VOL 90, No. 4 (2017)

The process of vacuum melting of quartz glass with stage-by-stage filling of the crucible with layers of quartz grains is described. The results obtained in the experiment indicate a decrease in defectiveness and an increase in light transmission in quartz glass obtained as a result of layer-by-layer fusion

Titanosilicates with the structure of natisite Na ₂ TiSiO ^{5 have been synthesized using titanium-silicon intermediate products formed during processing of leucoxene ores as precursors. Using the method of atomic force microscopy, the nanoscale morphological characteristics of the synthesized powders have been studied, and a sample suitable for the production of ion-conducting ceramics has been isolated.}

The synthesis of nanodispersed powders of zirconium nitride ZrN using exothermic reactions initiated by microwave radiation has been studied. The obtained ZrN powders were studied using X-ray phase analysis and scanning electron microscopy. The results obtained showed the possibility of synthesizing nanodispersed materials by exothermic reactions when heated by microwave radiation.

Using the method of electrospark sintering (SPS) on the basis of nanosized cobalt oxide powder, a fine-grained (about 200 nm), dense, durable ceramic with a microhardness of up to 10 GPa was created.

It is shown that taking into account the shape and size ratio of particles using the percolation theory makes it possible to refine the assessment of the properties of ceramic and composite materials, for example, when creating porous highly refractory oxide materials to obtain ceramic rods with improved physical and mechanical properties. The calculation results using the refined technique are in good agreement with the experimental data.

Are the results of studies to determine the granulometric composition of stone-like clay raw materials of various degrees of lithification? argillite-like clays, mudstones, shales using laser diffractometry methods. The features in the granulometric composition of these rocks, as well as the influence of the duration and intensity of their dispersion, have been revealed. The possibility of using the method of laser diffractometry in assessing the quality of this type of raw material for the production of various types of ceramic products is shown.

The chemical and mineralogical composition of the leucocratic granites of the Kargali deposit has been studied and the microstructures have been investigated using petrographic and raster-electron-microscopic analyzes. Leucocratic granite mainly consists of minerals microcline, albite and quartz and is a valuable nonmetallic ceramic raw material, which makes it possible to replace imported scarce feldspar materials in the composition of ceramic masses.

As an energy storage device in autonomous photovoltaic systems, it is proposed to use a hybrid electrochemical storage device. The developed device combines the advantages of lithium-ion batteries and double-layer capacitors. An increase in the value of energy intensity was achieved by increasing the ratio of the masses of the positive and negative electrodes

Protective coatings on the inner surface of the discharge shells of radiation sources contain oxides of aluminum, yttrium, magnesium, zirconium, and thorium. Protective coatings make it possible to increase the inertness of glass burners on the inner surface of the discharge shells in relation to vapors of corrosive metals at high temperatures and pressures, and also to increase the service life of mercury-cesium lamps by several times with a slight decrease in radiation during operation within the required values ??of their service life