Please use this identifier to cite or link to this item: https://repositorio.fei.edu.br/handle/FEI/3407
Title: Effects of Milling pH and Hydrothermal Treatment on Formation of Nanostructured Boehmite Binder for Alumina Extrusion
Authors: LIMA, MAURÍCIO BATISTA DE
TERCINI, MARCELA BERGAMASCHI
SANTOS, SYDNEY FERREIRA
F. S. Ortega
YOSHIMURA, HUMBERTO NAOYUKI
Issue Date: 5-Jul-2017
Abstract: The in situ formation of nanostructured aluminum hydroxides on the surface of alumina particles, which can work as inorganic binder, was reported in this paper.Theeffect of the suspension pH during milling of alumina powder and subsequent hydrothermal treatment for the hydroxide formation and microstructure was depicted. Under acidic pH condition, the formation of hydroxides was not observed.When the pH of suspension changed fromacidic to basic during milling, bayerite [Al(OH)3] nanoparticles were formed, but only a fraction of this hydroxide was converted to boehmite (AlOOH) during subsequent hydrothermal treatment. The aluminum hydroxide and oxyhydroxide formed in this condition improved the smoothness of extruded rods and the strength of presintered segments. For the powder milled under basic pH condition, themechanochemically formed bayerite was completely converted into boehmite nanoparticles during the hydrothermal treatment. The presence of boehmite nanoparticles contributed to improving plasticity during extrusion, which allowed the reduction of organic binder and increased the strength of presintered alumina rods.
Journal: Journal of Nanomaterials
ISSN: 1687-4110
Citation: LIMA, M. B.; TERCINI, M. B.; SANTOS, S.Y F.; ORTEGA, F. S.; YOSHIMURA, H. N. Effects of milling pH and hydrothermal treatment on formation of nanostructured boehmite binder for alumina extrusion. Journal of Nanomaterials, v. 2017, p. 1-14, 2017.
Access Type: Acesso Aberto
DOI: 10.1155/2017/6273095
URI: https://repositorio.fei.edu.br/handle/FEI/3407
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