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.
The effect of the electric field intensity and the percentage of multi-layer carbon nanotubes (MCNTs) on the strength of a composite consisting of unidirectional glass fibers has been studied. The results of tests of annular samples made by the winding method for different contents of MWCNTs in the composite and at different values ??of the electric field intensity are presented. Based on the test results, strength curves were constructed and a formula was obtained for the dependence of the strength of the composite on the intensity of the electric field and the percentage of MCNTs
A review of the literature on the production of fly ash at thermal power plants and the level of its processing in Russia and abroad is presented. The properties of fly ash and its fields of application are described. The use of fly ash in the production technology of refractory and heat-insulating ceramic materials as a source of aluminum and silicon oxides for the manufacture of refractory products based on mullite, cordierite or forsterite-spinel composition is considered in more detail.
The possibility of using wastes from the production of mineral wool (MB) and nepheline-syenite (NS) in the production of ceramics in order to improve the physical and mechanical properties of the samples, as well as their frost resistance has been investigated. The use of NS in the amount of 5 - 15 & # 37; increases the compressive strength of the samples to 17 & # 37; and reduces the density, water absorption and ultrasound speed in the samples to 5.2, 12.5 and 7 & # 37; after firing at a temperature of 1060 & # 176; C. An increase in the number of NS due to an increase in the number of pores, the diameter of which is 0.02 - 0.1 ?m in the samples, contributes to less destruction of the samples during the freeze-thaw process.
