산화물이 Doping된 YSZ의 고온 열처리에 따른 Monoclinic 상변화 및 미세구조 분석
Analysis of Monoclinic Phase Change and Microstructure According to High-temperature Heat Treatment of Oxide-doped YSZ
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
Yttria-stabilized zirconia (YSZ) has a low thermal conductivity, high thermal expansion coefficient, and excellent mechanical properties; thus, it is used as a thermal barrier coating material for gas turbines. However, during long-time exposure of YSZ to temperatures of 1200oC or higher, a phase transformation accompanied by a volume change occurs, causing the YSZ coating layer to peel off. To solve this problem, YSZ has been doped with trivalent and tetravalent oxides to obtain coating materials with low thermal conductivity and suppressed phase transformation of zirconia. In this study, YSZ is doped with trivalent oxides, Nd2O3, Yb2O3, Al2O3, and tetravalent oxide, TiO2, and the thermal conductivity of the obtained materials is analyzed according to the composition; furthermore, the relative density change, microstructure change, and m-phase formation behavior are analyzed during long-time heat treatment at high temperatures.
Abstract
Yttria-stabilized zirconia (YSZ) has a low thermal conductivity, high thermal expansion coefficient, and excellent mechanical properties; thus, it is used as a thermal barrier coating material for gas turbines. However, during long-time exposure of YSZ to temperatures of 1200oC or higher, a phase transformation accompanied by a volume change occurs, causing the YSZ coating layer to peel off. To solve this problem, YSZ has been doped with trivalent and tetravalent oxides to obtain coating materials with low thermal conductivity and suppressed phase transformation of zirconia. In this study, YSZ is doped with trivalent oxides, Nd2O3, Yb2O3, Al2O3, and tetravalent oxide, TiO2, and the thermal conductivity of the obtained materials is analyzed according to the composition; furthermore, the relative density change, microstructure change, and m-phase formation behavior are analyzed during long-time heat treatment at high temperatures.
참고문헌 (16)
- N. P. Padture, , Science, 296, pp.280~ (2002)
- D. R. Clarke, , MRS Bull, 37, pp.891~ (2012)
- W. Beele, , Surf. Coat. Technol, 120, pp.61~ (1999)
- R. A. Miller, , J. Therm. Spray Technol, 6, pp.35~ (1997)
- R. Darolia, , Int Mater Rev, 58, pp.315~ (2013)
- J. Chevalier, , J. Am. Ceram. Soc, 92, pp.1901~ (2009)
- X. Q. Cao, , J. Eur. Ceram. Soc, 24, pp.1~ (2004)
- K. Muraleedharan, , J. Am. Ceram. Soc, 71, pp.226~ (1988)
- E. H. Kisi, , Key Eng. Mater, 153, pp.1~ (1998)
- B. Basu, , J. Mater. Sci. Eng., A, 366, pp.338~ (2004)
- C. Viazzi, , J. Alloys Compd, 452, pp.377~ (2008)
- M. H. Oghaz, , J. Sol-Gel Sci. Technol, 70, pp.6~ (2014)
- M. Bahamirian, , Ceram. Int, 45, pp.7344~ (2019)
- R. L. Jones, , Surf. Coat. Technol, 82, pp.70~ (1996)
- P. Zhang, , IJOER, 1, pp.18~ (2015)
- D. Hotza, , Nano Res, 6, pp.115~ (2009)