Abstract:Four types of Y2O3 partially stabilized ZrO2 (YSZ)-based agglomerated powder containing no bonding phase, Al2O3, yttrium aluminum garnet (YAG), and MgAl2O, labeled as B0, B1, B2, and B3, respectively, were prepared by spray granulation. And, the flow ability, apparent density and particle size distribution of those powders were investigated. Besides, the deposition efficiency (DE) and bonding mechanism of the four types of agglomerated powder prepared by atmospheric plasma spraying (APS) were analyzed. The results show that, compared with B0 powder, the flowability of B1, B2 and B3 powder is reduced by 6.94%, 5.15% and 25.2%, respectively, the apparent density is reduced by 2.85%, 2.19% and 7.67%, respectively, and the proportion of large-size agglomerated powder is increased by 15.82%, 6.65% and 29.75%, respectively. The DE of B1, B2 and B3 powder is increased by 75.80%, 181.49% and 59.21%, respectively, and the main reason for the improvement of DE is the adhesion and wrapping effect of the bonding phase. Because YAG has the lowest melting point and moderate particle size, B2 powder has the best flowability, the maximum apparent density, and the smallest proportion of large particles, which accordingly results in the strongest adhesion and wrapping effect and eventually leads to the highest DE.