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

Document Type : Research Article


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


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


  • 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.


Main Subjects

Copyright © 2023 The Author(s). Published by IROST.

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