With an increased (in comparison with conventional water treatment) concentration of ozone, pesticides and hydrocarbons are effectively eliminated from water, while elimination without ozonation requires activated carbon.
Currently, the most widespread method of ozone production is its generation in the area of barrier discharge in an ozone generator. However, the performance of this equipment directly depends on the service life of the dielectric barrier, which is primarily determined by the intensity of the impact on the dielectric directly by the electric field and the high-temperature effect of the microdischarge channels, as well as by the dielectric barrier material (insulating enamel). The use of enamels makes it possible to significantly reduce the thickness of the dielectric barrier, increase the power and productivity of the ozone generator, improve the conditions for electrodes cooling, and makes it possible to create high-frequency ozone generators operating at high-frequency currents. Also, important advantages of enameled electrodes are simplicity of design, small dimensions and low specific quantity of metal. The mass of such equipment with the same performance is 10 times less than a low-frequency one. At the same time, thermal coefficient of linear expansion values level must be the same as the metal. The highest values of dielectric properties are characteristic of low-alkali and alkali-free glasses and enamels containing a minimum number of current carriers: they have higher electrical resistance and lower dielectric losses than alkaline compositions. According to literature, SiO2–PbO–B2O3–Sb2O3 chemical system glasses were selected as objects of research to obtain Pb silicate enamels, which are characterized by good flowability and high adhesion to steel, as well as high chemical resistance. When firing Pb enamels, chemical processes take place at the metal-enamel interface, which create a strong adhesion of the enamel to the substrate
The aim of this paper is to find the patterns in forming the microstructure of cermet composites prepared via spark plasma sintering. The composites consist of grained thermoelectric bismuth telluride, Bi2Te3 (a matrix of the composite), and ferromagnetic filler) Ni or Fe). It was found that under spark plasma sintering, the filler inclusions are forming as locally-gradient shell–core inclusions (Ni@NiTe2 and Fe@FeTe2), which are randomly distributed inside the textured Bi2Te3 matrix. Main parameters of composites microstructure (texturing degree and inclusions size) are strongly dependent on filler content
The article considers a possible approach to obtaining a high-temperature composite material with a matrix based on aluminum oxide reinforced with zirconium oxide. The article describes a method for manufacturing samples of ceramic composite material. A comparative study of the compositions and technological methods of manufacturing ceramic composite material is carried out. The prospects of the CСМ composition based on mullite modified with zirconium oxide are substantiated. The advantage of obtaining ССМ by semi-dry pressing is described. The choice of the further direction of development is justified
The features of batch mixing for flint and heat absorbing bronze glass melting containing selenium are considered. Methods to decrease selenium losses during glass mixture transportation and glass melting are presented. The possibility of using diatomite and soluble sodium silicate for these purposes is investigated
The dielectric characteristics of the kaolinite mass in the frequency range from 200 to 3500 kHz are investigated. The influence of the mass humidity on the values of the real and imaginary components of the permittivity is considered. The samples were obtained from clay of the Orenburg region mixed with distilled water, containing more than 70 % kaolinite with particle sizes represented by three modal maxima, microns: 0.14 +- 0.05, 1.13 +- 0.40 and 23.4 +- 2.70. It has been established that the dielectric permittivity of wet (26.5 %) samples is two times higher than that of dry (7.8 %) and three times higher than that of fired (= 0 %). It is shown that the dependence of the permittivity on humidity is approximated by a quadratic equation
The influence of a number of modifying additives: calcium fluoride, zinc oxide and boron oxide, on the melting and crystallization properties of strontium aluminosilicate glasses is considered. The influence of the type and amount of the modifying additive on the homogeneity of the molten glass and the quality of glass castings was visually evaluated. The influence of additives on the formation of the crystal structure of glasses was studied by methods of mass crystallization and XRD.
The advantages of alkoxy technology as one of the types of the sol-gel method for the synthesis of ceramics and glass ceramics are shown; an overview of the methods for the synthesis of alkoxides and oxides based on them is presented. The results of experimental studies on the production of mullite glass-ceramics using the alkox technology method are described, the structural and phase transformations of the intermediate product in the process of mullite synthesis are studied.
A technology has been developed for producing glass microspheres in a plasma reactor based on the wastes of enrichment of ferruginous quartzites KMA. The regularities of the influence of the flow rate of the plasma-forming argon gas and the power of the plasma reactor on the fractional composition have been established. It is shown that with an increase in the flow rate of the plasma-forming gas from 1.5 to 2.5 m3 / h and the current strength from 400 to 500 A due to the processes of coagulation, the amount of the fraction over 630 ?m increases. It has been shown that glass microspheres are enriched in aluminum and calcium oxides and depleted in silicon, magnesium, sodium, potassium, and iron oxides. It was found that under the action of high plasma temperatures, of the order of 9000 & # 150; 12,000 K, there is a complete melting and spherization of the particles with the formation of glass microspheres with a size of 80 to 1250 microns. The following operational parameters of glass microspheres based on the wastes of enrichment of ferruginous quartzites of KMA, such as microhardness, acid resistance and alkali resistance, have been investigated.
It is shown for the first time that the slurry evacuation method can be used within the technology of manufacturing large-size radio-technical items from quartz ceramics. According to the results of the study, it was found that evacuation of a slip based on quartz glass before molding ceramic blanks makes it possible to increase the level of density values ??of the ceramic material by 0.01 g / cm 3 and improve its uniformity by more than 30 & # 37; , as well as to reduce the number of cavities in products made of quartz ceramics by removing air from the slip
