Deposition and characterization of thermal barrier coatings of ZrO2-4 mol.% Y2O3-1 mol.% Gd2O3-1 mol.% Yb2O3

作者：Bobzin Kirsten; Zhao Lidong^*; Oete Mehmet; Linke Thomas Frederik

来源：Surface and Coatings Technology, 2015, 268: 205-208.

DOI：10.1016/j.surfcoat.2014.05.051

• Thermal barrier coating
• Multicomponent oxide-doped zirconia
• High energy ball milling
• Thermal shock behavior
• Microstructure

Multicomponent oxide-doped zirconia based thermal barrier coatings (TBCs) have been found to possess significantly lower thermal conductivity and better sintering resistance at high temperatures than current state of the art ZrO2-(7-8) wt.% Y2O3 TBCs. In this study, two TBC systems of multicomponent oxide-doped zirconia (ZrO2-4 mol.% Y2O3-1 mol.% Gd2O3-1 mol.% Yb2O3) were produced with a three-cathode plasma generator Triplex Pro-210. The first TBC system was deposited using a conventional fused and crushed spray powder. This powder was further processed by high energy ball milling to get a highly porous second TBC system. The two TBC systems were characterized in terms of their microstructures, phase compositions, mechanical properties and thermo-physical properties. Their thermal shock behavior was evaluated using thermal cyclic tests at 1150 degrees C. The results showed that the second TBC system had a significantly lower thermal diffusivity and better thermal shock behavior compared to the first TBC system due to its highly porous microstructure.

• 出版日期2015-4-25