cladding Coatings on Sliding Bearings for Wind Turbines

通过微观组织平均视场法测定了风电齿轮箱行星轮滑动轴承CuSn12Ni2激光熔覆涂层的孔隙率,开展了干摩擦和油润滑条件下不同孔隙率涂层的摩擦磨损试验,运用Archard磨损公式并基于UMESHMOTION子程序在ABAQUS有限元软件中模拟了不同孔隙率涂层的摩擦磨损过程。研究结果表明:在干摩擦和油润滑条件下涂层的磨损形式为黏着磨损和磨粒磨损,孔隙率越高涂层磨粒磨损越明显;10,20 N载荷下涂层磨痕位置硬度增幅、磨损深度、磨损宽度、磨损率与孔隙率呈正相关,涂层表面硬度、摩擦系数标准差、摩擦系数平均值与孔隙率呈反相关,孔隙缺陷降低了涂层的摩擦磨损性能;30 N载荷下不同孔隙率涂层摩擦系数标准差、摩擦系数平均值较为接近;载荷越大,孔隙率对涂层摩擦磨损性能的影响越小。

The porosity of CuSn12Ni2 laser cladding coatings on sliding bearings for planetary gears in wind turbine gearboxes is determined by average field of view method of microstructure.The friction and wear experiments of the coatings with different porosities are carried out under dry friction and oil lubrication conditions.The friction and wear process of the coatings with different porosities is simulated in ABAQUS by using Archard wear formula and UMESHMOTION subroutine.The research results show that the wear forms of the coatings are adhesive wear and abrasive wear under dry friction and oil lubrication conditions,the higher the porosity,the more obvious the abrasive wear of the coatings;under the load of 10 N and 20 N,the hardness increase,wear depth,wear width and wear rate of wear scar position of the coatings are positively correlated with porosity,while the surface hardness,standard deviation of friction coefficient and average value of friction coefficient of the coatings are inversely correlated with porosity,the pore defects reduce the friction and wear properties of the coatings;under the load of 30 N,the standard deviation of friction coefficient and average value of friction coefficient of the coatings with different porosities are close;the larger the load,the smaller the effect of porosity on friction and wear properties of the coatings.