Research status of intelligent temperature sensitive coatings based on fluorescence characteristics of rare earth ions

Abstract:

Intelligent temperature sensitive coating is a new kind of functional coating, which has the function of real-time detection of temperature changes, can achieve the timely detection and treatment of abnormal temperature in the process of coating use. The measurement error of external temperature measuring device and the inconvenience of temperature measurement are reduced. In this paper, the research status of aeroengine temperature detection is introduced in detail, and the principle of up conversion luminescence used in rare earth ion temperature detection is introduced. The advantage of temperature measurement lies in real-time detection, no external temperature measurement and other methods on the shape and size of the workpiece requirements, no temperature delay. However, the temperature range of different rare earth ions is quite different, which can not take into account all the temperature ranges. The application principle of temperature sensitive TBC based on rare earth fluorescent ions is also introduced. The coating has great advantages in the application of aeroengine temperature measurement and TBC performance testing. This paper summarizes the different material systems and their temperature detection range studied by scholars at home and abroad, and analyzes the current application status and future development trend of temperature sensitive thermal barrier coatings.