热处理对快淬贮氢合金组织和电化学性能的影响  

Influence of Heat Treatment on Microstructure and Electrochemical Properties of Rapid Quenching Hydrogen Storage Alloy

作　　者：李全安[1] 陈云贵[2] 涂铭旌[2] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]四川大学金属材料系,四川成都610065

出　　处：《稀土》2004年第1期5-8,共4页Chinese Rare Earths

基　　金：四川省重点科研成果与转化基金(1997-1191);河南省杰出青年基金(0312000200);河南省高校创新人才培养基金(豫教高[2002]129)

摘　　要：通过XRD、SEM分析和电化学实验,研究了热处理对快淬贮氢合金组织和电化学性能的影响。研究表明,400℃热处理对快淬合金晶粒变化不明显,900℃热处理后合金晶粒明显长大,1100℃热处理使合金部分熔化,随后发生了平衡凝固;900℃热处理后,单胞体积和放电容量均达到最大值,但充放电循环稳定性最差,400℃和1100℃热处理后,放电容量稍有降低,但充放电循环稳定性较好。The influence of heat treatment temperature on the microstructure and electrochemical properties of rapid quenched hydrogen storage alloy Ml(NiCoAlMn)_5 (Ml=lanthanum-rich mischmetal) has been investigated by XRD, SEM and electrochemical test. The results show that the grain growth is not obvious for heat treatment at 400℃, but obvious at 900℃, and at 1100℃ the rapid quenched alloy melts in form of flake,then solidifies in equilibrium. The cell volume and the discharge capacity is largest at 900℃,but the cycling stability is worst at this temperature. The discharge capacity is slightly low but the cycling stability is better at 400℃ and 1100℃.

关 键 词：稀土 贮氢合金 快淬 电化学性能 金属氢化物 NI-MH电池 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TM241[金属学及工艺—合金]