Microstructure and thermal properties of a promising thermal barrier coating: YTaO4 |
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| Affiliation: | 1. Nuclear Materials Development Division, Korea Atomic Energy Research Institute, 989-111 Daedeokdaero, Yuseong, Daejeon 305-353, Republic of Korea;2. Neutron Science Division, Korea Atomic Energy Research Institute, 989-111 Daedeokdaero, Yuseong, Daejeon 305-353, Republic of Korea;3. Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Republic of Korea;1. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA;2. Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, Urbana, IL 61801, USA;1. School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, Unites States;2. Materials Department, University of California, Santa Barbara, CA 93106, United States |
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| Abstract: | High temperature gas turbine sealing can increase the thermal efficiency of a gas turbine. In this paper, monoclinic phase YTaO4 ceramics were fabricated via solid-state reaction. Phase composition and microstructures of the high-temperature-sintered YTaO4 ceramics were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman Spectroscopy. Specific heat capacity rose gradually as temperature increased, due to volumetric expansion and phonon excitations. The thermal diffusivities and conductivities decreased significantly due to the effects of the porosity and phonon scattering. However, the thermal conductivities of the specimens were lower than that of 7–8 wt% yttria-stabilized zirconia (7-8YSZ), and YTaO4 ceramics have better thermal stability than current (TBCs) material. The Vickers hardnesses of YTaO4 ceramics as a function of sintering temperature were lower than that of 8YSZ, indicating YTaO4 has better fracture toughness and thermal tolerance. The results demonstrate that YTaO4 ceramics would be an excellent candidate for use as a thermal barrier coating material for high temperature gas turbines. |
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| Keywords: | Thermal barrier coatings Raman spectroscopy Thermal conductivity Vickers hardness |
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