Influence of plasma spray parameters on formation and morphology of ZrO2-8wt% Y2O3 deposits

Spray prints of thermal spray coatings were created on glass slides for air -plasma-sprayed 8-wt % -yttria-partially-stabilized zirconia (YSZ) deposits . The spray parameters such as carrier gas flow rate, standoff distance, an d torch power were systematically changed to investigate the influence of t hese parameters on the YSZ deposit characteristics. The deposit properties such as deposition efficiency (DE), substrate coverage, deposit thickness, and roughness were measured. The deposits sprayed with a 3.5-4.0 L/min carr ier gas flow rate at an 80 mm standoff distance exhibited higher values of DE within the range of studied process parameters. The DE increased as much as 25% by varying the carrier gas flow rate from 2.0 to 4.0 L/min, The dep osits sprayed at a higher standoff distance and low torch power gave poor d eposit characteristics. The deposit characteristics were compared with the in-night particle parameters and revealed that the deposit characteristics strongly depended on the in-flight particle temperature. Using the in-fligh t particle properties, the flattening ratio and the splat thickness were ca lculated. The average size of particles adhering to the substrate was found to drastically change with a change of process conditions, being much less than the average size of the starting powder.