铜基体上超音速火焰喷涂镍基涂层残余应力分析

Residual Stress Analysis of Ni-based Coating Sprayed by HVAF on Copper Substrate

采用X射线应力分析技术和曲率法测试了在铜基体上喷制不同成分、厚度的镍基涂层以及改变基体厚度喷制的涂层的残余应力。结果表明,超音速火焰喷涂的镍基涂层残余应力均为压应力,涂层成分、厚度的变化对残余应力均有明显的影响,添加一定量的WC、控制涂层和基体厚度,可获得较大的残余压应力。

The residual stresses of the coatings with different composition and thickness Ni-based coatings sprayed by HVAF on the copper substrate were measured by X-ray diffraction （XRD） and curvature methods. The results indicate that the residual stress of Ni-bascd coating which was sprayed by high velocity air-fuel （HVAF） is compressive stress. The effects of coating composition and thickness on residual stress are obvious. The max residual stress value is obtained by adding proper quantity of WC powder and controlling the thickness of coating and substrate.