Columnar structured YSZ coating formation by PS-PVD using conventional plasma spray system assisted through droplet filtering

It was only performed light of sight deposition in atmospheric plasma spray (APS) and electron beam physical vapor deposition (EB-PVD). The PS-PVD processing was realized no light of sight deposition which bridge the gap between APS and EB-PVD. In this study, shielding deposition process was used to fabricate YSZ coatings and the microstructure and deposition behavior were also researched. A shrouded plasma torch was used to proceed on PS-PVD working. Multiple samples were placed on the same straight line to realize multi-stage shielding. The surface morphology and cross section morphology of coatings were observed by SEM. It was found that the surface was shown an island structure and the nano particles consist of island were grown smaller with the increased shielding stage. The cross section morphology of fracture coatings was shown columnar structure. This confirmed that the YSZ coatings were deposited via vapor phase at the condition of shielding.