Influence of Titanium Excess in a Ti–Si Reaction Mixture on the Synthesis of a Composite in a Combustion Wave

Theoretical Foundations of Chemical Engineering - On the basis of the classic concepts of the theory of solid-phase combustion, for the first time, a model with a detailed scheme of chemical...     

Production of hot-dipped tin plate 0.45–0.50 mm thick

Magnitogorsk Metallurgical Combine. Translated from Metallurg, No. 2, p. 37, February, 1991.     

Synthesis,Structure, and Physicochemical Properties of AI 4[UO2(CO3)3]·nH2O (AI = Li,Na, K,NH4)

Procedures for the synthesis of Li₄[UO₂(CO₃)₃]·1.5H₂O, Na₄[UO₂(CO₃)₃], K₄[UO₂(CO₃)₃], (NH₄)₄[UO₂(CO₃)₃], and K₃Na[UO₂(CO₃)₃] were optimized. The structures of these compounds and their thermolysis were studied by X-ray diffraction, precision IR spectroscopy, and thermal analysis. The standard enthalpies of formation of these compounds at 298.15 K were determined by reaction calorimetry.     

Synthesis, Structure, and Physicochemical Characteristics of Rutherfordite and Tetrasodium Uranyl Tricarbonate

The optimum procedures for synthesis of UO₂CO₃ and Na₄[UO₂(CO₃)₃] were developed. The structures of these compounds and their thermal decomposition were studied by X-ray diffraction, precision IR spectroscopy, and thermography. The standard enthalpy of formation of crystalline Na₄[UO₂(CO₃)₃] at 298.16 K was determined to be -4010.0±8.0 kJ mol^{- 1}.     

Kinetics and mechanism of electrode reactions in corrosion of some metals covered with oil films in acid and neutral chloride environments

Kinetics of electrode reduction reactions of dissolved molecular oxygen and hydrogen ions upon corrosion of copper and carbon steel was studied in neutral (NaCl) and weakly acidic (HCl) media. It was shown that deposition of the films comprised of trade or waste petroleum and synthetic (poly-α-olefins) oils on the studied metals does not alter the kinetic parameters of the electrode processes both in the kinetic region and in controlling mass transfer conditions. The observed regularities were explained as being results of the high porosity of the used oil films regardless of their kind.     

Initiation of the Decomposition of a Semi-Transparent Mixture of Energetic Materials

In this paper, we propose a model for the heating and decomposition of a binary mixture of energetic materials by a short laser pulse which takes into account melting and the formation of a two-phase zone and the decomposition reaction of the individual components of the mixture. A binary solution of furazanotetrazine-dioxide (C₂N₆O₃) and dinitrazapentane (C₃H₈N₄O₄) was studied as a model system. The pressure change in the reaction zone was calculated, and the effect of pressure on the rate of decomposition reactions was examined. Numerical investigations were performed to study the dynamics of the process and determine the main stages of the process: melting, the propagation of reaction zones in the mixture, the rapid development of an explosion or the termination of reactions, depending on the amount of stored energy. The influence of the optical properties of the mixture on the initiation dynamics was demonstrated.     

Modeling of evolution of growing coating composition

This paper discusses the role of coupling effects between transfer processes, chemical reactions and deformations in the evolution of phase composition of a growing coating and in the formation of a transition zone between coating and substrate. The proposed model of the coating growth is based on the equations of irreversible thermodynamics and accounts for coupling physical and chemical phenomena: diffusion, thermal diffusion, chemical reactions, elastic fields in the diffusion zone and stresses induced by diffusion. The transfer coefficients and kinetic parameters are calculated using classical theories or identified from experiments. As a result, we developed a theory that has direct practical applications and can be specified for a variety of technological and experimental situations. The formulated problem is solved numerically. The phase composition of the coating and residual stresses in the diffusion zone are obtained as a function of time under various technological conditions. The results can be used for prognosis and technology optimization.