Within the framework of a quasi-static uncoupled problem of thermoelasticity for an isotropic plate, non-destructive modes of high-temperature laser annealing of optical ceramics KO-1 and KO-5 with CO 2 laser radiation are determined. The treatment mode with a short exposure time leads to a significant increase in the required power density of laser radiation and a decrease in the required energy density. The treatment mode with a long exposure time leads to a decrease in the required power density of laser radiation, but causes a significant increase in the required energy density. An experimental verification of the adequacy of the computational model has been carried out.
A method has been developed for obtaining monophocones from quartz glass, based on its interaction with melts and fluoride solutions, in particular, with cadmium fluoride melt and with hydrofluoric acid solutions. The theoretical aspects of their production are considered, on the basis of which it is possible to implement various versions of the method for obtaining monophocones from quartz glass.
The influence of the type of silicon-containing raw material on silicate formation and crystallization properties of glasses of the lithium aluminum silicate system is considered and the expediency of using amorphous silica to increase the homogeneity of sitall glasses during melting in industrial conditions is substantiated.
An analytical review of the literature on the change in the processes of glass melting, the thermal transparency of the molten glass, the light transmission of glass, depending on the redox potential of the raw material and the charge, is given. Experimental data on the effect of oxidation-reduction potentials (ORP) of charges and glass breakage on the color of industrial glasses are presented. The conditions of transformation and equilibrium of iron oxides during glass melting are considered.
The results of a computational and experimental study of cooking three-module sodium silicate from a sulphate charge without the use of a reducing agent are presented. The above results indicate the great possibilities of organizing the cooking process of sodium silicate without using a reducing agent at temperatures of 1450 - 1500 ° C in thin films of the melt.
The effect of the dispersity of the glass batch on the main parameters of the foam glass has been investigated. It has been established that the choice of a certain combination of the grain-size composition of the feedstock and the temperature-time conditions of its foaming ensures the production of foam glass with the specified performance properties.
It is reported about an attempt at local modification of the optical properties in the bulk of macroporous glass plates with a porosity of 0.58 cm 3 / cm 3 and an average channel size of 50 - 70 nm under the action of laser radiation weakly absorbed by the material. ... As a radiation source, an ytterbium fiber laser with an emission wavelength? Lambda; = 1.07 µm, pulse duration & tau; and ~ 100 ns and their repetition rate & upsilon; = 10 - 100 kHz. The dependences of the temperature and power of radiation transmitted through the irradiated area on the duration of exposure are given.
The possibility of producing granulated foam glass based on the use of household and industrial cullet, low-melting ceramic filler and organic additives is considered. An environmentally friendly resource-saving technology for producing heat-insulating material - granular glass-ceramic foam - has been developed. In the study of the physical and technical characteristics of the granules, the methods of mathematical modeling of the experiment were used.
The main difficulties of accurate determination of the redox state of glass are noted. The specific effect of tin on the valence equilibrium of iron in the surface layers of float glass is shown. The technique of spectrophotometric determination of different valence forms of iron in industrial silicate glasses, which is applicable for flat and hollow products, is described. The technique is highly expressive and accessible.
The possibility and energy efficiency of using natural raw materials - high-silica sedimentary rock - as a raw material in the production of colored glass containers has been revealed. The presence of phosphorus oxide in the rock affects the viscosity and crystallization properties of the synthesized glasses. The level of physical and chemical properties of the obtained glasses corresponds to the level of the main operational properties of container glass based on traditional raw materials.
