纳米AlNi金属间化合物的结构及其吸放氢行为

Phase Structure and Hydrogen Absorbing-Desorbing Behaviour of Single-Phase Nanocrystalline Intermetallic Compound AlNi

摘要: 采用自悬浮定向流法制备AlNi纳米微粉。应用TEM、XRD和元素化学分析等检测手段对微粒材料的显微结构、相组成和成分构成进行了表征。结果表明，所制备的纳米颗粒为单相的AlNi，TEM形貌呈较规则的多边形，粒径分布范围为10～40 nm。氢吸附实验表明：在3.43 MPa氢压下，AlNi纳米微粉在90～100 ℃时有一释放氢过程，200 ℃时达到最大吸氢量，约为7.3%。

Abstract: Nanocrystalline intermetallic compound AlNi powder was synthesized by flow-levitation method. The morphologies, granularities and phase structures of particles were investigated by TEM and XRD techniques. The analysis results indicate that the powder is composed of single-phase intermetallic compound AlNi, and the grain size of the nanocrystalline intermetallic compound AlNi particulate is 10-40 nm. The measurements of the hydrogen storage properties for the AlNi powder were carried out, and the results show that the first hydrogen desorbing behaviour of AlNi is established at 3.43 MPa and 90-100 ℃, and the single phase nanocrystalline intermetallic compound AlNi has its maximum capacity about 7.3% at 200 ℃.