Mecanismos de desgaste en refractarios de colada continua asociados al efecto Marangoni

E. Brandaleze

doi:10.3989/revmetalm.2005.v41.iExtra.1012

Nozzle wear by Marangoni - Induced flow effect

Authors

E. Brandaleze Instituto Argentino de Siderurgia. Gerencia de Desarrollo - CNEA

DOI:

https://doi.org/10.3989/revmetalm.2005.v41.iExtra.1012

Keywords:

Continuous casting, Nozzle, Refractory, Marangoni effect, Wear

Abstract

Nozzle wear during continuous casting process is caused by physical and chemical reasons and also by refractory quality. A post mortem study on a sample of Al₂O₃ - graphite nozzle with a ZrO₂ insert allows to identify the present wear mechanisms. Different cyclic stages are carried out due to recurrent changes of interfacial tension and fluid convection. When the surface tension promote the refractory wetting by the steel, graphite of the nozzle surface is lost. Then, grains of ZrO₂ and of Al₂O₃ are dissolved by slag contact. This type of wear is associated with the Marangoni effect. Light and electronic microscopy was used to observe the refractory structure and by a cathodoluminiscence technique phases transformations under process conditions are determined.

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Published

2005-12-17

How to Cite

Brandaleze, E. (2005). Nozzle wear by Marangoni - Induced flow effect. Revista De Metalurgia, 41(Extra), 131–136. https://doi.org/10.3989/revmetalm.2005.v41.iExtra.1012

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Issue

Vol. 41 No. Extra (2005)

Section

Articles

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