Development of Heat Storage Packed Beds Using Hydrogen Storage Alloy

研究了不同制备条件下铜微包覆镁镍合金致密体的热物理性能和循环强度。在准备契约时。铜含量（膜厚）的条件。加载压力。改变加载保持时间和压制方法，以评估其对导热系数/扩散系数和抗氢吸解吸循环强度的影响。与不含cu的致密材料相比，涂有cu的致密材料的导热系数显著增加：然而，非常显著的是，导热系数完全不依赖于致密材料的铜含量。由于颗粒之间接触面积的增加，压实的重载压力也增加了热扩散率。然而。压实体表现粘弹性行为，即。在固定的加载压力下，热扩散率需要1.8 ks才能达到恒定值。在氢吸收-解吸循环过程中，镀铜压块没有破裂。即使经过200次循环。而不含铜的电池在100次循环内很容易破裂。这些结果显示了低铜微胶囊化储氢合金致密材料实际应用的可能性。

Thermophysical properties and cycling strength of a compact of copper-microencapsulated magnesium-nickel alloy have been studied for differnent fabrication conditions. In Preparing the compact. the conditions of copper content (film thickness). loading pressure. loading hold time and pressing method were changed to assess their effect on thermal conductivity/diffusivity and strength against hydrogen absorption-desorption cycling. Thermal conductivity of the Cu-coated compact was shown to increase significantly compared with the Cu-free one : however, very significantly, thermal conductivity did not depend on copper content of the compact at all. Heavy loading pressure for compacting also increased thermal diffusivity due to an increase of contacted area among particles within the compact. However. the compact showed viscoelastic behavior : namely. it took as long as 1.8 ks until thermal diffusivity reached a constant value under a fixed loading pressure. Upon hydrogen absorption-desorption cycling the Cu-coated compacts did not crack. even after 200 cycles. while the Cu-free compacts broke easily within 100 cycles. These results show the possibility for the practical use of hydrogen storage alloy compacts with less copper microencapsulation.