HYDROGEN ABSORPTION IN A-Co30Fe55B15

0468053 - ÚFM 2017 RIV CZ eng C - Conference Paper (international conference)
Čermák, Jiří - Král, Lubomír - Roupcová, Pavla
HYDROGEN ABSORPTION IN A-Co30Fe55B15.
METAL 2016: 25th International Conference on Metallurgy and Materials. Ostrava: Tanger Ltd., 2016, s. 1368-1373. ISBN 978-80-87294-67-3.
[METAL 2016 - Anniversary International Conference on Metallurgy and Materials /25./. Brno (CZ), 25.05.2016-27.05.2016]
R&D Projects: GA MŠMT(CZ) LQ1601
Institutional support: RVO:68081723
Keywords : absorption, Co 30 Fe 55 B 15 * Hydrogen * Co30Fe55B15
Subject RIV: BJ - Thermodynamics

Hydrogen solved in amorphous alloys (AAs) influences their magnetic characteristics. AAs are also perspective
as additives that can improve hydrogen storage kinetic in certain types of ball-milled hydrogen storage
materials (HSMs). Therefore, knowledge of hydrogen solubility and hydrogen sorption kinetics in AAs are of a
great importance for aimed design both AAs with optimal magnetic parameters and HSMs with desired sorption
characteristics. In the present paper, amorphous alloy Co30Fe55B15 (an example of the type a-TM1xTM2y Bz ;
TM - transition metal) was investigated. Hydrogen concentration c H was measured by Sieverts method in
temperature interval from T = 150 °C to T = 350 °C under hydrogen pressure p up to 6 MPa. It was found that
c H was an increasing function of p and its maximum value was typically 0.5 wt.% H2 at 350 °C and 6 MPa.
However, when the alloy was preliminary hydrogen charged (PHC), the pressure dependence of total c Htot in
the first absorption cycle(s) is non-monotonous in dependence on PHC conditions. For the sake of comparison,
the same absorption characteristics were measured also in Mg2Ni intermetallic that is a common constituent
in Mg-based HSMs. Comparing Co30Fe55B15 and Mg2Ni, it was concluded that Co30Fe55B15 shows lower
hydrogen solubility, but much better absorption kinetics.
Permanent Link: http://hdl.handle.net/11104/0266066