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Wettability of Al2O3, MgO and Ti2O3 by Liquid Iron and Steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.ORCID iD: 0000-0003-4107-8405
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
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2015 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 55, no 9, 1882-1890 p.Article in journal (Refereed) Published
Abstract [en]

The wetting behavior of liquid iron and steel on Al2O3, MgO and Ti2O3 substrates was measured by using the sessile drop method. Measurements were carried out using a controlled oxygen partial pressure and using an argon protected atmosphere. For the Al2O3 and MgO substrates, reaction layers in form of FeAl2O4 and MgO-FeO (solid solution) were formed. These layers slightly decreased the contact angle and surface tension values after a full melting. For a Ti2O3 substrate in contact with pure Fe, no-reaction could be observed at the interface. Furthermore, the contact angle and surface tension values were almost stable after a full melting. For a Ti2O3 substrate in contact with steel, the contact angle and surface tension values decreased steeply after a full melting, due to the formation Al2TiO5 reaction layer formation at the interface.

Place, publisher, year, edition, pages
2015. Vol. 55, no 9, 1882-1890 p.
Keyword [en]
contact angle, Al2O3, MgO, Ti2O3, reaction layer
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-175952DOI: 10.2355/isijinternational.ISIJINT-2014-820ISI: 000362154800012Scopus ID: 2-s2.0-84943192537OAI: oai:DiVA.org:kth-175952DiVA: diva2:866207
Note

QC 20151102

Available from: 2015-11-02 Created: 2015-10-26 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Wettability and Agglomeration Characteristics of Non-Metallic Inclusions
Open this publication in new window or tab >>Wettability and Agglomeration Characteristics of Non-Metallic Inclusions
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, both the wettability and the agglomeration characteristics of non-metallic inclusions in liquid iron/steel were studied by using both experimental results and thermodynamic considerations. The mechanisms of the wettability of different types of inclusions were discussed. Also, the agglomeration behaviors of the inclusions were analyzed.

Firstly, the wettability of different types of inclusions (including Al2O3, MgO, Ti2O3, TiO2 and TiN) in contact with the liquid iron/steel was studied. For the TiNcase, there is no reaction formation at the interface between TiN and pureiron/steel. In the caseo f pure Fe, the oxygen increase is the main factor for a contact angle decrease. As for the steel case, a sharp decrease of the contact angle is due to the effects of both an increased oxygen content in the liquid steel and a formation of a Ti(N,C,O) phase at the interface. For the Al2O3 and MgO cases, the formation of a FeAl2O4 and a MgO-FeO reaction layer at the interface, respectively, lead to a contact angle decrease. In the case of the Ti2O3/pure Fe case, the reaction at the interface cannot be identified. For the Ti2O3/steel case, the formation of an Al2TiO5 reaction layer is the main reason for a steep decrease of the contact angle. In the TiO2 case, the melting region appears at the temperature below the melting point of pure iron. This is due to the strong formation of a solid solution TiOx-FeO. The main source of the oxygen for the solid solution formationis due to a TiO2 substrate decomposition and a low partial pressure of oxygen in the chamber.

Regarding to the non-metallic particle additions (TiO2 and TiN) into the molten steel, the steel composition should be controlled to have a small Al content (<0.005mass%) and a high Ti content (>0.035mass%), so as togeta high number of Ti-rich oxide inclusions with a small size. This conclusionis supported from the view point of the van der Waals force, liquid-capillary force and wettability.

Regarding the Ti/Al complex deoxidation in the melt, the “mainly occupied clustered inclusions” with spherical shape is due to a TiOx-FeO liquid inclusion precipitation after an addition of Ti as a pre-deoxidizer. The much lower cluster number in the Ti/Al case than that in the Al case is mainly due to a coagulation of single TiOx-FeO liquid inclusions. Also, the cluster formation in a complex Ti/Al deoxidation is started after an Al addition rather than after a Ti addition.

Regarding the Al2O3 cluster formation in deoxidation, the cavity bridge forceis larger than the van der Waals force. However, the difference between them is smaller than 7 times. In the reoxidation process, the influence of the cavity bridge force due to the wettability decreased, and became similar to that of the liquid-capillary force.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. x, 66 p.
Keyword
wettability, non-metallic inclusion, agglomeration mechanism, attraction force, complex deoxidation, particle addition
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-183069 (URN)978-91-7595-867-5 (ISBN)
Public defence
2016-03-30, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (English)
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Note

QC 20160301

Available from: 2016-03-01 Created: 2016-02-26 Last updated: 2017-02-28Bibliographically approved

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