Fabrication of YSZ/Al composite coating on Incoloy 825 superalloy using electrophoretic deposition

Abstract In this research, Fabrication of YSZ/Al composite coating on Incoloy 825 superalloy using electrophoretic deposition has been investigated. Dispersion of YSZ and Al particles suspension in acetone in presence of iodine, as dispersant, was studied by particle size and zeta potential measurement. According to the results, the suspension containing 1.2 g/l iodine has been chosen for electrophoretic co-deposition of YSZ and Al particles. Mean diameter of YSZ and Al particles in this suspension was measured 111.6 nm and 2.658 μm and zeta potential value of these particles was measured 50.2 and 16 mV, respectively. In order to investigate the influence of applied voltage and deposition time on quality of formed deposit, electrophoretic co-deposition has been carried out at different voltages and deposition times. Results revealed that the deposit formed at voltage of 6 V and deposition time of 3 min had uniform and crack-free surface. SEM image showed that this coating had thickness of 19.63 μm.