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Mechanochemical study of the hydriding properties of nanostructured Mg2Ni–Ni composites

Published online by Cambridge University Press:  01 November 2004

G. Mulas ,
L. Schiffini  and
G. Cocco
G. Mulas
Affiliation:
Dipartimento di Chimica, Università di Sassari, I-07100 Sassari, Italy
L. Schiffini
Affiliation:
Dipartimento di Chimica, Università di Sassari, I-07100 Sassari, Italy
G. Cocco*
Affiliation:
Dipartimento di Chimica, Università di Sassari, I-07100 Sassari, Italy
*
a)Address all correspondence to this author. e-mail: cocco@uniss.it
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Abstract

A comprehensive approach is presented for defining hydrogen activation and absorbing kinetics in heterogeneous Mg2Ni/Ni powder composites that were subjected to mechanical refinement. Hydriding tests were performed under conventional hydrogen dissolving and under reactive milling. Irrespective of the absorbing mode, the absorption kinetics is deceleratory throughout. Under conventional thermodynamic conditions, the hydriding rate depends strongly on the microstructural features of both the absorbing Mg2Ni intermetallic and the Ni phase. The latter plays an important role in the dissociative chemisorption of hydrogen. Under milling the hydrogen uptake and the hydriding kinetics also depend on the intensity of the milling processing, IM (watt g−1), with the absorption rate increasing exponentially with IM. The mechanical treatment was found effective even when thermodynamic absorption reached saturation level. Hydriding rates, mechanochemical gains, and instantaneous mechanochemical yields (mol J−1) were used to compare the processes on an absolute scale and to spotlight possible mechanisms controlling kinetics trends and absorbing features under milling.

Keywords

AbsorptionNanoscaleReactive ball milling
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 11 , November 2004 , pp. 3279 - 3289
Copyright
Copyright © Materials Research Society 2004

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