Short description of the project
The main goal of this project is to study the mechanism and structural changes in electron beam welding of metals with different thermo-physical properties.
The study of the structure and mechanical properties of the welder is envisaged seam depending on the technological conditions (the linear energy introduced in the samples, type and frequency of scanning of the electronic beam and offset of (offset) of the electronic beam relative to the welding gap) of electron beam welding. It will also be studied the mechanism of formation of intermetallic phases, their structure, properties and influence on the mechanical properties of welds. They will be examined different approaches to controlling the structure and properties of intermetallic phases in the weld by optimizing the technological parameters of welding. They will be the possibilities for formation of structures with certain properties of welding gaps by introducing alloying elements by PVD methods.
The aim of the project:
Development of a novel aluminum wire with no analogue, having a composite core consisting of Al powder with integrated carbon nanostructures (AluNanoCore). The wire is intended for independent flexible production of lightweight devices with high strength properties using the method of additive layer manufacturing (ALM).
Short description of the project
In present project, deposition of innovative coatings on based of Diamond- like carbon (DLC) on silicon and implant materials (Ti and its alloys, cobalt-chromium and chromium-nickel steels) steel with low friction coefficient, improved mechanical,tribological properties and biocompatibility suitable for biomedical applications, is foreseen. The coatings will be deposition by electron-beam evaporation method which is used intensively in last years from research collectives. The dependence between morphological, tribological and technological parameters will be also tracked out. The resistance to corrosion of obtained DLC coatings will be investigated in a medium corresponded to the fluids in human body.
The obtained innovative wear and corrosion resistant coatings will give guarantee for reliability, longer exploitation life of the implants and friction decrease. Besides, deposited films will decide important problems of the society related to achievement of more effective and safe treatment in patient by implants quality improvement.
Short description of the project
The main objective of the project is to gain knowledge about the technological conditions for the production of surface alloys and coatings of lightweight composite materials based on titanium and aluminum through the methods of electron beam technologies. Deposition of alloying elements of different transition metals on the surface of the base materials (substrates) will be foreseen by PVD (Physical Vapor Deposition) methods. The samples obtained will be treated via a scanning electron beam. To accomplish this goal, the following tasks are introduced:
Short description of the project
On the basis of microstructural studies of TRIP-phase transformations in alloys of iron and super alloys on cobalt base, the clamping mechanism, linking the microstructural parameters of the structure and the energy of the defects in the arrangement with the maximum tendency to phase formation, external deformation impacts will be investigated. The influence of the technological parameters of electron beam treatment (kinetic energy and time of impact of accelerated electron flux on alloys) on the TRIP effects will be studied.
Summary
The aim of the project is to study the possibilities of formation of intermetallic coatings in the system of Ti-Al-Nb, as well as to improve the functional properties on the surface of pure Al and aluminum alloys by incorporation of TiCN and AlN nanoparticles via electron beam surface treatment. The first involves a deposition of bilayer Al-Nb coating on Ti substrate and subsequent electron beam treatment. The second involves an incorporation of TiCN and Al nanoparticles by electron beam surface treatment. The approach is based on a deposition of films mixture of the nanoparticles and chloroform and subsequent electron beam treatment. All samples will be studied in view of their crystallographic structure and microstructure by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The microhardness will be also studied. It is expected that the results of the project will give an opportunity for introduction of light alloys in new different practical and industrial applications.
Short description of the project
The aim of the project is obtaining new fundamental knowledge about the mechanism of interaction of concentrated energy sources with the liquid bath during electron beam(EBW) and plasma(PW) welding. The first involves directly measuring with modern techniques (thermal camera, high-speed CCD camera, digital measurement of the temperature etc.) of: the temperature of the plasma, the anode and cathode regions of the arc; the characteristics of the electron beam, including diameter and power density; movement of the liquid phase in the weld pool and the dynamics of the keyhole; determination of energy losses and efficiency.
The second approach involves the development of a mathematical models and their realization into simulation models of the physical processes during EBW and the arc PAW at different technological parameters. The implementation of this approach involves: developing a model of cathode area including heating the cathode, the emission of electrons taking into account the effect of Schottky by the local electric field strength at the cathode; developing a model of the anode region, taking into account both the reflection of electrons and their entry into the treated metal giving away their energy; determining the distribution of the energy flux density from the interaction of electrons with the parent metal; determining the diameter and shape of the electron beam; developing a model of the arc column for PAW and determining the distribution of energy flow density during the interaction between the plasma and the material being processed.
Short description of the project
Aluminum alloys are widely used together with titanium alloys in modern automotive and aerospace industries because they have the most suitable qualities for this application. However, it is required in some cases to have a higher surface hardness and wear resistance. As with modification and grain refining with nanopowders hardening of metals and alloys is achieved, we intend to increase the surface hardness and wear resistance of chosen materials by means of nanoparticles applying with an appropriate paste on the metal surface and irradiation the surface with electron beam.
This project aims to obtain modified with nanoparticles of TiCN and AlN layers on aluminum and AlSi12Cu2NiMg alloy substrate by means of selective electron beam melting with increased hardness and wear resistance and clarify the processes of nucleus and structure formation in conditions of rapid crystallization.
Short description of the project
The project aim is to elaborate a new and advanced technology for development of gradient functional biocompatible surfaces with complex physicochemical, mechanical, medicobiological properties providing close interaction between implant and cells and extending the device 'in vivo' life.
Complex of modern examination methods will be used: optical and ålectron microscopy with software for image processing; composition ànd phase analysis; profilometry; adhesion, ålectrochemical, mechanical, tribological, hydrophilicity, cytotoxicity tests, etc. The variety of the vacuum technologies used as well as the comprehensive methods and approaches for analysis and characterization of the surfaces will undoubtedly upgrade the professional qualification of the scientists, especially that of the doctoral and post-doctoral researchers.
Main aim
The aim of the research project is to investigate the possibility of deposition of wear-resistant multilayer coatings on tool steels by a combined method, consisting of electron beam treatment, plasma nitriding and direct current magnetron sputtering.