Structural Design and Study on High Temperature Performance of 8YSZ Thermal Barrier Coating
Double-layer structured thermal barrier coatings containing NiCoCrAlY bonding layers and 8YSZ ceramic layers with different thickness were prepared on the surface of titanium alloys by atmospheric plasma spraying technique.Then,the effects of coating thickness on the physical phase,microscopic morphology,high temperature oxidation of coating,thermal insulation performance and high temperature thermal scouring mechanical properties were investigated by XRD,SEM and high temperature performance experiments.The results show that the thermal barrier coatings of different thicknesses exhibit a typical laminar structure.And there are three complex states on the surface of the coatings,such as completely molten,semi-molten and unmelted states.The thermal barrier coatings with different thicknesses all have good high temperature oxidation resistance,thermal insulation and high temperature mechanical properties.The thicker the ceramic layer,the better the high temperature oxidation resistance and thermal insulation of the coating,but the tensile strength of the titanium alloy substrate decreases.However,the thicker the ceramic layer,the more effective the mechanical properties of the titanium alloy can be under high temperature conditions.
万方数据
维普
