The kinetics of diffusion saturation with carbon, the formation of the microstructure and hardness of diffusion layers in economically alloyed high-nitrogen structural steel with different nitrogen concentrations during vacuum carburizing were studied. It was established that an increase in the time of the technological process from 1 to 4 hours leads to an increase in the length of the diffusion layer by 60–90 %, and an increase in the nitrogen concentration in the solid solution from 0,13 to 0,22 wt. % leads to an intensification of the process of formation of excess phases and an increase in the zone with a stable austenitic structure.

The article presents a retrospective and possible prospects for the application of the heat-resistant aluminum alloy V-1213 of the Al–Cu–Mg alloying system. The general problems of weldability of this alloy are indicated. The causes of hot cracks in welded joints during various types of welding are analyzed, and approaches for their elimination are considered in detail. The weldability of heat-resistant aluminum alloy V-1213 with the use of filler wire Sv-1217 has been studied. The influence of the welding-thermal cycle on the structure and microhardness of the material has been evaluated.

The wide application of titanium alloy parts in the aviation industry and the need to ensure high quality of their manufacture have led to necessity of the developing of new standard samples for determining and controlling the hydrogen content in titanium alloys. In this work the processes of hydrogenation of titanium alloy samples of the VT14 type by etching in a hydrochloric acid solution in the presence of fluorine ions and by electrochemical etching were studied. The material of standard sample blankes of the enterprise with different hydrogen content was manufactured. The hydrogen content in titanium alloys was measured using the emission spectral analysis method with spark excitation of the spectrum.

In this article the results study of modification of the 2,2-bis(4-cyanatophenyl)propane by catalytic system in order to reduce the cure temperature are presented. The methods of synthesis and heat treatment are described. The influence of curing temperature and the concentration of tris(acetylacetonato)cobalt (III), as well as 4-nonylphenol, using as solvent, on the polymerization rate of 2,2-bis(4-cyanatophenyl)propane, degree of conversion and glass transition temperature of the cured polymer matrix is shown.

The electrophysical properties of microneedles α-Fe (Pr, Dy)(Fe, Co)B at direct current and in the mode of recording the Q-factor of the resonator in an ultrahigh frequency (10¹⁰ Hz) magnetic field directed perpendicular to the constant field are investigated. It is established that the specific resistance of microneedles at direct current is in the range (1,5–2,5)·10^‒6 Om·m. The magnetoresistance of R(H) microneedles and its magnetic hysteresis at direct current have been detected. The maximum value of the magnetoresistance is R = 1,18 %. The orientation dependence of the maximum dependence dP/dH(H) is revealed.

Ceramic materials based on cerium dioxide are used as solid electrolytes of solid oxide fuel cells at temperatures below 600 °C. Based on the analysis of the results of existing world studies, it is shown that the ionic conductivity of doped CeO₂ depends on the synthesis method, sintering temperature and time, type and concentration of alloying elements, grain size, grain boundaries and etc. Recommendations are proposed for obtaining doped cerium dioxide with an increased ionic conductivity value in the medium-temperature range for the production of solid electrolytes.

A method for determining impurity elements Cr, Cu, Fe, Mn, Ni, Sn and Si microadditives in titanium ortho-alloys using inductively coupled plasma atomic emission spectrometry is proposed. Analytical lines of elements free from significant spectral overlaps are selected. The limits of detection and determination of elements are assessed. The metrological characteristics of the technique are assessed using model solutions. The correctness of the developed methodology with the use of model solutions are assessed using certified reference materials.

Residual stresses assessment of samples with different structural conditions is carried out under various x-ray parameters. Modeling of residual stresses under four-point bending has been executed. It shows that the most significant factor influencing residual stresses measurement error is the interplanar distance measurement error. Negative influence texture factors on the accuracy of residual stresses determination are identified – x-ray line small intensity out of textural maximum and elasticity anisotropy in materials. The surface roughness up to R_a = 1,4 microns for aluminum alloys samples is not an influence factor.

The kinetics of curing binder in prepreg was studied by differential scanning calorimetry method. The most adequate scheme of the curing reaction was selected and the kinetic parameters of the curing reaction for each elementary stage of the process were determined. On the basis of experimental data, generalized kinetic models of the curing reaction were constructed, and then the curing modes of the binder in the prepreg were selected were selected based on both experimental and calculated data, which were tested on technological equipment. As a result, the degree of material curing was determined.