Absorption and desorption properties of the Mg + X wt.%TiFe composite, X = 2.5 and 40, manufactured by high-energy ball milling

Abstract

This work compares the absorption and desorption properties of the Mg + TiFe composite with additions of 2.5 and 40 wt. % TiFe. The composite was produced by high-energy ball milling during 36 h at 600 rpm under purified argon atmosphere. The TiFe was previously milled in ethanol absolute to refine the particle size. The composites materials were characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM). The kinetics of hydrogen absorption and desorption were evaluated by differential scanning calorimetry (DSC) and by a Sievert´s type apparatus. For both evaluated compositions, the main results revealed that it was possible absorb H2 at room temperature. Even a few TiFe content (2.5 wt. %) was enough to obtain kinetic improvements. The TiFe had an important role in the kinects of H2 absorption of Mg in a broad range of temperatures, including room temperature.