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Zusätzliche Informationen

Lautsprecher
Rabkin E., Skripnyuk V., Estrin Y., Bendersky L., Magrez A., Carreño-Morelli E.
Name der Konferenz, Ort und Datum
Materials Research Society MRS Fall Meeting 2007, Boston, MA, USA von 26.11.2007 bis 30.11.2007
Kontakt
Carron Jean
Auszug

A Mg-based composite material containing 2 wt.% of multiwall carbon nanotubes (MWCNT) was synthesized by hot pressing of a mixture of Mg powder with MWCNT. In addition, the as-sintered composite was processed by one or two passes of equal channel angular pressing (ECAP). The hydrogen storage properties of the prepared materials were determined by volumetric method and compared with those of pure Mg. It was found that addition of MWCNT to Mg eliminates the pressure hysteresis and increases the slope of the pressure plateau in the "pressure-composition" isotherms measured at 573 K. The kinetics of hydrogen desorption is also significantly enhanced. The hydrogen desorption pressure in the middle of plateau region for the as-sintered composite is by about 50% higher than that for pure Mg. Surprisingly, ECAP processing of the as-sintered composite lowers hydrogen desorption pressure, although it still remains higher than for pure Mg. This is in contrast with the results of previous studies in which it was shown that ECAP processing of Mg-based alloys increases hydrogen desorption pressure. Transmission electron microscopy observations of the ECAP processed composite indicate that the changes in morphology of Mg-MWCNT interface upon ECAP may be responsible for the deterioration of hydrogenation properties.