Phenomena Occurring upon the Sintering of a Mixture of Yttria–Zirconia Nanometric Powder and Sub-Micrometric Pure Zirconia Powder
Autor: | Kamil Wojteczko, Katarzyna Berent, Dariusz Zientara, Zbigniew Pędzich, Krzysztof Haberko |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Technology
Materials science microstructure Sintering Article law.invention law matter transfer General Materials Science Cubic zirconia Crystallization Yttria-stabilized zirconia Powder mixture sintering Microscopy QC120-168.85 QH201-278.5 ZrO2-Y2O3 hydrothermal crystallization Microstructure Engineering (General). Civil engineering (General) TK1-9971 Chemical engineering Descriptive and experimental mechanics Electrical engineering. Electronics. Nuclear engineering TA1-2040 Electron backscatter diffraction Solid solution |
Zdroj: | Materials, Vol 14, Iss 6937, p 6937 (2021) Materials Volume 14 Issue 22 |
ISSN: | 1996-1944 |
Popis: | Mixtures of powders essentially differing in their particle morphology and size were applied to prepare polycrystals in a Y2O3-ZrO2 system. An yttria–zirconia solid solution nanometric powder with a Y2O3 concentration of 3.5% was prepared by subjecting co-precipitated gels to hydrothermal treatment at 240 °C. The crystallization occurred in distilled water. The pure zirconia powders composed of elongated and sub-micrometer size particles were also manufactured through the hydrothermal treatment of pure zirconia gel, although in this case, the process took place in the NaOH solution. Mixtures of the two kinds of powder were prepared so as to produce a mean composition corresponding to an yttria concentration of 3 mol%. Compacts of this powder mixture were sintered, and changes in phase composition vs. temperature were studied using X-ray diffraction. The dilatometry measurements revealed the behavior of the powder compact during sintering. The polished surfaces revealed the microstructure of the resulting polycrystal. Additionally, the electron back scattering diffraction technique (EBSD) allowed us to identify symmetry between the observed grains. Hardness, fracture toughness, and mechanical strength measurements were also performed. |
Databáze: | OpenAIRE |
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