Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (35권2호 101-106)

Microstructural Changes of NiCrAlY/ZrO$_2$-Y$_2$O$_3$ Composite Coatings By Oxidation

NiCrAlY/ZrO$_2$-Y$_2$O$_3$ 복합코팅의 산화에 따른 조직관찰


성균관대학교 플라즈마 응용 표면기술센터;
성균관대학교 플라즈마 응용 표면기술센터;


The microstructural changes of $NiCrAlY/ZrO_2$-$Y_2$$O_3$ composite coatings that were manufactured by air-plasma-spraying were investigated using XRD and SEM/EDS. The as-sprayed microstructure consisted of (Ni,Cr)-rich regions, ($ZrO_2$-$Y_2$$O_3$)-rich regions, and $Al_2$$O_3$-rich layers that were formed during spraying owing to the oxidation of Al in NiCrAlY. During oxidation between 900 and $1100^{circ}C$ in air, Cr in the (Ni,Cr)-rich regions diffused toward the $Al_2$$O_3$-rich layers, and oxidized to be dissolved in $A1_2$$O_3$-rich layers. The oxidation of Ni in the (Ni,Cr)-rich regions was less distinct, except at the outer surface of the coating.