scholarly journals Growth Behavior of Thermally Grown Oxide Layer with Bond Coat Species in Thermal Barrier Coatings

2018 ◽  
Vol 55 (4) ◽  
pp. 344-351
Author(s):  
Sung Hoon Jung ◽  
Soo Hyeok Jeon ◽  
Hyeon-Myeong Park ◽  
Yeon Gil Jung ◽  
Sang Won Myoung ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Thermally Grown Oxide ◽  
Growth Behavior ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Thermally Grown

Formation and Growth Behaviour of Thermally Grown Oxide Layer in Thermal Barrier Coatings with HVOF Sprayed Nickel-Chromium Bond Coats

2020 ◽  
Vol 9 (2) ◽  
pp. 1-8
Author(s):  
Abdullah Selim Parlakyigit ◽  
Dervis Ozkan ◽  
Mecit Oge ◽  
Yasin Ozgurluk ◽  
Kadir Mert Doleker ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Thermal Barrier Coatings ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
Growth Behaviour ◽  
Barrier Coatings ◽  
Bond Coats ◽  
Nickel Chromium ◽  
Thermally Grown

NONDESTRUCTIVE IMPEDANCE SPECTROSCOPY EVALUATION OF THE BOND COAT OXIDATION IN THERMAL BARRIER COATINGS

2007 ◽  
Vol 14 (05) ◽  
pp. 935-943 ◽  
Author(s):  
L. YANG ◽  
Y. C. ZHOU ◽  
W. G. MAO ◽  
Q. X. LIU
Keyword(s):  
Impedance Spectroscopy ◽  
Thermal Barrier Coatings ◽  
Bond Coat ◽  
Equivalent Circuit Model ◽  
Isothermal Oxidation ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Barrier Coatings ◽  
Plasma Sprayed

In this paper, the impedance spectroscopy technique was employed to examine nondestructively the isothermal oxidation of air plasma sprayed (APS) thermal barrier coatings (TBCs) in air at 800°C. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were also used to characterize the microstructure evolution of TBCs. After oxidation, the thermally grown oxide (TGO), which was mainly composed of alumina as confirmed by EDX, formed at the upper ceramic coat/bond coat interface, the lower bond coat/substrate interface, and the bond coat. Impedance diagrams obtained from impedance measurements at room temperature were analyzed according to the equivalent circuit model proposed for the TBCs. Various observed electrical responses relating to the growth of oxides and the sintering of YSZ were explained by simulating the impedance spectra of the TBCs.

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