The technology and installation for the economical production of glass-silica based on the modular principle of production creation have been developed. A mathematical model for calculating heat transfer is proposed, which makes it possible to determine the required thicknesses of thermal insulation for a bell-type heater and forms that ensure minimal heat loss to the surrounding atmosphere during continuous operation of the heater. Il. 5, bibliography: 2 titles.
A new technology has been developed for obtaining gold smalt using the preparation of "liquid" gold. In the alkaline-borosilicate system, glasses of various shades are synthesized, intended for use as a substrate in the manufacture of smalt. This made it possible to expand the range of gold smalt. Bibliography: 1 titles.
The selective effect of surfactants on the weakening of interatomic bonds along certain crystallographic planes in the surface layer of a ruby ??single crystal subjected to polishing was found. Tab. 1, ill. 1, bibliography: 1 titles.
The effect of ZnO crystallization on the current-voltage characteristics has been investigated. It was shown that the introduction of Bi 2 O 3 , TiO 2 , SnO 2 promotes crystal growth, while Sb 2 O 5 , CoO and MnO slow down their growth. The formation of a fine-crystalline structure with thin interlayers of the glass phase increases the current-voltage characteristics. Il. 2, bibliography: 12 titles.
The velocity of propagation of ultrasonic waves and absorption of ultrasound in beryllium ceramic samples of various densities, configurations, and sizes, differing in the molding method and degree of texturing of BeO microcrystals, have been investigated at room and low temperatures (about 100 K). It was found that with an increase in the density of the samples, the speed of propagation of ultrasound in them increases. It is shown that the speed of ultrasound in beryllium ceramics without specially introduced impurities weakly depends on the frequency in the range of 5 - 25 MHz. Tab. 5, ill. 1, bibliography: 13 titles.
The use of magnetic filter-separators with a granular (in particular, poly-ball) working matrix for purification of various suspensions, including ceramic ones, from ferro-impurities is proposed. The design of the cartridge type is considered, which makes it possible to quickly carry out frequent regenerations of the apparatus. On the basis of the physical model of "fractional" parallelepiped cells and the formal model of the port tubes of the granular medium, the principal parameter of the filling medium, the equivalent pore diameter, was estimated. Tab. 1, ill. 3, bibliography: 4 titles.
The effect of engobe on the moisture expansion of double-fired tiles is shown. An engobe with insignificant moisture expansion was obtained, which improves the operational properties of the tiles. Tab. 2, ill. 2, bibliography: 1 title.
The material for the production of cutting tools for a drop-forming machine has been investigated. Alumina and silicon carbide were selected as the main components. A new shape of the scissors has been developed. Tab. 1, bibliography: 2 titles.
The interaction of chrome-corundum and chromium oxide refractories of granular structure with melt for obtaining basalt fiber has been investigated. It was revealed that the chromium oxide refractory material does not interact with the melt. Production tests have confirmed the feasibility of using this material for the lining of basalt fiber melting furnaces. Tab. 1, ill. 1, bibliography: 6 titles.
The ceramic sphero-cones of the Bulgarian settlement (XIV century) have been investigated. Comparison of strength characteristics is carried out. The features of the mineral composition of the samples have been studied. Tab. 1, ill. 2, bibliography: 6 titles.
