Nano-and Microparticles of Carbon as a Tool for Determining the Uniformity of a Diffuse Discharge Exposure

At present, a diffuse discharge plasma of air and other gases at atmospheric pressure is widely used for the surface treatment various materials. However, in many papers it stated that erosion damages occur on flat anodes (targets) as result action. The shape these depends mode. In this study, exposure uniformity was investigated by using nano- micro-sized carbon particles deposited copper anode (a layer). formed ‘point-plane’ gap with non-uniform electric field strength distribution applying voltage pulses an amplitude 18 kV. It has been established width 8–10 mm, imprint layer no traces local erosion. order to form uniformly distributed microcraters, necessary increase current density anode, example, decreasing width. When 6 mm less, spark channels occur. They damage both its central part. shown there are three characteristic zones: color-changing peripheral part layer, decarbonized annular zone located between parts containing individual microcraters.