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A selective quality control of the produced multilayer windshields during their bending was carried out. Deviations of the magnitude of surface tensile stresses in the edge of the glass from the requirements of technical conditions are revealed. Adaptive models are compiled that describe the dependence of the tensile stress in the edge of the glass on the temperature regime of bending. An algorithm for controlling the temperature regime of bending has been developed. Simulation modeling has shown the possibility of stabilizing the magnitude of surface tensile stresses in manufactured products.
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Hits: 12931
In the bulk of zinc phosphate glasses containing silver, a focused femtosecond laser beam forms luminescent and birefringent microregions. The possibility of controlling the optical characteristics of microregions by varying the repetition rate and the number of laser pulses is shown. The results obtained are of interest for the development of a theoretical model of the processes occurring during the formation of nanoclusters and silver nanoparticles in oxide glasses, and the creation of multilevel optical memory on zinc phosphate glass.
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Hits: 13150
Differential scanning calorimetry was used to study the effect of calcium, barium and strontium oxides on the thermal properties of sodium borosilicate glasses. The thermal study data are compared with the results of structural studies of these glasses, and the factors determining the observed change in the glass transition temperature and specific heat capacity are established. The results obtained provide the possibility of adjusting the parameters of synthesis and heat treatment of matrix glass-containing borosilicate materials used in the immobilization of radioactive waste.
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Hits: 13454
Various methods of forming glassware, their physicochemical and technological features are considered. At the same time, the structural and deformation characteristics of glass-forming melts, the performance characteristics of glasses, and conditions for forming under isothermal and non-isothermal conditions are noted. An extended classification of molding processes is presented.
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Hits: 13834
The formation by a femtosecond laser beam of microregions in alkali-silicate glasses with different concentrations of Na
2 O, which exhibit birefringence associated with the formation of nanolattices, is demonstrated. The dependences of the phase shift of the formed regions on the number and energy of laser pulses have been established. An increase in the Na
2 O concentration leads to an increase in the minimum number of pulses required for the occurrence of birefringence, but at the same time, when exposed to 107 pulses for glasses of all compositions, the phase shift reaches approximately the same maximum value, which indicates the leading role of diffusion of alkaline ions in the formation of nanolattices in such glasses
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Hits: 14039
The main methods for obtaining gradient optical elements are presented, among which ion-exchange diffusion occupies the dominant place. A new method for obtaining gradient optical media, based on the discovery of anion-halide transfer in solid glasses, is noted. Methods for measuring the profiles of the refractive index distribution implemented in practice are considered as an issue that occupies a special place in the technology of gradient optical elements and is one of the independent scientific problems. It is shown that in a number of cases, due to the size effect, it is advisable to correct the modes of ion-exchange processing empirically.
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Hits: 14014
It has been shown that it is possible to form nanoclusters and gold nanoparticles in potassium aluminum phosphate glass during heat treatment in the temperature range below T
g , which have luminescent and plasmonic properties depending on the size.
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Hits: 14272
A review of the literature data on sulfate-containing glasses in silicate, borate, and phosphate systems is presented. Experimental data confirm the finding of the [SO
4 ]
2- group in an isolated state in all systems, however, the possible amount of SO
3 contained in the glass is increases significantly when passing from silicate to borate and phosphate systems
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Hits: 14526
The process of vacuum melting of quartz glass with stage-by-stage filling of the crucible with layers of quartz grains is described. The results obtained in the experiment indicate a decrease in defectiveness and an increase in light transmission in quartz glass obtained as a result of layer-by-layer fusion
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Hits: 14780
The results of the successful application of the method of laser controlled thermal cleavage (LUT) for precision cutting of glass, ceramics and other brittle non-metallic materials are presented. Other varieties of the LUT method are considered: laser chamfering, laser parallel thermal splitting, drawing optical grids and strokes.
