用SPS技术制备La-Mg-Ni储氢合金的工艺探究  

Study on the Processing of La-Mg-Ni Hydrogen Storage Alloys Prepared by SPS

作　　者：安富强[1] 李平[1] 郑雪萍[1] 曲选辉[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2007年第5期907-909,共3页Rare Metal Materials and Engineering

摘　　要：采用放电等离子烧结技术(SPS)制备La-Mg-Ni储氢合金,以La0.7Mg0.3Ni2.5Co0.5合金为例,探究最佳的工艺制度。结果表明:当烧结温度为800℃时,合金为多相结构,包括(La,Mg)Ni3相、(La,Mg)2Ni7相、Mg2Ni相和微量的Co2Mg相;在该温度下,合金的最大放电容量达到最大值359mAh/g,同时表现出最好的放电平台特性。Spark plasma sintering （SPS） proces was used in this study to prepare the La-Mg-Ni hydrogen storage alloys in order to avoid the drawbacks of high temperature and long time of other processes and to improve the repeatability. La0.7Mg0.3Ni2.5 Co0.5 alloy was used as an example to determine the best processing parameters. The results indicate that the alloy sintered at 800℃ is multiphase structure and composed of the （La, Mg）Ni3 phase, （La, Mg）2Ni7 phase, Mg2Ni phase and little Co2Mg phase. The alloy has the maximum discharge capacity up to 359 mAh/g, and the best characteristic of discharge potential at the same time.

关 键 词：放电等离子烧结(SPS) 储氢合金 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]