Hydrogen absorption/desorption properties in the TiCrV based alloys

Abstract

Three different Ti-based alloys with bcc structure and Laves phase were studied. The TiCr 1.1V 0.9, TiCr 1.1V 0.45Nb 0.45 and TiCr 1.1V 0.9 + 4%Zr 7Ni 10 alloys were melted in arc furnace under argon atmosphere. The hydrogen absorption capacity was measured by using aparatus type Sievert's. Crystal structures, and the lattice parameters were determined by using X-ray diffraction, XRD. Microestructural analysis was performed by scanning electron microscope, SEM and electron dispersive X-ray, EDS. The hydrogen storage capacity attained a value of 3.6 wt. (%) for TiCr 1.1V 0.9 alloy in a time of 9 minutes, 3.3 wt. (%) for TiCr 1.1V 0.45Nb 0.45 alloy in a time of 7 minutes and 3.6 wt. (%) TiCr 1.1V 0.9 + 4%Zr 7Ni 10 with an increase of the hydrogen absorption kinetics attained in 2 minutes. This indicates that the addition of Nb and 4%Zr 7Ni 10 to the TiCrV alloy acts as catalysts to accelerate the hydrogen absorption kinetics.