The technology of high-temperature ceramic welding has been developed, intended for repairing the lining of glass-melting furnaces without stopping and cooling them. This repair method allows you to restore damaged refractory products and, if necessary, change their characteristics in the direction of increasing refractoriness, resistance to aggressive media, and mechanical stress. The main and auxiliary equipment for ceramic welding was developed, repair masses were obtained for the restoration of various types of refractories. Tab. 1, ill. 2.
Sheet glass from different manufacturers or from the same production, but at different periods of their production, differ in color shade and total light transmission, which depends not only on the total content of iron oxide in raw materials and glass, but also on the displacement of the Fe (II) x; Fe (III). To ensure the high quality of glass melt, the technological process of melting and molding, it is necessary to stabilize the equilibrium state of various forms of iron.
Specific recommendations for equilibrium stabilization and process control are given. Tab. 2, bibliography: 18 titles.
The possibility of producing heat-insulating glass-composite material based on slag waste from thermal power plants (foam slag glass) is considered. A series of foam slag glass compositions has been developed. The obtained samples were tested: determination of water absorption, specific gravity, apparent porosity, density, compressive strength. In the study of the strength properties of foam slag glass, the methods of optimal planning of the experiment were used. Tab. 2, ill. 3, bibliography: 4 titles.
The formation of the equilibrium Cr (III) & hArr; Cr (VI) in colored optical glasses under the combined action of the acid-base properties of the matrix, the total concentration of chromium and the amount of other elements of variable valence located in the redox series to the right of chromium, and the relationship of this equilibrium with the change in the spectral characteristics of the glass is shown. Tab. 5, ill. 3, bibliography: 7 titles.
A method for preliminary briquetting of a foam glass charge using water as a technological binder is considered. The operating parameters of the preparation of the foam glass mixture have been determined. It has been established that hydration and hydrolysis of glass contribute to the improvement of the conditions for swelling of foam glass and an increase in its physical and technical parameters. Il. 3, bibliography: 4 titles.
Glasses of composition (in moles) 2Bi 2 O 3 , 3GeO 2 were obtained. Glasses have different colors and differ in electrical properties. This is due to the different concentration of bismuth ions with an oxidation state other than +3. The characteristic temperatures of these glasses were determined, based on which the modes of heat treatment were selected in order to obtain transparent glass ceramics. The influence of glass melting modes on the glass crystallization process has been established. Some physicochemical properties of the obtained glass ceramics have been investigated. Tab. 3, ill. 6, bibliography: 9 titles.
The article presents the results of studies of the thermal stability of heat-absorbing float glass with a thickness of 4.0 - 12.0 mm. It is shown that heat-absorbing glass has high thermal stability (more than 100 ° C). Based on the nature of the distribution of heat resistance along the width of the strip, it was concluded that the heat resistance of float glass depends on such technological processes as molding and annealing. Tab. 1, ill. 4, bibliography: 6 titles.
The main types of cutting of sheet glass are considered. Mechanical roller cutting is described in most detail as the most common at the moment. Explains the effect of roller geometry and loading on edge quality. It also provides a general description of waterjet and laser cutting technologies. The advantages and disadvantages of existing technologies are indicated. Il. 6, bibliography: 11 titles.
The mechanism of microliquation in glasses of the R 2 O - RO - TiO 2 - P 2 O 5 - R 2 O 3 - SiO 2 . In these glasses, after heat treatment, drop segregation leads to volumetric fine-dispersed sitallization of the crystalline component of the liquidating glass. The formation of secondary spherical inhomogeneities about 1 nm in size within the droplet-like formations intensifies the crystallization of glass after heat treatment. Il. 4, bibliography: 9 titles.
The features of the influence of the composition and structure of glasses in the Na 2 O - CaO - B 2 O 3 - SiO 2 and Na 2 O - CaO - B 2 O 3 - Al 2 O 3 - SiO 2 on the temperature dependence of viscosity in the range of 10 10 - 10 4 Pa · s. A significant influence of the processes of phase separation - liquation and crystallization - on the viscosity indices in the temperature range of the transition from the plastic state to the liquid state is shown. Tab. 1, ill. 4, bibliography: 2 titles.
