VOL 92, No. 9 (2019)

Complex studies of phase separation in borosilicate glasses synthesized in the system of materials soda-colemanite-quartz sand have been carried out. Areas of glasses resistant to crystallization and glasses prone to phase separation have been established, the possibility of using a complex raw material of colemanite in obtaining transparent or muffled glasses in the mass has been proved, the boundaries of the content of raw materials in the material compositions of glass mixtures have been recommended.

An experience of manufacturing a complex ceramic part using the additive technology LCM (Lithography-based Ceramic Manufacturing) and an analysis of the economic feasibility of its use in serial and pilot production of ceramic parts in comparison with slip casting technology are presented.
The results obtained are of interest in the development and manufacture of new complex experimental ceramic parts and the choice of technology, batch production equipment

A porous cordierite glass-ceramic was obtained. The processes of crystallization and sintering are considered, some properties of cordierite glass-ceramics made of magnesium-aluminosilicate glass are determined. The best properties are possessed by glass-ceramic material obtained under heat treatment conditions at a temperature of the first stage T ₁ = 850 & # 176; C with an exposure & # 964; ₁ = 3 hours and a temperature the second stage in the interval T ₂ = 1315 - 1350 & # 176; C with exposure for & # 964; ₂ = 1 - 5 hours

The results of the synthesis of erbium-doped yttrium-aluminum garnet nanopowders by the glycine-nitrate method to obtain optically transparent ceramics are discussed. The effect of synthesis conditions on the characteristics of powders (Y _0.5 Er _0.5) ₃ Al ₅ O < sub> 12 and their subsequent machining for the properties of the resulting ceramics

The possibility of obtaining samples of lead-free piezoelectric ceramics using vibration molding at a pressing pressure of less than 0.3 MPa is being considered. The experiments were carried out on the material K _0.49 Na _0.49 Sr _0.02 NbO ₃, synthesized according to the standard ceramic technology of solid-phase synthesis. Piezoceramic samples made using vibration molding are similar in their characteristics to ceramic samples obtained by static pressing at a pressure of 100 - 150 MPa. The advantages of the vibration compaction process are indicated: a decrease in the cost of tools and equipment, a decrease in elastic deformation, an increase in the density of products

Studies have shown that in order to obtain a glazed ceramic material with increased heat resistance, it is necessary that the value of the TEC for the ceramic material be no more than 1.50 - 1.55 & # 37; TCLE of glaze. It was found that as a result of the liquation of glass in the glaze enriched with silica, there is a division into 3-4 regions. The liquidation structure decreases markedly at temperatures of 700 and 950 ° C. The liquation temperature range is a function of the heat treatment conditions of the glaze

The results of studies of the physical properties of a Cu / zeolite composite based on zeolite raw materials from the Kulikovskoe deposit in the Amur region are presented. To obtain the composite, the method of ion-plasma sputtering of a copper target in a vacuum was used. For the study, the methods of scanning electron microscopy, X-ray diffraction and Brunauer-Emmett-Teller analysis were used. The possibility of enrichment of the zeolite matrix with copper nanoparticles with an average diameter of 350 nm is shown.

Rheological and microstructural characteristics of aqueous suspensions of montmorillonite clays containing solid phase particles with dimensions d & # 8804; 160 microns. The dependences of the conditional viscosity of the clay solution and the values ??of the tortuosity coefficient on the volumetric clay content have been established.