Effect of Spraying Power on the Tribological Properties of Alumina and Alumina-Graphite Coatings

Atmospheric plasma spraying is used to deposit alumina and alumina-graphite composite coatings. The influence of arc current (plasma temperature) on the microstructure, roughness, elemental composition, phase composition coatings analyzed by scanning electron microscopy (SEM), surface roughness testing, energy dispersive X-ray spectroscopy (EDX), diffraction (XRD). tribological properties sprayed are using a tribometer with ball-on-flat configuration. as-sprayed increases size granules decreases increase in temperature. results demonstrate that friction coefficients wear rates slightly reduced for Al2O3 at higher currents. Al2O3-graphite register lower coefficient values than under dry sliding conditions.