Study On Optimun Of Plasma Sprayed FGM

According to the application needs of functionally gradient thermal barrier coatings for low heat emission engine, the measurement and analysis on the in-flight particle temperature, velocity field in plasma sprays are carried out in this thesis, and the study on relation between in-flight particle temperature, velocity and the coatings microstructure, bonding are performed. It is found that the coatings microstructure and bonding depend strongly on the in-flight particle temperature, velocity. Thermal shock tests of plasma sprayed functionally gradient coatings are approached. The integral thermal shock test results show that the coatings thermal cycle lives increase distinctly, and the coatings failure in integral thermal shock test was caused by the thermal circle tension-stress. Through analysis of the two style tests, we think that the failure mechanisms of the functionally gradient coatings are different in different thermal circumstance.