Investigation of Alumina Wetting by Fe-Ti, Fe-P and Fe-Ti-P Alloys

The wetting of alumina substrates by Fe-Ti, Fe-P and Fe-Ti-P alloys has been investigated using sessile drop experiments conducted under an inert gas atmosphere in the temperature range of 1550 to 1620°C. The surface and interfacial structures have been explored by scanning electron microscopy and e...

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Bibliographic Details
Published in:Journal of adhesion science and technology Vol. 26; no. 8-9; pp. 1141 - 1156
Main Authors: Karasangabo, Augustin, Bernhard, Christian
Format: Journal Article
Language:English
Published: Utrecht Routledge 01.05.2012
Taylor & Francis Ltd
Subjects:
Adhesion
Agglomeration
Alloy steels
Alloy systems
Alloying additive
Alloying elements
Alloys
Alumina
Aluminum oxide
Binary systems
Ceramics
clogging
Contact angle
Continuous casting
drop shape analysis
Energy dispersive X ray spectroscopy
Ferrous alloys
Iron and steel making
Melts
non-metallic inclusions
Nozzles
Partial pressure
Particle physics
Rare gases
sessile drop
Substrates
Titanium base alloys
Wettability
Wetting
ISSN:0169-4243, 1568-5616
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Summary:The wetting of alumina substrates by Fe-Ti, Fe-P and Fe-Ti-P alloys has been investigated using sessile drop experiments conducted under an inert gas atmosphere in the temperature range of 1550 to 1620°C. The surface and interfacial structures have been explored by scanning electron microscopy and energy dispersive X-ray spectroscopy. Substantial additions of titanium are known to induce steel melts to wet alumina due to the formation of a Ti-rich reaction product at the alloy/ceramic interface, but the present work has shown that even low Ti concentrations can induce a reactive wetting process leading to an improvement of the wettability of alumina by Fe alloys. The contact angle of molten steel containing phosphorus on alumina decreased with increasing P content. The improvement of the wetting behaviour in this system was attributed solely to the adsorption of P onto the surface of the Fe melt. The addition of P as a ternary alloying element to the system Fe-Ti proved to be beneficial to the wetting behaviour. The measured contact angles were much lower than those in the binary systems Fe-Ti and Fe-P. This effect was related to the fact that P enhances the activity of Ti in the Fe melt. According to experimental observations, it turns out that the wettability of liquid Fe-based alloys, when an Al2O3 surface is present, is not only a property of the metal/oxide couple but is also dependent on the oxygen partial pressure, whereas temperature variations bring about a comparatively small effect. This work is of interest in understanding the phenomena pertaining to inclusion engineering and steel- refractory interactions, such as the clogging of submerged entry nozzles by agglomerated alumina particles during the continuous casting process.
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ISSN:0169-4243
1568-5616
DOI:10.1163/016942411X580252