Oxidation behavior of thermal barrier coatings with HVOF and detonation-sprayed NiCrAlY bondcoats

The high-velocity oxygen-fuel (HVOF) technology was employed to deposit the bondcoat of a thermal barrier coating (TBC) system. The isothermal oxidation rate at 1100 °C of the TBC system with the HVOF bondcoat is two times lower than that of the TBC system with the detonation-sprayed bondcoat. The b...

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Bibliographic Details
Published in:Corrosion science 2008-06, Vol.50 (6), p.1608-1617
Main Authors: Yuan, F.H., Chen, Z.X., Huang, Z.W., Wang, Z.G., Zhu, S.J.
Format: Article
Language:English
Subjects:
A. Thermal barrier coatings
Applied sciences
B. Detonation spray
B. High-velocity oxygen-fuel spray
C. Oxidation
C. Thermally grown oxide
Corrosion
Corrosion environments
Exact sciences and technology
Metallic coatings
Metals. Metallurgy
Nonmetallic coatings
Production techniques
Surface treatment
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Summary:The high-velocity oxygen-fuel (HVOF) technology was employed to deposit the bondcoat of a thermal barrier coating (TBC) system. The isothermal oxidation rate at 1100 °C of the TBC system with the HVOF bondcoat is two times lower than that of the TBC system with the detonation-sprayed bondcoat. The better isothermal oxidation resistance of the TBCs with HVOF sprayed bondcoats demonstrates that unlike alumina dispersoids in the HVOF sprayed bondcoat, rough surface of the detonation-sprayed bondcoat is undesirable for the detonation-sprayed TBC system concerning oxidation due to a large specific surface area and unfavorable oxides on the bondcoat.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2008.02.002