GRK2802: Enhanced strength and high reactivity of Al2O3-MgAl2O4-C ceramic filters with in-situ β-SiC whiskers: Role of nano-Al2O3
References to related material | https://doi.org/10.1111/jace.70517 | |
Type of the data | Image | |
Type of the data | Text | |
Total size of the dataset | 46207357 | |
Author | Song, Jinwen | |
Author | Yan, Wen | |
Author | Volkova, Olena | |
Author | Cheng, Zhenyu | |
Author | Neubert, Lukas | |
Author | Angelini, Alberto | |
Author | Bellé, Matheus Roberto | |
Author | Li, Yuanbing | |
Upload date | 2026-04-27T14:58:18Z | |
Publication date | 2026-04-27T14:58:18Z | |
Publication date | 2026-04-27 | |
Abstract of the dataset | The role of nano-Al2O3 content on the phase composition, microstructure, mechanical properties, and purification performance for molten steel of Al2O3-MgAl2O4-C ceramic filters was investigated through XRD, SEM, EDS, as well as immersion test with molten steel. Results indicate that nano-Al2O3 firstly improves slurry retention performance, increases filter strut thickness, and ensures uniform distribution without cracks. Furthermore, during the sintering process, nano-Al2O3 accelerates the mass transfer (Mg2+ and Al3+) between microporous Al2O3-MgAl2O4 particle and nano-Al2O3 due to its high sintering reactivity, which promotes the development and growth of neck connections among the microporous Al2O3-MgAl2O4 particles, resulting in a substantial improvement in the mechanical properties. Regarding molten steel purification, on the one hand, its high reactivity significantly promoted the carbothermal reduction reaction, generating reductive gases that interact with and adsorb [Al], [O], and Al2O3 inclusions in the molten steel, quickly forming a continuous and uniform Al2O3-MgAl2O4 reaction layer at the interface. On the other hand, high mechanical strength also improves filter’s resistance to molten steel erosion and avoids contamination of the molten steel. Together, these two effects synergistically contribute to the purification of molten steel. The filter N5, with 5 wt% nano-Al2O3, not only exhibits excellent mechanical properties with a cold compressive strength of 1.41 MPa and 1.21 MPa after three thermal shock tests, but also demonstrates high purification efficiency, reducing inclusions by 44% and lowering the total oxygen content from 56.3 ppm to 26.1 ppm. Finally, the role of nano-Al2O3 in sintering behavior and purification function, as well as the comprehensive molten steel purification mechanism were proposed. | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/2243 | |
Publisher | Technische Universität Bergakademie Freiberg | |
Specification of the discipline(s) | 4::43 | |
Title of the dataset | GRK2802: Enhanced strength and high reactivity of Al2O3-MgAl2O4-C ceramic filters with in-situ β-SiC whiskers: Role of nano-Al2O3 | |
Project abstract | The focus of this project is to investigate the interaction of a Al-killed low-sulphur manganese-boron steel and a highly basic desulphurisation slag with MgO-C products based on recyclates and environmentally friendly binders. In order to determine the influence of thermophysical properties on the interaction with new refractory materials, the viscosity, surface tension and density of the liquid aluminium-killed steel in undesulphurised and desulphurised condition and the slags with high sulphur capacity are investigated as a function of [S], [B], (SiO2), (MgO), (S) and temperature. By finger testing a MgO-C product in the molten steel and slag, the refractory samples are obtained for further analysis of the interactions using optical microscopy and SEM/EDX. The (S)/[S] distribution between the MBW1500 steel and the slag is investigated in a crucible of MgO-C products based on recyclates in the MFG-40. The inclusion population of the steel samples after examination via Finger Testing is interpreted by chemical analysis and analysed by optical examination methods such as light microscopy combined with AFA (Automatic Feature Analysis) in P-SEM. The spinel formation between recycled MgO-C material and liquid steel is specifically studied in SEM/EDX microscopy. | |
Funding Acknowledgement | The dataset was generated within the framework of the Research Training Group GRK 2802 (project ID: 461482547) funded by the German Research Foundation (DFG). | |
Public project website(s) | https://tu-freiberg.de/en/research/grk2802 | |
Project title | GRK2802_Associated Member_Jinwen Song_P5_Research into the effect of MgO-C products based on recyclates and environmentally friendly binders on the sulphidic purity of the steels and the spinel formation |