Using a numerical model, the influence of the height and location of the overflow threshold on the hydrodynamics of the melt and heat transfer in the melting basin of a glass-making furnace is investigated. The differentiated effect of the overflow threshold on the formation of convection flows and heat and mass transfer in different parts of the brewing basin has been established. It is shown that the studied parameters of the threshold have practically no effect on the intensity of the bulk convection cycle of the melt. At the same time, they significantly affect the hydrodynamics of the melt beyond the threshold. The quantitative relationships between the design parameters of the threshold and individual characteristics of heat and mass transfer in the furnace basin are revealed. Tab. 2, ill. 6, bibliography: 9 titles.
To calculate the compositions of glasses with predicted hydrogen permeability, it is necessary to apply criteria that determine the structure of a substance, such as a silicate modulus, a connectivity factor, and a structure filling factor, as well as a glass comparison factor for a connectivity factor. A graphical method for optimizing the numerical values ??of these criteria has been developed. The compositions of glasses that are promising for the manufacture of hydrogen microballoons are presented. Tab. 2, ill. 1, bibliography: 22 titles.
A comprehensive analysis of the equilibrium of iron on industrial glass-melting float systems of different productivity has been carried out. A close relationship has been shown between the concentration of iron in glass, its melting temperature and homogeneity. The reasons for the deterioration of the homogeneity of the glass melt in continuous production are analyzed, and practical recommendations are given. Tab. 8, bibliography: 9 titles.
The structure and features of crystallization of glasses, which are a precursor of a pyroelectric material with a unique combination of properties, the composition 25La 2 O 3 x; 25B 2 O 3 & times; 50GeO 2 depending on the amount of Al 2 O 3 addition. It was found that as the alumina content increases, the character of glass crystallization changes significantly: the tendency of glass to oriented surface crystallization of the ferroelectric LaBGeO 5 is suppressed and the proportion of borate and lanthanum germanate increases. The character of glass crystallization correlates with IR spectroscopy data, according to which changes in the glass structure associated with an increase in the Al 2 O 3 content lead to a significant change in the BO 3 < / sub>: BO 4 . Tab. 1, ill. 6, bibliography: 15 titles.
The significant role of surface phenomena in technological processes, including glass production, is noted. Different glass technologies have specific features, respectively, they have features and surface phenomena. At the same time, this area has been insufficiently studied and requires more attention. Information on the role of surface phenomena in the technological processes of glass production and during the operation of glass products is presented. The possibilities of using surface phenomena in traditional and new technological processes are considered. Il. 2, bibliography: 36 titles.
The refractive indices and thickness of double-sided sol-gel coatings of different compositions, applied by dipping onto float glass sheets, have been measured. It was found that the refractive index on the upper side of the sample, which was in contact with the protective atmosphere of the melt pool during the production of glass, is greater, and the film thickness is less than on the lower one. This is due to the difference in the properties of the opposite sides of thermally polished glass and is associated with a different concentration of tin in the surface layers. Tab. 1, bibliography: 9 titles.
A technique has been developed for determining the chemical composition of medical glass by arc-excited atomic emission spectroscopy. Sample preparation for measurements does not require the use of acids and alkalis and consists in rubbing the glass sample and subsequent dilution with an appropriate buffer solution. Metrological indicators of measurements allow analysis in a regulated range of concentrations of the main elements of glass in accordance with GOST 19808-86. Tab. 3, bibliography: 4 titles.
Lump formation in a double-alkali glass batch for insulating glass during storage in the cold has been investigated. Technological modes of two-stage preliminary mixing of sand with water and alkali-containing components in the preparation of the charge are proposed. The effect of water temperature and pre-mixing modes on charge lump formation has been studied. Technological recommendations are given for optimizing the mode of preliminary two-stage mixing of the charge. Tab. 1, ill. 1, bibliography: 3 titles.
M?ssbauer spectroscopy revealed the presence of titanomagnetites and magnesian olivine in technological samples of basalt fiber production. These impurities can cause degradation of the fiberglass in the duplex process. Tab. 2, ill. 2, bibliography: 2 titles.
The strength characteristics of sheet building glass as a structural material intended for the perception of mechanical loads have been studied. Some research results and a clear picture of the first moments of fracture under loading of large glass sheets are presented. Il. eight.
