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| DESICAEX – Vývoj karbidu kremičitého pre extrémne aplikácie | |
| Development of silicon carbide for extreme application | |
| Program: | SRDA |
| Project leader: | Ing. Hanzel Ondrej, PhD. |
| Annotation: | The proposed project is oriented towards development of fully dense silicon carbide ceramics without traditional oxide sintering additives or with addition of trace amount of metals (Al, Fe) at sintering temperature lower than temperature (T < 2100°C) required for preparation of solid-state sintered SiC. Project will be focused on comprehensive understanding of sintering mechanisms and study how modification of silicon carbide powders and/or addition of very small amount of metals (Al, Fe) can possibly influence and lower sintering temperature for preparation of fully dense silicon carbide. Due to the increasing interests and demands in energy applications, atmospheric re-entry vehicles, propulsion-system components, aerospace applications, parts of rocket engines, etc. is inevitable also characterize high-temperature properties (thermal conductivity, high-temperature strength, oxyacetylene torch resistance) of prepared silicon carbide ceramics. So, thermal conductivity up to 1500°C, high-temperature strength in temperature range 1500 – 2000°C and oxyacetylene torch resistance at temperature higher than 1700°C will be investigated and effect of powder modification, sintering parameters and microstructure on high-temperature properties will be studied and evaluated |
| Duration: | 1.9.2025 – 31.8.2029 |
| Žiadúce a nežiadúce interakcie roztavených fluoridov s materiálmi na báze kritických prvkov | |
| Desirable and undesirable interactions between molten fluorides and materials of critical elements | |
| Program: | VEGA |
| Project leader: | Ing. Kubíková Blanka, PhD. |
| Annotation: | The submitted project is focused on the study of desirable and undesirable interactions of molten fluoride systemswith materials based on the selected critical elements, the recycling rate of which is minimal in the EU. In thiscase, controlled physico-chemical processes are considered desirable interactions, in contrast to undesirableinteractions, primarily in connection with the corrosion of construction materials. The research will be focused onthe physicochemical and thermochemical analysis of molten fluorides, the study of solubility/corrosion resistanceof materials in molten salts, the synthesis of new substances, and spectral and diffraction analysis of puresubstances, molten mixtures, and solidified mixtures after experiments. |
| Duration: | 1.1.2024 – 31.12.2027 |
| Fluoridové taveninové systémy pre zelenú výrobu hliníka bez produkcie CO2 | |
| Molten fluoride systems for green production of aluminium without CO2 emissions | |
| Program: | VEGA |
| Project leader: | Ing. Šimko František, PhD. |
| Annotation: | The proposed project is related to complex phase and physico-chemical analysis of multicomponent nMF-AlF3 systems (M = Na, K, n=3-1.2) with the addition of metal oxides Al, Fe, and Ni where compounds based on Fe and Ni are represented corrosion products from the use of inert anodes in aluminium CO2 less production. These are the so-called low-temperature electrolytes, whose research has recently increased attention related to the development and application of inert anodes. The aim of the project will be to define the solubility of oxides/spinels, the phase composition of the systems and to identify the individual components, arising from the interaction between the corrosion products and the electrolyte. These systems will be studied to determine the relationship between the structure and their physicochemical behavior by using either of spectral methods in-situ in the molten state, or by ex-post analysis of the solidified samples, and by physicochemical analysis of high temperature molten systems. |
| Duration: | 1.1.2022 – 31.12.2025 |