VOL 93, No. 3 (2020)

Samples of electrodes with an active layer based on TiO ₂, RuO ₂ and oxides of rare earth elements Ce, La, Nd, doped with carbon nanoscale, have been obtained. The morphology of oxide electrodes was studied. Their electrochemical behavior in aqueous solutions of sodium chloride and sulfate was studied. The values ??of the current-free potentials, the values ??of the current densities and the potential regions for the release of chlorine and oxygen from aqueous solutions of sodium chloride and sodium sulfate have been determined. The dependences of the volume of released chlorine on the composition of the electrodes are presented.

Made porous ceramics based on clay and non-plastic aluminosilicate raw materials of Uzbekistan by slip casting. Molding was carried out using a blowing agent - technical foam and sawdust, stabilizing the structure, followed by firing at 1300 - 1350 ° C. The effect of various fillers on the physical and technical properties and microstructure of samples after sintering has been studied. It has been established that ceramics with a density of 700 - 900 kg / m ³ and a strength of 1.6 - 11.0 MPa can be obtained by foam technology with a mass content of foam from 15 to 25 & # 37 ;. Porous samples with the finest structure of grains and pores, obtained on the basis of Samarkand chamotte

A number of charge compositions with anthracite as the main blowing agent have been developed. The density and strength of the synthesized samples have been determined. The process of formation of a cellular structure of a heat-insulating cellular glass as a result of thermoplastic sintering of a charge at a temperature of 600 - 950 ° C is considered.

The possibility of obtaining nanofiltration membranes by applying metal oxide nanopowders on ceramic substrates with macropores is considered. As a selective layer, we chose nanopowders of titanium, aluminum, and magnesium oxides obtained by the plasma thermal method. Analysis of the initial powders, as well as the coatings after deposition, was carried out by scanning electron and atomic force microscopy. The technology of obtaining selective layers on ceramic substrates is described. A study of the characteristics of the obtained nanofiltration membranes was carried out in a laboratory setup for the desalination process.

Based on the concept of cybotaxic groups, a model of nucleation in metasilicate melts has been developed, which takes into account the thermodynamic and kinetic factors of phase transformation. The number of forming nuclei depends not only on the degree of supercooling of the melt, but also on the temperature of its pouring into the mold, during which the kinetic factor is realized.

A new technology for the formation of a multilayer mineral wool carpet by means of a pendulum zigzag layout of a primary mineral wool carpet is described, which consists in the formation of a loop with a variable height in the primary mineral wool carpet to ensure equality of the feed rate of the primary mineral wool carpet to the pendulum spreader and the peripheral speed of the pendulum at the point where the primary mineral wool carpet leaves it at the point of exit of the primary mineral wool carpet to the pendulum spreader. throughout the zigzag pattern of the primary carpet. Analytical dependencies are given for calculating the parameters of technology that implements a new method of pendulum zigzag layout of mineral wool carpet

The thermal stability of the glass coating of a pipe in the oil and chemical industry has been investigated. It was found that an increase in the thickness of the glass coating leads to a sharp deterioration in the heat resistance of the pipe coating. This phenomenon is associated with an increase in temperature gradients when heating or cooling thick coatings compared to thin pipe coatings. It was found that the high thermal resistance of the glass coating of the pipe mainly depends on the thickness, grade and geometric dimensions of the coating and steel pipe.

The influence of the presence of water-soluble low molecular weight oligomers in a paint composition on the possibility of a single high-temperature firing and decorative properties of coatings, taking into account the type of ceramic surface (porcelain or faience), the composition of pigments and the corresponding mineral fillers, has been studied. A difference was found in the color and tone of coatings, the gloss of the glaze for surfaces of various aluminosilicate modules and temperature regimes.