DFG 465144480: Boron-free self-glazing Al₂O₃-C refractories
Type of the data | Dataset | |
Total size of the dataset | 4582433 | |
Author | Roungos, Vasileios | |
Author | Gehre, Patrick | |
Author | Salpagarov, Eldar | |
Author | Aneziris, Christos G. | |
Upload date | 2026-04-01T15:49:55Z | |
Publication date | 2026-04-01T15:49:55Z | |
Publication date | 2026-04-01 | |
Abstract of the dataset | Al₂O₃-C refractories are extensively used as functional components in the continuous casting of steel. These high-duty products such as submerged entry nozzles, ladle shrouds, and monoblock stoppers contain up to 30 wt.-% carbon and present excellent mechanical, thermal and chemical properties, enabling the cost- and quality-effective implementation of the continuous casting process. Ceramic glazes are externally applied on Al₂O₃-C flow control refractory products to protect carbon from oxidation. These glazes typically contain boron. However, the increasing requirements for clean steel technology along with environmental- and health issues associated with boron compounds will make the utilization of boron-free glazes a necessity in the upcoming years. New boron-free self-glazing Al₂O₃-C formulations with sodium carbonate, wollastonite and magnesia additives were developed with the assistance of the FactSage software tool. These compositions presented a softening point in the range of 1000-1100 °C for self-glaze formation, which is the typical preheating temperature range for Al₂O₃-C functional refractory products. In addition, the influence of particle packing on their oxidation resistance was investigated, based on established particle size distribution models. | |
Public reference to this page | https://opara.zih.tu-dresden.de/handle/123456789/2170 | |
Publisher | Technische Universität Bergakademie Freiberg | |
Specification of the discipline(s) | 4 | |
Title of the dataset | DFG 465144480: Boron-free self-glazing Al₂O₃-C refractories | |
Project abstract | The research project focuses on the investigation of environmentally friendly, boron-free protective glazes for carbon-bonded isostatically pressed refractory functional components and their action mechanisms. This includes the complete replacement of borax, a boron-containing additive used as a flux in low-melting-point glazes. Sodium tetraborate has been classified as a substance of very high concern since 2010, as it impairs fertility and is considered harmful to unborn children. The project aims to investigate the materials composition of carbon-bonded Al₂O₃-C as a function of CaO-MgO-Al₂O₃ and CaO-MgO-SiO₂ additives in combination with other key elements (e.g., P, K), which are capable of providing protective glaze compositions without environmentally harmful additives in the microstructure. The findings will be incorporated into the production of model functional components that can be used to investigate the formation of protective layers and their interaction (corrosion and oxidation resistance as well as clogging behavior) with liquid steel in a steel casting simulator. The mechanisms of protective layer formation will be investigated. Changes in mechanical properties will be modeled based on process variations (three different pressing regimes: a) without pulsation, b) with pulsation at the maximum isostatic pressure, and c) with pulsation at increasing pressure) and grain size distribution. Qualitative and quantitative EBSD analyses will allow for the interpretation of the results regarding the contribution of newly formed phases to protective layer formation. Furthermore, ASPEX measurements will be used to investigate the influence of the new protective glazes on the chemistry, size and population of non-metallic inclusions in the frozen steel melt. | |
Funding Acknowledgement | This study has been funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – project number: 465144480. | |
Project title | DFG 465144480 - Borfreie umweltfreundliche Schutzglasuren für kohlenstoffgebundene isostatisch gepresste feuerfeste Funktionalbauteile |