Effect of ZrO2 particle on the performance of micro-arc oxidation coatings on Ti6Al4V

This paper investigates the effect of ZrO2 particle on the oxidation resistance and wear properties of coatings on a Ti6Al4V alloy generated using the micro-arc oxidation (MAO) technique. Different concentrations micron ZrO2 particles were added in phosphate electrolyte and dispersed by magnetic stirring apparatus. The composition of coating was characterized using X-ray diffraction and energy dispersive spectrum, and the morphology was examined using SEM. The high temperature oxidation resistance of the coating sample at 700 °C was investigated. Sliding wear behaviour was tested by a wear tester. The results showed that the coating consisted of ZrTiO4, ZrO2, TiO2. With ZrO2 particle addition, the ceramic coating's forming time reduced by the current dynamic curve. It was shown that the addition of ZrO2 particles (3 g/L, 6 g/L) expressed an excellent oxidation resistance at 700 °C and wear resistance.