Growth of Small Alumina Clusters during Ladle Deoxidation
2009 (English)In: High Temperature Materials and Processes, ISSN 0334-6455, Vol. 28, no 6, 347-368 p.Article in journal (Refereed) Published
For the first time, the size distribution of small clusters was determined in a systematic manner from samples taken during deoxidation with aluminium in an induction-stirred ladle. Chemical and microscopic analyses of samples were performed. The results indicated rapid cluster growth throughout the experiment and at the end of the experiment a majority of the small inclusions were found to be bound in clusters. The cluster growth was concluded to be by collision. Growth-model calculations were carried out to verify the experimental findings. In order to perform these calculations, a method first needed to be developed for conversion of the experimental data determined per unit area to data given per unit volume. Next, the cluster collision diameter was modelled using a theory for fractal aggregates. The results from the growth-model calculations, simulating deoxidation with aluminium, were found to agree well with the experimental results.
Place, publisher, year, edition, pages
2009. Vol. 28, no 6, 347-368 p.
Deoxidation, Alumina clusters, Growth, Collisions, Inclusions, Ladle
IdentifiersURN: urn:nbn:se:kth:diva-32679DOI: 10.1515/HTMP.2009.28.6.347ISI: 000279749700002ScopusID: 2-s2.0-77954720742OAI: oai:DiVA.org:kth-32679DiVA: diva2:411488
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