Research Progress on Failure Behavior and Repair Remanufacturing of Thermal Barrier Coatings

T hermal barrier coatings(TBCs)technology is an effective means for gas turbines to reduce the surface temperature of hot-end components,resist the hot corrosion,and obtain the high thrust-weight ratio.If the coating fails,it will influence the safety of aero-engine usage.In this paper,the composition and structure of TBCs are firstly introduced.Secondly three common thermal barrier coatings failure modes including erosion and foreign object damage,sintering oxidation and corrosion are summarized.And then the repair and remanufacturing methods of damaged and failed coatings at home and abroad are elaborated.Finally the prospect of how to inhibit the crack formation and propagation and improve the reliability of TBCs is carried out.