Kinetics of Aluminum Micron Powder Oxidation in Hot Distilled Water and Product Microstructure Investigation

Grigоrenko, A. V.; Ambaryan, Grayr N.; Val’yano, G. E.; Vlaskin, Mikhail S.; Gromov, Alexander A.; Zmanovsky, Sergey V.

doi:10.1088/1757-899x/381/1/012028

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The first stage of obtaining the aluminum-alumina powder composites was the oxidation of aluminum powder by water. The oxidation process was executed in the high-pressure reactor which was described in [37]. Three kilograms of suspension of aluminum powder and distilled water (mass ratio of H 2 O/Al = 2) was added into the reactor.…”

Section: Methodsmentioning

confidence: 99%

Aluminum-Alumina Composites: Part I: Obtaining and Characterization of Powders

et al. 2019

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The process of advanced aluminum-alumina powders production for selective laser melting was studied. The economically effective method of obtaining aluminum-alumina powdery composites for further selective laser melting was comprehensively studied. The aluminum powders with 10–20 wt. % alumina content were obtained by oxidation of aluminum in water. Aluminum oxidation was carried out at ≤200 °C. The oxidized powders were further dried at 120 °C and calcined at 600 °C. Four oxidation modes with different process temperatures (120–200 °C) and pressures (0.15–1.80 MPa) were investigated. Parameters of aluminum powders oxidation to obtain composites with 10.0, 14.5, 17.4, and 20.0 wt. % alumina have been determined. The alumina content, particle morphology, and particle size distribution for the obtained aluminum-alumina powdery composites were studied by XRD, SEM, laser diffraction, and volumetric methods. According to the obtained characteristics of aluminum-alumina powdery composites, they are suitable for the SLM process.

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Section: Methodsmentioning

confidence: 99%

Aluminum-Alumina Composites: Part I: Obtaining and Characterization of Powders

et al. 2019

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“…Under normal conditions, aluminum has a ‘waterproof’, slowly hydrated, protective oxide layer on its surface [ 17 ]. Micron-sized Al powders observably react with distilled water at temperatures from 68–70 °С and higher, while nanoparticles can do that at room temperature [ 18 , 19 , 20 ]. For that reason, activation measures are needed to promote that process.…”

Section: Introductionmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Molecules

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A swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydro reactive powders via ball milling with silver powder and either lithium chloride or gallium. The latter substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al), promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those factors were responsible for obtaining lower hydrogen yields than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6 ± 0.2), (86.8 ± 1.4), (80.2 ± 0.5), and (76.7 ± 0.7)% of the expected hydrogen, respectively. Modification with Ag promoted Al oxidation, thus providing higher hydrogen evolution rates. The samples with Ag were tested in a CaCl2 solution as well, for which the reaction proceeded much more slowly. At a higher temperature (80 °C) after 3 h of experiment, the corresponding hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7 ± 2.1) and (31.8 ± 1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had the potential for further improvement to deliver higher hydrogen yields.

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“…Under normal conditions, aluminum has a 'waterproof', slowly hydrated, protective oxide layer on its surface [17]. Micron-sized Al powders observably react with distilled water at temperatures from 68-70 • C and higher, while nanoparticles can do that at room temperature [18][19][20]. For that reason, activation measures are needed to promote that process.…”

Section: Introductionmentioning

confidence: 99%

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Buryakovskaya,

Maslakov,

Borshchev

et al. 2024

Preprint

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Swarf of aluminum alloy with high corrosion resistance and ductility was successfully converted into fine hydroreactive powders via its ball milling with silver powder and either lithium chloride or gallium. The later substances significantly intensified particle size reduction, while silver formed ‘cathodic’ sites (Ag, Ag2Al) promoting Al corrosion in aqueous saline solutions with hydrogen generation. The diffraction patterns, microphotographs, and elemental analysis results demonstrated partial aluminum oxidation in the samples and their contamination with tungsten carbide from milling balls. Those effects were responsible for obtaining hydrogen yields lower than expected. For AlCl3 solution at 60 °C, Al–LiCl–Ag, Al–LiCl, Al–Ga–Ag, and Al–Ga composites delivered (84.6±0.2), (86.8±1.4), (80.2±0.5), and (76.7±0.7)% of the expected hydrogen respectively. Modification with Ag promoted Al oxidation thus providing higher hydrogen evolution rates. The samples with Ag were tested in CaCl2 solution as well, for which the reaction proceeded much slower. At a higher temperature (80 °C) after 3 h of experiment, the hydrogen yields for Al–LiCl–Ag and Al–Ga–Ag powders were (46.7±2.1) and (31.8±1.9)%. The tested Ag-modified composite powders were considered promising for hydrogen generation and had a potential for further improvement to provide higher performance.

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Kinetics of Aluminum Micron Powder Oxidation in Hot Distilled Water and Product Microstructure Investigation

Cited by 4 publications

References 7 publications

Aluminum-Alumina Composites: Part I: Obtaining and Characterization of Powders

Aluminum-Alumina Composites: Part I: Obtaining and Characterization of Powders

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

Silver-Assisted Hydrogen Evolution from Aluminum Oxidation in Saline Media

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