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

Amanmyrat Abdullayev; Celal Avcioglu; Tobias Fey; André Hilger; Markus Osenberg; Ingo Manke; Laura M. Henning; Aleksander Gurlo; Maged F. Bekheet

Open Ceramics (Mar 2022)

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

Amanmyrat Abdullayev,
Celal Avcioglu,
Tobias Fey,
André Hilger,
Markus Osenberg,
Ingo Manke,
Laura M. Henning,
Aleksander Gurlo,
Maged F. Bekheet

Affiliations

Amanmyrat Abdullayev: Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, 10623, Berlin, Germany
Celal Avcioglu: Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, 10623, Berlin, Germany
Tobias Fey: Department of Materials Science and Engineering, Institute of Glass and Ceramics, University of Erlangen-Nürnberg, Erlangen, Germany; Frontier Research Institute for Materials Science, Nagoya Institute of Technology, Nagoya, Japan
André Hilger: Institute of Applied Materials, Helmholtz Centre for Materials and Energy, Berlin, Germany
Markus Osenberg: Institute of Applied Materials, Helmholtz Centre for Materials and Energy, Berlin, Germany
Ingo Manke: Institute of Applied Materials, Helmholtz Centre for Materials and Energy, Berlin, Germany
Laura M. Henning: Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, 10623, Berlin, Germany
Aleksander Gurlo: Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, 10623, Berlin, Germany
Maged F. Bekheet: Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institute of Materials Science and Technology, Technische Universität Berlin, 10623, Berlin, Germany; Corresponding author.

Journal volume & issue: Vol. 9
p. 100240

Abstract

Read online

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.

Published in Open Ceramics

ISSN: 2666-5395 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Chemical technology: Clay industries. Ceramics. Glass
Website: https://www.journals.elsevier.com/open-ceramics

About the journal

Abstract

Keywords