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Stress development of metal hydride composites for high density hydrogen storage applications

: Heubner, F.; Mauermann, S.; Kieback, B.; Röntzsch, L.


Journal of alloys and compounds 705 (2017), pp.176-182
ISSN: 0925-8388
Bundesministerium für Bildung und Forschung BMBF
Journal Article
Fraunhofer IFAM, Institutsteil Pulvermetallurgie und Verbundwerkstoffe Dresden ()

Strong mechanical forces can appear from gas absorbing solids if a volume expansion occurs during the chemical reaction. In particular for metal hydride reactors, the evolution of mechanical stresses on the reactor wall or internal assemblies over many hydrogen absorption/desorption cycles needs to be considered for reactor safety. In this work, we report on a recently developed in-situ measuring principle that allows the determination of mechanical stresses that originate from a metal hydride formation. For this purpose, a unique lab-scale reactor, equipped with a measuring cell, has been designed and tested with recently developed metal hydride composites (MHC). For spatially confined MHC we found that mechanical stresses were developed two and a half times higher than the hydrogen gas pressure applied for hydride formation.