Influence of Plasma Spray Parameters on the Microstruc-ture and Property of ZrO2-7 wtY203 Coating

摘要

The plasma sprayed ZrO2-7 wt%Y2O3 (7YSZ) coating has been widely applied in aircraft engine as a thermal barrier coating. In this study, the duplex TBC system (MCrAlY + 7YSZ) were deposited onto 304 stainless steel substrate by APS. Four principal spraying parameters during the deposition of 7YSZ coating were optimized by using orthogonal experimental design, including the stand-off distance, plasma power, preheating temperature and powder feeding rate. Their influences on the coating's microstructure, adhesion and its mechanical properties were studied and the optimized parameters were finally obtained. The results showed that the dependence of the spraying parameters on the properties of 7YSZ coating is highly correlated to the melting condition of the inflight particles.