LaNi_(3.8)Co_(1.1)Mn_(0.1)/TiMn_(1.5)贮氢合金的结构和性能  

Structure and properties of LaNi_(3.8)Co_(1.1)Mn_(0.1)/TiMn_(1.5) hydrogen storage alloys

作　　者：黄贺伟[1] 王仲民[1] 时念雷[1] 苏泉榕[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2012年第5期426-430,共5页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(50961004);广西自然科学基金(2011GXNSFD018004);广西教育厅科研项目(201201ZD009);国家级大学生创新性实验项目(101059530)

摘　　要：为了探索一种新的掺杂方式对AB5型贮氢合金贮氢性能的影响,采用熔炼掺杂方法制备La-Ni3.8Co1.1Mn0.1/TiMn1.5(TiMn1.5质量分数为4%、8%)贮氢合金,利用PCTPro-2000气体吸附测量仪研究了合金的气态储氢性能。XRD和SEM分析显示,熔炼掺杂后合金主相为LaNi5相,出现少量(NiCo)3Ti相。P-C-T测试结果表明,(NiCo)3Ti相的出现对合金气态贮氢性能有较大影响,熔炼掺杂后合金吸放氢平台压和滞后效应降低,贮氢容量减少。掺杂TiMn1.5使得合金的氢化物的生成焓由原始合金的-27.35kJ/mol降至-29.14kJ/mol(掺杂质量分数8%的TiMn1.5),较高温度有利于合金中氢的释放,同时掺杂形成的(NiCo)3Ti相改善了合金吸/放氢动力学性能。To explore the affection of a new way doping on AB5-type hydrogen storage alloys,LaNi3.8Co1.1Mn0.1/TiMn1.5（TiMn1.5：4%,8%）hydrogen storage alloys were prepared by melt-doping in an argon atmosphere,and its Gaseous hydrogen storage properties were measured with PCTPro-2000 gas sorption analyzer.XRD analysis indicate that the doped alloy samples consist of a main LaNi5 phase and small（NiCo）3Ti phase.P-C-T curves show that the pressure plateau and lag effect dropped,while the hydrogen absorption capacity fall due to the formation of（NiCo）3Ti phase in melt-doping process.In addition,enthalpy of formation（-ΔH） of the hydride decreased from-27.35 kJ/mol H2（original alloy） to-29.14 kJ/mol H2（8% TiMn1.5 doped）.Higher temperature is beneficial to desorption properties of these hydrides,and the existence of（NiCo）3Ti phase is good for the improvement of absorption/desorption kinetics.

关 键 词：熔炼掺杂 贮氢合金 P-C-T曲线 吸放氢动力学 

分 类 号：TG139.8[一般工业技术—材料科学与工程]