Desenvolvimento de compósitos com matriz de geopolímeros reforçados com partículas de quasicristais AlCuFe

Abstract

This paper intends to obtain a composite having a polymer matrix as inorganic-based materials with natural geological occurrence - silicates and aluminates, resistant to high temperatures, high initial resistance and curable at room temperature, called geopolymer. For the formulation of composite particles were added quasicrystalline alloy system Al-Cu-Fe. It discussed the method for obtaining of quasicrystals and the preparation of composites. The training phase icosaedral Al65, Fe11 3Cu 22.8, 9, by conventional fusion air, was accompanied by fluorescence spectroscopy x-ray (EFRX) to monitor the composition of the melt and thereby promote the levels Corrections components of the chemical elements combine to keep its nominal composition. Alloys, then processed, were subjected to heat treatment for homogenization and stabilization phase icosaedral. The microstructure control was conducted by x-ray diffraction (XRD) (KαCu = 1.5406 A) and scanning electron microscopy (SEM) before and after heat treatment. Geopolymer matrix composites with volume fractions of quasicrystalline alloy particles equal to 5, 10, and 17% were prepared. Also, we evaluated the influence of adding different amounts of water in the resistance of the composites. The geopolymer matrix composites were characterized structurally and mechanically and the analysis results by SEM indicate that there is good adhesion between the matrix and dispersed phase, and therefore the capability to produce the composite material studied. The results of mechanical tests showed that the composite best performance was the one with 5% by volume of quasicrystalline phase, without adding water.