https://elib.belstu.by/handle/123456789/20518 Mon, 06 Apr 2026 19:15:42 GMT 2026-04-06T19:15:42Z https://elib.belstu.by/handle/123456789/20960 Title: Glass-ceramic cement for vacuum-tight joint Authors: Levitskii, I. A.; Papko, L. F.; Dyadenko, M. V. Abstract: Synthesis of fusible glass of ZnO – PbO – B[2]O[3] system at the maintenance of components, wt %: B[2]O[3] – 10–45; ZnO – 5–40; PbO – 50–85 is carried out. It was established that stability of a vitreous state is defined by a ratio of ZnO / (PbO + B [2]O[3]) in the glass composition. Dependences of thermal and rheological characteristics of glass systems of ZnO – PbO – B[2]O[3] from a chemical composition are studied. The increase in the maintenance of B[2]O[3] superseded by PbO causes the essential growth of viscosity and decreas e of its gradient. The components able to reduce viscosity are arranged in the following way: B[2]O[3]→ZnO →PbO. By the results of research of glass rheological properties of ZnO – PbO – B[2]O[3] system, the area of glass compositions with viscosity less than 10{5} Pa · s at a temperature not over 450°C that provides the demanded spreadability indicators is defined. Regulation of indicators of TCLE is reached by creation of compositions glass – a crystal filler. Influence of such crystal filler as zircon, spodumene, cordierite on properties of composite glass-ceramic cement is re searched. The target TCLE indexes being equal to (77 ± 1) · 10{–7} K{–1} are achieved by the introduction of a spodumene. The composite glass-ceramic cement, intended for vacuum-tight connections of fiber-optical elements with a metal frame was developed. TCLE indexes of the glass-ceramic cement are equal to 77.2 · 10{–7} K{–1}, that coordinates it with TCLE containing a fiber-optical element. Temperature of composite glass-ceramic cement soldering is 450 ± 5°C, temperature of its deformation – 520 ± 5°C. Thu, 01 Jan 2015 00:00:00 GMT https://elib.belstu.by/handle/123456789/20960 2015-01-01T00:00:00Z https://elib.belstu.by/handle/123456789/20955 Title: Production of toughened sheet glasses of thin nominals Authors: Pavlyukevich, Yu. G.; Kravchuk, A. P. Abstract: An experimental apparatus for forming thin nominals glass by vertical drawing has been developed. The character and duration of transients in the area of sheet glass molding with thickness less than 2 mm in the stability of their geometri c parameters and physicochemical properties have been researched. The time-temperature regimes of drawing of thin nominals sheet glass have been determined. It was found that their molding should be carried out in the temperature range of 840–850°C (glass viscosity 10{4.8}–10{5} Pa · s), since the detaching effect of surface tension forces does not lead to significant narrowing ribbon of the glass. According to the parameters of glass surface quality, glass drawn in this temperature range resembles float glass to some extent. However, it is characterized by the lower thickness (0.5 mm). The temperature increase to 900–950°C (in the active forming zone) causes the decrease of the surface quality and a significant narrowing of the glass ribbon at the expense of forces of surface tension. Being formed in the temperature range of 800–750°C on the roller drawing device the glass ribbon requires more effort high. It reduces the efficiency of the process. The researches of toughness of thin nominals sheet glass demonstrate that the low-temperature ion-exchange treatment in the KNO 3 melt at the temperature of 400–500°C causes significant increase of strength, microhardness and glass heat resistance. The concentration of K {+} ions exercises a decisive impact on glasses properties in this temperature range. Being processed the K{+}ions diffuse to a depth of 10–15 µm of a surface layer of the glass and cause high values of compressive stress. Thu, 01 Jan 2015 00:00:00 GMT https://elib.belstu.by/handle/123456789/20955 2015-01-01T00:00:00Z https://elib.belstu.by/handle/123456789/20952 Title: Microstructured high-alumina ceramics for filtration of disperse systems Authors: Pavlyukevich, Yu. G.; Hundzilovich, N. N. Abstract: Microstructured materials were derived from ceramic masses including alumina GK-2 as a filler, and clay Keramik-Vesko, glass HT-1, gibbsite as a binder. It was found that addition of gibbsite in the binder composition intensifies the formation of mullite in binder as well as on a surface of the grains of the filler. Produced by the thermal dissociation of gibbsite γ-Al2O3 has a high chemical activity and increases crystalliz ation, thereby values of mechanical strength. It was found that additions of HT-1 glass in the binder composition intensify sintering processes of the material due to active physical and chemical interactions between the components of the binder and filler particles to produce eutectic compositions. HT -1 glass is aluminoborosilicate composition. It is chemically and thermally resistant thereby its addition does not decrease the physicochemical properties of the ceramic filter and can reduce the sintering temperature of the material. The pore structure of synthesized material is represented by an extensive network of open pores having an average diameter of 10 µm. It makes them suitable for microfiltration disperse hydrosystems: water treatment, purification of dairy products, blood products, corrosive liquids, etc. Thu, 01 Jan 2015 00:00:00 GMT https://elib.belstu.by/handle/123456789/20952 2015-01-01T00:00:00Z https://elib.belstu.by/handle/123456789/20950 Title: Phosphates purification of waste water by natural materials and industrial wastes (comparative study) Authors: Sapon, Ye. G.; Martsul, V. N. Abstract: The management phosphates in freshwater has significant importance to regulate eutrophication. Phosphate excess leads to highly undesirable changes in ecosystems st ructure. The increasing of water body trophicity can result in water quality deterioration. This paper presents the testing results of reactive materials used for phosphorus removal from wastewater at sewage treatment plant. Twelve materi als of different origin available in Belarus were tested as potential reactive material s for phosphates removal. They are natural materials, industrial by-products and manufactured sorbents. Based on chemical composition the available and inexpensive materials rich in Al, Fe, Mg and Ca were selected. Relationship between purification degree of phosphates and specific material consumption (mg/mg PO[4]{3–} ) was investigated to choose potential reactive materials for phosphorus. Four materials (wa-ter conditioning sludge (WCS), dead-catalyst of petroleum hydrocarbon cracking (DCC), electric arc furnace slug (EAF-slug), dolomite burnt at 700°C) have been chosen for detailed sorption tests. WCS, DCC, EAF-slug and burnt dolomite have the apparent sorption capacities of: 13.6; 21.2; 35.3; 70.8 mg PO[4]{3-}/g respectively. Results have shown that the raw natura l materials (chalk, clay, dolomite and tripoli powder) and wastewater electric coagulation treatment sludge are of low efficiency. Results for experiments with synthetic solutions of phosphates are in correlation with results for actual wastewaters. Thu, 01 Jan 2015 00:00:00 GMT https://elib.belstu.by/handle/123456789/20950 2015-01-01T00:00:00Z