Mechanical stresses originating from metal hydride composites during cyclic hydrogenation
Mechanical stresses originating from metal hydride composites during cyclic hydrogenation
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DOI：
10.1016/j.ijhydene.2015.06.053
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发表时间：
2015-08
影响因子：
7.2
通讯作者：
F. Heubner;C. Pohlmann;Sebastian Mauermann;B. Kieback;L. Röntzsch
中科院分区：
文献类型：
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作者：
F. Heubner;C. Pohlmann;Sebastian Mauermann;B. Kieback;L. Röntzsch
金属氢化物复合材料（MHC），它包括一个主要的吸氢相和第二相，如石墨，提供了非常高的体积存储密度和操作dynamics. There的广泛使用的金属氢化物粉末beds. In这里，我们报告的应力演化的限制MHC在吸氢和解吸过程中，这是由于在吸氢过程中的吸氢相的晶格膨胀。使用专门设计的测量元件原位记录氢化期间的应力发展。考虑了气体压力、温度和MHC几何形状对应力演化的影响。在这方面，所谓的pressure-stress-isothermal提出了第一次在热力学类比的压力成分等温线。
Metal hydride composites (MHC), which consist of a primary hydrogen absorbing phase and secondary phases such as graphite, offer very high volumetric storage densities and operation dynamics compared to widely used metal hydride powder beds.Here, we report on the stress evolution of confined MHC during hydrogen ab- and desorption which is due to the lattice expansion of the hydrogen absorbing phase during hydrogen uptake. The stress development during hydrogenation was recordedin situusing a specially designed measuring cell. Influences of gas pressure, temperature and MHC geometry on the stress evolution were considered. In this regard, so-calledpressure-stress-isothermsare proposed for the first time in thermomechanical analogy to pressure-composition-isotherms.