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

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Abstract

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.
Original languageEnglish
Pages (from-to)1555-1564
Number of pages10
JournalMetallurgical and materials transactions. B, Process metallurgy and materials processing science
Volume54.2023
Issue numberJune
DOIs
Publication statusPublished - 19 Apr 2023

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

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