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NiCrAlY/ZrO₂-Y₂O₃ 복합코팅의 산화에 따른 조직관찰
박기범(G. B. Park),박진오(J. O. Park),이동복(D. B. Lee) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.2
The microstructural changes of NiCrAlY/ZrO₂-Y₂O₃ 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, (ZrO₂-Y₂O₃)-rich regions, and Al₂O₃-rich layers that were formed during spraying owing to the oxidation of Al in NiCrAlY. During oxidation between 900 and 1100℃ in air, Cr in the (Ni,Cr)-rich regions diffused toward the Al₂O₃-rich layers, and oxidized to be dissolved in Al₂O₃-rich layers. The oxidation of Ni in the (Ni,Or) -rich regions was less distinct, except at the outer surface of the coating.