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| Novel Ultra-High Temperature Ceramic Matrix Cpmposites for Application in Harsh Aerospace Environments | |
| Novel Ultra-High Temperature Ceramic Matrix Cpmposites for Application in Harsh Aerospace Environments | |
| Program: | JRP |
| Project leader: | Ing. Tatarko Peter, PhD. |
| Duration: | 1.1.2024 – 31.12.2026 |
National
| 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 |
| Keramické kompozitné materiály na báze SiC s vysokou tepelnou vodivosťou | |
| Silicon carbide ceramic composite materials with high thermal conductivity | |
| Program: | VEGA |
| Project leader: | Ing. Hanzel Ondrej, PhD. |
| Annotation: | The main goal of this project is preparation of dense silicon carbide (SiC) ceramics without sintering additives and/or silicon carbide composites with very low content (up to 1 wt. %) of sintering additives (oxides of rare-earth elements), with high thermal conductivity. The research will be focus on study of the effect of a-SiC and ß-SiC phase content on thermal conductivity of silicon carbide without sintering additives and the second research direction will be focus on study of the effect of amount and type of additives (oxides of rare-earth elements) on the thermal conductivity of SiC composites. In order to achieve project objectives, research focused on preparation of dense silicon carbide or SiC composite at relatively low sintering temperature (up to 2000°C) will be necessary. This process comprises study of SiC powders or SiC composite powders modification by freeze granulator, thermal annealing of granulated powders and followed by granules sintering with field assisted sintering technology (FAST). |
| Duration: | 1.1.2025 – 31.12.2028 |
| NEOCAR – Ultra-vysokoteplotné karbidy so zvýšenou oxidačnou odolnosťou | |
| Novel enhanced oxidation-resistant ultra-high temperature carbides | |
| Program: | SRDA |
| Project leader: | Ing. Tatarko Peter, PhD. |
| Annotation: | The improvement of oxidation resistance of ultra-high temperature ceramics (UHTCs) has critical importance in meeting the growing need for applications used at temperatures exceeding 2000 °C in oxidizing atmospheres such as hypersonic vehicles and spacecraft. Recently, with the aid of the exploration of multi-principal element ceramics, consisting of four or more different cations or anions stabilized by the configurational entropy, a vast new compositional space has opened up to develop novel UHTCs with enhanced oxidation resistance. However, to design such materials through the prediction of their complex oxidation processes, it is fundamental to establish a comprehensive understanding of the mono and binary transitional metal carbides that is targeted in the present project, something that is currently missing. Thus, the main aim of the project is to develop novel oxidation-resistant UHTCs through a systematic experimental based study in which the high-temperature properties (oxidation/ablation resistance, thermal shock resistance etc.) and mechanical behaviour of mono and binary refractory carbides will be studied. Different secondary phase materials with the incorporation of silicon will also be tested in the form of SiC and transitional metal silicides, which are known as protective glassy phase-forming compounds that can further improve the oxidation resistance of newly developed UHTCs. In addition to the understanding of the oxidation and mechanical behaviour of these ceramics and composites, the prediction of the models established will be validated by the synthesis of new oxidation-resistant 3-, 4- and 5-metal carbide systems that will be also tested experimentally. The accomplishment of the present project will generate fundamental knowledge that is needed for the design of novel more complex multi-principal element ceramics. Filling this lack of knowledge would be of great importance for whole materials science community. |
| Duration: | 1.7.2023 – 30.6.2027 |
| Nová generácia termoelektrických materiálov pre udržateľnú energiu | |
| Next Generation Thermoelectrics for Sustainable Energy | |
| Program: | Plán obnovy EÚ |
| Project leader: | Ing. Tatarko Peter, PhD. |
| Annotation: | The aim of the project is to build up a new excellent research team with the state-of-the-art infrastructure to design and develop new generation thermoelectric materials with significantly improved efficiency of energy conversion. The project proposes a unique and innovative approach to design new entropy stabilised perovskite oxides to generate new significant knowledge and understanding of the effect of multi-principal elements doping at both A- and B-sites of ABO3 perovskite structures on their thermoelectric performance. In addition, the effect of non-equimolar multi-principal elements doping on thermoelectric properties of perovskite oxides will be investigated for the first time. The project also proposes a new strategy in manufacturing of perovskite oxides to further improve their thermoelectric performance by the combination of entropy stabilisation approach with the nanostructuring design and vacancies formation approaches. The proposed methodology and approach will significantly contribute to the ongoing effort to reach a climate neutral Europe by 2050. |
| Duration: | 1.4.2024 – 30.6.2026 |