Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Microstructural Observation of Scales formed on HVOF-sprayed NiCoCrAlY Coatings

HVOF 용사된 NiCoCrAlY 코팅의 산호막 관찰

  • 고재황 (성균관대학교 플라즈마 응용 표면기술센터) ;
  • 이동복 (성균관대학교 플라즈마 응용 표면기술센터)
  • Published : 2004.02.01
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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.

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