| Project Title: | Formation of Graded Structures and Properties in Metal Matrix Composites by use of Electromagnetic Fields |
| Project Period: | 2010 |
| Project Leader: | Prof. Ludmil Drenchev, DSc |
| Annotation: | The main goal of the project is to develop instruments for micro- and macrostructure design in functionally graded metal matrix composites (MMCs). The efforts are directed to application of Lorentz force (LF) as instruments for in-situ MMCs structure control. The application of LF allows to control the direction and intensity of sedimentation processes. Such approach is recently used for structural control or as a specific antigravity instrument, but is very far from effective industrial applications. In this study are used Aluminum based composites DURALCAN reinforced by SiC particles. |
| Recieved Results: | Great number of experiments with composite system DURALCAN were carried out. Composite materials with graded distribution of reinforcing phase (SiCP) were obtained. It is shown that application of Lorentz force during solidification can accelerate 4-5 times sedimentation effects in the system considered. The materials obtained possess gradually changing hardness proportional to the gradually changing volume fraction of the reinforce phase. |
| Funded by: | National Science Fund, Bulgaria, Programme "Sabbatical Year for the Bulgarian Scientists" |
| Project Title: | Glass forming ability, structural relaxation, and (nano) crystallization of the ribbon and bulk amorphous and nanocrystalline alloys based on the Metals Fe, Co, Ni, Zr, and Al for the mechanical and magnetic applications, studied by thermo analytical, str |
| Project Period: | 2005-2009 |
| Project Leader: | Prof. DSc Krasimir Russev |
| Annotation: | Object of research are 34 ribbon and bulk amorphous and nano-crystalline alloys as follows:
-9 binary alloys Co100-xZrx (7 ≤ x ≤ 78.5 at. %)
-2 ternary alloys Co-Nb-Zr (Co86Nb9Zr5 и Co85Nb9Zr6)
-2 binary alloys Fe25Zr75 и Ni25Zr75
-6 binary alloys Cu100-xZrx (35.7 ≤ x ≤ 60 at. %)
15 Al based alloys of which,
- 3 alloys containing yttrium: Al92Y8, Al90Y10, Al88Y12;
- 1 alloy containing tantalum: Al85Ni9.6Ta5.4;
- 4 alloys containing cerium: Al92Ce8, Al90Ce10, Al90Ni5Ce5, Al85Ni5Co2Ce8
- 5 alloys containing uranium: Al92U8, Al90U10, Al90Ni5U5, Al85U8Ni5Co2, Al85U5Ni8Co2
- 2 alloys containing gadolinium: Al92Gd8, Al85Ni5Co2Gd8 |
| Recieved Results: | Original data for thermal stability (onset temperature crystallization) Ton, strength σf and glass forming ability of the melt- mclassic have been obtained for the studied alloys. It is found that the most stable thermally alloys at crystallization generally have a high strength. |
| Funded by: | Ministry of Education and Science,National Science Fund, Bulgaria |
| Project Title: | A new method for the preparation of carbides of refractory metals (B, W and Ti) |
| Project Period: | 2005-2009 |
| Project Leader: | Assoc. Prof. PhD Eng. Stoyko Gyurov |
| Annotation: | The main task of project is investigation of processes characterizing a new method for producing carbides of refractory metals B, W and Ti. The essence of the method consists in obtaining carbides by carbothermal reduction and subsequent carbidisation of precursor (starting material), which is oxide of the corresponding refractory metal, coated with a carbon-hydrogen containing substance (CHCS). |
| Recieved Results: | Original data of the processes of destruction of the polyvinyl alcohol, polypropylene, and phenol-formaldehyde resin have been obtained. Regularities of the process and selection of the optimal technological regimes to obtain CHCS have been established. The distribution of the size and shape of the carbide powders thus obtained are the same as the starting oxide powders. |
| Funded by: | Ministry of Education and Science, National Science Fund, Bulgaria |
| Project Title: | Investigation of the Coating Process and the Formation of Nanoactivated Carbon for the Production of Sintered Components from Low-alloyed Steel Powders |
| Project Period: | 2011-2014 |
| Project Leader: | Assoc. Prof. PhD Eng. Ljubomir Anestiev |
| Annotation: | Five main groups of processes, which play a key role in the sintering, and the formation of the microstructure of low alloy steel powders coated with hydrocarbon and mixed with graphite, have been studied and identified. |
| Recieved Results: | Theoretical and computer models have been developed to the processes of sintering of low-alloy steel powder coated with nano-carbon and mixed with graphite.Optimal conditions of sintering have been determined based on experimental data and results of computer modeling (thermodynamic model of the sintering process) |
| Funded by: | Ministry of Education and Science,National Science Fund, Bulgaria |
