Title: A study of slag-infiltrated magnesia-chromite refractories using hybrid microwave heating
Authors: Jones, Peter Tom ×
Vleugels, Jef
Volders, Ingo
Blanpain, Bart
Van der Biest, Omer
Wollants, Patrick #
Issue Date: Jun-2002
Publisher: Elsevier Science Publishers
Series Title: Journal of the European Ceramic Society vol:22 issue:6 pages:903-916
Abstract: Rebonded magnesia-chromite refractories are used in vacuum oxygen decarburisation ladles for the secondary refining of stainless steel. They suffer from acute wear due to the stringent chemical, thermal and mechanical conditions imposed. Although postmortem investigation of worn refractories is indispensable to study the degradation mechanisms, its application is often hampered by evaluation difficulties due to crystallisation phenomena occurring during in situ cooling. To study the actual microstructures at elevated temperatures, industrially worn and virgin refractory samples were reheated and quenched in a cylindrical single-mode microwave furnace. Usage of a tubular susceptor allowed reproducible hybrid heating of the samples up to 1800degreesC, The quenched samples were analysed with SEM and EPMA-EDS. Concurrently, elemental line scans, X-ray mappings and quantitative image analyses were performed. This allowed the description of the 'high-temperature inactivation' mechanisms of the secondary chromite bonding phase: dissolution (1) in the periclase phase and (2) in the liquid slag, with (2) being predominant. Conclusions are drawn with respect to the refractoriness of the contributors to the spines bonding phase: MgO.Cr2O3 (magnesiochromite) > MgO.Al2O3 (spinel)much greater thanMgO.Fe2O3 (magnesioferrite). Hybrid microwave heating is shown to be an interesting alternative for conventional furnace experiments on refractory samples. (C) 2002 Elsevier Science Ltd. All rights reserved.
ISSN: 0955-2219
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Chemical and Extractive Metallurgy Section (-)
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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