Effect of oxygen partial pressure on the formation mechanisms of complex Ca-rich ferrites

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dc.contributor.authorWebster, NASen_AU
dc.contributor.authorPownceby, MIen_AU
dc.contributor.authorMadsen, ICen_AU
dc.contributor.authorKimpton, JAen_AU
dc.date.accessioned2015-01-28T04:47:55Zen_AU
dc.date.available2015-01-28T04:47:55Zen_AU
dc.date.issued2013-01-01en_AU
dc.date.statistics2014-05-20en_AU
dc.description.abstractThe formation mechanisms of the complex Ca-rich ferrite iron ore sinter bonding phases SFCA and SFCA-I, during heating of a synthetic sinter mixture in the range 298-1623 K and at pO(2) = 0.21, 5 x 10(-3) and 1 x 10(-4) atm, were determined using in situ X-ray diffraction. SFCA and, in particular, SFCA-I are desirable bonding phases in iron ore sinter, and improved understanding of the effect of parameters such as pO(2) on their formation may lead to improved ability to maximise their formation. in industrial sintering processes. SFCA-I and SFCA were both observed to form at pO(2) = 0.21 and 5 x 10-3 atm, with the formation of SFCA-I preceding SFCA formation in each case, but via distinctly different mechanisms at each pO(2). No SFCA-I was observed at pO(2) = 1 x 10-4 atm; instead, a Ca-rich phase designated CFAlSi, formed at 1 420 K. By 1 456 K, CFAlsi had decomposed to form melt and a small amount of SFCA. Such a low pO(2) during heating of industrial sinter mixtures is, therefore, undesirable, since it would not result in the formation of an abundance of SFCA and SFCA-I bonding phases. In addition, CFA phase, which was determined by Webster et al. (Metall. Mater. Trans. B, 43(2012), 1344) to be a key precursor phase in the formation of SFCA at pO(2) = 5 x 10(-3) atm, was also observed to form at pO(2) = 0.21 and 1 x 10(-4) atm, with the amount decreasing with increasing pO(2). Copyright © The Iron and Steel Institute of Japan 2013.en_AU
dc.identifier.citationWebster, N. A. S., Pownceby, M. I., Madsen, I. C., & Kimpton, J. A. (2013). Effect of oxygen partial pressure on the formation mechanisms of complex Ca-rich ferrites. ISIJ International, 53(5), 774-781. doi:10.2355/isijinternational.53.774en_AU
dc.identifier.govdoc5083en_AU
dc.identifier.issn0915-1559en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitleISIJ Internationalen_AU
dc.identifier.pagination774-781en_AU
dc.identifier.urihttp://dx.doi.org/10.2355/isijinternational.53.774en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6123en_AU
dc.identifier.volume53en_AU
dc.language.isoenen_AU
dc.publisherThe Iron and Steel Institute of Japan Keidanren Kaikanen_AU
dc.subjectIron oresen_AU
dc.subjectSintered materialsen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectDecompositionen_AU
dc.subjectCrystal structureen_AU
dc.subjectNeutron diffractionen_AU
dc.titleEffect of oxygen partial pressure on the formation mechanisms of complex Ca-rich ferritesen_AU
dc.typeJournal Articleen_AU
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