Characteristic and Sinterability of Alumina-Zirconia-Yttria Nanoparticles Prepared by Different Chemical Methods

Abstract:

The characteristics and sinterability of the Al₂O₃-ZrO₂(Y₂O₃) nanoparticles produced by simple and effective microwave and molten salts methods and processed by using spark plasma sintering were studied and compared. The crystalline powders with the specific surface area in the range of 72–108 m²/g and crystallite size of 5–13 nm were obtained by calcination of samples prepared by both methods at 800 °C. The content of t-ZrO₂ phase depends on concentration of Al₂O₃, Y₂O₃ and on calcination temperature but the impact of the preparation method is insignificant. The phase transition of tetragonal ZrO₂ to monoclinic for the samples without Y₂O₃ started at 1000 °C though it was incomplete in the case of high content of Al₂O₃. The bulk materials with relative density of 86.1–98.7% were fabricated by the spark plasma sintering method at 1500–1600 °C depending on the content of Al₂O₃ and Y₂O₃.

• Periodical: Advances in Science and Technology (Volume 87)
• Pages: 30-35
• DOI: https://doi.org/10.4028/www.scientific.net/AST.87.30
• Online since: October 2014
• Authors: J. Grabis, Dzidra Jankovica, Ints Steins, Krisjanis Smits, Inta Sipola
• Keywords: Density, Microwave Synthesis, Molten Salt Synthesis, Nanoparticle, Spark Plasma Sintering (SPS), Zirconia-Alumina-Yttria Composites

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