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| Tribologické vlastnosti keramických nanoštruktúrnych kompozitov | |
| Tribological properties of ceramic nanostructured composites | |
| Program: | COST |
| Project leader: | doc. RNDr. Hvizdoš Pavol, DrSc. |
| Duration: | 1.1.2008 – 31.12.2012 |
National
| Modelovanie fázových diagramov a termodynamických vlastnosti systémov pre vysoko teplotné aplikácie | |
| Modelling of phase diagram and thermodynamic properties of the systems for high temperature applications | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project focuses on the study of phases, phase equilibria and phase diagrams in systems forhigh-temperature applications. The aim is to refine the uncertainty of phase diagrams and investigate unknownparts of selected binary systems by experimental methods of differential thermal analysis, X-ray diffraction andelectron microscopy and then to model their phase diagrams and thermodynamic properties using thesemi-empirical Calphad-method. The subject of the study are binary systems with iridium. Iridium is an elementwhich, due to its thermodynamic properties, is very interesting for use in the aerospace industry and due to itshigh corrosion resistance even at very high temperatures, it may potentially be suitable for use as part of gasturbine materials. The results of the project will allow to extend the possibility of designing new materials forhigh-temperature use by computational methods without the need for time-consuming experimental testing. |
| Duration: | 1.1.2021 – 12.12.2023 |
| Prehodnotenie vplyvu intermetalickej fázy na procesy krehnutia žiarupevných ocelí | |
| Re-evaluation of the effect of intermetallic phase on embrittling processes of creep-resistant steels | |
| Program: | VEGA |
| Project leader: | Ing. Falat Ladislav, PhD. |
| Annotation: | The project intention is to investigate the effect of intermetallic Laves phase in thermally exposed 9Cr creep-resistant steels on degradation of their mechanical and brittle-fracture properties. Microstructure evolution aimed at kinetics of precipitation and coarsening of Laves phase will be studied in dependence of the conditionsof initial heat treatment. Apart from comparison of the properties of long-term thermally exposed states (i.e. with presence of Laves phase) with the properties of initial material states without long-term thermal exposition (i.e. without Laves phase), the key task will be the study of the effect of supplemental heat treatment of thermally-exposed states (without notable effect on Laves phase precipitation/coarsening) on potential modification of the properties of creep-resistant steels. The main aim of the project is to re-evaluate and eventually complete up-to now generally accepted opinion on the Laves phase considered as the main embrittling factor in creep-resistant steels. |
| Duration: | 1.1.2019 – 31.12.2021 |
| Termodynamické modelovanie ternárneho systému B-Fe-W a extrapolácia ternárnych dát pre termodynamické výpočty polykomponentných zliatinových systémov | |
| Thermodynamic modelling of the B-Fe-W ternary system and extrapolation of ternary data for thermodynamic calculations of poly-component alloy systems | |
| Program: | VEGA |
| Project leader: | RNDr. Homolová Viera, PhD. |
| Annotation: | The project links to the previous projects dealing with modelling of Fe-B-X (X= V, Cr, C, Mn) ternary systems. It is focused on the study of the phases and phase equilibria in B-Fe-W ternary system. The research results will contribute to the knowledge on the phases existence, their chemical composition, structure and equilibria in thementioned system. The main goal of the project is a creation of reliable parameter database for thermodynamic calculations in B-Fe-W ternary system by Calphad method. This database will contribute to the creation of complex thermodynamic parameter database allowing predictions of phase equilibria for wide range of systems. In the scope of the project, also poly-component alloy systems, mainly creep-resistant steels with boron, will be investigated. The investigation will be focused on phase existence and phase equilibria. For the poly-component materials, phase diagrams will be calculated using the newly-developed thermodynamic databases for ternary systems with boron. |
| Duration: | 1.1.2018 – 31.12.2020 |
| Vysokopevné elektrotechnické ocele pre elektromobily a hybridné pohony . | |
| High-strength electro-technical steels for electric vehicles and hybrid motors. | |
| Program: | VEGA |
| Project leader: | RNDr. Kováč František, CSc. |
| Annotation: | The project is focused on the microstructural design of high-strength electrical steels for hybrid motors and electric vehicles. Within the proposed project the original concept of high-strength electrical steel based on composite gradient microstructure substructure and texture through the sheet thickness arrangement, will be designed. The central part is characterized by coarse-grained microstructure with high intensity cubic texture component reinforced by coherent Cu precipitates and solid solution, characterized by excellent electromagnetic parameters. Subsurface area will consist of fine-grained microstructure reinforced by incoherent AlN precipitates and solid solution of Si, Al, Cu in the ferrite. This area is characterized by high strength characteristics and good resistance to fatigue rupture.To achieve the selected composite system a sequence of structure creation will be designed and implemented. |
| Duration: | 1.1.2013 – 31.12.2015 |
| SiNGra – Vývoj nitridu kremičitého s prídavkom multivrstiev grafénu | |
| Development of Si3N4 with addition of graphene platelets | |
