It is proposed to conduct the conditioning of the molten glass in the feeder channel of the glass-making furnace on the surface of molten copper. It is shown that this will make it possible to reduce the thickness of the molten glass layer, increase its thermal homogeneity, reduce fluctuations in the level of molten glass and improve the quality of the products. Issues of interaction of molten copper with glass mass and atmosphere of feeder channels are considered.
Processes of changes in the state of polished surfaces of optical silicate glass BK10 are considered, the influence of the environment on them is determined. It was found that the treatment of polished surfaces of optical parts made of this glass in hexamethyldisilazane vapor leads to the creation of a protective hydrophobic film that prevents them from being exposed to high humidity.
The results of a study of the processes occurring during heating and isothermal holding at 450 ° C with passing an electric current through a sample of lead-silicate glass S78-4, widely used in electronic engineering, are presented. The dependences of the change in electrical conductivity on temperature and on the time of annealing were obtained for a continuous unidirectional current through the sample, as well as for an alternating current excluding electrical mass transfer. The results obtained can be used to improve existing and create new technological processes for the production of electronic products using lead-silicate glasses.
A new technology of laser blunting of sharp edges of glass and other brittle non-metallic materials by forming a chamfer due to the removal of a sharp edge of the material under the influence of thermal stresses is described. A physical model of the process of laser heating of the edge of a material opaque for laser radiation is proposed. The relationship has been established between the main parameters of the process: the dimensions of the chamfer, the speed of chamfering, the power of laser radiation and the strength of the edge of the glass. Optimization of technological modes has been carried out, a technological process and laser equipment for cutting and chamfering from glass have been developed. The advantages of the new technology of laser chamfering from glass are shown in comparison with the traditional technology of chamfering using a diamond abrasive tool.
Glasses of silicate, borosilicate, aluminosilicate and aluminoborosilicate systems are considered. Expressions have been obtained for determining the activation energy of hydrogen permeability, the hydrogen permeability coefficient depending on the content of all, without exception, the components included in the studied glasses, comparing glasses of different compositions in terms of permeability and permeability; glass when heated. The limits of changes in these criteria are determined. It is proved that silicate glasses impermeable to hydrogen do not exist
Informational data on the use of amorphous siliceous rocks for the production of foam glass, as well as the results of laboratory studies on the study of the dependence of the foaming temperature on the melting temperature of the original glass are presented. A composition of low-melting glass based on flask, soda ash and boron-containing raw materials (borax) was developed with an ingredient ratio of 1: 0.3: 0.35, respectively, as well as a method for producing block foam glass, and on its basis were obtained in laboratory conditions foam glass blocks
A mathematical model has been developed on fuzzy sets, which describes the dependence of residual stresses in sheet glass on the annealing mode. An adaptive control system for glass annealing is proposed using a model describing the dependence of residual stresses on the annealing mode. Simulation modeling shows the possibility of stabilization of residual stresses in the produced glass on the operating equipment due to the automation of the control of the technological process of annealing.
The necessary level of air heating was determined by calculation, which ensures the maximum permissible temperature of the combustion products of the bath furnace in the combustion zone. The inexpediency of regenerative heating of air to ultra-high temperatures is shown.
Possible modes of gas outflow into the molten glass layer through a horizontal tuyere, as well as the structure of the blowing zone formed in this case, are investigated on a physical model of a glass-making furnace with a bubbling layer. Initial data were obtained for the formation of unambiguous conditions in the mathematical model of mixing glass melt in a bath furnace.
A method for the nucleation of a crystal seed is proposed, which consists in the action of a stationary laser beam with an increasing pulse energy, which makes it possible to significantly reduce and stabilize the time of formation of microcrystals. A significant improvement in the homogeneity of crystal structures formed under the action of a focused beam of a femtosecond laser with an elliptical waist cross section in comparison with a conventional Gaussian beam has been demonstrated. It was found by confocal Raman spectroscopy that the obtained crystalline channels consist of LaBGeO5 crystals oriented along the scanning direction by the laser beam
