VOL 91, No. 2 (2018)

A scientifically substantiated applied technique for indirect assessment of the actual intensity of convective heat removal during jet cooling of corrosive zones of the melting basin of glass-making furnaces is presented, which makes it possible to determine the actual heat transfer coefficients in critical zones based on the results of direct measurements carried out within the framework of current monitoring of the state of refractory structures of the melting basin of glass-making furnaces. An algorithm for practical implementation is developed and a real example of using the proposed methodology is given.

A method of manufacturing ceramic cores from ytterbium oxide enriched in ytterbium-168 isotope is presented. This method is based on sintering ytterbium oxide powder under a high isostatic pressure of about 8 GPa in order to obtain its B-modification with a monoclinic crystal lattice structure. The equipment used, the sintering modes and the results of the analysis of the obtained samples are described, which, due to their high density (up to 10.2 g / cm ³), are promising for use as sources in contact radiation therapy of tumors

The composition of the charge for the production of facing ceramics based on low-plasticity clay has been developed. As additives, the mixture is introduced (mass content, & # 37;) 10 & # 37; titanium dioxide, 5 & # 37; boric acid and up to 5 & # 37; galvanic sludge. The influence of charge components on the composition and structure of the developed material, as well as the main operational properties of products obtained on the basis of the developed composition, has been investigated. The results confirm the possibility of synthesizing environmentally friendly ceramics obtained due to the vitrification (self-glazing) effect on the surface of products and on the surface of ceramic particles throughout its volume.

The rheological properties of highly concentrated suspensions consisting of nanocrystalline zirconium oxide powders of monoclinic, tetragonal and cubic modification (stabilized at a molar content of yttrium oxide 4 and 8 & # 37;) and liquid UV photocurable monomers of various nature have been investigated. Dynamic viscosity of suspensions with the highest filling by volume up to 32 & # 37; was 3 Pa & # 215; s at a shear rate of 10 s ^-1 and about 1 Pa & # 215; s at 100 s ^-1 at 20 & # 176; C

Within the framework of the quasi-static problem of thermoelasticity, the effect of pulsed laser radiation on a plate is considered. An analytical relationship is obtained, which is the condition for the thermal strength of the plate and allows one to determine the non-destructive modes of laser processing for the case when the diameter of the laser beam is less than the diameter of the processed plate. Experimental verification of the results obtained

Samples of models of power transmission line supports based on basalt and glass roving in the form of pipes with five different winding schemes: longitudinal-transverse, spiral-longitudinal, spiral-longitudinal-transverse and spiral with an angle of 30 and 60 & # 176; to the mandrel axis. Studies of elastic-strength properties during transverse bending tests were carried out and it was shown that the highest values ??of the elastic modulus are provided by the longitudinal-transverse winding scheme, the smallest - by spiral winding at an angle of 60 & # 176; to the axis. The modulus of elasticity of basalt plastic pipes is slightly lower than that of fiberglass pipes, which can be explained by the lower linear density and more uniform laying of the used glass roving.

A method for the synthesis of copper ferrite is proposed, which consists in the anion-exchange precipitation of copper (II) and iron (III) from solutions of their salts in the presence of tartrate ions as a complexing agent, followed by calcining the resulting precipitate. By the methods of chemical, complex thermal and X-ray phase analyzes, IR spectroscopy, scanning electron microscopy and micro X-ray spectral analysis, both precursors and products of their heat treatment have been studied; also studied the magnetic properties of the obtained samples. The presence of a ferrimagnetically ordered phase in the synthesized materials and the proximity of their magnetic properties to bulk CuFe ₂ O ₄

The dependences of the ultimate strength in compression of diatomite on temperature in the temperature range of 50 - 700 ° C are investigated. The ultimate strength in compression at a temperature of 450 - 500 & # 176; C exceeds the strength values ??under normal conditions by about 2 times. This makes it possible to streamline the process of heating diatomite-based lining of high-temperature aggregates.