ISSN:
1573-4889
Keywords:
thermal-barrier coatings (TBCs)
;
CVD-Al2O3
;
bond coat
;
thermal-cyclic oxidation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract State-of-the-art conventional thermal-barrier coatings consist of a thermalinsulating, partially-stabilized ZrO2 top coat and a bond coat. In this study, a continuous alumina-diffusion-barrier layer was deposited and interposed between the top coat and bond coat by chemical-vapor deposition (CVD). Both the conventional and the experimental TBC systems were cyclically tested at 1000°C, 1050°C, 1100°C, and 1150°C to evaluate and compare oxidation, performance, and fracture behavior. Introduction of the intermediate CVD-Al2O3 layer effectively suppressed the oxidation rate of the bond coat and sufficiently altered its oxidation behavior. The thermal-cyclic life of TBCs was improved by the new system. The failure of the ZrO2-8 wt.% Y2O3/CVD-Al2O3/Ni-22Cr-10Al-1Y TBC specimens was observed to propagate mainly along the lamellar splats of the top coat, and secondarily along the top coat/CVD-Al2O3 interface.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00666387
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