热处理对新能源汽车用(La_(0.7)Mg_(0.3))Ni_(x)合金储氢特性的影响研究  

Influence of Heat Treatment on Hydrogen Storage Properties of(La_(0.7)Mg_(0.3))Ni_(x)Alloy for New Energy Vehicles

作　　者：聂光辉 魏垂泉 NIE Guanghui;WEI Chuiquan(Luoyang Voc ational&Technical College,Luoyang 471000,China;Henan University of Science and Technology,Luoyang 471003,China)

机构地区：[1]洛阳职业技术学院,河南洛阳471000 [2]河南科技大学,河南洛阳471003

出　　处：《热加工工艺》2021年第24期39-42,共4页Hot Working Technology

基　　金：河南省重点科研项目应用研究计划(2017B480001)。

摘　　要：采用铸锭法和快淬法制备了(La_(0.7)Mg_(0.3))Ni_(3)储氢合金,考察了热处理温度和时间对(La_(0.7)Mg_(0.3))Ni_(3)储氢合金的物相组成和储氢性能的影响。结果表明,铸锭法原始态储氢合金的物相主要有LaNi_(5)和(LaMg)_(2)Ni_(7)相,825、900、975℃热处理并未改变储氢合金的物相组成,但是储氢合金中LaNi_(5)相有朝着向(LaMg)_(2)Ni_(7)相转变的趋势。快淬法原始态储氢合金的物相主要有LaNi_(5)、(LaMg)_(2)Ni_(7)和(LaMg)Ni_(3)相,经过825、900、975℃热处理后,储氢合金中(LaMg)Ni_(3)相消失。铸锭法储氢合金经过热处理后的放氢容量和吸放氢平台相较于原始态都有不同程度提高,900℃/4 h热处理的储氢合金具有最高的吸放氢平台和最大的有效放氢容量;快淬法储氢合金经过热处理后的储氢合金的放氢容量和吸放氢平台变化不大。铸锭法储氢合金经过900℃/4 h热处理具有最佳的储氢性能。(La_(0.7)Mg_(0.3))Ni_(3) hydrogen storage alloys were prepared by ingot casting and rapid quenching methods.The effects of heat treatment temperature and time on the phase composition and hydrogen storage properties of(La_(0.7)Mg_(0.3))Ni_(3) hydrogen storage alloys were investigated.The results show that LaNi_(5) and(LaMg)_(2)Ni_(7) phases are the main phases in the original hydrogen storage alloy by ingot casting.The phase composition of hydrogen storage alloy is not changed by heat treatment at 825℃,900℃and 975℃,but LaNi_(5) phase in hydrogen storage alloy tends to transform into(LaMg)_(2)Ni_(7) phase.The results show that LaNi_(5),(LaMg)_(2)Ni_(7) and(LaMg)Ni_(3) phases are the main phases in the original hydrogen storage alloy prepared by rapid quenching.After heat treatment at 825℃,900℃and 975℃,the(LaMg)Ni_(3) phase disappears in hydrogen storage alloy.Compared with that of the original state,the hydrogen storage capacity and hydrogen absorption and desorption platform of the ingot hydrogen storage alloy after heat treatment are improved to varying degrees.The hydrogen storage alloy heat treated at 900℃/4 h has the highest hydrogen absorption and desorption platform and the maximum effective hydrogen evolution capacity.The hydrogen storage capacity and hydrogen absorption and desorption platform of the hydrogen storage alloy after heat treatment by rapid quenching method have little change.The hydrogen storage alloy prepared by ingot casting has the best hydrogen storage property after heat treatment at 900℃/4 h.

关 键 词：制备工艺 储氢合金 热处理温度 保温时间 电化学性能 

分 类 号：TG131[一般工业技术—材料科学与工程]