한국재료학회지 (Korean Journal of Materials Research)

  • 제14권2호
  • /
  • Pages.110-114
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  • 2004
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
권호 표지
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HVOF 용사된 NiCoCrAlY 코팅의 산호막 관찰

Microstructural Observation of Scales formed on HVOF-sprayed NiCoCrAlY Coatings

  • 고재황 (성균관대학교 플라즈마 응용 표면기술센터) ;
  • 이동복 (성균관대학교 플라즈마 응용 표면기술센터)
  • 발행 : 2004.02.01
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초록

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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