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http://dx.doi.org/10.3740/MRSK.2004.14.2.110

Microstructural Observation of Scales formed on HVOF-sprayed NiCoCrAlY Coatings  

Ko J. H (성균관대학교 플라즈마 응용 표면기술센터)
Lee D. B (성균관대학교 플라즈마 응용 표면기술센터)
Publication Information
Korean Journal of Materials Research / v.14, no.2, 2004 , pp. 110-114 More about this Journal
Abstract
High velocity oxy-fuel sprayed NiCoCrAlY coatings were oxidized between 1000 and $1200^{\circ}C$ in air, and the oxide scales were examined by XRD, SEM/EDS, and EPMA. The unoxidized coatings consisted mainly of ${\gamma}$'$-Ni_3$Al, with some ${\gamma}$-Ni. The major oxide formed on the coatings was $\alpha$ $-Al_2$$O_3$. Additionally, (CoCr$_2$$O_4$, $CoAl_2$$O_4$) spinels and $Al_{5}$ $Y_3$$O_{12}$ coexisted. NiO was not found, despite of high amount of Ni in the coating. Below the oxide layer, internally formed $Al_2$$O_3$ existed.
Keywords
NiCoCrAlY coating; high velocity oxy-fuel spraying; oxidation;
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