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

 

ISSN 0131-9582 (Online)

VOL 96, No. 7 (2023)

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  • INVESTIGATION OF THE CHEMICAL INTERACTION OF HEAT-RESISTANT STEELS WITH ELECTROVACUUM GLASS G93-3M

    • Pages: 3-8
    • Views: 98
    The paper considers the issue of the possible use of stainless steel grade 20Cr23Ni18 and its foreign analogue AISI 310S, instead of steel 12Cr18Ni10T, as a material for the manufacture of a shaping die in the production of glass insulators from electrovacuum glass grade G93-3M, widely used in the radio-electronic industry as cases for magnetic contacts.
    It is shown that at working temperatures there is a chemical interaction between both steels and glass of grade G93-3M, which leads to a deterioration in the quality of products due to the appearance of a large number of gas bubbles in it.
    It has also been shown that due to additional heat treatment it is possible to reduce the consequences of this chemical interaction, thereby increasing the quality of the resulting product.
  • APPLICATION OF THERMAL PLASMA ENERGY FOR PRODUCING GLASS-CRYSTALLINE MATERIALS

    • Pages: 9-16
    • Views: 107
    The characteristics of glass-ceramic materials obtained using thermal plasma have been studied. The effect of TPP ash on the properties of glass-ceramic materials should be taken into account. Samples with a mass content of ash of 70 % were obtained. They have the following characteristics: compressive strength 530 MPa, flexural strength 110 MPa, density 3000 kg/m3.
  • METHODS OF FORMING COMPLEX PROFILE PRODUCTS FROM HEAT-RESISTANT CERAMIC MATERIALS BASED ON SILICON CARBIDE

    • Pages: 17-24
    • Views: 100
    The possibility of obtaining complex-shaped mechanical engineering products based on reaction-sintered silicon carbide using two methods - mechanical processing of polymerized blanks before sintering and hot slip molding under pressure, has been studied. The obtained silicon carbide ceramic materials are characterized by a low density of about 3.04…3.07 g/cm3, a porosity of ? 1 % and a bending strength of 320…360 MPa. Materials based on silicon carbide modified with boron carbide have a density of 2.72 g/cm3, a porosity of about 1 % and a bending strength of 280 MPa.
  • HIGH-TEMPERATURE CERAMOVERMICULITE THERMAL INSULATION ON A WOLLASTONITE BUNDLE

    • Pages: 25-34
    • Views: 88
    Ceramovermiculite thermal insulation on a wollastonite bundle was obtained from chalk, diatomite and expanded vermiculite by the method of solid-phase synthesis of components. The influence of the granulometric composition of expanded vermiculite, as well as the composition of the charge on the phase composition, physical, mechanical and thermophysical properties of ceramic materials has been studied. The main crystalline phase of ceramic samples is biotite and wollastonite. The developed ceramovermiculite thermal insulation has an apparent density from 310 to 510 kg/m3 and can be operated at temperatures up to 1050 °C inclusive. The developed materials can be used as refractory thermal insulation of industrial furnaces, equipment, etc.
  • SYNTHESIS OF A FRIT FOR OBTAINING ENAMEL COATING OF STEEL PIPES BY THE METHOD OF INDUCTION HEATING

    • Pages: 35-42
    • Views: 99
    The paper presents the results of a study of the processes of glass formation during the production of a frit by the method of induction heating. According to X-ray phase analysis, the resulting frit is completely amorphous. The frit meets the standard requirements for a 45 mm flow and a thermal expansion coefficient of 120?10–7 K–1. The enamel coating has a high chemical resistance to acids and alkalis. A comparative analysis of frit synthesis in a laboratory electric furnace using an induction heating device showed that the duration of frit induction heating is halved, energy consumption is reduced by 23 %, and the process efficiency is increased four times on average.
  • JOINT PROCESSING OF QUARTZ-LEUCOXENE CONCENTRATE AND BRUCITE CONTAINING WASTE FROM THE PRODUCTION OF REFRACTORY MATERIALS TO OBTAIN COMPLEX COAGULANTS

    Autors: Kuzin E. N.
    • Pages: 43-49
    • Views: 115
    The volumes of large-tonnage mineral waste generation cause serious concern from the side of environmental supervision. Most of the mineral waste is a valuable secondary raw material, but the lack of integrated technologies for their processing significantly slows down their processing. As part of the work, an assessment was made of the possibility of joint processing of quartz-leucoxene concentrate (waste from the oil production process) and brucite-containing waste from the production of refractories. Joint pyrometallurgical processing of two waste products made it possible to obtain magnesium titanium, a valuable product for various industries. Hydrometallurgical processing of magnesium titanate made it possible to obtain a complex magnesium-titanium-containing coagulant, which showed extremely high efficiency in the process of treating wastewater with a high pH level (concrete mixing unit). The use of a complex reagent, in addition to increasing the cleaning efficiency (reducing residual concentrations of pollutants), made it possible to reduce reagent costs and intensify the processes of sedimentation and filtration of coagulation sludge (simplification of the instrumental scheme).
  • STUDY OF THE STRUCTURAL AND MECHANICAL PROPERTIES OF SAMPLES BASED ON MAGNESIUM OXIDE FORMED IN THE PROCESS OF POLYMERIZATION OF ORGANIC BINDER

    • Pages: 50-56
    • Views: 123
    The article presents the results of a study of the influence of humidity, oxygen on the formation of the structure and strength properties of products based on magnesium oxide and organic binder SFPR-054. It has been established that carrying out the polymerization process at a temperature of 25 ?C without access to air increases the strength of the samples by about 5 times compared to samples polymerized in dry form at a temperature of 300 ?C. The obtained results suggest that the increase in the structural and mechanical properties of products based on magnesium oxide will be facilitated by the moistening of the mixture, the settling of the pressed product and the polymerization process in an oxygen-free environment or in an atmosphere of water vapor.