Affiliation:
1. Beijing Institute of Technology
Abstract
Subscript textHigh-temperature chemical stabilities of Hf6Ta2O17/Al2O3, Hf6Ta2O17/YSZ and Hf6Ta2O17/Sm2Zr2O7were studied for thermal barrier coatings (TBCs). The mixed powders of Hf6Ta2O17/Al2O3and Hf6Ta2O17/YSZ were annealed at 1600°C for 8 hours in air, and the mixed powders of Hf6Ta2O17/Sm2Zr2O7were 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/Al2O3mixed 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 Hf6Ta2O17had no remarkable changes in the mixed powders of Hf6Ta2O17/YSZ and it had changes in the mixed powders of Hf6Ta2O17/Al2O3. The monocline HfO2/ZrO2phases were found in the mixed powders of Hf6Ta2O17/Sm2Zr2O7. The SEM results showed that the boundaries of Hf6Ta2O17and Al2O3crystals 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 Hf6Ta2O17crystals.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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