LaNi_(4．25)Al_(0．75)储氢合金的改性  

Modification of LaNiAl hydrogen storage alloys

作　　者：万伟华[1] 唐有根[1] 卢周广[1] 朱志节[1] 谢正和[1] 

机构地区：[1]中南大学化学化工学院

出　　处：《中南大学学报（自然科学版）》2007年第1期107-111,共5页Journal of Central South University:Science and Technology

摘　　要：为了提高LaNi4．25Al0．75合金的储氢性能,采用退火、表面镀铜和表面包覆SiO2对合金进行改性,并对处理前、后合金的微观结构和吸放氢性能的变化进行研究。研究结果表明,退火消除了LaNi4．25Al0．75合金中的偏析,减少了内应力,使合金具有平坦的吸氢平台;表面镀铜处理加快了合金的吸、放氢速度,但吸氢含量略有降低,另外,镀铜合金抗粉化性能加强,经10次吸、放氢循环后没有出现粉化现象;表面包覆SiO2前、后,合金的吸氢量变化不大,抗粉化性能加强,经10次吸、放氢循环后没有出现粉化现象。The modification of microstructure and hydrogen absorption/desorption properties of LaNi4.25Al0.75 hydrogen storage alloys were carried out by high-temperature annealing, surface Cu coating, and surface SiO2 coating. The results show that annealing can eliminate segregation in the alloys and lessen internal pressure, and smoothen the hydrogen absorption/desorption platform of the alloys. Surface Cu coating enhances the speed of hydrogen absorption/desorption considerably, and the hydrogen absorption voltage reduces a little, but no evident pulverization can be found in this alloy after 10 hydrogen absorption/desorption cycles. Alloys with SiO2 coating also show excellent pulverization resistance, no evident pulverization can be found in this alloy after 10 hydrogen absorption/desorption cycles and absorption voltage is almost the same as nude LaNi4.25Al0.75 alloys.

关 键 词：储氢合金 热处理 包覆 抗粉化性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]