Effects of interfacial interactions between metal and process control agents during ball milling on the microstructure of the milled Fe-based nanocrystalline alloy powder

Motozuka, Satoshi; Sato, Hisashi; Kuwata, Hidenori; Bito, Mitsuo; Okazaki, Y.

doi:10.1016/j.heliyon.2022.e10325

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…As a result, the surface area and interface area increased upon milling when a number of events of kinetic energy transfer from the milling tools into the reactive materials also increased. Changing the conditions of mechanochemical processes, such as ball-to-sample ratio, the geometry of the ball milling equipment, the presence of milling assistant agents, selection of reducer/oxidizer, and ball milling time, play a crucial role in designing the recycling process 42 , 43 . One of the possible adjustments to the proposed technology can be the increased ball milling time due to the presence of multiple non-reactive components in the reaction mixture.…”

Section: Resultsmentioning

confidence: 99%

Universal and efficient extraction of lithium for lithium-ion battery recycling using mechanochemistry

et al. 2023

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The increasing lithium-ion battery production calls for profitable and ecologically benign technologies for their recycling. Unfortunately, all used recycling technologies are always associated with large energy consumption and utilization of corrosive reagents, which creates a risk to the environment. Herein we report a highly efficient mechanochemically induced acid-free process for recycling Li from cathode materials of different chemistries such as LiCoO2, LiMn2O4, Li(CoNiMn)O2, and LiFePO4. The introduced technology uses Al as a reducing agent in the mechanochemical reaction. Two different processes have been developed to regenerate lithium and transform it into pure Li2CO3. The mechanisms of mechanochemical transformation, aqueous leaching, and lithium purification were investigated. The presented technology achieves a recovery rate for Li of up to 70% without applying any corrosive leachates or utilizing high temperatures. The key innovation is that the regeneration of lithium was successfully performed for all relevant cathode chemistries, including their mixture.

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Section: Resultsmentioning

confidence: 99%

Universal and efficient extraction of lithium for lithium-ion battery recycling using mechanochemistry

et al. 2023

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“…The amorphous ribbons produced by this process were subsequently heat treated to selectively control the formation of nanocrystallites [23,24]. Regarding the same material composition, Motozuka et al [25] determined that the amorphous and nanocrystalline structures were very well preserved by a high-energy milling process and at the same time could be easily processed from alloy scrap into a powder. Likewise, a reduction in the intensity of the X-rays reflected from the α-Fe-phase compared to the initial state was measured for ball-milled samples on the basis of XRD spectra.…”

Section: High Energy Milling and Nanocrystalline/amorphous Metalsmentioning

confidence: 99%

Modification of 316L steel powders with bronze using high energy ball milling for use as a binder component in PBF-LB/M printing of diamond-metal matrix composites

Tillmann,

Ferreira

2023

Preprint

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For the processing of diamond-metal matrix composites, the powder bed fusion using a laser for metals (PBF-LB/M), represents a new promising method for the additive manufacturing of diamond tools for concrete and rock machining, even with more complicated geometries. Previous research activities show a strong tendency for cracking and delamination during the construction process of the samples. This behavior is caused by thermal residual stresses associated with the embedded diamonds. To control these negative effects on the process side, the volume energy density is reduced accordingly, which, however, led to increased pore formation. This publication deals with an approach on the material side to modify a 316L stainless steel base powder with an addition of 20 wt% bronze via a high energy ball milling (HEBM) process in such a way that a homogeneous solid solution phase is created. A significantly increasing of the melting interval and a decreasing of both solidus and liquidus temperature was observed, which can reduce pore formation in the PBF-LB/M-process . In addition, XRD-diffractometry and SEM/EDS-analysis showed that the homogeneous solid solution phase of this alloyed powder segregates again into Fe- and Cu-rich phases when heated up to the melting point.

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“…PCAs are mostly organic molecules, which adsorb on the particle surface and thereby impede the clean particle-to-particle contact. Furthermore, it is documented that PCAs affect the energy transfer between the milling media and the precursors being milled [ 9 ], which controls the surface energy on the particles [ 10 ]. Even more, organic PCAs have been found to break down with the constituent elements during the HEM process, reacting with the raw powders [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

A Comparative DFT Study on Process Control Agents in the Mechanochemical Synthesis of PbTe

Rojas-Chávez

Miralrio

Juárez-García³

et al. 2022

IJMS

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A process control agent is an organic additive used to regulate the balance between fracturing and mechanical kneading, which control the size of the as-milled particles. Tributyl phosphate (TBP) is evaluated to act as surface modifier of PbTe, and it is compared with the results obtained using formaldehyde (CH2O). In order to elucidate the nature of the interaction between TBP and the PbTe surface, global and local descriptors were calculated via the density functional theory. First, TBP and CH2O molecules are structurally optimized. Then, vertical ionization energies as well as vertical electron affinities are calculated to elucidate how both molecules behave energetically against removal and electron gain, respectively. The results were compared with those obtained from the electrostatic potential mapped on the van der Waals isosurface. It is inferred that the theoretical insights are useful to propose adsorption modes of TBP and CH2O on the PbTe surface, which are usable to rationalize the facets exposed by PbTe after the surface treatment. The optimized structures of the compound systems showed a close correlation between the surface energy shift (Δγ) and the PbTe facets exhibited. Finally, a Wulff construction was built to compare the usage of TBP and CH2O molecules in PbTe morphology.

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Effects of interfacial interactions between metal and process control agents during ball milling on the microstructure of the milled Fe-based nanocrystalline alloy powder

Cited by 7 publications

References 34 publications

Universal and efficient extraction of lithium for lithium-ion battery recycling using mechanochemistry

Universal and efficient extraction of lithium for lithium-ion battery recycling using mechanochemistry

Modification of 316L steel powders with bronze using high energy ball milling for use as a binder component in PBF-LB/M printing of diamond-metal matrix composites

A Comparative DFT Study on Process Control Agents in the Mechanochemical Synthesis of PbTe

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