Ecofriendly alumina processing with in situ formed nanostructured boehmite binder

Yoshimura, Humberto Naoyuki; Lima, Maurício Batista de

doi:10.1016/j.matlet.2014.09.035

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…Despite the small fraction of nanometric boehmite particles obtained, this amount was sufficient to provide plasticity to the alumina powder in the extrusion test, allowing a 50% reduction in the required amount of organic binder, compared to the powder milled at pH 4. Additionally, this small amount of bohemite nanoparticles increased significantly the strength of the extruded and presintered sample, as reported in a previous work [8].…”

Section: Resultssupporting

confidence: 87%

“…Recently, it was shown that Al(OH) 3 formed by mechanochemical processing can be transformed to boehmite by hydrothermal treatment. The treated alumina powder containing particles of boehmite presented good rheological behavior during extrusion tests and resulted in formed body with high strength, allowing the reduction of organic binders' content [8].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Mechanochemical and Hydrothermal Transformations in a Wet-Milled Alumina by Transmission Electron Microscopy and Thermal Analysis

Yoshimura

Lima

Santos

et al. 2016

MSF

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Milling and hydrothermal treatment of alumina powders in aqueous medium can result in surface transformations generating aluminum hydroxides. The aim of this work was to advance the understanding on these transformations. A α-alumina powder was ball milled in water at different pHs for 10 h, and then autoclaved (150 °C, 3 atm, 3 h). The powders were analyzed by transmission electron microscopy, differential scanning calorimetry simultaneously with thermogravimetry, X-ray diffraction, and infrared spectroscopy. It was observed that milling in basic medium caused the formation of doyleite [Al (OH3)] nanoparticles, which were fully converted to boehmite (AlOOH) by hydrothermal treatment. The boehmite fraction determined by thermal analysis was 1.7 wt%. The powder milled in acid medium had no mechanochemical and hydrothermal transformations.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanochemical and Hydrothermal Transformations in a Wet-Milled Alumina by Transmission Electron Microscopy and Thermal Analysis

Yoshimura

Lima

Santos

et al. 2016

MSF

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show abstract

“…These results indicated that, besides the surface quality, the presence of aluminum hydroxide nanoparticles also contributed to increasing the strength, since they enhanced the neck formation between alumina particles during the presintering treatment. The segments with the highest strength (7.0 MPa) were those prepared with the powder milled under basic pH condition and 1.5% CMC, which were benefited by the two effects, associated with the presence of boehmite nanoparticles: the batch had good plasticity, resulting in smooth surface, and the neck formation between alumina particles was enhanced [20].…”

Section: Extrusion Behavior Of Treated Powdersmentioning

confidence: 99%

“…The aluminum hydroxides formed by mechanochemical modification of the surface of alumina particles can be converted to boehmite by a hydrothermal treatment, resulting in pastes with adequate plasticity for extrusion tests and extruded segments with high strength, allowing the reduction of organic binder content [20]. In this work, the effect of pH on the formation of aluminum hydroxides on the surface of alumina particles during wet milling is investigated.…”

Section: Introductionmentioning

confidence: 99%

Effects of Milling pH and Hydrothermal Treatment on Formation of Nanostructured Boehmite Binder for Alumina Extrusion

Lima

Tercini

Santos

et al. 2017

Journal of Nanomaterials

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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. The effect 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 from acidic 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, the mechanochemically 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.

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High strength artificial stoneware from marble waste via surface modification and low temperature sintering

Cong

et al. 2018

Journal of Cleaner Production

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Ecofriendly alumina processing with in situ formed nanostructured boehmite binder

Cited by 5 publications

References 13 publications

Evaluation of Mechanochemical and Hydrothermal Transformations in a Wet-Milled Alumina by Transmission Electron Microscopy and Thermal Analysis

Evaluation of Mechanochemical and Hydrothermal Transformations in a Wet-Milled Alumina by Transmission Electron Microscopy and Thermal Analysis

Effects of Milling pH and Hydrothermal Treatment on Formation of Nanostructured Boehmite Binder for Alumina Extrusion

High strength artificial stoneware from marble waste via surface modification and low temperature sintering

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