A. I. Ananiev, A. M. Baklunov, E. Yu. Muryshev, V. G. Shevchenko

ABSTRACT:

The results of the work show that impulse actions can significantly change the structure and properties of the material, due to the anomalous diffusion mobility of the alloying element, its adsorption characteristics at the interfaces.

KEY WORDS:

aluminum, impact, current, structure.

A. L. Bel’tyukov, N. V. Olyanina, V. I. Lad’yanov

ABSTRACT:

Using the method of torsional vibrations we have studied the effect of the boundary conditions at the upper boundary of the melt as well as methods of sample pretreatment on the measurement results of the viscosity of the Co–Si melts. It is shown that peculiarities associated with film effects, wetting and processes of raw materials melting during heating can occur on the temperature dependence of the logarithmic decrement. The experimental conditions excluding the impact of these effects have been defined. Viscosity polytherms of the liquid alloys with a silicon content 18, 32 and 40 at % during heating and subsequent cooling were also obtained. Viscosity polytherms obtained in the heating and cooling modes coincide and are well described by the Arrhenius equation.

KEY WORDS:

the method of torsional vibrations, logarithmic decrement, face surface of the friction, viscous film, kinematic viscosity, polytherm, melt

A.N.Efremov, Yu.R.Khalimullina, P.S. Pershin, P.A. Arkhipov, Yu.P.Zaikov

KEYWORDS:

current distribution, liquid-metal electrodes, electrolyzer, electrical conductivity, molten salt.

ABSTRACT:

An influence of the molten electrolyte composition on  the direct current distribution over the surface of liquid-metal anode and through the volume of the KCl-PbCl₂ electrolyte in electrolyzer of a cylindric shape was investigated. A method of the electric field construction was used. A graphical dependence of the volume current density distribution was evaluated. A melt specific electrical conductivity was estimated.

E.V. Nikitina, N.A. Kazakovtseva

KEYWORDS:

electrochemical system, dissipative structures, masstransfer, fluctuations, electrode potential.

ABSTRACT:

A hydrodynamic situation and masstransfer in case of vertical plate electrodes, made of nickel, placed into an alkali carbonate melt with diffusion overvoltage and without it was studied. A linear dissipative structure in the form of the concentration distribution between cathode and anode appears during electrolysis in the electrochemical system.

G.B. Smirnov, A.A. Fokin, S.E. Markina, A.I. Vakhitov

KEYWORDS:

imitating modeling, cathode matrix, optimization, melts electrolysis.

ABSTRACT:

The results of imitating modeling of the  cathode deposit growth process in electrolyzer-refiner of coaxial symmetry were presented. The optimization of the initial cathode matrix sizes was carried out. A comparison of the data obtained by modeling and by the natural experiments on the example of the platinum deposition from molten salt was performed.

S.A. Istomin, A.A. Khokhryakov, V.V. Ryabov, A.V. Ivanov, A.S. Pajvin

Keywords: melt, boron oxide, REO oxides, mechanoactivation, viscosity, structure.

 Abstract: The viscosity values of borate melts containing 1 wt% of REO from lanthanide group in the temperature range of 1100-1700 K were measured with the use of vibrational viscosiometer. The activation energy of viscous flow was calculated. A stagger viscosity dependence at increasing the  atomic number of the lanthanide in the range of studied melts , is subjected to in-row periodicity (tetrad effect). The deviations from tetrad effect is caused by  a formation of two-valent rare-earth ions in the melt.

S.A.Lyamkin, N.S. Semenova

KEYWORDS:

oxidation, solid carbon, oxide melt, pressure, current exchange.

ABSTRACT:

According to the electrochemical mechanism of reaction  for oxides reduction from the molten slag  by a solid carbon, its anode oxidation can be described as a sum reaction C+O^2— – 2e=CO, which often is a limiting stage of all process. However, the influence of the gas phase pressure on kinetic parameters of this reaction, allowing more reliably describing its course and limiting stages, is still unclear. That is why the authors of this work suggested a kinetic scheme of the solid carbon anode oxidation process in oxide melt considering the pressure change.

Kh.B. Kushkhov, A.K. Abazova, M.K. Vindijeva, R.A. Mukojeva

KEYWORDS:

cyclic voltamperometry, co-electroreduction, electrochemical synthesis, cerium silicide.

ABSTRACT:

The experimental results related to the process of co-electroreduction of cerium ions and fluorine silicate ions on tungsten electrode in the  K, Na//Cl equimolar melt at 973 K were presented. The optimized regimes of the high-temperature electrochemical synthesis of compounds based on cerium and silicon were determined with the use of volt-amps investigations.

V.E. Krtotov. E.S. Filatob

KEYWORDS: molten salt electrolyte, electrolysis conditions, cathode deposit, UO₂-ZrO₂, quantitative composition, calculation and experiment.

Abstract: A method was proposed and a calculation of the ZrO₂ content in the (NaCl-KCl)_equiv-UO₂Cl₂-ZrCl₄ melt for different values of current density (0.08-0.63 A/cm²) and the ZrCl₄ concentration (0-12.3wt%) was carried out on the base of  known composition for one UO₂-ZrO₂ cathode deposit.  A qualitative and satisfactory quantitative accordance of calculated and experimental values of the ZrO₂ content in the UO₂-ZrO₂ cathode deposits was established.