Hydrogen absorption/desorption properties in the TiCrV based alloys

• Autor(a) principal: Martínez,A.
• Data de Publicação: 2012
• Outros Autores: Santos,D. S. dos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392012000500021
• topic: transition metal compound; hydrogen absorbing materials; crystal structure

Three different Ti-based alloys with bcc structure and Laves phase were studied. The TiCr1.1V0.9, TiCr1.1V0.45Nb0.45 and TiCr1.1V0.9 + 4%Zr7Ni10 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 TiCr1.1V0.9 alloy in a time of 9 minutes, 3.3 wt. (%) for TiCr1.1V0.45Nb0.45 alloy in a time of 7 minutes and 3.6 wt. (%) TiCr1.1V0.9 + 4%Zr7Ni10 with an increase of the hydrogen absorption kinetics attained in 2 minutes. This indicates that the addition of Nb and 4%Zr7Ni10 to the TiCrV alloy acts as catalysts to accelerate the hydrogen absorption kinetics.