Mariea Deaconu, Ion ciuca, Tiberiu Meleg, Alice Dinu, Maria Mihalache<br>Study on Hydrogen Absorption Properties of U-55ZR Alloy

Mariea Deaconu, Ion ciuca, Tiberiu Meleg, Alice Dinu, Maria Mihalache
Study on Hydrogen Absorption Properties of U-55ZR Alloy

Abstract:

The development of materials with high hydrogen storage capacity is one of the key issues for practical applications in hydrogen energy systems. The uranium-zirconium alloy is a promising material for hydrogen storage. In order to develop new hydrogen storage materials, hydrogen absorption properties of zirconium-rich alloy of 55 wt.%Zr (U-55Zr) were examined at temperatures from 350 to 600°C and at a hydrogen pressure slightly lower than one atmosphere. Hydrogen-absorption isotherms were measured at 350, 400, 500 and 600°C. The hydrogen absorption measurements have been made on four alloy specimens in a SETARAM SETSYS EVOLUTION 24 thermo balances by thermo-gravimetric (TG) analysis. The U-55Zr alloy was prepared from the constituent elements by powder metallurgy using depleted uranium and sponge zirconium and studied in as cast condition as hydrogen storage material. Microstructure investigations were conducted for the starting alloy specimens and hydrogenated specimens using a scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). Crystal structures of the specimens were also analyzed with X-ray diffraction technique. The hydrogen capacity of U-55Zr alloy was determined by weighing the samples prior to and after the hydrogenation process. The kinetic of hydrogen absorption related to the hydride composition was analysed and discussed. Keywords: hydrides, hydrogen storage, U- alloys, kinetics

Issue: 2016, Volume 67, Issue 6

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