Univerzitná knižnica - Vedecké odborné časopisy
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Item Overcasting ako inovatívna metóda spájania kovových materiálov(University of Žilina, 2025) Medňanský, Martin; Brůna, MarekThis article focuses on the research of innovative metal casting technology of overcasting (or compound casting) as a progressive method of joining metal materials in different phase states (solid-liquid). Overcasting allows the creation of bimetallic components with a diffusion-bonded interface that combine the advantageous properties of the matrix and core. It can offer high efficiency, greater design flexibility and weight savings, if suitable materials are joined. The article reviews different approaches to joining similar and dissimilar materials.Item Výskum hybridných hliníkových odliatkov s použitím penových jadier(University of Žilina, 2024) Medňanský, Martin; Brůna, MarekThe paper focuses on the technological challenges posed by the production of experimental hybrid castings by overcasting technology. Theoretically, using this technology provides lower casting weight while maintaining positive mechanical properties and improves the energy absorption capability of the component. The effect of the pressure used during the foaming of the cores on the relative density of the metal foam component was experimentally evaluated. The challenge of the technology is the interface between the casting and the oxide coated core surface. Surface-treated cores were cast and their interfaces were observed microscopically. The experimental results showed a positive effect of the presence of AlPO4 in the interface to prevent the penetration of liquid metal into the pores of the foam core.