磁性蓄冷材料Er_3Ni的吸氢量研究  

STUDY ON THE HYDROGEN ABSORPTION CAPACITY OF MAGNETIC REGENERATIVE MATERIAL Er_3Ni

作　　者：金滔[1] 许斌[1] 李聪航[1] 汤珂[1] 陈立新[2] 陈国邦[1] 

机构地区：[1]浙江大学制冷与低温研究所,浙江杭州310027 [2]浙江大学金属材料研究所,浙江杭州310027

出　　处：《工程热物理学报》2011年第1期6-8,共3页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50776075)

摘　　要：磁性蓄冷材料Fr_3Ni在液氦温区的回热式低温制冷机中已经被广泛应用,在以He-H_2混合气体为工质的脉管制冷实验中发现Er_3Ni与H_2会发生反应,其产物在一定程度上提高了制冷机的性能。本文基于金属储氢过程的理论框架,分析了Er_3Ni吸氢的机理,并推算了Er_3Ni的理论吸氢量。对Er_3Ni在室温条件下的吸氢量进行了实验测量,结果显示Er_3Ni经活化后能与H_2充分反应,并生成氢化物Er_3NiH_8,与理论推算结果非常吻合。Magnetic material Er_3Ni is one of the common regenerative materials used in 4 K cryocoolers.The experiments on a pulse tube cryocooler with He-H_2 mixtures as working fluid and Er_3Ni as regenerative material demonstrated a significant improvement in refrigeration performance than the thermodynamic analytical results,which was attributed to the hydride Er_3NiH_x from Er_3Ni-H_2 reaction.The hydrogenation mechanism of Er_3Ni is analyzed,and the theoretical hydrogen absorption capability is also predicted.The measurement of the practical hydrogen absorption capability of activated Er_3Ni at ambient temperature shows that the hydride Er_3NiH_8 can be obtained from fully developed hydrogenation,which is coincident with the theoretical prediction.

关 键 词：Er_3Ni 吸氢机理 吸氢量 活化 

分 类 号：TB34[一般工业技术—材料科学与工程]