Browsing by Author "Kraft, Bastian"

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    FOR3010: Characterization of high-temperature compressive behaviour of field-assisted sintered niobium-alumina refractory composites
    (Technische Universität Bergakademie Freiberg, 2026-09-23) Günay, Gökhan; Kallien, Gregory; Kraft, Bastian; Wagner, Susanne; Schell, Karl Günter; Heilmaier, Martin; Biermann, Horst; Weidner, Anja
    Nb-Al₂O₃ refractory composites have attracted significant attention due to their excellent performance at elevated temperatures. The incorporation of both metallic (Nb) and ceramic (Al₂O₃) phases enhances interest in these materials, i.e., the combination of the high toughness and plasticity of niobium with the refractoriness, high hardness, thermal stability, and oxidation resistance of alumina. In this study, the high-temperature mechanical behaviour of Nb-Al₂O₃ composites produced via field-assisted sintering (FAST) was investigated under compressive loading. Composites containing alumina particles of different sizes were subjected to compressive tests up to 1350 °C. The results were evaluated with respect to Nb content, alumina particle size, applied stress, and test temperature. Initial and post-mortem microstructural analyses were carried out to characterise the deformation behaviour. It was observed that an increase in the metal content led to an enhancement of plasticity, while changes in alumina particle size influenced the deformation behaviour.
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    GRK 2802: Steel ceramic composite anodes based on recycled MgO–C lining bricks for applications in cryolite/aluminum melts
    (Technische Universität Bergakademie Freiberg, 2026-02-16) Yaroshevskyi, Serhii; Weigelt, Christian; Malczyk, Piotr; Roungos, Vasileios; Hubalkova, Jana; Zienert, Tilo; Kraft, Bastian; Wagner, Stefan; Aneziris, Christos
    Novel manufacturing route for composite inert anodes containing 60:40 of 316 L stainless steel and MgO powder obtained from recycled MgO-C brick material has been developed and evaluated. After burnout of residual carbon from the recycled MgO-C powder, MgO and steel were granulated and pre-sintered in order to generate agglomerates of composite material acting as coarse grains within the composite material, and thus lowering the sintering-related shrinkage. The pre-sintered granules were mixed with raw steel and MgO powder in order to achieve a high particle packing and subsequently cold isostatically pressed in the form of electrodes. All manufactured anode samples were subjected to sintering at 1350 ◦C and pre-oxidation at different temperatures – 800 °C, 900 °C, and 1000 °C. Afterwards, mechanical and electrical properties of the manufactured electrodes were characterized. The results show that upcycling of the MgO-C material enables manufacturing of sophisticated electrode products, which can be applied in the aluminum industry.