Laser sintering of magnesia with nanoparticles of iron oxide and aluminum oxide

•Laser sintered MgO pellets with nanoparticles of Al2O3 and Fe2O3.•Characterized these pellets by XRD, SEM and XPS.•Spinel formations were observed in both cases.•Changes in morphology and structure were analyzed. Nanoparticles of iron oxide (Fe2O3, 20–40nm) and aluminum oxide (Al2O3, 50nm) were mix...

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Bibliographic Details
Published in:Applied surface science 2015-05, Vol.336, p.59-66
Main Authors: García, L.V., Mendivil, M.I., Roy, T.K. Das, Castillo, G.A., Shaji, S.
Format: Article
Language:English
Subjects:
Aluminum oxide
Fluence
Iron oxides
Irradiation
Laser sintering
Magnesium oxide
Morphology
Nanoparticles
SEM
Structure
Translations
XPS
XRD
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Summary:•Laser sintered MgO pellets with nanoparticles of Al2O3 and Fe2O3.•Characterized these pellets by XRD, SEM and XPS.•Spinel formations were observed in both cases.•Changes in morphology and structure were analyzed. Nanoparticles of iron oxide (Fe2O3, 20–40nm) and aluminum oxide (Al2O3, 50nm) were mixed in different concentrations (3, 5 and 7wt%) in a magnesium oxide (MgO) matrix. The mixture pellet was irradiated with 532nm output from a Q-switched Nd:YAG laser using different laser fluence and translation speed for sintering. The refractory samples obtained were analyzed using X-ray diffraction technique, scanning electron microscopy and X-ray photoelectron spectroscopy. The results showed that the samples irradiated at translation speed of 110μm/s and energy fluence of 1.7J/cm2 with a concentration of 5 and 7wt% of Fe2O3 presented the MgFe2O4 spinel-type phase. With the addition of Al2O3 nanoparticles, at a translation speed of 110μm/s and energy fluence of 1.7J/cm2, there were the formations of MgAl2O4 spinel phase. The changes in morphologies and microstructure due to laser irradiation were analyzed.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.09.140