钐对无钴AB_(5)型稀土贮氢合金微观结构和电化学性能的影响  

Influence of Sm additive on the microstructure and electrochemical property of Co-free AB_(5)-type hydrogen storage alloys

作　　者：高金良 李军 张薇 房成 张羊换[2] GAO Jinliang;LI Jun;ZHANG Wei;FANG Cheng;ZHANG Yanghuan(Weishan Cisri Rare Earth Materials Co.,Ltd.,Weishan 277600,Shandong,China;Research Institute of Functional Materials,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]微山钢研稀土材料有限公司,山东微山277600 [2]钢铁研究总院功能材料研究院,北京100081

出　　处：《金属功能材料》2022年第1期1-7,共7页Metallic Functional Materials

基　　金：山东省重大科技创新工程(2019JZZY010320)。

摘　　要：用真空感应熔炼铸锭以及快淬工艺制备过化学计量比无钴AB_(5)型稀土贮氢合金La_(0.85-x)Ce_(0.15)Sm_(x)Ni_(4.55)Mn_(0.40)Al_(0.30)和La_(0.69)Ce_(0.31-x)Sm_(x)Ni_(4.55)Mn_(0.40)Al_(0.30)(x=0,0.08,0.16)。研究了钐含量及快淬对无钴AB_(5)型稀土贮氢合金的微观结构、吸放氢性能、电化学性能以及合金粉化、氧化的影响。结果表明,由真空感应熔炼铸锭工艺制备的贮氢合金为CaCu_(5)型单相结构,钐含量的增加对贮氢合金的晶格常数、晶胞体积、贮氢性能影响不大,但能显著改善合金的电化学循环稳定性和抗粉化能。相较于铸造工艺,快淬工艺能有效提高合金的电化学循环稳定性。The rare earth based over-stoichiometric AB_(5) type hydrogen storage alloys of La_(0.85-x)Ce_(0.15)Sm_(x)Ni_(4.55)Mn_(0.40)Al_(0.30) and La_(0.69)Ce_(0.31-x)Sm_(x)Ni_(4.55)Mn_(0.40)Al_(0.30)(x=0,0.08,0.16)were prepared by vacuum induction melting ingot casting and rapid quenching.The effects of Sm additive and rapid quenching on the microstructure,hydrogen absorb and desorb property,electrochemical property,powdering and oxidation of the experimental alloys were investigated.The results show that the hydrogen storage alloy prepared by casting has a CaCu_(5)-type phase structure.With the increase of Sm content,the lattice parameter,unit cell volume and hydrogen storage property change a little,but the cycle stability and anti-powdering property increase obviously.Compared with the casting process,the rapid quenching process can effectively improve the electrochemical cycle stability of the alloy.

关 键 词：贮氢合金 无钴合金 微观结构 贮氢性能 电化学性能 钐 

分 类 号：TG139.7[一般工业技术—材料科学与工程]