High-Temperature Chemical Stability of Hf6Ta2O17 Ceramic for Thermal Barrier Coatings

Miao Li; Qiang Xu; Lu Wang

doi:10.4028/www.scientific.net/KEM.512-515.635

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515High-Temperature Chemical Stability of Hf6Ta2O17...

High-Temperature Chemical Stability of Hf₆Ta₂O₁₇ Ceramic for Thermal Barrier Coatings

Abstract:

_{Subscript text}High-temperature chemical stabilities of Hf₆Ta₂O₁₇/Al₂O₃, Hf₆Ta₂O₁₇/YSZ and Hf₆Ta₂O₁₇/Sm₂Zr₂O₇ were studied for thermal barrier coatings (TBCs). The mixed powders of Hf₆Ta₂O₁₇/Al₂O₃ and Hf₆Ta₂O₁₇/YSZ were annealed at 1600°C for 8 hours in air, and the mixed powders of Hf₆Ta₂O₁₇/Sm₂Zr₂O₇ were annealed at 1200°C for 8 hours in air. The phases of the annealed mixed powders were observed by X-ray diffractometry (XRD). The sample of Hf₆Ta₂O₁₇/Al₂O₃ mixed powder was molded and sintered at 1600°C for 8 hours in air, and the microstructures of the sintered sample were investigated by scanning electron microscopy (SEM). The XRD results revealed that the crystal structure of Hf₆Ta₂O₁₇ had no remarkable changes in the mixed powders of Hf₆Ta₂O₁₇/YSZ and it had changes in the mixed powders of Hf₆Ta₂O₁₇/Al₂O₃. The monocline HfO₂/ZrO₂ phases were found in the mixed powders of Hf₆Ta₂O₁₇/Sm₂Zr₂O₇. The SEM results showed that the boundaries of Hf₆Ta₂O₁₇ and Al₂O₃ crystals were clear. The element composes in crystals were analyzed by energy dispersive spectrometer (EDS), and the EDS results showed that a little amount of Al diffused into Hf₆Ta₂O₁₇ crystals.

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Periodical:

Key Engineering Materials (Volumes 512-515)

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635-638

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.635

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Online since:

June 2012

Authors:

Miao Li, Qiang Xu, Lu Wang

Keywords:

Chemical Stability, Hf₆Ta₂O₁₇

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