Moscow oblast, Russia
Moscow oblast, Russia

Time filter

Source Type

Portnoi V.K.,Moscow State University | Leonov A.V.,Moscow State University | Streletskii A.N.,RAS Semenov Institute of Chemical Physics | Logachev A.V.,OAO Kompozit
Inorganic Materials | Year: 2013

Nanocrystalline mixed (substitutional/interstitial) solid solutions have been prepared by milling four-component mixtures with the overall compositions (Ni2.8AlCr0.2)C0.5 and (Ni3Al 0.8Cr0.2)C0.5. Analysis of X-ray diffraction data indicates that the formation of the solid solutions is accompanied by an increase in deformation stacking fault probability, which is directly related to the amount of dissolved carbon. Our results demonstrate that the heating-induced ordering of the solid solutions occurs in several steps. Nucleation of the antiperovskite phase E21 occurs through spinodal decomposition of the Ni(Al,Cr,C) solid solution starting at 400 C. Heating to higher temperatures leads to partial Cr precipitation from the ordered phase and the formation of the chromium carbide Cr3C2, which reduces the carbon content of the antiperovskite phase. © 2013 Pleiades Publishing, Ltd.


Khasanshin R.H.,OAO Kompozit | Galygin A.N.,OAO Kompozit | Novikov L.S.,Moscow State University
Advances in Space Research | Year: 2015

Experimental data on mass loss of EKOM-1 polymeric composite subjecting to 40-keV electrons and protons in vacuum are discussed and interpreted. It was shown, in particular, that mass loss of the polymeric composite irradiated by protons is greater than by electrons if energies and flux densities of the particles are the same. To analyze numerically the data obtained, a mathematical model describing mass loss of the material in vacuum and accounting for the growth of its permeability is proposed. © 2015 COSPAR. Published by Elsevier Ltd. All rights reserved.


Khasanshin R.K.,OAO Kompozit | Novikov L.S.,Moscow State University
Journal of Surface Investigation | Year: 2014

The effect of 40-keV electron and proton radiation with a flux density of 5 × 10 cm-2 s-1 on the deposition of products of thermostimulated gas release from a polymer composite on a substrate made from protective K-208 glass used for the protection of spacecraft solar panels is experimentally investigated. Analysis of the obtained results shows that, unlike proton radiation, electron radiation results in an increase in the optical density of the glass and stimulates the deposition of gas-release products. It is established that the majority of effects generated as a result of exposure of the substrate to electron radiation are neutralized by protons upon combined irradiation with electrons and protons. © 2014 Pleiades Publishing, Ltd.


A procedure for calculating the penetration depth of reactions of the chemical vapor infiltration of refractory materials from the vapor phase into a porous body is proposed to select the parameters of the production process of obtaining composites with a pyrolytic matrix. The interrelation between the penetration depth of the reaction with the porous body and vapor-phase characteristics is presented. It is shown that the calculated data make it possible to reveal the regularities of developed processes and substantially shorten the number of experiments for determining the production parameters. © 2014 Allerton Press, Inc.


Khasanshin R.K.,OAO Kompozit | Vintaykin I.B.,Moscow State Technical University
Inorganic Materials: Applied Research | Year: 2014

A computational and experimental investigation of the influence of the filler particle distribution on the polymer composite material weight loss in vacuum upon irradiation with electrons is performed. The model of the radiolysis product migration in materials under investigation is proposed for numerical analysis of the experimental data. It is shown that the weight loss rates of model materials upon irradiation at fluences not exceeding the threshold values depend on the type of filler distribution. © 2014, Pleiades Publishing, Ltd.


Khasanshin R.K.,OAO Kompozit | Novikov L.S.,Moscow State University
Inorganic Materials: Applied Research | Year: 2015

The effect of electron irradiation of K-208 glass on the process of deposition of the products of thermostimulated gas emission from a high molecular weight composite is studied. The samples are irradiated in a vacuum chamber at a pressure of 10−4 Pa with electrons with an energy of 30 keV at flux densities ranging from 1010 to 2 × 1011 cm−2 s−1. The sample surfaces are investigated by the methods of atomic force microscopy (AFM). It is shown that the formation of impurity films is significantly affected by the surface structural changes caused by electrostatic discharges, the nature of which depends on the electron flux density. © 2015, Pleiades Publishing, Ltd.


Khasanshin R.H.,OAO Kompozit | Novikov L.S.,Moscow State University
Advances in Space Research | Year: 2016

When irradiating K-208 and CMG glasses by 20-keV electrons with flux densities of 1010 < ϕe <2×1011 cm-2 s-1 in vacuum 10-4 Pa, electrostatic discharges accompanied by plasma emission and destruction of glass surfaces were observed. Examination of glasses by atomic force microscopy (AFM) showed significant difference in structural changes of surfaces of K-208 and CMG samples irradiated by equal flux densities within the range from 2.0×1010 to 9.0×1010 cm-2 s-1 that can be explained by different mechanisms of removal of charge accumulated in glasses. Surface discharges generating channels on surfaces of K-208 and CMG glasses appear when ϕ ≥7.4×1010 cm-2 s-1 and ϕ ≥8.7×1010 cm-2 s-1 respectively. In average, if radiation conditions are the same and ϕ ≥1.4×1011 cm-2 s-1, the channels are 1.5 times deeper in K-208 than in CMG. © 2016 COSPAR.


Khasanshin R.H.,OAO Kompozit | Novikov L.S.,Moscow State University
Journal of Surface Investigation | Year: 2015

The surfaces of protective glasses of solar cells of spacecraft irradiated with electrons with an energy of 20 keV, a fluence of Φe ɤ 1.2 × 1015 cm–2, and a flux density of φe varying from 1010 to 1011 cm–2 s–1 are studied using atomic force microscopy. A mechanism that facilitates the development of electrostatic discharges and reduces the intensity of the electric field of the charge accumulated in CMG glass is revealed. A physical model for interpreting the obtained experimental results is proposed. © 2015, Pleiades Publishing, Ltd.


Gladkikh S.N.,OAO Kompozit
Polymer Science - Series D | Year: 2011

The article discusses the technological and strength properties of newly developed elastic coldcuring polyurethane adhesives PU-ELBO. Examples are given of applying adhesives in the units and assemblies of electric and radio components that operate under increased humidity, cyclic variations of temperature, and vibration loads. It is noted that, in a cured state, the developed PU-ELBO adhesive is characterized by minimal levels of gas emissions in vacuum and at high temperatures. © 2011 Pleiades Publishing, Ltd.


A concept of a two-stage hot isostatic pressing (HIP) cycle is developed for castings made of nickel superalloys in order to minimize plastic deformation and the recrystallization ability of their structure. At the first stage of the cycle, diffusion pore dissolution is predominant due to the motion of vacancies toward grain boundaries in a polycrystal; at the second stage, retained coarse pores are filled during plastic deformation. The effect of uniform compression pressure during HIP and microstructure defects on the vacancy diffusion in nickel superalloys is estimated. A two-stage HIP regime is developed for processing of cast gas-turbine engine blades made of a ZhS6U alloy in order to substantially decrease the shrinkage porosity and to increase the high-temperature characteristics, including the creep and fatigue resistance. © 2012 Pleiades Publishing, Ltd.

Loading OAO Kompozit collaborators
Loading OAO Kompozit collaborators