【摘要】 采用高能球磨法制备了Mg+x%Mm（NiCoMnAl）₅（x=10、20、30和40）纳米晶和非晶混合结构的复合储氢材料,并对其结构和吸放氢性能进行了研究．XRD结果表明,Mg与Mm（NiCoMnAl）₅球磨200h后有Mg₂Ni和La₂Mg₁₇相生成．吸氢动力学研究发现,在423K和3．4 MPa下,随着x增大,吸氢速率和最大吸氢量都出现了先增大后减小的趋势．当x=20时,复合材料的吸氢性能达到最佳,其最大吸氢速率达到0．45%/s,50s内即可吸氢3．6%．热重分析结果表明,Mg的氢化物相放氢温度降低到259℃（x=40）．更多还原

【Abstract】 The Mg+x% Mm（NiCoMnAl）₅（x=10、20、30 and 40）nano-/amorphous com- posite materials have been prepared by ball milling.Their microstructure and hydriding proper- ties have been investigated.X-ray diffraction（XRD）results showed that La₂Mg₁₇ and Mg₂Ni phases were formed after ball milling.The hydriding results showed that the addition of Mm （NiCoMnAl）₅ significantly improved the hydriding properties of Mg.The hydriding rate and the hydrogen capacity first increased and then decreased with the increase of the Mm（NiCoM- nAl）₅ content.When x was equal to 20,the composite material had the best hydriding perfor- mance.The maximum hydriding rate was 0.45%/s and the hydriding capacity reached 3.6% within 50 s at 423 K and 3.4 MPa.TG analysis showed that the desorption temperature of magnesium hydrides was 259℃when x was equal to 40.更多还原