High temperature sensing of thermal barrier materials by luminescence.

摘要

The basis for a number of concepts for in situ monitoring of thermal barrier coating heath and temperature using non-contact luminescence techniques is described. Restrictions imposed by phase compatibility and the optical properties of the coating materials are discussed as guidelines for the selection of rare-earth ions as chromophore dopants in these sensors. Extensive studies of type and concentration of rare-earth doping lead to the selection of Eu-doped materials as the preferred material for temperature sensing. Sensor layers, consisting of 1 atomic percent europia-doped yttria stabilized zirconia were deposited and exposed to high heat flux conditions similar to those seen today's turbine environments and were shown to be capable of measuring temperature at different depths within the coating.