FeTi_(1.3)(Mm)_y合金的贮氢性能及其吸放氢机理研究  

STUDIES OF HYDROGEN STORAGE PROPERLIES AND ABSORPTION-DESORPTION MECHANISM OF FeTi1.3(Mm)y ALLOY

作　　者：马建新[1] 潘洪革[1] 王新华[1] 陈长聘[1] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027

出　　处：《金属学报》1999年第8期805-808,共4页Acta Metallurgica Sinica

基　　金：国家863计划高技术资助!715-010-011

摘　　要：系统研究了FeTi1．3（Mm）y（y=0，0．013，0．026，0．039，0．052）合金的贮氢性能,研究结果表明，在FeTi1．3合金中添加少量的富Ce混合稀土Mm可以显著改善合金的活化性能，使未经任何活化处理的合金在室温下经较短孕育期就能吸放氢.这主要是因为，在合金中分别以β-Ti和颗粒夹杂形式存在的过量的Ti和少量的Mm在氢化过程中首先与氢反应，伴随着的晶格膨胀导致合金中出现大量的显微裂纹，从而使合金的活化性能明显改善,FeTi1.3（Mm）y合金还具有较高的贮氢量，FeTi1.3（Mm）0．052合金在333K时的放氢量为177．8mL／g．The hydrogen storage properties of FeTi1.3(Mm)y(y=0, 0.013, 0.026, 0.039, 0.052) alloys have been studied in detail. The results show that the activation characteristic of FeTi1.3 alloy is improved dramaticany when a small amount of misch metal (Mm) is added. According to the XRD and SEM, the activation characteristic of the modified alloys is related to the cracks produced in the FeTi matrix by the volume expansion of β-Ti and Mm inclusions as a result of preferential hydrogenation. The activation characteristic is improved by providing chide-free surfaces through which hydrogen can be absorbed readily.The modified alloys not only can be activated at room temperature without any thermal treatment, but also have high hydrogen storage capacity, for example, the desorption content of FeTi1.3(Mm)0.052 alloy is 177.8 mL/g at 333 K.

关 键 词：贮氢合金 贮氢性能 活化性能 吸放氢机理 

分 类 号：TG139.7[一般工业技术—材料科学与工程]