The results of investigation of the influence of the assembly gap width on the microstructure of brazing joints of pseudo-α-alloy VT20 with VPr16 solder are presented. The soldered samples after brazing and subsequent homogenization heat treatment (HHT) are analyzed. The main types of microstructures formed in the solder joint are identified and regression equations of the influence of the gap width and duration of the HHT on the main transition points of the solder joint microstructure are constructed. The dynamics of change of alloying elements (aluminum, zirconium, copper and nickel) in the solder joint and diffusion zone has been studied. The optimum microstructure is selected, which does not have a boundary in the center of the seam and boundaries of the junction of crystals.

The climatic aging of aramid organic plastics in various natural environments is investigated. It is shown that the climatic stability of organic plastics is at the level of resistance of polymeric composite materials reinforced by carbon fibers and fiber glasses, despite the higher water absorption. Organic plastic Organit 10Т has 71 % of tensile strength properties after 18 years of climatic aging. Organic plastics can recover their properties after removal (drying) of the sorbed moisture. Organic plastics from new Rusar-NT fiber and epoxy melt binders have the biggest resistance to climatic aging.

General information is provided on the most commonly used and promising erosion-resistant and corrosion-resistant ion-plasma coatings for the protection of gas turbine engine parts. A brief analysis of the main methods of applying protective coatings to parts of the gas turbine engine compressor is carried out. The strengths and weaknesses of the coatings used are shown, as well as some properties such as erosion and corrosion resistance and operating temperature. The main development trends in the field of erosion-corrosion-resistant ion-plasma coatings are considered. The issues of the peculiarities of applying protective coatings to large-sized parts of the gas turbine engine compressor are discussed.

Acoustic conical mirror for high sensitivity ultrasonic inspection of titanium alloy complex shape forging was offered and developed. Its geometrical parameters were calculated using mathematical modelling. The correction coefficients which are needed for compensation of the curved input surface influence were calculated. The high accuracy of the calculation was confirmed. The use of an acoustic mirror allowed increasing the sensitivity of inspection by more than 12 dB (4 times).

The possibilities of using direct pole figures (DPF) are analyzed for researching structural formation processes during heating of cold worked metals and also at hot deformation. It is shown that acceleration and automation of DPF plotting allows to significantly increase the efficiency and reduce the duration of research. It is shown that the application of DPF is productive not only for studying the process of transition of metallic materials to deformation texture but also inverse processes. This method is tested for aviation metal alloys.

The research presents the results of experimental determination of friction coefficient and linear wear at rubbing of graphite and boron nitride in the friction pair with materials of different types (steel 95X18, bronze BrAZh9-4, fluoroplastic F-4, polyamide PA-6, graphite MPG-7and hard alloy VK-8) under conditions of low speeds. It was found that the friction of polymers in pairing with layered solid lubricants is determined by tribotechnical properties of the polymer. The friction coefficient of layered solid-lubricating materials paired with metallic materials is determined by the quality of the forming adhesive ordered lubricating layer on the metal surface.

A step-by-step analysis of the ultraviolet spectrum was carried out. It is shown that UV-B and UV-C light are present on the Earth's surface in small doses. UV-A light on the Earth's surface has significant doses leading to photolysis and destruction of heteroorganic polymers. In order to conduct research by simulating light aging, it is necessary to simulate solar radiation in the range from 290 nm (UV-B) with a set of LED radiation sources that fully correspond to the spectral composition and power of Sunlight on the Earth's surface.

The paper presents a comparative study of methods for determining the mass fraction of hexamine in samples of the «catalyst FU» using manual and instrumental approaches. The work describes the principles and stages of each method and analyzes their advantages and disadvantages. Statistics of the results of determining the composition of the product by three methods are presented. Based on the results obtained, a method for determining the mass fraction of urotropin has been proposed, which makes it possible to increase the accuracy and efficiency of the analysis.

Magnetic hard materials (Pr_1–xDy_x)_13,12–13,3(Fe_1–yCo_y)_{76,29–78,98}B_7,86–10,5 (x=0,40–0,58, y=0,20–0,24) for navigation devices are investigated depending on the composition and temperature of sintering. Measurements were carried out on a vibrating magnetometer on spherical samples at a temperature of 20±5 °C in magnetic fields up to 1800 kA/m. The demagnetization curves of sintered materials were measured by magnetization and induction with different cobalt and dysprosium contents. Special attention is paid to the rectangularity of the demagnetization curve depending on the composition and temperature of sintering.