Zhang Yanghuan, Ji Yanquan, Yuan Zeming, Bu Wengang, Qi Yan, Guo Shihai
Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology Baotou 014010 China.
Department of Functional Material Research, Central Iron and Steel Research Institute Beijing 100081 China
RSC Adv. 2018 Aug 14;8(51):28969-28977. doi: 10.1039/c8ra05429k.
Melt spinning was successfully utilized to prepare Mg Y NiCu ( = 0, 1, 3, 5, 7) alloys, producing nanocrystalline and amorphous structures with improved hydrogenation and dehydrogenation performances. The influence of spinning rate on hydrogenation and dehydrogenation thermodynamics and kinetics was studied in detail. XRD and TEM were utilized to characterize the alloy structures. Hydrogenation and dehydrogenation performances were investigated by Sievert apparatus, DSC and TGA connected to a H detector. Dehydrogenation activation energies were estimated using both Arrhenius and Kissinger methods. Results show that melt spinning significantly decreases thermodynamic parameters (Δ and Δ) and ameliorates desorption kinetics. Dehydrogenation activation energy markedly lowers with increase in spinning rate and is the real driver of amelioration of dehydrogenation kinetics caused by increasing Y content.
采用熔体纺丝成功制备了MgYNiCu（=0、1、3、5、7）合金，得到了具有改善的氢化和脱氢性能的纳米晶和非晶结构。详细研究了纺丝速率对氢化和脱氢热力学及动力学的影响。利用X射线衍射（XRD）和透射电子显微镜（TEM）对合金结构进行了表征。通过与氢探测器相连的Sievert装置、差示扫描量热法（DSC）和热重分析法（TGA）研究了氢化和脱氢性能。采用Arrhenius法和Kissinger法估算了脱氢活化能。结果表明，熔体纺丝显著降低了热力学参数（Δ和Δ），并改善了解吸动力学。脱氢活化能随纺丝速率的增加而显著降低，是Y含量增加导致脱氢动力学改善的真正驱动因素。
