The features of the formation and thermal stability of MnO x -CeO 2 nanodispersed systems have been investigated. The composition, structure, charge state and porosity of the obtained systems were investigated using the methods of XRD, XPS, HRTEM, RFLA, low-temperature nitrogen adsorption.
The advantages and disadvantages of heat-insulating materials offered in the construction market of the CIS are stated. It is noted that, in terms of the totality of characteristics, foam glass surpasses known insulation materials, having, however, a high cost due to the energy consumption of production, which makes it uncompetitive. A new promising direction is considered - low-temperature synthesis of glassy foamed heat-insulating materials based on waste products from phosphate ore processing industries. The developed technological process ensures the production of a foam material with high technical and operational properties and is characterized by the absence of energy-consuming stages. Foaming temperature is 250 - 300 & # 176; С
Using the method of kinetic colorimetry, the degree of polymerization and sizes of silicon-oxygen anions in solutions of water glass were studied depending on the silicate modulus, on the density (concentration) of silica, and also on the nature of the alkaline cation. With an increase in modulus above 2.6 and density above 1.3, the degree of polymerization increased markedly. Moreover, the modulus of liquid glass was the most significant factor in the range of characteristics studied. After exceeding the critical values ??of the silicate modulus and the concentration of soluble silicate, the system from a true polyelectrolyte solution, characterized by the presence of discrete polymer anions, goes to the state of a coherent-dispersed colloidal system with a high degree of bulk polymerization
The influence of the granulometric parameters of crystalline lead titanate on the thermal expansion coefficient of soldering glass compositions used for low-temperature vacuum-tight soldering of corundum products has been studied; the optimal values ??of the specific surfaces of the filler were determined
The study of the chemical and isotopic composition of glass fragments found on the territory of the former glass factory XVIII? XIX centuries. in Kazan. Are the finds divided into three main groups? by three types of glass from which they are made: Ca? K, Ca? K? Na, Ca? Na? K. The data of the chemical and isotopic composition show the difference in glass both in the formulation and in the raw material. Comparison of analytical and historical data made it possible to make the assumption that each group of glass corresponds to a certain production time. The composition of one of the groups indicates the possibility of introducing soda ash into the formulation
Presented are the results of the development of the composition of the charge and the selection of the firing temperature for the production of glass-ceramic material in order to obtain coordinated joints with molybdenum due to the close value of the TLEC. The use of broken sheet glass as a binder in an amount of 30% and firing at 1000 & # 176; С is substantiated.
The study of the effect of a number of additives on the rheological properties of clay has been carried out. The change in the limiting dynamic shear stress and plastic viscosity as a function of the concentration of complex additives is considered. The possibility of using technical lignosulfonate as one of the components of a complex thinning additive for clays is shown. It was found that the use of lignosulfonate in combination with sodium tripolyphosphate improves the casting characteristics of the ceramic mass.
A theoretical and experimental study of the influence of the parameters of the structure of ceramic compositions of the abrasive grain? a bunch? pores on the specific energy of their destruction. The experimental technique is described, a graphical interpretation of its results and their analytical processing in the form of mathematical models for calculating the destruction energy of compositions of various structural structures
The results of the development and modeling of large-sized products based on sheet thermoplastic composite materials with increased fire resistance, which are a three-layer sandwich structure, obtained from structural thermoplastics reinforced with discrete glass fibers. It is shown that high physical and mechanical characteristics of glass-filled composites based on aromatic polyesters make it possible to manufacture fire-resistant products for various fields of technology.
The possibility of using TsTS-19 ceramics in a pyroelectric X-ray source is being experimentally investigated. Measurements of X-ray radiation spectra showed the possibility of obtaining a potential on the ceramic surface up to 7 kV under vacuum conditions, which is an insignificant value in comparison with typical analogous values ??for pyroelectric crystals of lithium niobate and tantalate. This feature is due to the significant value of the dielectric constant of the used ceramics. It is shown that the main criterion for the selection of ceramics for a pyroelectric X-ray source can be the maximum value of the ratio of the pyroelectric coefficient to the dielectric constant
