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Frontiers of Mechanical Engineering

Front. Mech. Eng.
Effect of TGO on the tensile failure behavior of thermal barrier coatings
Le WANG1,2, Yuelan DI2(), Ying LIU1(), Haidou WANG2, Haoxing YOU3, Tao LIU1
1. School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China
2. National Key Laboratory for Remanufacturing, Academy of Army Armored Forces, Beijing 100072, China
3. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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Thermally grown oxide (TGO) may be generated in thermal barrier coatings (TBCs) after high-temperature oxidation. TGO increases the internal stress of the coatings, leading to the spalling of the coatings. Scanning electron microscopy and energy-dispersive spectroscopy were used to investigate the growth characteristics, microstructure, and composition of TGO after high-temperature oxidation for 0, 10, 30, and 50 h, and the results were systematically compared. Acoustic emission (AE) signals and the strain on the coating surface under static load were measured with AE technology and digital image correlation. Results showed that TGO gradually grew and thickened with the increase in oxidation time. The thickened TGO had preferential multi-cracks at the interface of TGO and the bond layer and delayed the strain on the surface of the coating under tensile load. TGO growth resulted in the generation of pores at the interface between the TGO and bond layer. The pores produced by TGO under tensile load delayed the generation of surface cracks and thus prolonged the failure time of TBCs.

Keywords thermally grown oxides      thermal barrier coatings      acoustic emission technology      digital image correlation      pores     
Corresponding Authors: Yuelan DI,Ying LIU   
Just Accepted Date: 17 May 2019   Online First Date: 25 June 2019   
 Cite this article:   
Le WANG,Yuelan DI,Ying LIU, et al. Effect of TGO on the tensile failure behavior of thermal barrier coatings[J]. Front. Mech. Eng., 25 June 2019. [Epub ahead of print] doi: 10.1007/s11465-019-0541-2.
Specimen Plasma gas/(L?min1) Plasma gas pressure/MPa Linear velocity/(m?min1) Current/A Voltage/V Spray distance/mm Single spraying thickness/mm Carrier gas/(L?min1) Powder feed rate/(g?min1)
NiCrAlY Ar 200, H2 12.9 Ar 0.7, H2 0.5 45 400 150 100 0.02 10 40
8YSZ Ar 40, H2 3 Ar 0.7, H2 0.5 45 450 140 100 0.01 10 40
Tab.1  Spraying parameters of NiCrAlY and 8YSZ
Fig.1  TGO thickness measurement area
Fig.2  Thickness variation of TGO
Fig.3  SEM images and line sweep energy spectra of TGO at different oxidation times: (a, b) before oxidation, (c, d) at 10 h, (e, f) at 30 h, and (g, h) at 50 h
Fig.4  Variation in the surface strain of TBCs under uniform tensile load. (a) Cloud surface strain change with time; (b) strain curves of the coating surface with time
Fig.5  Corresponding relationship between stress and strain of the substrate and AE signals as they change with time under tensile load. (a) 0 h; (b) 10 h; (c) 30 h; (d) 50 h
Fig.6  Schematic of the influence of pores at the interface of TGO and the bonding layer on TBCs under tensile load
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