Preparation of pure cordierite through heat treatment of combustion synthesized magnesium aluminate spinel and silica nanoparticles

Balalizadeh, Hadiseh; Abbasian, Ahmad Reza; Shafiee Afarani, Mahdi

doi:10.22104/jpst.2023.6295.1229

Preparation of pure cordierite through heat treatment of combustion synthesized magnesium aluminate spinel and silica nanoparticles

Document Type : Research Article

Authors

Hadiseh Balalizadeh

Ahmad Reza Abbasian

Mahdi Shafiee Afarani

Department of Materials Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

10.22104/jpst.2023.6295.1229

Abstract

In the present work, cordierite single-phase powders with high purity were synthesized during a two-step process. First, magnesium aluminate spinel powders were prepared via the KCl-assisted solution combustion route. Then, synthesized spinel particles and nanosilica were planetary milled for 24 h, followed by post-heating at different temperatures for 3 h. Results showed that post-heating at 700 and 900 °C did not change the sample phases. However, a magnesium aluminate spinel phase appeared for particles post-heated at 1100 °C. Further heating up to 1200 °C led to the phase transformation of amorphous silica to cristobalite, which reacted with magnesium aluminate spinel to form a cordierite phase. Finally, at 1300 °C, the remaining spinel and cristobalite reaction was completed, and single-phase cordierite powders without additional phases were obtained. Moreover, there was considerable radial shrinkage, and scanning electron microscope micrographs showed the liquid phase sintering of cordierite occurred.

Graphical Abstract

Preparation of pure cordierite through heat treatment of combustion synthesized magnesium aluminate spinel and silica nanoparticles

Highlights

Pure cordierite was synthesized by a two-step process.
Magnesium aluminate powders were prepared by solution combustion method.
Cordierite particles were obtained via solid-state reaction of silica nanoparticles and synthesized spinel powders.

Keywords

Cordierite

MgAl₂O₄ Spinel

Solution combustion synthesis

Mechanical activation

Subjects

Ceramic

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