VOL 89, No. 4 (2016)

The conditions for the synthesis of zircon crystals from a solution in a melt have been studied. The use of CaCl ₂ as a flux is proposed. Samples of luminescent zircon were obtained upon activation with Dy ³⁺ and Eu ³⁺ ions. The luminescence properties of the obtained materials are investigated, a comparison is made of the luminescence spectra of pure zircon (synthesized using Li ₂ MoO ₄ and CaCl ₂ as fluxes), activated zircons and a reference YAG phosphor. The resulting activated zircon can be used as radiation converters, for example, as a red phosphor in lighting devices.

Phase transformations of model compositions of cordierite ceramics based on silicon dioxide synthesized by micellar technology have been studied by thermogravimetry, differential scanning analysis, and diffractometry. The temperature boundaries of the formation of the cordierite phase in the samples were revealed.

Is this work devoted to one of the most important areas of energy and resource conservation in metallurgy? utilization of converter slag and, as a result, an increase in the resistance of the refractory lining. Studies are presented in which, based on the chemical composition of the slag of the Polish metallurgical plant, using the Riboud and Urbain models, the dynamic viscosity of the slag was determined in the temperature range from 1500 to 1650 ° C, as well as a comparative analysis with the results of the Fact Sage program. In addition, the results of a calculation are given, which allows, with a variable FeO content in the slag from 5 to 30%, to determine its effect on the viscosity of the slag.

The porous structure of polymer and gypsum molds is analyzed. Models of their structure are proposed on the basis of the model of chaotically located spheres and the theory of percolation. The calculation expressions for evaluating the parameters of the porous structure are refined and the obtained structural parameters of the polymer and gypsum molds are given. Calculation results are presented.

The composition and properties of clays of the Tyumen region have been investigated in order to be used in the production of ceramic aggregate? keramdor. It was found that the clays are acidic, have a montmorillonite composition, are medium-dispersed, highly sensitive to drying and non-caking. Recommendations for the use of sample clay have been developed? 1 for the manufacture of ceramdor used for the construction of highways

The results of studies of filtration of melts through ceramic foam filters made on the basis of raw materials and wastes of Uzbekistan are presented. It is shown that the developed filters with a porosity of 30 ppi effectively purify the melt from exogenous non-metallic inclusions and fully correspond to the level of industrial filters of similar porosity. Filtration efficiency depends on the type and size of particles and averages 78%

The features of the use of "included pigments" for porcelain decoration are considered. The compositions of underglaze paints and colored porcelain glazes based on “included pigments” have been determined. The reasons for the occurrence of defects and the ways of their elimination are given.

The features of the manufacture of optically transparent ceramic materials for various fields of application are considered. Technologies for compacting and sintering transparent ceramics are described, including cold pressing followed by sintering in various media, hot pressing, hot isostatic pressing, spark plasma sintering, and slip casting.

Luminescent materials doped with europium ions of the composition SrAl ₂ Si ² O ₈ / LaBO ₃ using organosilicon compounds (methylpolysiloxane MK). Luminescent properties in the region of red and blue LEDs are inherent in materials synthesized at 1100 ° C. In this case, strong luminescence is inherent in trivalent europium ions (peaks at 591, 616, and 655 nm) in the red region of the spectrum and weak luminescence in the blue region of bivalent europium ions (peak at 405 nm). The possibility of embedding two types of europium cations (Eu2 + and Eu3 +) into the structure of synthesized polycrystalline materials makes it possible to regulate their spectral properties depending on the synthesis conditions