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Issues »  Volume 39, Issue 11

Influence of Admixtures of Si, Fe, Ti on Temperature and Kinetics of Dissociation of MgH2 Obtained by Reactive Mechanical Alloyage

O. G. Ershova, V. D. Dobrovolsky, Yu. M. Solonin, O. Yu. Koval

I. M. Frantsevich Institute for Problems in Materials Science, NAS of Ukraine, 3 Academician Krzhyzhanovsky Str., UA-03142 Kyiv, Ukraine

Received: 28.08.2017. Download: PDF

The mechanical alloy MА (Mg + 5% wt. Si + 5% wt. Fe + 2% wt. Ti) is synthesized by the method of reactive mechanical alloyage (RMA). At hydrogen pressure of 0.1 MPa, the hydrogen capacity, thermal stability, and kinetics of hydrogen desorption from the MgH2 hydride phase obtained by means of the MA are studied with the use of thermal desorption spectroscopy. As determined, the addition of Si, Ti, and Fe to magnesium leads to a significant improvement in the kinetics of hydrogen desorption from the MgH2 hydride phase obtained by RMA. Due to this alloying, the decrease in the thermodynamical stability of MgH2 is not revealed. Hydrogen capacity of MА after reactive grinding for 20 hours is found to be equal to 5.6% wt. and after the first cycles of hydrogen sorption–desorption—to 5.1% wt.

Key words: sorption–desorption kinetics, hydrogen-sorption properties, mechanical alloy, thermal stability, thermodesorption spectroscopy.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i11/1557.html

DOI: https://doi.org/10.15407/mfint.39.11.1557

PACS: 61.72.Ff, 61.72.S-, 68.43.Mn, 68.43.Nr, 81.07.Bc, 81.20.Ev, 81.20.Wk, 88.30.rd

Citation: O. G. Ershova, V. D. Dobrovolsky, Yu. M. Solonin, and O. Yu. Koval, Influence of Admixtures of Si, Fe, Ti on Temperature and Kinetics of Dissociation of MgH2 Obtained by Reactive Mechanical Alloyage, Metallofiz. Noveishie Tekhnol., 39, No. 11: 1557—1571 (2017) (in Ukrainian)

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