Abstract

BARRIOS DE ARENAS, Irene  and  AM CHO, Seung. Efecto de la adición de ferrosilicio - FeSi₂ en la microestructura y estabilidad del titanato de aluminio- Al₂TiO₅. Rev. LatinAm. Metal. Mater. [online]. 2011, vol.31, n.1, pp.11-19. ISSN 0255-6952.

The Al₂TiO₅ formation and decomposition has been studied in equimolar mixtures of Al₂O₃ -TiO₂ powders, with 3-9 wt% industrial ferrosilicon additions as Al2TiO5 structural stabilizer. The microstructure evolution under the conditions: (a) solid state reaction sintering of Al₂O₃ and TiO₂ without and with FeSi₂ additions and (b) after 100 hours heat treatment at 1100ºC. They were analyzed by scanning electron microscopy (SEM) in backscattering electron mode imaging (BSEI). X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) techniques were used to determine structural phases and chemical composition respectively. The pattern sample, this means, without FeSi₂, showed aluminum titanate with unreacted TiO₂ and Al₂O₃ and the characteristic microcracking and micropores due to reactive sintering were observed. XRD patterns of samples with ferrosilicon evidenced the effect of this addition on the Al₂TiO₅ formation and a minor structural stabilizing effect on Al₂TiO₅ decomposition in the heat-treated samples

Keywords : Aluminum titanate; thermal stabilization; ferrosilicon; reactive sintering; backscattering electron mode imaging.