We report the development of new nanostructured MgH2 composites in which fluorine and TM catalyst... more We report the development of new nanostructured MgH2 composites in which fluorine and TM catalysts are introduced through the addition of TM fluorides such as FeF3. A fluorine transfer reaction then occurs to generate protective MgF2 plus Fe nanoparticles catalyst. The powders show sharply accelerated H-sorption kinetics at 300°C. H-sorption at rates acceptable for applications can be obtained at temperatures
... only slightly in the low temperature range due to the small entropy differences between the .... more ... only slightly in the low temperature range due to the small entropy differences between the ... V. DISCUSSION Our experimental results show that high intensity mechanical alloying of Ti-AI ... are very sensitive to gaseous impurities which strongly influence the phase stability in the Ti ...
A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides ... more A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides using high-energy ball milling and the use of suitable catalysts/additives. These new materials show fast or in case of Mg-based hydrides very fast absorption and desorption kinetics within minutes, thus qualifying lightweight Mg- or Al-based hydrides for storage applications. This article summarizes our current understanding of the kinetics of Mg-based light metal hydrides, describes an approach for a cost-effective processing technology and highlights some promising new developments in lightweight metal hydride research.
... Available online 19 January 2006. Abstract. ... [2] R. Schulz, S. Boily, L. Zaluski, A. Zalus... more ... Available online 19 January 2006. Abstract. ... [2] R. Schulz, S. Boily, L. Zaluski, A. Zaluska, P. Tessier and JO Stroem-Olsen, Innov Metal Mater (1995), p. 529. [3] W. Oelerich, T. Klassen and R. Bormann, J Alloys Compd 315 (2001), p. 237. ...
... very high storage capacities are composites with borohydrides, for example, MgH 2 + NaBH 4 ,M... more ... very high storage capacities are composites with borohydrides, for example, MgH 2 + NaBH 4 ,MgH 2 + LiBH 4 ... Because of the combination of low reaction enthalpies with theoretic reversible hydrogen ... of 5 K min −1 . The grey curve shows the first dehydrogenation upon heating ...
In conventional thermal spraying, the spray particles are partially or fully molten when they dep... more In conventional thermal spraying, the spray particles are partially or fully molten when they deposit on the substrate. Cold spraying, in contrast, uses less thermal and more kinetic energy. In this process, solid particles impact on the substrate at high velocities and form excellent coatings. Due to comparatively low temperatures and typically inert process gases, cold spraying is particularly suitable for heat and oxidation sensitive materials. In recent years, modeling and computational methods have been widely used to study this relatively new spraying process, particularly to describe impact conditions of particles, to improve nozzle design, and to provide a better understanding of the thermo-mechanical processes that lead to particle bonding and deposition. This paper summarizes the state of the art in these theoretical studies, alongside a comprehensive description of the process. The paper also discusses the prediction of coating properties in the light of modeling combined with experimental investigations.
Of all the materials presently being investigated to safely store high volumes of hydrogen for mo... more Of all the materials presently being investigated to safely store high volumes of hydrogen for mobile applications; magnesium remains the most attractive. Magnesium is a light, low cost metal with high capacity for hydrogen storage but its (de)hydriding kinetics have to be improved for practical applications. Recently, hydrogen kinetics in magnesium have been significantly improved by mechanically milling magnesium hydride
We report the development of new nanostructured MgH2 composites in which fluorine and TM catalyst... more We report the development of new nanostructured MgH2 composites in which fluorine and TM catalysts are introduced through the addition of TM fluorides such as FeF3. A fluorine transfer reaction then occurs to generate protective MgF2 plus Fe nanoparticles catalyst. The powders show sharply accelerated H-sorption kinetics at 300°C. H-sorption at rates acceptable for applications can be obtained at temperatures
... only slightly in the low temperature range due to the small entropy differences between the .... more ... only slightly in the low temperature range due to the small entropy differences between the ... V. DISCUSSION Our experimental results show that high intensity mechanical alloying of Ti-AI ... are very sensitive to gaseous impurities which strongly influence the phase stability in the Ti ...
A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides ... more A breakthrough in hydrogen storage technology was achieved by preparing nanocrystalline hydrides using high-energy ball milling and the use of suitable catalysts/additives. These new materials show fast or in case of Mg-based hydrides very fast absorption and desorption kinetics within minutes, thus qualifying lightweight Mg- or Al-based hydrides for storage applications. This article summarizes our current understanding of the kinetics of Mg-based light metal hydrides, describes an approach for a cost-effective processing technology and highlights some promising new developments in lightweight metal hydride research.
... Available online 19 January 2006. Abstract. ... [2] R. Schulz, S. Boily, L. Zaluski, A. Zalus... more ... Available online 19 January 2006. Abstract. ... [2] R. Schulz, S. Boily, L. Zaluski, A. Zaluska, P. Tessier and JO Stroem-Olsen, Innov Metal Mater (1995), p. 529. [3] W. Oelerich, T. Klassen and R. Bormann, J Alloys Compd 315 (2001), p. 237. ...
... very high storage capacities are composites with borohydrides, for example, MgH 2 + NaBH 4 ,M... more ... very high storage capacities are composites with borohydrides, for example, MgH 2 + NaBH 4 ,MgH 2 + LiBH 4 ... Because of the combination of low reaction enthalpies with theoretic reversible hydrogen ... of 5 K min −1 . The grey curve shows the first dehydrogenation upon heating ...
In conventional thermal spraying, the spray particles are partially or fully molten when they dep... more In conventional thermal spraying, the spray particles are partially or fully molten when they deposit on the substrate. Cold spraying, in contrast, uses less thermal and more kinetic energy. In this process, solid particles impact on the substrate at high velocities and form excellent coatings. Due to comparatively low temperatures and typically inert process gases, cold spraying is particularly suitable for heat and oxidation sensitive materials. In recent years, modeling and computational methods have been widely used to study this relatively new spraying process, particularly to describe impact conditions of particles, to improve nozzle design, and to provide a better understanding of the thermo-mechanical processes that lead to particle bonding and deposition. This paper summarizes the state of the art in these theoretical studies, alongside a comprehensive description of the process. The paper also discusses the prediction of coating properties in the light of modeling combined with experimental investigations.
Of all the materials presently being investigated to safely store high volumes of hydrogen for mo... more Of all the materials presently being investigated to safely store high volumes of hydrogen for mobile applications; magnesium remains the most attractive. Magnesium is a light, low cost metal with high capacity for hydrogen storage but its (de)hydriding kinetics have to be improved for practical applications. Recently, hydrogen kinetics in magnesium have been significantly improved by mechanically milling magnesium hydride
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