Influence of Heat Treatment on Microstructures and Properties of Nanosized Zirconia Powder and Coating
YAO Xing-he, ZHU Yong-ping ZHANG Wei-gang
State Key Laboratory of Multi-Phase Reaction Engineering, Institute of Process Engineering, Chinese Academy of Sciences Key Lab of Multi-phase Reactions, Institute of Process Engineering. Chinese Academy of Sciences Key Lab of Multi-phase Reactions, Institute of Process Engineering. Chinese Academy of Sciences
Abstract： The effects of high-temperature sintering, plasma torch and plasma flow heat treatments on the properties of ZrO2-8%mol Y2O3 (8YSZ) spherical powder and plasma sprayed coating were investigated. The results show that the plasma sprayed coating derived from plasma torch treated powder of 8YSZ has the highest bonding strength of 25 MPa and the best thermal shock resistance of 41 thermal cycles which is under water cooling after treatment at 1200℃ for 5 min. The coating fabricated by plasma flow treated 8YSZ has very low bonding strength of 11 MPa and poor thermal shock resistance of 17 thermal cycles. The coating prepared by sintering treated 8YSZ relies on the temperature and time of treatment, and the best mechanical properties are obtained when 8YSZ powder is treated at 1200℃ for 2 h, the average is 21 MPa and 38 thermal cycles.