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Journal of Nanomaterials
Volume 2015 (2015), Article ID 418585, 6 pages
http://dx.doi.org/10.1155/2015/418585
Research Article

Influence of Milling Conditions on the Hydriding Properties of Mg-C Nanocomposites

1Faculty of Chemistry and Pharmacy, University of Sofia “St. Kliment Ohridski”, 1 James Bourchier Street, 1164 Sofia, Bulgaria
2Interuniversity Micro-Electronics Center at Leuven, IMEC, 3001 Leuven, Belgium

Received 23 December 2014; Accepted 17 January 2015

Academic Editor: Antonios Kelarakis

Copyright © 2015 Hristina Stoyadinova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mg75 at.%, CB25 at.% (CB: carbon black) composites were synthesized at different ball milling conditions (milling energy, milling duration, and environment) and their hydriding properties were characterized by high-pressure DSC. The SEM observations revealed that the samples consist of 5–15 μm Mg particles, surrounded and in some cases coated by carbon particles. X-ray diffraction analysis showed that the Mg phase of all as-obtained composite powders is nanocrystalline with average crystallite size in the range 20–30 nm, depending on the milling conditions. The best hydriding properties, expressed in low-temperature hydriding (below 150°C) and improved cycle life, showed the composites milled at dry conditions. This is obviously due mainly to the successful Mg surface protection by the carbon. Additional decrease of the hydriding temperature (<100°C) was achieved applying higher-energy milling, but at the same time the cycling stability deteriorated, due to the extremely fine particles and microstructure achieved under these conditions. The composites milled in the presence of heptane showed rapid capacity decline during cycling as well. The observed difference in the hydriding behavior of the Mg-CB composites is attributed to the different coating efficiency of the carbon milled under different conditions with Mg, which is supposed to protect magnesium from oxidation and plays a catalytic role for the hydriding reaction.