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Journal of the Australian Ceramic Society

, Volume 55, Issue 1, pp 135–144 | Cite as

Influence of heating rate and mechanical activation on the reaction between kaolin and aluminium powder

  • Hocine BelhouchetEmail author
  • Toufik Sahraoui
  • Khaled Belhouchet
  • Maximina Romero
Research
  • 34 Downloads

Abstract

In this work, the effect of heating rate and mechanical activation on the reaction of kaolin and aluminium powder was investigated. A batch comprised of 89.5 wt% kaolin and 10.5 wt% aluminium powders was mixed and milled in a planetary ball-mill for 1, 5, 10, 20 and 40 h. The mixture powders were heat treated with a heating rate of 5, 10, 15, 20, 30 and 40 °C/min, respectively. After milling for 20 and 40 h, the results showed the formation of free silicon, quartz and nacrite (Al2Si2(OH)4) at room temperature. The kaolinite dehydroxylation, aluminium oxidation and the θ- to α-Al2O3 transformations are highly affected by heating rate and mechanical activation. As compared with the smallest heating rate, the mixtures heated with faster heating rate show the disappearance of the peak corresponding to the oxidation of aluminium and the appearance of a second peak corresponding to the formation of α-Al2O3. The intensity of the last peak increases with increasing of the heating rate and milled at lower milling time. The effects of heating rate in the reaction of kaolin and aluminium powder are attributed to the amorphization of kaolinite, the diffusion of Al3+ to form an amorphous alumina layer on the particle surface and the generation of microcracks at the particle surface of aluminium powder.

Keywords

Heating rate Mechanical activation Kaolinite, aluminium oxidation Alumina transitions 

Notes

Acknowledgements

The authors would like to acknowledge Mrs. P. Díaz and Mrs. E. Sánchez for their technical assistance. K. Belhouchet wants to thank University Ferhat Abbas of Sétif 1 for providing financial support to carry out a scientific stay at the IETcc-CSIC.

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Copyright information

© Australian Ceramic Society 2018

Authors and Affiliations

  • Hocine Belhouchet
    • 1
    • 2
    Email author
  • Toufik Sahraoui
    • 1
  • Khaled Belhouchet
    • 3
  • Maximina Romero
    • 4
  1. 1.Non Metallic Materials Laboratory, Institute of Optics and Precision MechanicsUniversity of Ferhat Abbas Sétif 1SétifAlgeria
  2. 2.Physics Department, Faculty of ScienceUniversity Mohamed Boudiaf-M’silaM’silaAlgeria
  3. 3.Laboratory of Electrical EngineeringUniversity of Ferhat Abbas Sétif 1SétifAlgeria
  4. 4.Group of Glass and Ceramic Materials Eduardo Torroja Institute for Construccion ScienceMadridSpain

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