Weize Wang*, Shantung Tu, Dongdong Ye, Baohan Yuan, Ting Yang

1East China University of Science and Technology, Shanghai, 200237, P.R. China

EXTENDED ABSTRACT: With the pursuit of high parameters, large capacity and long life for special equipment such as aero engine, large steam turbine and high temperature pressure vessel, the problems of load complexity and extreme service environment are becoming more and more serious. The integrated research on the interface of mechanical structure from the perspectives of failure analysis, design and manufacturing, and damage detection is the key to ensuring its long life and safe service, which is still the bottleneck problem faced by the independent research and development of major equipment and operation and maintenance management. The damage genes and damage detection of thermal barrier coatings, which provide thermal protection for combustion chambers, high-pressure turbine blades and high-temperature turbine nozzles, were investigated in this study. The microstructure genes affecting the key performance parameters of thermal barrier coating were analyzed, and a new coating structure was proposed to prolong the life of thermal barrier coating. The research shows that the new-structure thermal barrier coating has the advantages of large strain tolerance, high fracture toughness, excellent sintering resistance and low thermal conductivity. The terahertz technology was introduced to study and detect the thickness, porosity, erosion damage and CMAS corrosion damage of thermal barrier coating. The above research results can be applied to the design, manufacture and operation maintenance of key components such as aviation and aerospace engines and large gas turbines.

Keywords: Thermal barrier coating; Damage; Terahertz; Detection