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《China Surface Engineering》 2019-01
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Three-dimensional Microstructure of Thermal Spray Abradable Coatings

TANG Zhihui;GUO Mengqiu;ZHOU Zimin;GAO Junguo;WANG Changliang;School of Material Science and Engineering, Beihang University;Beijing Institute of Aeronautical Materials Aero Engine Corporation of China;Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Aero Engine Corporation of China;  
The abradable coating including NiCoCrAlYTa bond coating and Dy_2O_3 stablished ZrO_2 ceramic top coating was deposited on the superalloy by high velocity oxygen fuel(HVOF) and air plasma spray(APS) respectively. The threedimensional microstructure of the coating was characterized by X-ray microscopy(XRM), and the evolution of pore, interface and crack of the coating were also studied by XRM and SEM. The results show that the Ta-rich phase in the bond coating dissolves gradually oxidated at 1100 ℃ and diffuses to the grain boundaries with increasing oxidation time. The Ta phase totally dissolves after oxidation at 1100 ℃ for 60 h. Double-layer thermally grown oxides are formed between the interface of bond/top coating, and the dual oxide layers is consisted of compact alumina inner layer and mixed oxides outer layer. The mechanism of coating spalling is mainly caused by the crack defects, which preferres to propagate along the interfaces and through the pores first at high temperature.
【Fund】: 国家自然科学基金(51605455)~~
【CateGory Index】: TG174.4
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