Cyclic Solid-Liquid Phase Transformations in the CaO – SiO 2 System—Experiments and Modelling

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The cyclic growth and shrinkage of solid oxides (i.e. wollastonite) in CaO–SiO2-based slags is investigated in-situ by means of High-Temperature Confocal Scanning Laser Microscopy (HT-CSLM). The compositions of the slags are carefully selected to induce different phase transformation conditions, i.e. congruent and incongruent melting/solidification. To complement the experimental results, the kinetics of growth and shrinkage of oxide crystals is investigated by means of a sharp interface model where the interfacial reaction and diffusion in the liquid bulk are considered as possible rate-controlling processes. The modelling approach combined with data analysis from key experiments reveals the underlying dissipative processes of solidification and melting phenomena, here, diffusion in the liquid bulk material and/or the interfacial reactions. The modelling approach is likely to be applicable for future materials design and processing problems from this perspective.
Seiten (von - bis)1555-1564
FachzeitschriftMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
PublikationsstatusVeröffentlicht - 19 Apr. 2023

Bibliographische Notiz

Funding Information:
The authors would like to express their gratitude to the Chair of Ferrous Metallurgy at Montanuniversitaet Leoben for providing the HT-CSLM equipment. The authors gratefully acknowledge the funding support of K1-MET GmbH, metallurgical competence center. The research programme of the K1-MET competence center is supported by COMET (Competence Center for Excellent Technologies), the Austrian programme for competence centers. COMET is funded by the Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology, the Federal Ministry for Labour and Economy, the Federal States of Upper Austria, Tyrol and Styria as well as the Styrian Business Promotion Agency (SFG) and the Standortagentur Tyrol. Furthermore, Upper Austrian Research continuously supports K1-MET. Beside the public funding from COMET, this research project is partially financed by the scientific partner Montanuniversitaet Leoben and the industrial partners Primetals Technologies Austria, RHI Magnesita, voestalpine Stahl, and voestalpine Stahl Donawitz.

Publisher Copyright:
© 2023, The Author(s).

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