Emission Spectroscope Diagnostics of Direct Current Plasma Jets Used for YSZ Equiaxed Structure Coatings

摘要

This study combines spectroscope diagnostics of the plasma jet under APS and the characterization of sprayed coatings by using nanoparticles yttria partially stabilized zirconia (YSZ) powder. The absolute intensities of Ar I neutral species spectrum lines were used to estimate the electron excited temperature of the thermal plasma jets by the Boltzmann method. The effects of the detection distances, current intensities and ffe flow rates on electron temperature were analyzed. The plasma sprayed YSZ coatings were heated to 1200°C for 6 min under the atmosphere, and then the micro-structure of the nanostructured powder and coatings were analyzed by using Field Emission Scanning Electron Microscope. The results showed that the increase of input power and H_2 content considerably increased the electron temperature, while the electron temperature decreased a lot with the increase of the detection distance. The coatings were consisted of the equiaxed grains and a small-size grain shape pores.