氢化燃烧合成与机械合金化复合制备LaMg_(11.5)Ni_(0.5)储氢材料  

Hydrogen storage material of LaMg_(11.5)Ni_(0.5) prepared by hydriding combustion synthesis followed by mechanical milling

作　　者：顾昊[1] 朱云峰[1] 李李泉[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《粉末冶金技术》2009年第2期104-107,共4页Powder Metallurgy Technology

基　　金：国家高技术研究发展计划资助项目(2007AA05Z110);江苏省高技术研究重大项目(BG2007052);南京工业大学博士学位论文创新基金资助项目(BSCX200703)

摘　　要：采用氢化燃烧合成和机械球磨复合制备了LaMg11.5Ni0.5三元储氢材料,物相分析可知,该体系由MgH2、Mg、Mg2NiH4,Mg2NiH0.3,LaH2以及少量LaNi5H0.3构成。氢化燃烧合成产物LaMg11.5Ni0.5经20h球磨后,在423K时,100s内达到饱和吸氢量3.42%(质量分数);在523K时,1800s内放氢基本完全,放氢量为3.29%(质量分数)。研究表明,该产物在523K时的放氢过程受界面移动过程控制。In this paper, LaMg11.5 Ni0.5 ternary hydrogen storage materials were prepared by hydriding combustion synthesis combined with mechanical milling （HCS ＋ MM ）. The product consists of MgH2, Mg, Mg2NiH4, Mg2NiH0 .3, LaH2 and a little LaNi5 H0.3. When the product of hydriding combustion synthesis is milled for 20h, it absorbs hydrogen with absorption capacity of 3.42% at 423K in 100 s, and desorption capacity of 3.29% at 523K in 1 800s. Results show that the hydrogen desorption at 523K is controlled by phase boundary reaction mechanism.

关 键 词：储氢材料 氢化燃烧合成 机械球磨 储氢性能 稀土 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TS802.3[金属学及工艺—合金]