Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Analysis of phase formation behavior of YSZ-based composites according to rare earth and other oxide doping amounts

희토류 및 기타 산화물 Doping 양에 따른 YSZ 기반 복합소재의 상형성 거동 분석

  • Choi, Yong Seok (Korea Institute of Ceramic Engineering and Technology, Engineering Materials Center) ;
  • Lee, Gye Won (Korea Institute of Ceramic Engineering and Technology, Engineering Materials Center) ;
  • Jeon, Chang Woo (Korea Institute of Ceramic Engineering and Technology, Engineering Materials Center) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University) ;
  • Oh, Yoon Suk (Korea Institute of Ceramic Engineering and Technology, Engineering Materials Center)
  • 최용석 (한국세라믹기술원 이천분원, 엔지니어링소재센터) ;
  • 이계원 (한국세라믹기술원 이천분원, 엔지니어링소재센터) ;
  • 전창우 (한국세라믹기술원 이천분원, 엔지니어링소재센터) ;
  • 남산 (고려대학교 신소재공학과) ;
  • 오윤석 (한국세라믹기술원 이천분원, 엔지니어링소재센터)
  • Received : 2022.11.07
  • Accepted : 2022.11.25
  • Published : 2022.12.31
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Abstract

YSZ (Yttria Stabilized Zirconia) is used as a thermal barrier coating material for gas turbines due to its low thermal conductivity and high fracture toughness. However, the operating temperature of the gas turbine is rising according to the market demand, and the problem that the coating layer of YSZ is peeled off due to the volume change due to the phase transformation at a high temperature of 1400℃ or higher is emerging. To solve this problem, various studies have been carried out to have phase stability, low thermal conductivity, and high fracture toughness in a high temperature environment of 1400℃ or higher by doping trivalent and tetravalent oxides to YSZ. In this study, the monoclinic phase formation behavior and crystallinity were comparatively analyzed according to the total doping amount of oxides by controlling the doping amounts of Sc2O3 and Gd2O3, which are trivalent oxides, and TiO2, which are tetravalent oxides, in YSZ. Through comparative analysis of monoclinic phase formation and crystallinity, the thermal conductivity of the thermal barrier coating layer according to the amount of doping was predicted.

Keywords

Acknowledgement

본 논문은 산업통상자원부 소재부품기술개발-전략핵심소재 자립화 기술 개발 사업 (#20009895)의 연구지원으로 수행되었습니다.

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