High Temperature Oxidation Behavior of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition

CHEN Wenlong, LIU Min, ZHANG Jifu, SONG Jinbing, DENG Ziqian

China Surface Engineering ›› 2015, Vol. 28 ›› Issue (5) : 49-56.

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China Surface Engineering ›› 2015, Vol. 28 ›› Issue (5) : 49-56. DOI: 10.11933/j.issn.1007-9289.2015.05.008

High Temperature Oxidation Behavior of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition

  • CHEN Wenlong, LIU Min, ZHANG Jifu, SONG Jinbing, DENG Ziqian
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Abstract

Using nanoagglomerated and sintered ZrO27%Y2O3 (7YSZ) powders as raw materials, columnar crystal thermal barrier coatings (CTBCs) were prepared by plasma sprayphysical vapor deposition (PSPVD) at Nibased superalloys, and layered thermal barrier coatings (LTBCs) were prepared by atmospheric plasma spraying (APS) for comarision. The constant temperature oxidization test of the two thermal barrier coating systems was also performed at 1000 ℃. The microstructure, high temperature oxidation behavior and oxidation failure mechanisms of the thermal barrier coatings were investigated using the Xray diffraction(XRD) , scanning electron microscope (SEM), electron probe microanalysis (EPMA) and energy dispersive spectroscopy (EDS). The results indicate that a TGO layer generates quickly on the CTBC at the beginning of the oxidation, and the growth rate of the TGO layer slows down after oxidation for 50 h. The oxidation kinetics of the CTBCs can be properly expressed by the quintic power function formula, however, the LTBC oxidation kinetics curves accord with conventional quadratic parabola law. The CTBC is oxided faster than the LTBC, however, the antioxidant peeling performance is better than that of LTBC.

Key words

plasma sprayphysical vapor deposition(PSPVD); columnar YSZ; high temperature oxidation; failure mechanism

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CHEN Wenlong, LIU Min, ZHANG Jifu, SONG Jinbing, DENG Ziqian. High Temperature Oxidation Behavior of 7YSZ Thermal Barrier Coatings Prepared by Plasma Spray-Physical Vapor Deposition[J]. China Surface Engineering, 2015, 28(5): 49-56 https://doi.org/10.11933/j.issn.1007-9289.2015.05.008
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