| Program: | SRDA |
| Project leader: | Mgr. Tatarková Monika, PhD. |
| Annotation: | One of the ways how to improve the mechanical properties of silicon nitride is by formation of composite systems. After the discovery of graphene with its unique mechanical and electrical properties the investigation of graphene as a filler of different materials has started. Present research confirms the significant improvement of the mechanical and electrical properties of the polymer with graphene filler. It is expected that the incorporation of graphene platelets into the silicon nitride matrix improves the fracture toughness which should considerably broaden the potential application of ceramic materials. The aim of the project is to develop materials with the excellent fracture mechanical properties as well as functional properties. The parameter of the processing route and the complex of mechanical properties which are necessary for the estimation of application possibilities will be the results of the project. |
| Duration: | 1.7.2012 – 31.12.2015 |
| Mikroštruktúrny dizajn progresívnych izotrópnych elektrotechnických ocelí. | |
| Microstructure design of progressive isotropic electrotechnical steels | |
| Program: | VEGA |
| Project leader: | RNDr. Kováč František, CSc. |
| Annotation: | The project is focused on controlled evolution of microstructure and crystallographic texture in the isotropic electrotechnical steels possessing high permeability for use in electric motors with higher efficiency. Mechanisms of deformation induced and thermo activated grain boundary motion will be used during controlled development of microstructure of selective abnormal grain growth process. This will be done in order to achieve predominant intensity of (100) [0vw] and so called Goss (110) [001] texture components with simultaneous decrease of deformation texture (111) [0vw]. The mentioned crystallographic orientation will provide improvement of watt losses parameters as well as magnetic induction with simultaneous decreasing of alloying elements that will have positive impact on decreasing of heat conduction coefficient of the final material. |
| Duration: | 1.1.2010 – 31.12.2012 |
| Odolnosť proti tečeniu a tepelným šokom žiarovo-lisovaných Si3N4-SiC kompozitov s prídavkom oxidov vzácnych zemín | |
| The study of the creep behaviour and thermal shock resistance of Si3N4-SiC composites with rare-earth oxide additives | |
| Program: | VEGA |
| Project leader: | Mgr. Tatarková Monika, PhD. |
| Duration: | 1.1.2010 – 31.12.2012 |
| nanoCEXmat – Centrum excelentnosti progresívnych materiálov s nano a submikrónovou štruktúrou | |
| Centrum of advanced materials with nano and submicron sized structure | |
| Program: | EU Structural Funds Research & Development |
| Project leader: | prof. RNDr. Dusza Ján, DrSc. |
| Duration: | 20.5.2009 – 30.6.2011 |
| Deformarmačne a difúzne indukovaný pohyb hraníc zŕn pri evolúcii kubickej a Gossovej kryštalografickej orientácie v Fe-Si ferite | |
| Deformation and difusion induced grain boundary motion during cube and Goss texture development in Fe – Si ferrite | |
| Program: | VEGA |
| Project leader: | RNDr. Kováč František, CSc. |
| Duration: | 1.1.2007 – 31.12.2009 |
| Kontaktné mechanické vlastnosti konštrukčných keramických materiálov | |
| Contact mechanical properties of structural ceramics | |
| Program: | VEGA |
| Project leader: | prof. RNDr. Dusza Ján, DrSc. |
| Duration: | 1.1.2007 – 31.12.2009 |
| Vplyv parametrov žíhania na mikroštruktúru a vlastnosti heterogénnych zvarových spojov a ohybov progresívnych ocelí | |
| Influence of annealing parameters on the microstructure and heterogene ous weld joints and bends of progressive streels | |
| Program: | VEGA |
| Project leader: | Ing. Výrostková Anna, CSc. |
| Annotation: | The project deals with the influence of the cold deformation and annealing of bends on precipitation processes in new, advanced martesitic steels of P92 and E911 grades and in heterogeneous weld joints P92, E911 – TP 347 H (stabilized austenitic steel). The steels and welds have been planned for the construction of USCB-ultra-super-critical-boilers. Joints will be prepared at various technology conditions (weld metal, heat input) with two approaches of the post weld heat treatment (PWHT), namely: austenitization+tempering and tempering without austenitization. On the base of the microstructural evaluation, calculations of residual stresses, and results of mechanical tests (hardness, tensile tests at 20 adn 600°C, short trem crep test) the possibility of the omission of austenitization will be judged, that could result in decisive economical effect – energy savings and avoiding using of a large furnace for the treatmet at the temperatures above 1000°C. Experimental assesment of phase composition and thermodynamic calculations of equilibrium phases enable the investigated steels phase evolution diagrams constuction. The study of the influence of deformation on precipitation of phases in tube bends in relationship with the heat treatment used and resulted property changes is the second scope of the project, aimed to the HT optimization. |
| Duration: | 1.1.2007 – 31.12.2009 |
| AMOD – Analyticko-počítačová metóda predikcie životnosti viacfázových materiálov | |
| Analytical-computational method of lifetime prediction for multiphase materials | |
| Program: | SRDA |
| Project leader: | Ing. Mgr. Ceniga Ladislav, DrSc. |
| Duration: | 1.1.2007 – 31.3.2009 |
| Dizajn mikroštruktúry masívnych YBCO supravodičov | |
| Microstructural Design of YBCO Bulk Superconductors | |
| Program: | SRDA |
| Project leader: | Ing. Mgr. Ceniga Ladislav, DrSc. |
| Duration: | 1.3.2006 – 28.2.2009 |