Authors:
Serhii Yaroshevskyi | Techische Universität Bergakademie Freiberg | Germany
Dr. Christian Weigelt | Techische Universität Bergakademie Freiberg | Germany
Piotr Malczyk | Techische Universität Bergakademie Freiberg | Germany
Dr. Vasileious Roungos | IKFVW/TU Bergakademie Freiberg | Germany
Bastian Kraft | Institute for Applied Materials - Ceramic Materials and Technologies, Karlsruhe Institute of Technology | Germany
Dr. Jana Hubálková | Technische Universität Bergakademie Freiberg | Germany
Dr. Tilo Zienert | TU Bergakademie Freiberg | Germany
Stefan Wagner | Institute for Applied Materials - Ceramic Materials and Technologies, Karlsruhe Institute of Technology | Germany
Prof. Dr.-Ing. habil. Christos G. Aneziris | Techische Universität Bergakademie Freiberg | Germany
Development and utilization of a novel manufacturing route for composite electrodes containing 80:20, 60:40, and 40:60 volumetric ratios of 316L stainless steel to recycled MgO powder have been conducted. After burning residual carbon from recycled MgO-C powder, MgO and steel were granulated and pre-sintered in order to create analogs of coarse grains of composite material as in refractory coarse-grained materials. These pre-sintered granules were mixed with raw steel and MgO powder in order to form dense particle distributions and with help of processing aids, the mixture was subsequently extruded in form of electrodes with a diameter of 20 mm. All produced electrodes then underwent sintering and pre-oxidation under different temperatures – 850 °C, 1000 °C, and 1200 °C.
According to this approach, the shrinkage of the electrodes based on the pre-sintered granules was less than 3%. This enables the manufacturing of big electrode components.
Manufactured electrodes were studied with the aid of SEM/EDS and XRD, mechanical properties were studied using a 3-point bending test and electrical conductivity was determined at room temperature. Promising corrosion tests took place in aluminum and cryolite melts.