Steklo i Keramika (Glass and Ceramics). Monthly scientific, technical and industrial journal

 

ISSN 0131-9582 (Online)

VOL 94, No. 11 (2021)

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  • Ceramics Based on Orthous Zinc with Additives Nickel and Manganese Oxides

    • Pages: 3-09
    • Views: 144
    The study of the ZnO–SnO2 system was carried out, in particular, the possibilities of the synthesis of zinc orthostannate were considered. The temperature of the synthesis of a compound from simple oxides by solid-phase synthesis has been established. Obtained ceramics based on zinc orthostannate with additives 5; 7.5; 10 mol. % NiO and 5; 7.5; 10 mol. % MnO. The properties of the powders were studied using XRD, SEM, and BET. The synthesis temperature of dense ceramics was 1450 °C
  • Properties and Structure of Iron-Containing Magnetic Glasses Based on the BaB2O4–BaSiO3 Eutectic

    • Pages: 10-15
    • Views: 138
    The magnetic and some physicochemical properties of glasses based on barium-borosilicate eutectic with additions of iron and lithium oxides have been considered. Increasing in the Fe2O3 content leads to an in-crease in the magnetic permeability. The combined introduction of Fe2O3 and Li2O has no effect on the magnetic permeability. The formation of structural configuration of barium hexaferrite in glass is responsible for the magnetic properties. According to EPR data, a part of iron ions is present in tetrahedral coordination, incorporating into the structural glass network, and the other part is present in the octahedral coordination acting as a modifier
  • Insulating Enamel Leaden-Borate Glass Basis

    • Pages: 16-22
    • Views: 143
    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
  • Microstructure Features of Cermet Based on Thermoelectric Bismuth Telluride Matrix and Ferromagnetic Filler

    • Pages: 23-29
    • Views: 148
    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
  • Production of Low-Porous Ceramics of Mullite Composition Modified with Zirconia

    • Pages: 30-35
    • Views: 177
    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
  • Features of Batch Mixing with Selenium

    • Pages: 36-42
    • Views: 115
    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
  • Dielectric Properties of Finely Dispersed Kaolinite Masses of Various Degrees of Humidity

    • Pages: 43-50
    • Views: 120
    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
  • S. S. Solntsev is 85 Years Old

    Autors: -
    • Pages: 51-52
    • Views: 111