Fabrication and characterization of porous mullite ceramics derived from fluoride-assisted Metakaolin-Al(OH)3 annealing for filtration applications

Open Ceramics

André Hilger¹  Tobias Fey²  Celal Avcioglu³  Amanmyrat Abdullayev³  Maged F. Bekheet³  Aleksander Gurlo³  Laura M. Henning⁴  Markus Osenberg⁴  Ingo Manke⁴ 

[1] Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya, Japan;Department of Materials Science and Engineering, Institute of Glass and Ceramics, University of Erlangen-Nürnberg, Erlangen, Germany;Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, 10623, Berlin, Germany;Institute of Applied Materials, Helmholtz Centre for Materials and Energy, Berlin, Germany;

关键词: Mullite whiskers;    Ceramic membranes;    Water filtration;    In situ synchrotron X-ray diffraction;    Synchrotron X-ray tomography (μCT);   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown