MgNi非晶合金的制备及电极性能的研究

用机械合金化的方法研究了MgNi非晶相的形成效率、合成物相组成和相结构的演变以及电极性能与机械球磨工艺的依赖关系。模拟电池法测量Mg-Ni合成物的电极性能，发现放电容量的大小与非晶相的形成效率成正比，球磨50～60h的MgNi非晶具有最大的放电容量，继续延长球磨时间导致放电容量下降。基于MgNi非晶相形成过程的相组成和相结构，探讨了合成物电极性能的变化规律。

The Effect of the Ball- milling Parameters on the Formation of Phase, Structure and Electrode Properties of MgNi Amorphous Alloys

The dependence of the formation of phase, structure and electrode properties of MgNi amorphous alloys on the ball milling parameters was investigated by mechanical alloying. XRD shows that revolution per minute has fairly important influence to formation rate of MgNi amorphous single phase, and also the mass ratio of the steel balls and elemental powders, as well as the ball selection in diameters has strong effect in the initial milling-process, but little effect on the formation of the end-product. Thermal analysis (DSC, DTA and TG) confirms that the two-step crystallization transition and weight-increased due to oxidation at about 800K occur in all MgNi amorphous alloys synthesized by various ball-milling parameters. The electrode properties of synthetic samples were measured by simulation battery test. It was found that the discharge capacity increases monotonically with the increase of MgNi amorphous phase in samples, the maximum of which reaching for the samples obtained by 50 to 60 hours of milling, but reducing again after prolonging ball-milling. Based on the phase component and phase structure of the samples, the change in electrode properties is discussed.