Advanced Materials Research Vol. 1040

Abstract: Process of synthesis of porous ceramics via organization of the filtrational mode of combustion synthesis in reactive samples preliminary structured by the method of foaming of slurry is investigated. The Al + SiO₂ + N₂ system is investigated; the target product of synthesis is β-SiAlON. It is demonstrated that high-porosity ceramic materials inheriting initial structure of the porous space of reactive systems can be fabricated in the filtrational mode of combustion synthesis. This has allowed us to vary the pore space parameters in wide ranges. The β-SiAlON based ceramic materials with total porosity from 40 to 75%, sizes of core elements 250–750 μm, sizes of porous channels 10–200 μm, and specific surface 4–15 mm^-1 have been fabricated. It is demonstrated that combustion in reactive gas flow considerably intensifies the process of combustion synthesis.

Abstract: The present study describes a synthesis of a series of iodine-benzimidazole and iodine-benzoxazole derivatives. The new and cheap method for its obtaining is developed. All compounds were characterized by physical, chemical, analytical and spectral data.

Abstract: This article presents the review and analysis of the literature on methods of utilization of sulphate lignin. It is the product obtained after the processing of cellulose. As a result of the calculations the optimal compositions of the water, organic materials with mechanical impurities with adiabatic combustion temperature about 1200 K to spontaneous combustion were determined. With help of obtained results experimental studies in plasma catalytic reactor were carried out and the also reactor’s operation was optimized. The results can be used to build industrial plants on the basis of plasma catalytic reactor for utilization sulphate lignin.

Abstract: There are shown modeling results of the joint utilization process of tributylphosphate’s spent solutions into hexachlorinebutadiene for uranium and plutonium extraction from nitric acid solution of spent nuclear fuel and its recycling wastes. Utilization process was carried out for widely temperature and mass fraction ranges of air plasma coolant. Also optimal consist of inflammable water-organic compositions and modes for practical application this process in air plasma was determined.

Abstract: A method for the trace analysis of rhodamine with colorimetric measurements based on solid-phase extraction by transparent polymethacrylate matrix is described. The quantity of sorbed РММ reagent is proportional to intensity of its painting and it depends on conditions of modification: рН, concentration of the reagent in solution and durations of processing. The interactions between PMM and rhodamine were studied by solid-phase spectrophotometry under batch conditions. The kinetic profiles of sorption at different temperatures are similar. This suggests that the sorption mechanism is mainly due to the formation of an inclusion complex through host–guest interactions.

Abstract: An investigation is performed of the filtrational combustion of gaseous hydrocarbons inside a spherical nozzle manufactured from porous Ni-Al material. The porous material is produced using the process of self-propagating high temperature synthesis, which allows an article of the desired configuration, chemical composition and porosity to be fabricated within a single technological stage. A combustion mode is demonstrated, wherein the combustion wave is localized inside the wall of the porous nozzle. Under this condition, up to 70 % of the total heat value of the fuel mixture is converted into IR flux radiated from the surface of the nozzle, with the maximum lying within the wavelength region 3–11 μm. A number of promising applications of new porous materials for designing new energy conversion devices are shown.

Abstract: The adsorption properties of mesoporous chelate containing sorbents which were prepared in two phases with europium and copper acetylacetonate complexes and PEG-115 as surfactant, were evaluated by column experiments.The adsorption properties of mesoporous silica with chelate complexes for some organic compounds were evaluated by gas chromatography. The best separation was achieved for europium acetylacetonate. From specific retention volumes measured at various temperatures the thermodynamic parameters of separation is discussed. Mutual separation of oxygen containing substances could also be demonstrated.

Abstract: The paper considers physical approach to the description of inelastic deformation of two-phase polycrystalline materials – duplex steels. Such approach is based on the introduction the key mechanisms of inelastic deformation in explicit way. The main mechanism of plastic deformation is slipping of edge dislocations. The structure of duplex steel consists of austenite and ferrite phases. At high temperatures ferrite reveals dynamic recovery (DRV) and austenite ability to undergo dynamic recrystallization (DRX). The way to describe DRV and DRX processes within the multilevel approach of elastoviscoplastic modeling is proposed. Obtained results of numerical experiments of uniaxial compression deformation at different temperatures have good qualitative agreement with experimental data.

Abstract: In this paper mathematical model of self-propagating high-temperature synthesis combined with extrusion was proposed and investigated. The problem was solved in one-dimensional formulation with consideration of viscous, thermal and concentration stresses. Evolution of temperature, density was investigated.

Abstract: A coupled isothermal model at the initial stage of a solid body surface treatment with particle flux is presented in this paper. The model takes account of the interaction of two different scale processes: impurity diffusion and mechanical stress wave propagation. The transition to dimensionless variables is briefly described. The examples of the coupled problem solution illustrating the wave interaction under the action of one pulse and two successive pulses are given.