Khaskov M.A.,Russian Scientific Research Institute of Aviation Materials
Polymer Science - Series B | Year: 2017
The article reviews the using of thermal analysis methods and mathematic modeling of kinetics of chemical processes for the creation of isothermal transformation diagrams of thermosetting binders. Differential scanning calorimetry (DSC), temperature modulated DSC, gel-timer and thermogravimetry are used for the construction of isothermal transformation diagrams with vitrification and gelation curves, areas of thermal stability and post-curing. The Time-Temperature-Transformation diagrams obtained can be used for optimization of time-temperature schedules for polymer matrix composites fabrication at the laboratory scale. © 2017, Pleiades Publishing, Ltd.
Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: AAT.2013.8-1. | Award Amount: 3.42M | Year: 2013
The PoLaRBEAR (Production and Analysis Evolution For Lattice Related Barrel Elements Under Operations With Advanced Robustness) project focuses on reliable novel composite aircraft structures based on geodesic technology aiming at a significant higher Robustness and Technology Readiness Level (TRL). While the global structural behavior of composite geodesic structures is investigated and understood in a top-down approach in EU-ALaSCA, PoLaRBEAR will follow up in a bottom-up approach on local level analyzing the geodesic structures in terms of in-operation demands for higher TRL. The main objectives of this research proposal are: Industrial highly automated process for cost efficient barrel manufacturing Advanced reliability of geodesic structures under operational loads Design rules for robust grid structures The aim is to promote a competent cooperation in the development of light, low-cost airframe fuselage structures made with a new generation of composite materials and based on geodesic / iso-grid technologies under operations. The proposal will enhance the cooperation in research and in innovation between the European Union and the Russian Federation in the field of civil transport aircraft.
Khaskov M.A.,Russian Scientific Research Institute of Aviation Materials
Russian Journal of Applied Chemistry | Year: 2016
Time–temperature–transformation diagrams are convenient forms of presenting rheokinetic data on curing of thermosetting binders. However, in curing of thick samples, because of the heat release in curing in combination with relatively low values of thermal conductivity and heat capacity of the majority of thermosetting binders, the rheokinetic features can differ significantly from those observed with thin films and small samples. The paper deals with the construction of the three-dimensional time–temperature–transformation diagram taking into account the thermal properties of the binder. The changes in curing dynamics and appearance of temperature gradients inside the sample with increasing thickness of the binder layer being cured are taken into account. The use of the extended diagram for optimizing the curing conditions for polymer matrix composites is suggested and considered. © 2016, Pleiades Publishing, Ltd.
Khorev A.I.,Russian Scientific Research Institute of Aviation Materials
Welding International | Year: 2016
The special features of weldable structural alloys for high-temperature applications (up to 700 °C) are described: universal application, the possibility of producing semi-finished sheet products, high weldability and capacity for sheet stamping, bending and flanging. This increases the coefficient of utilization of the metal 4–6 times and widens the range of produced components and sections by a factor of 2–4. © 2016 Taylor & Francis.
Morozova G.I.,Russian Scientific Research Institute of Aviation Materials
Metal Science and Heat Treatment | Year: 2013
Factors influencing self-organization of the chemical composition of the γ′/γ matrix of refractory nickel alloys are considered in accordance with the rule of alloying balance. The imbalance of alloying is shown to affect the operating characteristics of the alloys. © 2013 Springer Science+Business Media New York.
Solntsev S.S.,Russian Scientific Research Institute of Aviation Materials
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2016
Special heat-shielding materials cover the outer surfaces of space shuttles. These materials must also be protected from erosion, moisture, and so forth by thermal control coatings. A series of works was conducted at VIAM on the development and improvement of erosion-resistant thermal control coatings and their manufacture and usage technologies. © 2016 Springer Science+Business Media New York
Volkova E.F.,Russian Scientific Research Institute of Aviation Materials
WIT Transactions on the Built Environment | Year: 2014
The interest in magnesium based alloys as structural metal material is due to their low weight, good mechanical and technological properties, high special strength, etc. So magnesium base alloys can compete successfully in physical and mechanical characteristics with other light structural materials especially in the fields where decrease in the mass is of primary significance. The aim of the present work was to study the influence of phase and structural changes in the main properties of commercial magnesium based alloy MA14 (ZK60 A) under deformation and heat treatment parameters. The microstructure was investigated with the use of an optical inverted microscope. The phase composition was investigated by chemical phase analysis with an X-ray analysis of each insulated phase. It is found, that there are primary phases Mg2Zn3, ZrZn2 and Zr3Zn2. Sometimes phases ε-ZrH2,δ-ZrH, Zr2Al can be present in phase composition. All the phases are the hardening ones. The phase quantity, size, morphology correlate with the condition of the magnesium alloy so traditional deformation and heat treatment has not had much influence on qualitative phase composition; only on the phase and grain size. Now it is stated that the most effective processing for receiving the elevated alloy properties is hydrostatic extrusion. The final operation of hydrostatic extrusion of magnesium alloy semi products causes the well-disposed structure and phase changes. Thus the high strength properties of the cheap commercial magnesium alloy MA14 are obtained: tensile strength is more than 380 MPa; tensile yield strength is more than 340 MPa. © 2014 WIT Press.
Solntsev St.S.,Russian Scientific Research Institute of Aviation Materials
Russian Journal of General Chemistry | Year: 2011
High-temperature composite materials and coatings developed in the RIAM, specifically construction composite materials with glass, glass-ceramic, and ceramic matrices, for use at 700-1500°C, ceramic composites on the basis of poly-carbosilanes, erosion resistant coatings with the effect of thermal control for heat shield systems of perspective aerospace technics, are reviewed. These coatings combine a complex of properties: high radiating capacity, phase stability, thermal shrinkage resistance, resistance against acoustic, vibration, atmospheric factors, etc. Technological coatings to protect steels and Ti and Ni alloys during heat treatment and isothermal and hot die forging are developed. New type enamels, pasts, thick-film electric heaters, etc., are described. © Pleiades Publishing, Ltd., 2011.
Petrova A.P.,Russian Scientific Research Institute of Aviation Materials
Polymer Science - Series D | Year: 2014
The main stages of gluing technology—from surface preparation for gluing to control of the quality of adhesive joints—are considered. Methods of preparation for gluing of surfaces of polymer materials and metals are given. Recommendations for preparation and coating of adhesives are given. The main parameters of the adhesive curing and apparatus used are described. © 2014, Pleiades Publishing, Ltd.
Murashov V.V.,Russian Scientific Research Institute of Aviation Materials
Polymer Science - Series D | Year: 2016
This paper considers the physical bases of the ultrasound reverberation method that can detect defects in gluing of double-layer structures made of dissimilar materials, such as metal–plastic and plastic–metal. The advantages and disadvantages of this method are specified. It is shown that the capabilities of the reverberation method significantly expand when using a spectral version of reverberation based on registration of changes in the shape of the envelope of the amplitude spectrum of echo pulses depending on the quality of bonding. © 2016, Pleiades Publishing, Ltd.