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  • 11
    Electronic Resource
    Electronic Resource
    The effect of sludge formed during electrolysis on the quality of copper powder (1965)
    Springer
    Powder metallurgy and metal ceramics 3 (1965), S. 224-225 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary An investigation was made of the effect of current density and electrolyte temperature on sludge formation during the electrolytic production of copper powder. With increase in current density, the relative amount of sludge formation increases and its dispersivity decreases. As the temperature rises from 25 to 55° C, the sludge formation rate changes, passing through a maximum. It is shown that, for normal industrial production of copper powder, the sludge does not significantly influence the chemical composition, dispersity or structure of the finished product particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773952
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  • 12
    Electronic Resource
    Electronic Resource
    Influence of antimony impurities in electrolyte on the electrodeposition of copper powder (1967)
    Springer
    Powder metallurgy and metal ceramics 6 (1967), S. 169-173 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary 1. In the presence of antimony compounds in electrolyte, antimony is codeposited on the cathode, which promotes the oxidation of the copper powder. 2. Small amounts (up to 0.5–1.0 mg·eq/liter) of antimony impurity in electrolyte favor the formation of loose deposits with a strongly developed dendritic particle structure, while larger amounts exert a pronounced dispersing effect on the cathodic deposit. 3. It has been shown that small amounts of antimony (up to 0.05 mg·eq/liter) have a depolarizing influence on the discharge of copper ions, while larger concentrations exhibit a passivating effect. The change in the character of the influence exerted by the impurity is ascribed to the attainment of the solubility product of basic antimony salts and antimony hydroxide in the near-cathode layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00775657
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  • 13
    Electronic Resource
    Electronic Resource
    Experience with industrial production of electrolytic powders (1992)
    Springer
    Powder metallurgy and metal ceramics 31 (1992), S. 84-88 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00793651
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  • 14
    Electronic Resource
    Electronic Resource
    Electrodeposition of nickel — Iron alloy powder (1969)
    Springer
    Powder metallurgy and metal ceramics 8 (1969), S. 341-344 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. On the basis of an investigation into the properties of various solutions, the following optimum electrolyte composition (moles/liter) was chosen: 0.2 nickel and iron (jointly) in the form of sulfates, 0.38 (NH4)2SO4, 0.07 NaF, and 0.2 KCl; pH 5. 2. It is shown that the composition of the iron-nickel alloy powder is governed by the concentration of its components in the electrolyte, but is not affected by changes in current density or electrolyte temperature. These characteristics are attributed to the fact that the limiting discharge currents of nickel and iron are similar and change in an equivalent manner under the influence of electrolysis conditions. 3. A study was made of the phase composition of the alloy as a function of nickel and iron concentrations and current density. It was established that the alloys represent a continuous series of solid solutions. 4. The influence of electrolyte composition and electrolysis parameters on the current efficiency was investigated. It was concluded that the optimum electrolysis parameters are a current density of 3000 A/m2 and a temperature of 30°C. 5. The physical properties of the alloy powders were investigated as a function of electrolysis conditions. It was found that 54% of all particles in the powder produced under the optimum conditions are 〈42μ in size, and have an apparent density of 2.85–3.0 g/cm3 and a specific surface area of 1.84×10−2 m2/g. The current efficiency under such conditions is 72–74%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00776604
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  • 15
    Electronic Resource
    Electronic Resource
    The effect of chlorides on electrodeposition of powdered copper precipitates (1969)
    Springer
    Powder metallurgy and metal ceramics 8 (1969), S. 10-15 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The authors show that, in the electrodeposition of copper powder below $$C_{Cl^ - } = 3 \cdot 10^{ - 4} $$ mole/liter, the action of chloride ions consists in their specific adsorption on the cathode. It is postulated that with $$C_{Cl^ - } \geqslant 4 \cdot 10^{ - 4} $$ mole/liter, in addition to an adsorption mechanism, a colloidal-adsorption mechanism may govern the action of Cl− owing to formation of CuClsol ultraparticles in the catholyte. 2. The dendritic character of the Cu powder particles and their surface areas increase with Ccl −, reaching a maximum value at 3·10−4 mole/liter Cl−. With a further increase in the chloride content of the electrolyte, the particles of the cathode deposit acquire an acicular shape. 3. The current yield of the copper powder increases owing to the depolarizing effect of the chloride ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774010
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  • 16
    Electronic Resource
    Electronic Resource
    Conditions of preparation and pressing behavior of copper powder (1970)
    Springer
    Powder metallurgy and metal ceramics 9 (1970), S. 615-618 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The optimum conditions have been established for the preparation of pressing-quality copper powder of increased ductility from a sulfamate electrolyte. 2. A study was made of the effect of heat treatment on the structure and properties of copper powders. It is shown that a powder subjected to heat treatment becomes more ductile. Heat treatment is particularly effective in the case of copper powder prepared from the sulfamate electrolyte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00803803
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  • 17
    Electronic Resource
    Electronic Resource
    Manufacture of copper powder by cementation in the presence of surface active agents (1976)
    Springer
    Powder metallurgy and metal ceramics 15 (1976), S. 247-249 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. Adsorption of SAA on the electrodes of contact electrolytic cells strongly affects the cementation emf and current in the deposition copper in finely divided form and hence the deposition rate and properties of the resultant powder. 2. Use of the SAA thiourea, gelatin, and chlorine ions offers an effective means of regulating the physical properties of cementation copper powder. 3. The addition of chlorine ions, unlike that of thiourea and gelatin, promotes the formation of a looser cementation deposit composed of particles with a more dendritic structure and hence increases the rate of powder deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01178188
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  • 18
    Electronic Resource
    Electronic Resource
    Role of a polyvinyl alcohol addition in the production of copper powder by electrolysis (1979)
    Springer
    Powder metallurgy and metal ceramics 18 (1979), S. 353-356 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00802318
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  • 19
    Electronic Resource
    Electronic Resource
    Effect of additions of Na, Mg, and Al cations on the flowability, apparent density, and composition of copper powder (1977)
    Springer
    Powder metallurgy and metal ceramics 16 (1977), S. 832-834 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00797035
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  • 20
    Electronic Resource
    Electronic Resource
    Electrodeposition of finely divided copper of uniform structure (1988)
    Springer
    Powder metallurgy and metal ceramics 27 (1988), S. 596-601 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions In the potentiostatic deposition of finely divided copper on a rod cathode in the over-voltage range 0.3–0.5 V the best approximation to the shape of the current vs time function is provided by a straight line. At overvoltages of 0.6 and 0.7 V an exponential and a power-type function, respectively, represent more closely experimental plots. The structure of the dendrites is determined by the magnitude of the overvoltage, and remains uniform over the whole thickness of the loose deposit, as is evidenced by micrographs of transverse sections through the cathode with the deposit. The particle size distribution, apparent density, and flowability of the electrodeposited powder are determined by the overvoltage of the cathodic process, and can be regulated by varying the parameters of galvanodynamic electrolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00795541
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