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Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres

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Abstract

Oxidized aluminium microparticles have recently been proposed for manufacturing new, environmentally-friendly, protective coatings on stainless-steels and Ni-base alloys. The oxidation mechanisms of spherical aluminium microparticles of an average particle size of 3.5 μm were studied. Accordingly, simultaneous differential thermal analysis–thermogravimetry tests were carried out in air at different temperatures, always above aluminium melting temperature. Scanning electron microscopy and XRD were also used for the interpretation of results. Weight gain and energy results were explained in terms of the different structural changes taking place in aluminium particles. Dehydroxylation process was identified. The transformation of amorphous alumina to γ-Al2O3 was numerically evaluated and the alumina phase transformation (γ-Al2O3→α-Al2O3) was also studied. The temperature ranges revealed the appearance of metastable phases (θ-Al2O3). Complete oxidation of particles can be obtained at 1,300 °C in <1 h, although this also takes place at lower temperatures if enough oxidation time is used. Activation energy of oxidation process at high temperature was also estimated, taking a value of 334 kJ/mol. High temperature oxidation causes the formation of hollow alumina spheres, without any aluminium left inside them.

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Acknowledgments

This study was supported under the Project PARTICOAT (FP7-NMP-LARGE-211329) funded by the European Union. All of the colleagues involved in the Project are also gratefully acknowledged.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Universidad Carlos III de Madrid, Av Universidad 30, 28911, Leganés, Madrid, Spain

    F. Velasco, S. Guzmán, C. Moral & A. Bautista

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  1. F. Velasco
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  2. S. Guzmán
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  3. C. Moral
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  4. A. Bautista
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Correspondence to F. Velasco.

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Velasco, F., Guzmán, S., Moral, C. et al. Oxidation of Micro-Sized Aluminium Particles: Hollow Alumina Spheres. Oxid Met 80, 403–422 (2013). https://doi.org/10.1007/s11085-013-9408-9

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  • DOI: https://doi.org/10.1007/s11085-013-9408-9

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