АНАЛІЗ ЕЛЕКТРОМАГНІТНОГО РАФІНУВАННЯ МЕТАЛЕВИХ РОЗПЛАВІВ ВІД НЕМЕТАЛЕВИХ ВКРАПЛЕНЬ У ПІНОКЕРАМІЧНИХ ФІЛЬТРАХ: Procesi littâ, 2025, Vol 4 (162), 3-11

• Datum: 2025
• Hauptverfasser: Середенко, В.О., Середенко, О.В.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2025
• Schlagworte: електромагнітне рафінування; металеві розплави; неметалеві вкраплення; пінокерамічні фільтри
• Online Zugang: https://plit-periodical.org.ua/index.php/plit/article/view/295
• Назва журналу: Casting Processes

Based on the analysis of methods for organizing electromagnetic influences on the process of retaining non-metallic inclusions in the pores of foam ceramic filters during the filtration of liquid alloys, the prospects of using a scheme of crossing constant magnetic and electric fields at right angles were determined, the action of which enhances the gravitational sedimentation of particles in the direction of non-conductive pore walls and the fixation of inclusions on them. It is shown that the nonlinearity of the pore channel and the unevenness of their cross-sections along the entire length of the channel significantly affect the change in both the direction of the electric current and its local densities. In contrast, the lines of force of a homogeneous magnetic field for which the filter and the heterogeneous melt are almost homogeneous media in terms of magnetic permeability do not undergo distortions. It has been determined that such features affect the force electromagnetic action, which generates local circulation and screw movements in the melt flow in the filter pores and contribute to the retention of non-metallic inclusions in the filter pores, especially in the zones of depressions in the pore walls. The complexity of the physical processes of electromagnetic refining of liquid alloys from non-metallic inclusions can to some extent be investigated on physical models. Based on the theory of similarity, a physical model of filtration in a standard Ceralu® Al2O3 ceramic foam filter with high chemical resistance from the Drach company (Germany) of an aluminum melt obtained from a charge contaminated with non-metallic inclusions under the application of constant magnetic and electric fields has been calculated. The main criteria characterizing the kinematics of particles in the melt flow under the action of gravity (Reynolds and Froude) have been determined and the condition of their identity for the physical model and the full-scale system has been ensured. The similarity of the synergistic action of gravity and electromagnetic influence on a non-conductive particle in an electrically conductive melt in a model and full-scale system was also realized. On this basis, the scale coefficients of the physical model of the flow through the pores of the aluminum melt filter and the electromagnetic influence on the filtration process were calculated.