Hot corrosion, high temperature oxidation and thermal shock behavior of nanoagglomerated YSZ–Alumina composite coatings produced by plasma spray method

Hot corrosion, high temperature oxidation, thermal shock resistance and tensile strength of nanoagglomerated YSZ and YSZ–5, 10 and 15wt.% Alumina composite coatings produced by plasma spraying have been studied. Findings showed that hot corrosion resistance of YSZ–5 and 10wt.% Alumina composite coat...

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Bibliographic Details
Published in:Surface & coatings technology 2013-04, Vol.221, p.133-141
Main Authors: Saremi, M., Valefi, Z., Abaeian, N.
Format: Article
Language:English
Subjects:
Applied sciences
Composite coating
Corrosion
Corrosion environments
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
High temperature oxidation
Hot corrosion
Materials science
Metals. Metallurgy
Nonmetallic coatings
Physics
Production techniques
Surface treatment
Surface treatments
Thermal shock resistance
YSZ–Alumina coating
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Summary:Hot corrosion, high temperature oxidation, thermal shock resistance and tensile strength of nanoagglomerated YSZ and YSZ–5, 10 and 15wt.% Alumina composite coatings produced by plasma spraying have been studied. Findings showed that hot corrosion resistance of YSZ–5 and 10wt.% Alumina composite coatings is higher than YSZ coating. After 21h of corrosion test, degradation of YSZ and YSZ–15wt.% Alumina coatings occurred at the interface of ceramic-bond coat while for YSZ–5 and 10wt.% Alumina coatings degradation occurred as spallation of the surface layers of coatings. After corrosion test the peak intensity ratio of t-ZrO2/m-ZrO2 for YSZ–15wt.% Alumina is higher than YSZ coating which shows better corrosion resistance of the former. Thermal shock and tensile strength test results showed a decrease in the shock resistance and tensile strength for YSZ–5 and 10wt.% Alumina coatings. High temperature oxidation of YSZ–Alumina coatings was higher than YSZ coating which shows that diffusion of O2 through grain boundaries or defects as molecules or through vacancies in the lattice structure as ions has been limited. ► YSZ–5, 10 and 15wt.% Al2O3 composite nanopowders have been sprayed by atmospheric plasma spray. ► Hot corrosion resistance of YSZ–Alumina coatings is higher than YSZ coatings. ► For YSZ–15wt.% Alumina there is more splat formation in bimodal structure which results in a higher tensile strength. ► The results of thermal shock test of coatings show the same trend observed in the tensile strength test results. ► High temperature oxidation of YSZ–Alumina coatings is higher than YSZ coatings.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.01.038