论文部分内容阅读
采用气体雾化法制备了新型ＲＥ（ＮｉＡｌＣｕ） ｘ（ｘ＝ ４ ．５，４ ．９，５ ．６） 微晶贮氢合金粉末，并进行了微观结构、热力学及电化学性能研究。合金颗粒呈较为规则的球形，ｘ＝ ４．５ 时，微观结构由基体ＡＢ５ 相及沿相界分布的ＡＢ３ 与ＡＢ 共晶相复合结构组成；ｘ＝ ４ ．９ 时，微观结构由基体ＡＢ５ 相及少量呈不连续网状分布的ＡＢ相复合结构组成；ｘ＝ ５．６ 时，微观结构由基体ＡＢ５ 相及沿相界分布的ＡＢ５ 与Ｎｉ３Ａｌ 共晶相复合结构组成。合金的电化学容量为２１０ ～３００ｍＡｈ·ｇ－１ ，活化次数为１ ～３ 次。其活化是由于吸氢前后内在双相复合结构促使合金颗粒沿相界产生淬火显微裂纹，并在吸放氢过程中逐渐扩展，颗粒内部露出大量新鲜反应界面所致。
A novel RE (NiAlCu) x (x = 4.5, 4.9, 9.5) microcrystalline hydrogen storage alloy powder was prepared by gas atomization method, and the microstructure, thermodynamics and electrochemical properties were studied. The microstructure of the microstructure consists of the matrix AB5 and the AB3 and AB eutectic phases along the phase boundary. X = 4. At 9 o’clock, the microstructure consisted of matrix AB5 and a small amount of AB phase composite structure with discontinuous network distribution. When x = 5.6, the microstructure was composed of matrix AB5 and AB5 along the phase boundary and Ni3Al eutectic phase Structure and composition. The electrochemical capacity of the alloy is 210 ~ 300mAh · g-1, the activation frequency is 1 ~ 3 times. The activation is due to the internal double-phase composite structure before and after hydrogen absorption to promote the alloy particles along the phase boundary quenching micro-cracks, and gradually expand during the process of hydrogen absorption and absorption, the particle exposed a large number of fresh reaction interface.