열차폐코팅용 La_2(Zr_(1-x)Hf_x)_2O_7 산화물의 상형성과 열물성
Phase Evolution and Thermo-physical Properties of La_2(Zr_(1-x)Hf_x)_2O_7 Oxides for Thermal Barrier Coatings
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As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of La_2(Zr_(1-x)Hf_x)_2O_7 pyrochlore systems are investigated for TBC applications. La_2(Zr_(1-x)Hf_x)_2O_7 systems are comprised by selecting La^(3+) as A-site ions and Zr^(4+)/Hf^(4+) as B-site ions in A_2B_2O_7pyrochlore structures. For the developed phases in La_2(Zr_(1-x)Hf_x)_2O_7 compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these La_2(Zr_(1-x)Hf_x)_2O_7 compositions for TBC application is also discussed.
Abstract
As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of La_2(Zr_(1-x)Hf_x)_2O_7 pyrochlore systems are investigated for TBC applications. La_2(Zr_(1-x)Hf_x)_2O_7 systems are comprised by selecting La^(3+) as A-site ions and Zr^(4+)/Hf^(4+) as B-site ions in A_2B_2O_7pyrochlore structures. For the developed phases in La_2(Zr_(1-x)Hf_x)_2O_7 compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these La_2(Zr_(1-x)Hf_x)_2O_7 compositions for TBC application is also discussed.
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