CHARACTERIZATION OF ALUMINA MICROSPHERES PRODUCED BY COMBUSTION TORCH REMELTING
DOI:
https://doi.org/10.52292/j.laar.2023.949Keywords:
SPHEROIDIZATION, FLAME, PRODUCTION, BEADS, AL2O3Abstract
The present work investigates the thermal treatment of alumina powder with a purpose built oxygen-Liquefied Petroleum Gas torch, as a of low-cost alumina microsphere production process. In this dry process, irregularly shaped alumina particles are re-melted, acquiring a spherical shape due to surface tension. Microspheres of the stable alpha alumina phase were produced starting from two different alumina powders, both having a granule size of approximately 80 µm. In one case the initial granules are formed of micrometric crystalline particles while in the other the crystalline particles are nanometric. In both cases the resulting microspheres present similar surface texture and the predominant crystalline phase is ?-alumina. Microspheres smaller than 42 µm show a dendritic morphology on the surface with minor presence of ?-alumina. In contrast, microspheres larger than 103 µm present a smoother surface with rhombohedral grains and presence of ?-alumina.
Published
Issue
Section
License
Copyright (c) 2023 Latin American Applied Research
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Once a paper is accepted for publication, the author is assumed to have transferred its copyright to the Publisher. The Publisher will not, however, put any limitation on the personal freedom of the author to use material from the paper in other publications. From September 2019 it is required that authors explicitly sign a copyright release form before their paper gets published. The Author Copyright Release form can be found here
