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

Autor: Kirsten Bobzin, Thomas Frederik Linke, Mehmet Öte, Lidong Zhao
Rok vydání: 2015
Předmět:
Zdroj: Surface and Coatings Technology. 268:205-208
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2014.05.051
Popis: 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 ZrO 2 –(7–8) wt.% Y 2 O 3 TBCs. In this study, two TBC systems of multicomponent oxide-doped zirconia (ZrO 2 –4 mol.% Y 2 O 3 –1 mol.% Gd 2 O 3 –1 mol.% Yb 2 O 3 ) 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 °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.
Databáze: OpenAIRE
Externí odkaz: