The article shows the results of research on brazing the beryllium window in a copper frame by the silver 72Ag–28Cu Cusil hard brazing alloy and study of the structure and vacuum density of the brazing joint. Manufacturing techniques and preparations of products for the brazing were developed, brazing modes on the flat simulator and the bent beryllium window were chosen. A batch of bent brazing beryllium windows which successfully passed tests for vacuum density after heating to 650°C during 0,5 h was made. The structure of brazing joints of beryllium with copper was analyzed. In microstructure of brazing the zone of fusing of beryllium and brazing alloy with partial dissolution of beryllium in brazing alloy is registered as well as Cusil brazing zone with copper dissolution. In zone of fusing of beryllium with Cusil two transitional layers in the form of intermetallic phases are observed. In the zone of Cusil brazing alloy there is the presence of Ag–Cu alloy with different concentra

In the article the main results of research of high-temperature materials developed by FSUE «VIAM» produced from the metal fibers intended for application as essentially new abraded seals of air-gas channel and sound-absorbing materials of gas turbine engines are presented. The work is executed within the implementation of the complex scientific directions: 9.7. «High-temperature deformable alloys and the composite materials strengthened by high-melting metal fibers and particles, abraded sealing materials» and 15.7. «Porous fiber metal materials for sound-proof designs» («The strategic directions of materials and technologies of their processing development for the period till 2030»)

In modern technology, including aircraft manufacturing, the composite materials with higher static and dynamic strength, fracture toughness compared to traditional homogeneous materials are increasingly used. Among the composite materials the laminated composite materials containing alternating layers of metal and intermetallic or ceramic are of great interest. Four methods such as thermal explosion, reactive sintering, reactive pressing and explosive welding+sintering were considered for obtaining the Ti–TiAl3 metallic-intermetallic laminate composite. The microstructure and phase composition of the samples were studied by the X-ray diffraction, local X-ray spectrum and optical microscopy methods. The study shows that the multilayered composite could be obtained by all four methods

In present article the thermo-resistant materials based on polyheteroarilens different types are described. The thermophysical (thermal conductivity, heat capacity) properties, thermal stability (TGA method, with increases temperature 5°С/min), the value of coke residue and strength properties (compression strength) after pyrolysis of polymer materials in coal at 1000°С during 1 hour, heat shield properties on temperature on the back side of sample (20 mm) and velocity of radiation heating as far as 800–1000°С and also erosion ablation properties are determined. It is shown, that material, based on different types of polyheteroarilens have improved operational properties versus material based on phenolic resins. Such material can be used as thermal protections materials. The work is executed within the implementation of the complex scientific direction 16.1. «Polymeric and foam materials» («The strategic directions of development of materials and technologies of their processing for

This article describes preparation of polycyanurate binder, processed by the method of resin transfer molding (RTM). By the methods of HPLC, IR spectroscopy and DSC analysis the reaction of cyclotrimerization cyanate ester resin in the temperature range of 130 to 150°C is studied. The optimum mode of heat treatment is found for cyanate ester oligomer allowed to implement almost 100% conversion of the functional groups to obtain heat-resistant polymer matrix with Tg≥250°C on the basis of the received results. Fiberglass and carbon plastics based on the binder have a high level of strength properties, both at room and at elevated temperatures. The work is executed within the implementation of the complex scientific direction 13.1. «Binding for polymer and composite materials of constructional and special purpose» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

Antifriction organoplastics reinforced with fabrics with polytetrafluoroethylene (PTFE) fibers or ultrahigh molecular weight polyethylene (UHMWPE) fibers are investigated. It is shown that friction coefficients in pairs «organoplastic–steel» and «organoplastic–carbon-filled plastic» change in the range of 0,07 to 0,20 depending on load and sliding speed (0,8–3,2 MPa; 0,1–0,45 m/s) with extremely low weight wear. Organoplastics are recommended as antifriction coatings for heavy-loaded sliding bearings in condition of dry friction. The work is executed within the implementation of the complex scientific direction 13. «Polymer composite materials» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

Layered hybrid metal-plastic composite materials are considered in the article from the point of view of optimisation of their composition for various conditions of functioning. Positioning and thickness influence of high-rigid layers on cylindrical rigidity of the composite is shown at a symmetric and asymmetric (unilateral) bend. Recommendations for choice of hybrid composites for various kinds of loads are given. The work is executed within the implementation of the complex scientific direction 6. «Layered metal-plastic, bimetallic and hybrid materials» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

The possibility of spectrophotometric determination of palladium content (from 0,2 to 2,5 wt. %) in platinum-palladium coatings using thiopyrine reagent is studied. Thiopyrine forms complex compounds with a characteristic absorption band intensely stained (=4,1•104) at maх=335 nm in acid solution with Pd (II) ion. It is established by isomolar series methods that thiopyrine and palladium in 0,1 N H2SO4 medium are included in the complex forming coloration with 1:3 ratio. In order to analyze the platinum-palladium coating was separated from the copper substrate on which it was deposited by dissolving the latter in HNO3 solution (1:1), while the platinum palladium coating remained undissolved. After washing and weighing the coating was dissolved in a mixture of HCl and HNO3 acids (acid ratio of 3:1) under heating. After sample preparation, the optical density of the solution at a wavelength =335 nm with a spectrophotometer PE-5400 was determined. An appropriate concentration of reage

The method of research of creep at step loading is offered and the device of automatic registration of deformation is developed. This method consists in uniaxial step stretching of polymer sample in isothermal conditions at temperature of 100°C when mobility of supermolecular structures of polymer is facilitated. As a result the dependence of relative deformation on time is having the step appearance . The constant deformation, i.e. equilibrium deformation of certain structural elements remains on each step of this curve. The curve consists of three sites: on the first the Hooke law is carried out; the second is responsible for step creep; on the third is developed the general plastic strain and sample passes to neck. Sample reduction to the initial sizes is also revealed at loading reduction after step loading. It is supposed that driving force of process of retardation are relaxation processes. The method of step loading is peculiar «mechanical spectroscopy» of supermolecular structu

Different existing test methods on corrosion aggression of aviation gasolines are given in the work. The conditions influencing corrosion aggression of gasolines are analyzed. Complex test methods executed at FSUE «VIAM» on metal materials of the aircraft engine, including different influencing factors, such as elevated temperature and humidity are considered. Results on comprehensive tests are given in this work on determination of corrosion aggression and acidity of Avgas 100LL gasoline. On the basis of the developed technique the internal FSUE «VIAM» STO 1-595-7-503–2015 standard «Method of determination of corrosion aggression of gasoline» was published. The work is executed within the implementation of the complex scientific direction 2.2. «Qualification and researches of materials» («The strategic directions of development of materials and technologies of their processing for the period till 2030»)

The research results and curves built on the developed mathematical algorithm of probability detection of defects by their size and also the comparative analysis of testing results reliability by using the ultrasonic phased arrays and single element piezoelectric convertor are shown. It is shown that probability of defect detection for ultrasonic testing of the monolithic CFRP structures by phased array technique is considerably higher than by using traditional piezoelectric transducers.

Research results of operation capabilities of ultrasonic resonance method during multilayer constructions control are given. It is shown that the resonance method can be used for detection of glued joints defects and stratifications in constructions from metal and non-metallic materials. Recommendations about application of contact environment on water basis for acoustic contact between piezoelectric invertor of the defectoscope and controlled product are made.