Research Progress of On-Line/Off-Line Phosphor Thermometry Technology for Thermal Barrier Coatings
YANG Lixia 1 , FU Yating 1 , ZHAO Xiaofeng 2 , CHEN Zhaofeng 1 , PENG Di 2 , MU Rende 3 , LIU Delin 3
1. Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Shanghai Jiao Tong University, Shanghai 200240, China ;
3. AECC Beijing Institute of Aeronautic Material, Beijing 100095, China
Abstract：Accurate temperature monitoring in thermal barrier coatings on turbine blades is of paramount importance for the design and development of aero-engines and gas turbines. Recently, a new on-line temperature measurement technology using thermal barrier sensor coatings and a new off-line temperature measurement technology using thermal history sensor coatings based on temperature-dependent phosphorescence properties of thermographic phosphors are both developed rapidly. The former obtains the real-time temperature by on-line measuring the phosphorescent signal, and the later obtains the exposure temperature by off-line measuring the irreversible changes in the phosphorescence properties after operation. Both of these technologies are suitable for non-interference, non-contact, high-precision temperature measurement of thermal barrier coatings under high temperature and high corrosion environments, and have broad application prospects. According to the introduction of the principles and methods of on-line/off-line temperature measurement in thermal barrier coatings, thermal barrier sensor and thermal history sensor materials and preparation, their applications in aero-engines and gas turbines, the research status and technical characteristics of on-line/off-line temperature measurement technology of thermal barrier coatings are described in detail. Finally, the development of the two technologies is also prospected.
2022, 
