Efecto de la reología de suspensiones de alumina para la fabricación de crisoles a partir de la técnica de colaje

Juan Fernando Hernández Ruiz; María Camila Corrales Agudelo; María Esperanza López Gómez

doi:10.17533/udea.rcm.342054

Authors

Juan Fernando Hernández Ruiz University of Antioquia
María Camila Corrales Agudelo University of Antioquia
María Esperanza López Gómez University of Oviedo

DOI:

https://doi.org/10.17533/udea.rcm.342054

Keywords:

suspensions, deflocculant, rheology, crucibles, sintering

Abstract

The crucibles were made using the casting technique, by using suspensions manufactured with alumina powders, which were characterized by scanning electron microscopy (SEM) and allowed to determine that a granulometric distribution d10 and d90 of 0.85 and 1.96 μm respectively, and that presented an irregular morphology. The chemical composition evaluated by X-ray fluorescence (XRF) was 99.81% (% by weight) of alumina Also it was found that the predominant crystalline phase is α-alumina and the remaining mostly corresponds to aluminum hydroxide as determined by by X-ray diffraction (XRD).

The suspensions were elaborated using a design of experiments 32, whose factors were the percentages of solids and deflocculant (mixture of polyacrylates, PA), from which the levels in which the suspension did not present adequate characteristics for the casting process were discarded. Subsequently, these samples were studied rheologically to see their thixotropy and/or reopexy coefficient, and thus associate it with their behavior in the casting to the gypsum mold. The suspensions with the best performance were analyzed to determine the storage and loss modules, thus verifying their stability. The crucibles were sintered at 1600°C for 3 h; the surface porosity and the internal porosity were measured to determine if they had a good sintering. The results indicate that the suspension with 80% solids and 0.1 of the polyacrylate mixture presented a higher thixotropy coefficient and a low porosity in the crucible cross section.

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Author Biographies

Juan Fernando Hernández Ruiz, University of Antioquia

Master's student in Materials Engineering, University of Antioquia. Medellín Colombia.

María Camila Corrales Agudelo, University of Antioquia

Materials Engineering Student, Universidad de Antioquia. Medellin Colombia.

María Esperanza López Gómez, University of Oviedo

PhD in Materials Science and Technology, University of Oviedo, Oviedo, Spain.

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