Liquid-phase flash sintering 8YSZ with alkali halide sintering aids
| Autor: | R. Muccillo, Julio Cesar Camilo Albornoz Diaz |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Sintering 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Dielectric spectroscopy Grain growth visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Melting point Ceramic Composite material Electric current 0210 nano-technology Joule heating Current density |
| Zdroj: | Journal of the European Ceramic Society. 40:4299-4303 |
| ISSN: | 0955-2219 |
| Popis: | The properties of ZrO2: 8 mol% Y2O3 (8YSZ) ceramics with LiF and KCl sintering aids for liquid phase formation during electric field-assisted sintering were studied. Sintering experiments were carried out at 650 °C under 200 V cm−1 AC electric field by varying current density, current application time, as well as LiF and KCl contents. Pellets sintered with KCl addition had cavities, cracks and fractures. Pellets sintered with 15 wt.% LiF, on the other hand, were homogeneous after thermal removal of LiF upon Joule heating. Low electric current densities coupled with longer application times produced homogeneous specimens. Three different stages were identified during sintering experiments: (i) LiF melting with the electric field applied at furnace temperatures lower than its melting point, (ii) shrinkage due to liquid phase formation and LiF removal, (iii) final densification due to grain growth and pore elimination. The electrical behavior and an estimate of the porosity were carried out by electrochemical impedance spectroscopy measurements. |
| Databáze: | OpenAIRE |
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