한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제52권6호
  • /
  • Pages.283-288
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  • 2019
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
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진공 플라즈마 용사법을 통해 형성된 NiCoCrAlY 오버레이 코팅의 반복 산화 거동

Cyclic Oxidation Behavior of Vacuum Plasma Sprayed NiCoCrAlY Overlay Coatings

  • 유연우 (한국기계연구원 부설 재료연구소 표면기술연구본부) ;
  • 남욱희 (한국기계연구원 부설 재료연구소 표면기술연구본부) ;
  • 박훈관 (한국기계연구원 부설 재료연구소 표면기술연구본부) ;
  • 박영진 (한국기계연구원 부설 재료연구소 표면기술연구본부) ;
  • 이성훈 (한국기계연구원 부설 재료연구소 표면기술연구본부) ;
  • 변응선 (한국기계연구원 부설 재료연구소 표면기술연구본부)
  • Yoo, Yeon Woo (Korea Institute of Materials Science, Surface Technology Division) ;
  • Nam, Uk Hee (Korea Institute of Materials Science, Surface Technology Division) ;
  • Park, Hunkwan (Korea Institute of Materials Science, Surface Technology Division) ;
  • Park, Youngjin (Korea Institute of Materials Science, Surface Technology Division) ;
  • Lee, Sunghun (Korea Institute of Materials Science, Surface Technology Division) ;
  • Byon, Eungsun (Korea Institute of Materials Science, Surface Technology Division)
  • 투고 : 2019.10.23
  • 심사 : 2019.11.26
  • 발행 : 2019.12.31
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초록

MCrAlY overaly coatings are used as oxidation barrier coatings to prevent degradation of the underlying substrate in high temperature and oxidizing environment of the hot section of gas turbines. Therefore, oxidation resistance in high temperature is important property of MCrAlY coatings. Also, coefficients of thermal expansion (CTE) of MCrAlY have middle value of that of Ni-based superalloys and oxides, which have the effect of preventing the delamination of the surface oxides. Cyclic oxidation test is one of the most useful methods for evaluating the high temperature durability of coatings used in gas turbines. In this study, NiCoCrAlY overlay coatings were formed on Inconel 792(IN 792) substrates by vacuum plasma spraying process. Vacuum plasma sprayed NiCoCrAlY coatings and IN 792 susbstrates were exposed to 1000℃ one-hour cyclic oxidation environment. NiCoCrAlY coatings showed lower weight gain in short-term oxidation. In long-term oxidation, IN 792 substrates showed higher weight loss due to delamination of surface oxide but NiCoCrAlY coatings showed lower weight loss. X-ray diffraction (XRD) analysis showed α-Al2O3 and NiCr2O4 was formed during the cyclic oxidation test. Through cross-section observation using scanning electron microscopy (SEM) and electron back scatter diffraction (EBSD) analysis, thermally grown oxide (TGO) layer composed of α-Al2O3 and NiCr2O4 was formed and the thickness of TGO increased during 1000℃ cyclic oxidation test. β phase in upper side of NiCoCrAlY coating was depleted due to oxidation of Al and outer beta depletion zone thickness also increased as the cyclic oxidation time increased.

키워드

참고문헌

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