不同制备工艺下掺杂Ce、Ti氢化物对Mg2Ni合金储氢循环特性的影响  

Effect of Hydrogen Storage Circulation Properties of Mg2Ni Alloys Doped with Ce and Ti Hydrides under Different Preparation Processes

作　　者：姜传博 李涛[1] 赵慧颖 曹阁 JIANG Chuanbo;LI Tao;ZHAO Huiying;CAO Ge(School of Material and Metallurgy,Inner Mongolia University of Science&Technology,Baotou 014010,China;Inner Mongolia Xi'aoke Hydrogen Storage Alloy Co.,Ltd.,Baotou 014030,China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]内蒙古稀奥科贮氢合金有限公司,内蒙古包头014030

出　　处：《热加工工艺》2020年第14期71-74,78,共5页Hot Working Technology

摘　　要：研究了不同制备工艺下不同量的Ce和Ti添加剂对Mg2Ni合金性能的影响。结果表明:不同的制备工艺导致了复合材料结构和颗粒尺寸的不同。制备得到的Mg2Ni+20wt%(Ce H3-TiH2)复合材料在373 K温度下的吸氢量为1.5wt%,在573 K温度下的放氢量为2wt%。与复合物Mg2Ni+20wt%Ce Mg2Ni+10wt%TiH2相比,Ce0.09Mg2Ni+10wt%TiH2样品的氢扩散动力学性能有了显著改善。试验发现,Mg2Ni+20wt%(Ce H3-TiH2)在吸放氢循环过程中有结构的转化。首先是Ti从复合添加剂中分离后,与Mg2Ni相发生反应生成Mg3Ti Ni2相;而新生成的Mg3Ti Ni2相增加了各相之间的自由界面能,将Mg2Ni+20wt%(Ce H3-TiH2)复合物的起始放氢温度降低到了383 K。The effects of different amounts of Ce and Ti additives on the properties of Mg2Ni alloy under different preparation processes were investigated.The results show that,the different preparation processes lead to different structure and particle size of composite materials.The obtained composites absorb above 1.5wt%hydrogen at 373 K,and release about2wt%hydrogen at 573 K.Comparing with the Mg2Ni+20wt%Ce Mg2Ni+10wt%TiH2composite,the Ce0.09Mg2Ni+10wt%TiH2sample reveals a significant improvement on the hydrogen diffusion kinetic properties.It is found that the alloy has structural transformation during hydrogen absorption and desorption cycle.Firstly,Ti is separated from the compound additive and reacted with Mg2Ni phase to form Mg3Ti Ni2phase,and the new phase Mg3Ti Ni2increases the free interfacial energy between the phases in the composite.The new interface can reduce the initial hydrogen desorption temperature of the Mg2Ni+20wt%(Ce H3-TiH2)complex to 383K.

关 键 词：复合添加剂 Mg2Ni合金 储氢材料 球磨 微观结构 动力学性能 

分 类 号：TB333.12[一般工业技术—材料科学与工程]