A simple non-destructive method to indicate the spallation and damage degree of the double-ceramic-layer thermal barrier coating of La-2(Zr0.7Ce0.3)(2)O-7 and 8YSZ:Eu

Abstract

Double-ceramic-layer (DCL) thermal bather coatings (TBCs) of La-2(Zr0.7Ce0.3)(2)O-7 (LZ7C3) and Eu3+-doped zirconia, which was partially stabilised by 8 wt% yttria (8YSZ:Eu), were prepared by atmospheric plasma spraying. A thermal cycling test was carried out. The 8YSZ:Eu sublayer exposed during thermal cycling could produce visible luminescence under ultraviolet (UV) illumination, providing an indication of the spoliation and damage degree of the coating. The result shows that the application of a Eu3+-doped luminescence sublayer can be a very simple and useful non-destructive technique to indicate the spallation and damage degree of DCL coatings. Crown Copyright (c) 2013 Published by Elsevier Ltd. All rights reserved