On the basis of the author's methodology and structural model of monodisperse systems in combination with the theory of percolation, the parameters of the porous structure of the reaction-bound silicon nitride are estimated depending on the content of the pore-forming agent. When evaluating the thermal conductivity of ceramics, it was found that the analytical and experimental results for silicon nitride without a pore former are in satisfactory agreement with each other, and for samples with a pore former & # 8211; are several times different. A hypothesis has been put forward that a sharp decrease in thermal conductivity during the introduction of a pore-forming agent is caused by the effect of separation of silicon particles by larger particles of a pore-forming agent.
A comparative analysis of the physical and technical properties of existing and proposed perlite thermal insulation products, agricultural components, acoustic fillings, demonstrating a significant improvement in the quality of the latter. In this regard, a selective method for the development of perlite deposits with thin extraction layers is proposed to obtain a homogeneous perlite rock in terms of average density, followed by classification by the size of fractions, which will make it possible to obtain a homogeneous raw material and expanded perlite with a stable set of properties.
Based on the natural zeolite of Nakhchivan, clinoptilolite zeolite was synthesized and the effects of synthesis conditions (temperature, concentration of thermal solution and mineralizer) on the crystallization process were investigated. The zeolite tuff of the Nakhchivan Kukuchay deposit was used as a starting material. It was found that the optimal synthesis conditions favor the production of clinoptilolite with a 100 ° degree of crystallinity. Changing the optimal synthesis conditions contributes to the production of other structural types of zeolites or their associations.
A laboratory technique has been developed for obtaining an ultra-low-background hybrid material based on organic glass - polymethyl methacrylate (PMMA). 157 Gd nuclei are used as an effective absorber of thermal neutrons in the hybrid material. The uniform distribution of gadolinium in the PMMA matrix is ??achieved by its introduction into the hybrid material in the form of a coordination compound - gadolinium acetylacetonate. A uniform distribution of gadolinium was achieved in a 5 cm thick matrix of hybrid material with a mass content of gadolinium from 1.0 to 1.5 & # 37 ;. It is shown that at a temperature of 298 K, the mechanical characteristics of the samples of the hybrid material and nominally pure PMMA coincide, and at a temperature of 77 K, the hybrid material is inferior to pure PMMA within the acceptable requirements.
the results of studies on reducing the melting temperature of strontium aluminosilicate glass by introducing boron and phosphorus oxides into the charge are presented, the main physicochemical processes occurring in the charge during heating, the sequence and temperature ranges of their course are determined
A ponderomotive method for obtaining information on the magnetic susceptibility of iron-containing particles in various media, including glass and ceramic industries, is considered. A corresponding magnetometer with spherical pole pieces is characterized, which makes it possible to create and identify the required (for placement of the studied samples) zone of stability of the induction gradient & mdash; in the vicinity of the extremum of the coordinate dependence of the gradient characteristic of such poles. Examples of identification of coordinates and sizes of such zones, in particular with a deviation of up to 3 & # 37; from the average value of the gradient
Pilot winding of three batches of fiberglass rods was carried out on the production line. The optimal composition of the EDI binder was selected with the ratio of the components ED-22 / IMTGFA / UP-606/2 in mass parts: 100/85 / (1.5 - 3), which provides an increase in the glass transition temperature of products by 10 - 15 & # 176; С compared to control samples. The increase in the glass transition temperature was confirmed by TMA and DSC methods in all three pilot batches, manufactured at different times. Temperature conditions for processing a new composition of EDI in an impregnating bath 35 and 40 & # 176; C are proposed to increase the viscosity, which ensures the mass content of the binder in fiberglass 15 & # 37; that meets the requirements of regulatory documents
The method of image analysis revealed how non-equilibrium solidification conditions (contact with air, with a mold, without contact) affect the macrostructural parameters of glass-crystalline spinel-pyroxene materials. It was revealed that nonequilibrium conditions determine the zoning of the structure. A mechanism has been formulated that determines the microzoning of the structure, which consists in the fact that in the process of crystallization a critical size of spinel arises, upon reaching which it acquires its own & # 171; zone of influence & # 187; - a certain volume of the melt, proportional to its size, which forms a shell around the spinel due to epitaxial growth
The lack of production facilities in Uzbekistan for the enrichment of quartz raw materials creates difficulties in improving the quality of products and their competitiveness. The aim of the study was to identify the possibility of enriching quartz raw materials by physical methods. In laboratory conditions, the methods of sieving, washing, classifying, scrubbing, and magnetic influence have been used. The most promising quartz sands for the glass industry from the point of view of beneficiation, as well as the possibility of beneficiation of vein quartz and quartzite, have been determined.
The study of the stress state of the glass coating of a pipe in the petrochemical industry is presented. Formulas are obtained for determining the longitudinal, radial and tangential stresses arising in the sections of the pipe coating. An experimental study of the stress state of the glass coating of the pipe has been carried out. The tensile strength of the glass coating of the pipe under high temperature conditions is presented.
