GRK 2802: Anodes based on MgO-C Recyclates and 316L Steel for Prospective Aluminium Fused-Salt Electrolysis Application

Gehre, Patrick; Yaroshevskyi, Serhii; Kaiser, Patricia; Brachhold, Nora; Hubálková, Jana; Aneziris, Christos

GRK 2802: Anodes based on MgO-C Recyclates and 316L Steel for Prospective Aluminium Fused-Salt Electrolysis Application

Type of the data datacite.resourceTypeGeneral	Dataset
Type of the data datacite.resourceTypeGeneral	Image
Type of the data datacite.resourceTypeGeneral	Text
Total size of the dataset datacite.size	234219455
Author dc.contributor.author	Gehre, Patrick
Author dc.contributor.author	Yaroshevskyi, Serhii
Author dc.contributor.author	Kaiser, Patricia
Author dc.contributor.author	Brachhold, Nora
Author dc.contributor.author	Hubálková, Jana
Author dc.contributor.author	Aneziris, Christos
Upload date dc.date.accessioned	2026-09-25T15:06:48Z
Publication date dc.date.available	2026-09-25T15:06:48Z
Publication date dc.date.issued	2026-09-25
Abstract of the dataset dc.description.abstract	Every year, approx. 28 million tons of used refractories accumulate worldwide. The majority of them are used as aggregates for road construction (downcycling) or are deposited in landfills. For ecological and economic reasons, an increased research potential was identified in recent years, dedicated to increasing the recycling rate and finding new markets and application fields with a higher value of the refractory recyclates. The study presents the current findings of the development of inert electrodes for the aluminum fused-salt electrolysis composed of steel and MgO gained from MgO-C recyclates. To withstand the chemical attack of molten aluminum and cryolitic melts, the metal-ceramic composites were preoxidized (PO) at 800 °C, 900 °C, and 1000 °C. The microstructure after each PO thermal treatment was analyzed. After PO at 800 °C, a (Cr,Fe)3O4 spinel-like phase and Fe-O Mg-O solid solution form. After PO at 900 °C, a larger amount of the Fe-O Mg-O solid solution and a (Cr,Fe)2O3 solid solution around the steel grains was identified. Furthermore, the electrical conductivity of the metal-ceramic-composites preoxidized at 900 °C amounts to 1.49·102 S·cm-1 and hence is in the range of carbon, which exhibits a value of 1.54·102 S·cm-1. Additionally, the impact of different preoxidation treatments at 900 °C by applying furnaces equipped with electrical heating, natural gas burner, and microwave plasma burner on the microstructure was investigated.
Public reference to this page dc.identifier.uri	https://opara.zih.tu-dresden.de/handle/123456789/2958
Public reference to this page dc.identifier.uri	https://doi.org/10.25532/OPARA-1577
Publisher dc.publisher	Technische Universität Bergakademie Freiberg
Licence dc.rights	CC0 1.0 Universal	en
URI of the licence text dc.rights.uri	http://creativecommons.org/publicdomain/zero/1.0/
Specification of the discipline(s) dc.subject.classification	4
Title of the dataset dc.title	GRK 2802: Anodes based on MgO-C Recyclates and 316L Steel for Prospective Aluminium Fused-Salt Electrolysis Application
Project abstract opara.project.description	A new generation of inert electrodes based on coarse and fine-grained MgO recyclates and Cr-Ni steel is being researched with the aid of image-forming extrusion at room temperature, sintering and targeted subsequent oxidation. To achieve sufficient electrical conductivity, the contribution of Ni/NiO/TiO2 additives as well as the interface design with SEM/FIB/EBSD is being investigated. Another promising variant for adjusting the electrical conductivity is the use of MgO-C recyclates and the addition of pre-synthesised or in-situ generation of MAX phases, e.g. based on Ti3AlC2, Ti2AlC or Ti3SiC2 during sintering firing. In addition to celluloses, the contributions of protein- and sugar-based excipients are also being investigated as binders, particularly in the MAX phase-based formulations. Coatings in the Al2O3/MgO/TiO2 system are applied using flame spraying technology to create a targeted oxidation passivation layer. Cyclic mercury pressure porosimetry, computed tomography images and HT-XRD will help to clarify the microstructure evolution as a function of the extrusion and sintering parameters.
Funding Acknowledgement opara.project.fundingAcknowledgement	This study was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), project number 461482547, within the Research Training Group “GRK 2802: Refractory Recycling: A contribution for raw material-, energy- and climateefficiency in high temperature processes”
Public project website(s) opara.project.publicReference	https://tu-freiberg.de/forschung/grk2802
Project title opara.project.title	GRK2802_P7_Metalloceramic composites made from MgO or MgO-C recyclates in combination with steel and other additives as inert or low-carbon anodes in aluminium fused-salt electrolysis