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Título del libro: Advances In Molten Slags, Fluxes, And Salts: Proceedings Of The 10th International Conference On Molten Slags, Fluxes And Salts 2016
Título del capítulo: Corrosion mechanisms in refractory castables by liquid oxides

Autores UNAM:

Autores externos:

Idioma:
Inglés
Año de publicación:
2016
Palabras clave:

Alumina; Atmospheric corrosion; Corrosion; Nondestructive examination; Refractory materials; Salts; Sintering; Chemical compositions; Commercial furnace; Corrosion mechanisms; Corrosion tests; Heating microscope; Hot modulus of ruptures; Non-destructive technique; Refractory castables; Slags


Resumen:

Corrosion in refractories in a commercial furnace is a very complex phenomenon which involves chemical and physical wear. In this work three refractory castables (A, B and C) are being characterized and studied to compare their properties and determine their corrosion mechanisms in the presence of slag obtained from a steel furnace. The chemical composition of the slag consists mainly of CaO, SiO2, alumina and Fe2O3. Using a heating microscope, it was determined that the slag starts to melt around 1350 °C. The chemical composition of the castables consist mainly of alumina (86%, 90% and 92% respectively) with a variation in material A which contains 5.8% MgO. Prismatic bars were made and sintered at 1400 C to run the hot modulus of rupture at 1000 C. A non-destructive technique was used to investigate the Young?s modulus of the specimens before and after sintering. The corrosion tests were performed at 1400 C in cubic crucibles (8×8 cm) with 50 g of slag. The investigated castable samples exhibited low values of Young?s Modulus and HMOR. The corrosion tests showed a high impact on the castables integrity, which can be seen in the multiple cracks and spalling formed after the test. © 2016 by The Minerals, Metals & Materials Society.


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