The results of electrical treatment of liquid glass in a special electrolyzer are presented, as a result of which the fluidity of liquid silicate increases more than 2 times practically without changing its concentration. This makes it possible to improve the quality of abrasive products containing electroactivated glass due to better mixing and to exclude an additional adhesive additive, dextrin, from the formulation. Tab. 2.
The influence of the method of introducing the catalyst on the nature of phase formation in glass-crystalline materials obtained by the method of ceramic technology from glass of spodumene composition, welded in a solar oven, has been studied. The main characteristics of sitalls are determined. It is shown that when a catalyst is introduced during glass synthesis, the optimal phase composition, which determines the properties of glass-crystalline materials, is formed at lower sintering temperatures. It has been established that ceramic technology can be used to obtain sitalls with good dielectric characteristics. Tab. 2, ill. 1, bibliography: 2 titles.
The low activity of the components in relation to each other and the large difference in thermal expansion coefficient in the preparation of cermet composites based on a clay matrix with a high content of a metal filler presented certain difficulties. The studies carried out made it possible to develop a technology for creating such materials, to determine the physicochemical processes on which the operational and physicomechanical properties of composites depend. Bibliography: 4 titles.
The research results characterizing the electrical explosion of conductors as a chemical reactor are presented. It is shown that with EEC in chemically active media, it is possible to obtain nanopowders of refractory nonmetallic materials in a nanodispersed state. The conditions are analyzed that allow one to regulate the phase, chemical and dispersed compositions of the formed powders: the energy introduced into the conductor, the arc stage, the chemical composition and the density of the environment. Tab. 3, ill. 3, bibliography: 11 titles.
Two thermostat options for the secondary measuring device have been developed and tested in the field. The temperature required for normal operation of the secondary device from 5 to 50 ° C is maintained throughout the entire time the thermostat is in the dryer - 43 hours. Fig. 2, bibliography: 6 titles.
Cause-and-effect relationships have been investigated when bricks are fired in tunnel kilns, and the reasons for rejects caused by the high-speed mode of heat treatment of products in the kiln have been determined. With existing gas burner devices, the requirements for high-speed firing modes cannot be met. It is necessary to modernize the furnace: replacement of Vulcan-Gas gas burners with burners of modern design with automatic control of the furnace thermal regime and improvement of the thermal regime in the preparatory zone of the tunnel furnace. Il. 4, bibliography: 4 titles.
A technology has been developed for the manufacture of bushings from sintered washer-blanks obtained by slip casting under pressure from steatite sitall K-14. The technology of making watch stones on semi-automatic machines was adopted as a basis. The influence of laser radiation parameters on the process of piercing holes in blank washers to obtain bushings is investigated. Comparative properties of bushings are given. Tab. 1, ill. 3, bibliography: 5 titles.
The influence of the silicate module of liquid glass, functional additives and mechanical activation of the filler on the composition of the fire retardant composition is shown. At temperatures up to 700 ° C, a decrease in thermal diffusivity is achieved by the formation of a heat-insulating layer foamed with vapors of water dehydrated from liquid glass. In the high-temperature region, the nepheline synthesis improves the heat-insulating properties when sodium silicate interacts with alumina. Mechanical activation of alumina enhances the effect. The addition of urea and boric acid to the composition of additives improves the fire-retardant properties of the gas environment. Tab. 2, ill. 4, bibliography: 8 titles.
The behavior of a material layer in a rotary kiln is considered from the perspective of continuum mechanics. The change in the bulk density of the material layer is considered depending on the temperature in the zones of the furnace. It was revealed that under the influence of physical and chemical elementary processes occurring in the granules of mineral raw materials, surface forces arise in the material layer, which significantly affect the speed of the translational motion of the granules along the length of the furnace. It was found that the material layer of the fired granules along the length of the furnace moves in a wave-like manner (Riemann waves). Various geometrical profiles of rotary kilns are evaluated. Il. 2, bibliography: 1 title.
