Ligas de alta entropia autolubrificantes, dopadas com CaF2 , produzidas por fusão seletiva a laser

This project has scientific (1) and societal (2) objectives and is strategic for IPN, IPLeiria and the Associated Laboratory ARISE (3). (1) Scientific objectives - Production of self-lubricant CaF2-reinforced HEAs, as thick coatings, on steels and cermets parts by SLM to be used at high temperatures, e.g. moulds for glass injection. (Near) single-phase HEAs mixtures of FeCrMnAlX (X=V,Ti) (with 20% at of each metal) will be produced from elemental powders, by mechanical alloying (MA). Then The mechanical alloyed FeCrMnAlX (X=V,Ti) mixtures will be reinforced with 10 to 20 % of CaF2 particles by MA. This material is a solid lubricant and will contribute to reduce friction and prevent adhesion of the final components surface. Finally, new composite HEA-based coatings of FeCrMnAlX (X=V,Ti) + CaF2 will be deposited on steels and cermets from the mechanically alloyed mixtures. Is it expected that these composites present good mechanical and tribological properties at increasing temperatures. - To use an additive technique such as SLM to produce new HEA composites as coatings, avowing the quite expensive and complex casting processes needed for the manufacture of the superalloys. - to improve the fatigue resistance, ductility, and fracture, and to decrease the coefficient of friction and wear of the current HEAs. (2) Societal objectives - To reduce the energy losses associated with the tribological contacts (friction and wear) of components at high temperatures and the periods for inspection, repair, and replacement tasks. (3) Strategic objectives. This project joint researchers from two thematic lines of the Associated Laboratory ARISE of FCT (New Materials and Components, and Advanced Production Systems and Processes), through the R&D Units CEMMPRE and CDRSP, which one of the development vectors addresses the design and development of new advanced materials and components from powders. The ARISE is fully committed to supporting the UN Agenda 2030 Sustainable Development Goals (SDG), in form of R&D and public policies with strong collaboration with industries and international development organizations. This project will contribute mainly to SDGs 9 (Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation), but in small scale to SDGs 13 (Take urgent action to combat climate change and its impacts) and its fully aligned with Portuguese development strategies ENEI and EREI.