The effect of the particle shape and structure on the flowability of electrolytic copper powder. III. Amodel of the surface of a representative particle of flowing copper powder electrodeposited by re

Popov, I Konstantin; Krstić, Branka; Obradović, Milutin; Pavlović, Gordána; Pavlovic, J Ljubica; Ivanovic, R Evica

doi:10.2298/jsc0401043p

Cited by 13 publications

(4 citation statements)

References 8 publications

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“…3a, 4a, 5a, 6a and 7 for a CD of 150 mA cm -2 or in Figs. 3,5,9,11 As can be seen in Table II, the obtained results are in accordance with the surface area-apparent density relation. The morphologies changed to cauliflower-like, coral--like, shrub-like, and stalk-stock-like morphology with increasing of Cu ion concentrations from 0.120, through 0.15, 0.315 and 0.475, to 0.630 M Cu 2+ in 0.5 M H 2 SO 4 , respectively, at the same CD.…”

Section: Orhan and Gezginsupporting

confidence: 84%

“…4 An electrolytic metal powder represents disperse electrodeposits removed from the electrode by tapping or some other similar manner. The morphologies of copper powder particles correlated with the apparent density and flowability have been reported by Pavlović et al 9 and Popov et al 10,11 It can be seen from these investigations that the more dendritic is the structure of the powder particles, the lower is the apparent density of the copper powder. The copper electrodeposition process occurs simultaneously with the hydrogen evolution reaction.…”

Section: Orhan and Gezginsupporting

confidence: 54%

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Effect of electrolysis parameters on the morphologies of copper powder obtained at high current densities

Orhan

Gezgin

2012

JSCS

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The effects of copper ion concentrations and electrolyte temperature on the morphologies and on the apparent densities of electrolytic copper powders at high current densities under galvanostatic regime were examined. These parameters were evaluated by the current efficiency of hydrogen evolution. In addition, scanning electron microscopy was used for analyzing the morphology of the copper powders. It was found that the morphology was dependent over the copper ion concentration and electrolyte temperature under same current density (CD) conditions. At 150 mA cm-2 and the potential of 1000±20 mV (vs. SCE), porous and disperse copper powders were obtained at low concentrations of Cu ions (0.120 M Cu2+ in 0.50 M H2SO4). Under this condition, high rate of hydrogen evolution reaction took place parallel to copper electrodeposition. The morphology was changed from porous, disperse and cauliflower-like to coral-like, shrub-like and stalk-stock like morphology with the increasing of Cu ion concentrations towards 0.120 M, 0.155 M, 0.315 M, 0.475 M and 0.630 M Cu2+ in 0.5 M H2SO4 respectively at the same CD. Similarly, as the temperature was increased, powder morphology and apparent density were observed to be changed. The apparent density values of copper powders were found to be suitable for many of the powder metallurgy applications

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Section: Orhan and Gezginsupporting

confidence: 84%

Section: Orhan and Gezginsupporting

confidence: 54%

Effect of electrolysis parameters on the morphologies of copper powder obtained at high current densities

Orhan

Gezgin

2012

JSCS

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“…For these purposes, an increased current density is used, a reduced concentration of the main component [1] and additives of chloride ions [2,3], and ac-pulse polarization modes, and an additive soluble polymers [4 -6] unsteady electrolysis electrohydrodynamic modes [7 -9], special preparation of the surface of the cathode [10]. Many studies have noted the need to find the optimal combination of all factors that determine the size distribution of the product [11,12]. For these purposes, the methods of experimental design are commonly used [13], as well as the value of the limiting current polarization curves [14,15].…”

Section: Intorductionmentioning

confidence: 99%

The Mechanism of Water-Soluble Polymer Аdditives and Parameters of the Pulse Electrolysis Effect on the Size Distribution of the Electrolytic Copper Powder

Липкин

Lachin

2016

MSF

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The principles of pulse electrolysis modes selection and their effect on the size distribution of the powder electrolytic copper in electrolyte with additions of water-soluble polymers, polyvinylpyrrolidone (PVP) and polyacrylamide (PAA) are considered in the paper. The research conducted with use of chronopotentiometry and potential transients as well as a simulation model of the electrocrystallisation process showed that the values of pulse duration were greater than the transient time of electroactive species and the pause duration equal to the linear part of potential transient was optimum to obtain a powder with a predominant fraction of nanoscale particles . PVP and PAA additives help to reduce the average particle size in the nanoscale fraction copper powder particles to 25-40 nm. Selected current pulse mode effect corresponds to the reduction of the emergence of new centers of crystallization probability and the adatoms on the surface of the cathode movement probability.

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“…Some of the important physical properties of electrolytic copper powders are apparent density, particle size distribution, copper purity for high conductivity [4], grain shape [5], current efficiency, and volume ratio of grains [6][7][8]. Winand [9] found in studying electrocrystallization that many parameters affected the type of copper deposit on the cathode in an electrolytic cell, namely, current density, concentration of metal ions [10], temperature of electrolytes [11], impurity of anions and cations, agitation within the electrolytic cell [12], concentration of sulphuric acid, circulation rate of electrolytes [13], electrode spacing, removal time of powders from electrolytes [14], and concentration of organic compounds as a modifier [15][16].…”

Section: Introductionmentioning

confidence: 99%

Comparison of effective parameters for copper powder production via electrorefining and electrowinning cells and improvement using DOE methods

Akbarzadeh

Shakib

2011

Int J Miner Metall Mater

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The influences of cupric ion concentration (5-35 g/L), current density (500-2000 A/m 2 ), circulation rate of the electrolyte solution (15-120 mL/min), and temperature (25-60°C) on the physical and chemical properties of copper powders obtained in electrolysis cells were investigated. Two industrial processes, electrorefining (ER) cells with a synthetic electrolyte and electrowinning (EW) cells with an original solution of copper mineral leaching, were utilized to produce copper powders. Finally, the statistical full factorial method of design of experiments (DOE) was employed to investigate the interaction or the main effects of processes. The results show that increasing the copper concentration and temperature can increase the grain size, apparent density, and electrical energy consumption. On the other hand, increasing the current density and circulation rate of the electrolyte can decrease them. This production process is optimized via DOE to control the interactive and main effects to produce copper powders with favorable properties.

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The effect of the particle shape and structure on the flowability of electrolytic copper powder. III. Amodel of the surface of a representative particle of flowing copper powder electrodeposited by re

Abstract: The structure of the surface of copper powder particles is discussed and correlated with the lowest apparent density at which copper powder can still flow. It is shown that such structures can be easily obtained in the electrodeposition of powders in reversing current regimes.

Cited by 13 publications

References 8 publications

Effect of electrolysis parameters on the morphologies of copper powder obtained at high current densities

Effect of electrolysis parameters on the morphologies of copper powder obtained at high current densities

The Mechanism of Water-Soluble Polymer Аdditives and Parameters of the Pulse Electrolysis Effect on the Size Distribution of the Electrolytic Copper Powder

Comparison of effective parameters for copper powder production via electrorefining and electrowinning cells and improvement using DOE methods

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