FOR 3010: Thermal Expansion of Electrofused MgO-Based Spinel Systems Containing Fe2O3, Al2O3-Fe2O3, Al2O3-Cr2O3-Fe2O3 and Al2O3-NiO-Fe2O3
Contributing person | Fischer, Undine (enter data, upload to archive) | |
Type of the data | Collection | |
Total size of the dataset | 112718754 | |
Author | Zienert, Tilo | |
Author | Borges, Otavio H. | |
Author | Pandolfelli, Victor C. | |
Author | Aneziris, Christos C. | |
Upload date | 2026-10-27T10:20:25Z | |
Publication date | 2026-10-27T10:20:25Z | |
Data of data creation | 2026-10-23 | |
Publication date | 2026-10-27 | |
Abstract of the dataset | Magnesia-spinel multicomponent materials have been used as refractories for a long time. In addition to a few binary systems, the influence of spinel phases on the thermal expansion (α) of MgO or the resulting compound has not been studied so far. As α is critical for refractories in application, this work investigates the thermal expansion of complex MgO-based spinel systems using X-ray diffraction (XRD) in combination with Rietveld refinement in the temperature range between 30 °C and 1200 °C. All studied periclase solid solutions, in contact with spinels of the systems Mg1.01(Al0.23Cr1.64Fe0.13)O4, Fe3O4–MgFe2O4, NiFe2O4–NiAl2O4, MgAl2O4–MgFe2O4, Fe3O4–FeAl2O4 and Fe3O4 · NiFe2O4 ·2 MgAl2O4 showed α trends below plain MgO, or even decreasing values above 1000 °C. Many spinels showed large negative thermal expansion coefficients. It was found that the structural change in spinels is constrained, leading to a common analytical expression to calculate the lattice parameter of spinels with temperature, which was used to study the nature of the investigated spinels in more detail. The work highlights that Cr-free MgO-spinel systems show similar or even better high-temperature behaviour than commonly used magnesia–chrome aggregates. | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/3024 | |
Publisher | Technische Universität Bergakademie Freiberg | |
Specification of the discipline(s) | 4::43::405::405-05 | |
Title of the dataset | FOR 3010: Thermal Expansion of Electrofused MgO-Based Spinel Systems Containing Fe2O3, Al2O3-Fe2O3, Al2O3-Cr2O3-Fe2O3 and Al2O3-NiO-Fe2O3 | |
Project abstract | The focus of the project is the investigation of the pre-synthesis of functional grains for the manufacturing of “Refractory Composites”. The pre-synthesis of the grains takes place with the aid of different manufacturing routes and sintering conditions, which influence the particle geometry of the grain (polyhedral via crushed grains, spherical via alginate route, adjustable shape via 3D-printing), the surface morphology and chemistry as well as the generated grainsize distribution as a function of the ceramic and metallic parts. A complete new approach is dealing with the investigation of the electrical assisted wettability in a special heating microscope of sandwich components based on coarse grained core/shell structures of the project 2 as well as fine grained structures based on 3D-printed components of project 1. By applying a voltage with the aid of Pt-electrodes the three wetting stages will be investigated. | |
Funding Acknowledgement | The dataset was generated within the framwork of the Research Unit FOR 3010 (project ID: 416817512) funded by ther German Research Foundation (DFG). | |
Public project website(s) | https://tu-freiberg.de/en/research/for3010 | |
Public project website(s) | https://gepris.dfg.de/project/433714497 | |
Project title | FOR 3010_SP1 - Pre-synthesis of functional grains for manufacturing of ‘Refractory Composites’ |