Mechanically Alloyed Cu-Ni-Fe-O Based Materials as Oxygen-Evolving Anodes for Aluminum Electrolysis

Helle, S.; Tresse, Manuel; Davis, Boyd; Guay, Daniel; Roué, Lionel

doi:10.1149/2.028204jes

Cited by 30 publications

(15 citation statements)

References 12 publications

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“…Figure 4 shows the SEM micrographs of nanocomposites prepared by MWS and CS at different sintering parameters. All the sintered samples exhibited dense microstructures without any distinct porosity, which are similar to those reported by MWS [6], spark plasma sintering [30] and conventional cold pressing sintering [31]. The comparison of the microstructures show that conventionally sintered samples have microstructures consisting of larger particle and grain interfaces containing small pores, but the microwave sintered samples show recrystallised microstructures.…”

Section: Resultssupporting

confidence: 80%

Low temperature microwave sintering of Cu_0.7Ni_0.3(Al₂O₃) nanocomposite

2017

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In the present study, the effects of microwave sintering (MWS) on microstructural, tribological and corrosion properties of Cu 0.7 Ni 0.3 -5 wt-% Al 2 O 3 nanocomposites were evaluated. The Cu and Ni powders along with Al 2 O 3 nanopowder were mixed in a high-energy ball mill. The XRD patterns indicating formation of Cu 0.7 Ni 0.3 solid solution alloy during mechanical alloying process. The mechanically alloyed powders were compacted by coldpress, and sintered samples at 200 and 300°C for 30 and 60 min by means of conventional sintering and MWS. Tribological properties of sintered samples were evaluated by ball-on-disk wear test. For MWS, results indicate that increasing the MWS temperature decreased the wear rate about 30%. Corrosion behaviour of nanocomposites were studied by cyclic potentiodynamic polarisation in 1 M NaOH solution and was found that corrosion current density of microwave sintered sample was decreased almost 35 times of that for conventional sintered sample.

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Section: Resultssupporting

confidence: 80%

Low temperature microwave sintering of Cu_0.7Ni_0.3(Al₂O₃) nanocomposite

2017

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“…The energy balance and environmental challenges using inert anodes were discussed extensively earlier [3] [4]. Metallic, ceramic and cermet materials were tested to date and each has its advantages and disadvantages [5][6][7][8][9][10][11][12]. Metallic anodes have been showing promising results, as they possess high electrical conductivity, good thermal shock resistance.…”

Section: Introductionmentioning

confidence: 99%

Anodic process on Cu−Al alloy in KF−AlF3−Al2O3 melts and suspensions

Padamata

Yasinskiy

Polyakov

2020

Transactions of Nonferrous Metals Society of China

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Inert anode development has been a topic of interest for decades. Cu-Al, Fe-Ni based alloys have shown promising results in low-temperature melts. Metallic anodes tend to contaminate the produced aluminium with their corrosion products and introducing alumina suspension particles in the electrolyte could resolve this problem by suppressing the convective transfer of corrosion products toward aluminium produced. In this paper, anodic processes on Cu-10Al electrode in molten KF-AlF3-Al2O3 (5 wt. %) and suspensions were characterized. Effects of cryolite ratio CR ( % % 3 ), temperature and particle volume fraction (φ= 0 -0.15) on the electrochemical behaviour of the anode were demonstrated. The results suggest that CR = 1.4 at 800 °C with the particle volume fraction of not more than 0.09 are better parameters for the usage of Cu-10Al anode. At melts with φ= 0.15 at all temperatures and CR values, a low current density was observed.

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“…In this sense, one solution is the use of inert anodes in the Hall-Héroult electrolysis process, but this is still a goal that has only been partially achieved in the primary aluminum industry. The creation of a non-carbon anode has become increasingly important with increasing pressure on the aluminum industry to reduce greenhouse gas emissions [5,6].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Durability of Trimming Dies Used to Clean Anodes in the Aluminum Industry

Gârleanu

Borda

Gârleanu

et al. 2021

Metals

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Increasing the durability of trimming dies used to clean anodes is a very important goal in order to reduce the costs involved in obtaining aluminum. The research focused both on choosing an optimal material for the execution of trimming dies and on the application of technologies for plating active areas and, at the same time, on optimizing the geometric shape of the active area of the trimming die. In order to choose an optimal material from which to make the trimming dies, it was taken into account that they are usually made of X210Cr12 steel. In the stage of choosing an optimal material for the execution of the trimming dies, five steels were taken into account, namely: K105, K107, K110, K360, and K460. Analyses of the metallographic structure of the passage area were performed between the metal deposited by welding and the base material, demonstrating the fact that hot welding plating allows obtaining a more homogeneous metallographic structure compared to cold welding plating. The choice of new material was not a solution to increase the durability of the trimming die. Change in the trimming die geometry determined a reduction in deformations of about 13.8 times and of the equivalent stresses of about 7 times compared to those obtained in the case of the old trimming die. In addition, the durability of the trimming die with the new construction shape increases approximately three times compared to the trimming die with the old geometric shape. This demonstrates that the solution to increasing the durability of the trimming die is to adopt an optimal geometry of the active part at the expense of choosing an optimal material.

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Mechanically Alloyed Cu-Ni-Fe-O Based Materials as Oxygen-Evolving Anodes for Aluminum Electrolysis

Cited by 30 publications

References 12 publications

Low temperature microwave sintering of Cu_0.7Ni_0.3(Al₂O₃) nanocomposite

Low temperature microwave sintering of Cu_0.7Ni_0.3(Al₂O₃) nanocomposite

Anodic process on Cu−Al alloy in KF−AlF3−Al2O3 melts and suspensions

Increasing the Durability of Trimming Dies Used to Clean Anodes in the Aluminum Industry

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Mechanically Alloyed Cu-Ni-Fe-O Based Materials as Oxygen-Evolving Anodes for Aluminum Electrolysis

Cited by 30 publications

References 12 publications

Low temperature microwave sintering of Cu0.7Ni0.3(Al2O3) nanocomposite

Low temperature microwave sintering of Cu0.7Ni0.3(Al2O3) nanocomposite

Anodic process on Cu−Al alloy in KF−AlF3−Al2O3 melts and suspensions

Increasing the Durability of Trimming Dies Used to Clean Anodes in the Aluminum Industry

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Product

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Low temperature microwave sintering of Cu_0.7Ni_0.3(Al₂O₃) nanocomposite

Low temperature microwave sintering of Cu_0.7Ni_0.3(Al₂O₃) nanocomposite