VOL 90, No. 11 (2017)

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.

Ceramic block supports were obtained by extrusion molding, varying the particle size and the conditions for obtaining corundum. The structural and mechanical properties of the molding mixtures were investigated, the textural and strength characteristics of the blocks after annealing were determined. It is shown that the use of corundum powder obtained by mixing particles of different sizes leads to the production of a molding mass of the 1st or 4th structural-mechanical type and makes it possible to prepare a ceramic block carrier with a channel density of about 200 pieces / inch ², mechanical strength of at least 4.3 MPa and high resistance to thermal cycles

The features of the action of cationic promoters on the thermochemical behavior of zirconium hydroxide have been investigated. It is shown that the composition and properties of the obtained materials are determined by the type, concentration of the promoter, and the temperature of formation of the oxide phase.

The results of an experimental study on the generation of X-ray radiation using a ceramic piezoelectric transformer installed in a vacuum are presented. X-rays were emitted by operating a piezoelectric transformer at a resonant frequency of about 20 kHz. In the measured X-ray spectra, a peak of the characteristic radiation of a titanium target with an energy of 4.5 keV is observed against the background of bremsstrahlung. The maximum energy of X-ray bremsstrahlung reaches 12 keV. This means that electrons are accelerated in vacuum in the field of a piezoelectric transformer to an energy of at least 12 keV

The features of the processes of mechanochemical interaction in the Ca (OH) ₂ -Al-H ₂ O system were investigated using the methods of X-ray phase, X-ray structural and synchronous thermal analysis. It is shown that the joint mechanical activation of the initial components in the ratio of Ca (OH) ₂: Al = 1: 2; 1: 4; 1:12 and further heat treatment at 1000 ° C leads to the formation of aluminates with the same molar ratio. Studies of the specific surface area and mechanical strength of the synthesized samples have established that calcium hexaaluminate has the highest performance.

The effect of the firing temperature and heating rate on the content of elemental iron in specimens based on montmorillonite clays of the Orenburg region has been investigated. It was established by X-ray fluorescence analysis that the iron content in the samples based on kaolinite-containing clay and a mixture of clays does not change in the temperature range under study. The possibility of using the content of elemental iron as marks for controlling the sintering stages of aluminosilicate ceramics is shown.

The influence of the mass content of Al ₂ O ₃ on the stability of the phase composition and the strength of the ceramics of the Al ₂ O ₃ -3Y system has been determined. -ZrO ₂ prepared according to industrial technology. It is shown that the introduction of aluminum oxide has a positive effect on the stability of the tetragonal phase of zirconium dioxide under conditions of accelerated aging. At the same time, an increase in the mass content of aluminum oxide from 15 to 80 & # 37; does not lead to a further significant change in the t-ZrO ₂ / m-ZrO ₂ ratio. It was found that after 5 hours aging, all materials containing alumina exhibit an increase in strength.

Comparative tests of a vertical centrifugal mill were carried out for grinding waste from the production of ceramic products: insulators and crushed mullite bricks. It is shown that the use of a vertical centrifugal mill in the process of grinding waste from the production of ceramic products makes it possible to increase the efficiency of their processing.