| Autor: |
Abdullayev, Amanmyrat, Avcioglu, Celal, Fey, Tobias, Hilger, André, Osenberg, Markus, Manke, Ingo, Henning, Laura M., Gurlo, Aleksander, Bekheet, Maged F. |
| Zdroj: |
Open Ceramics; 20220101, Issue: Preprints |
| Abstrakt: |
In this work, polycrystalline mullite whiskers are synthesized by fluoride-assisted method from metakaolin and several aluminum-containing compounds such as γ-Al(OH)3, AlF3·3H2O, and α-Al2O3(corundum). The mullite formation and crystallization are assessed both in ex situ and in situ synchrotron X-ray diffraction experiments under synthesis conditions. Polycrystalline mullite starts to form from metakaolin, Al(OH)3, and AlF3·3H2O reactants at 680 °C, whereas mullite does not form even at 1000 °C when corundum is used. Porous mullite ceracmics are fabricated at sintering temperatures between 1000 and 1700 °C and tested for water permeance. Scanning Electron Microscopy (SEM) and synchrotron X-ray tomography (μCT) reveal that ceramics are comprised of pore channels with an interlocked network of mullite whiskers. With competitive porosity (up to 63 %), compressive strength (up to 20 MPa), and pure water flux (up to 579 L/m2·h at 1 bar), fabricated mullite ceramics are promising candidates for water filtration and purification. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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