Effect of laser irradiation on structure and properties of composite coatings

Abstract

It is shown that the laser radiation is much «mixes» coating Cr–Mn–Si–Cu–Fe–Al with the near-surface layers of the basics, like changing the structure of the coating and its elemental composition at different points of the sample. From the XPS analysis that the content of coating element deviates from the average content of the coating prior to laser irradiation, but they occur at specific points in the coagulation of the sample. Occurrence coagulates can be associated with diffusion processes coating transfer elements (diffusion rate is usually small in this case), and hydrodynamic processes under the influence of laser shock waves in the liquid phase of the coating. To coating the Cr–Mn–Si–Cu–Fe–Al+Ti in an argon environment friction coefficient decreases after laser processing, and micro-hardness increases. The first effect is associated with a decrease in roughness of the coating when the laser beam reflow. The second effect is due to the formation of the dislocation structure of the coating with a sharp heating-cooling. When coating Cr–Mn–Si–Cu–Fe–Al+Ti in a nitrogen environment are formed in the last field containing chromium and titanium nitrides, and XPS data on the contents of the two components is approximately the same.