University of Oulu

Francis Gyakwaa, Matti Aula, Tuomas Alatarvas, Tero Vuolio, Marko Huttula, Timo Fabritius, Applicability of Time-Gated Raman Spectroscopy in the Characterisation of Calcium-Aluminate Inclusions, ISIJ International, 2019, Volume 59, Issue 10, Pages 1846-1852, Released October 17, 2019, [Advance publication] Released July 23, 2019, Online ISSN 1347-5460, Print ISSN 0915-1559,

Applicability of time-gated Raman spectroscopy in the characterisation of calcium-aluminate inclusions

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Author: Gyakwaa, Francis1; Aula, Matti1; Alatarvas, Tuomas1;
Organizations: 1Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI–90014, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: Iron and Steel Institute of Japan, 2019
Publish Date: 2019-12-16


Calcium aluminate (CaO–Al₂O₃) phases play a critical role in the study of non-metallic inclusions in aluminium killed, and calcium treated steels. In this study, the Raman spectroscopy technique, a versatile and non-destructive approach, was used to characterise binary calcium aluminate phases qualitatively and quantitatively. Calcium aluminate samples with varying CaO/Al₂O₃ ratios were synthesised to produce a binary phase samples mixture of C12A7–C3A and C12A7–CA. Quantitative estimation was based on plotting a linear regression calibration model between the ratio of Raman band intensities and the phase fraction in the samples. With the linear regression, the phase fraction of C12A7–C3A and C12A7–CA was estimated with average absolute errors of 2.97 and 2.55 percentage points. This work demonstrates the potential suitability of using Raman spectroscopy technique for evaluating whether calcium aluminate phases in oxide inclusions fall within the liquidus region at steelmaking temperatures.

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Series: ISIJ international
ISSN: 0915-1559
ISSN-E: 1347-5460
ISSN-L: 0915-1559
Volume: 59
Issue: 10
Pages: 1846 - 1852
DOI: 10.2355/isijinternational.ISIJINT-2019-122
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Copyright information: © 2019 by The Iron and Steel Institute of Japan. Published in this repository with the kind permission of the publisher.