| Project Title: | Investigation of diffusion, the permeability and solubility of hydrogen in titanium and titanium alloys for use in aircraft industry |
| Project Period: | 2011-2014 |
| Project Leader: | Assoc. Prof. PhD Eng. Ljubomir Anestiev |
| Annotation: | The processes of accumulation of hydrogen in titanium alloys have been analyzed. Theory explains the connection between the pressure in the reaction chamber of the experimental system and the degree of conversion and decomposition of hydride and nitride inclusions in titanium alloys. During the execution of the project are developed models, allowing the determination of the activation energy, E, and pre-exponential factor ko of decomposition reactions directly from experimentally obtained pressure - temperature dependencies. The Models are: 1. Without limiting processes; 2. Limiting the transport processes (diffusion of gases in the model); 3. Limiting the kinetic processes. |
| Recieved Results: | Data have been obtained for the diffusion, the permeability and solubility of hydrogen in titanium and titanium alloys.In preparation is patent with tentative title: „A method for preparing powders of titanium and titanium alloys”. |
| Funded by: | Ministry of Education and Science, National Science Fund, Bulgaria |
| Project Title: | Modeling of the properties and optimization of composition of iron-based alloys used in mechanical engineering |
| Project Period: | 2011 – 2014 |
| Project Leader: | Assoc. Prof. Dr. Yavor Lukarsky |
| Annotation: | It is developed a promising steel grade, intended for automotive industry with the following chemical composition : C = 0,35%; Si = 1,25%; Mn = 1,75%; Ni = 0,3%; S, P = 0,025%; Cr = 1,25%. The steel, at suitable heat treatment, has exploitation parameters with 10 -15% higher than those of a currently used steel grade. |
| Recieved Results: | It was produced a promising steel grade, intended for automotive industry |
| Funded by: | Ministry of Education and Science, National Science Fund,Bulgaria |
| Project Title: | Multifunction IMS developed casting complex |
| Project Period: | 2008 – 2009 |
| Project Leader: | Prof. DSc E. Momchilov |
| Annotation: | It is developed and implemented a multifunctional system for gas counter pressure casting for the needs of scientific research and have been carried out activities in the Institute in area of studying metallic materials, Ningbo, P. R.China. |
| Recieved Results: | It is created a base for development of the method for gas counter pressure casting and conducting of joint research in both Institutes |
| Funded by: | China North Industries Corp. - P.R.China |
| Project Title: | Development of corundum based formulations and technologies for the production of ballistic corundum ceramics |
| Project Period: | 2006 – 2007 |
| Project Leader: | Assoc. Prof. Luben Lakov, PhD |
| Annotation: | The project is aimed to the necessity of implementation of ballistic ceramics for protection of people, mobile and stationary equipment. |
| Recieved Results: | During implementation of the project are created formulas and technology for manufacturing ballistic corundum ceramics, which meet the required specifications of the international standards. Developed are plates for body armor with different shapes and sizes, and protection plates resistant to high-speed kinetic impact. |
| Funded by: | National Innovation Fund to Bulgarian Small and Medium Enterprises Agency |
| Project Title: | Research on the technological processes for manufacture of heat-insulation material foam glass in model foaming unit of the new vertical workstation |
| Project Period: | 2009 – 2013 |
| Project Leader: | Assoc. Prof. Luben Lakov, PhD |
| Annotation: | The project is related to energy efficiency and utilization of household waste glass. |
| Recieved Results: | The model of vertical workstation and technology for manufacture of foam glass plates are created. The first quantities of plates for remediation of civil and industrial sites are manufactured. |
| Funded by: | National Science Fund ,Ministry of Education and Science |
| Project Title: | Development and examination of new technology and horizontal model unit for manufacture of composite thermo-insulation materials in the form of lumps or large granules of foam glass of household waste glass |
| Project Period: | 2012 – 2014 |
| Project Leader: | Assoc. Prof. Luben Lakov, PhD |
| Annotation: | The project is related to energy efficiency and utilization of household waste glass. |
| Recieved Results: | It is created the model of horizontal workstation. Developed is the technology for manufacture of a palette of foam glass granules needed for manufacture of thermo- and sound insulation panels. |
| Funded by: | Operational Programme "Development of the Competitiveness of the Bulgarian Economy" |
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