机械球磨法添加Ag对ZK60储氢性能的影响
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摘要
采用ECAP细化ZK60合金晶粒,再通过机械合金化球磨方式添加5wt%C以及不同量的Ag制备Mg基储氢材料。利用储氢特性测试仪、XRD和SEM研究了Ag含量对储氢材料吸氢特性、吸氢速率和显微组织的影响。结果表明:利用机械球磨添加Ag,有利于提高ZK60合金的吸氢量。随着Ag添加量的增大,吸氢量先增大后减小,其中添加0.5wt%Ag的材料吸氢量最大,达到7.112wt%。由于吸氢过程中生成的Mg H2,在放氢过程中未彻底解离成Mg和H2,导致吸氢量下降。
The grain size of ZK60 alloy was refined by ECAP. Mg-based hydrogen storage materials were prepared by adding 5 wt% C and various content of Ag with the method of mechanical ball milling. The effects of Ag content on the hydrogen absorption performance, hydrogen absorption rate and microstructure of hydrogen storage material were studied by hydrogen storage characteristic tester, XRD and SEM. The results show that the addition of Ag by mechanical ball milling is beneficial to the improvement of hydrogen storage capacity. With the increase of Ag addition, the hydrogen storage capacity increases and then decreases. The absorption capacity of Ag-0.5 wt% ZK60 reaches the maximum value of 7.112 wt%. Becasue Mg H2 forming during the hydrogen absorption process, Mg H2 can not completely dissociate into Mg and H2 in the process of hydrogen release, which can result in the decrease of hydrogen absorption.
The grain size of ZK60 alloy was refined by ECAP. Mg-based hydrogen storage materials were prepared by adding 5 wt% C and various content of Ag with the method of mechanical ball milling. The effects of Ag content on the hydrogen absorption performance, hydrogen absorption rate and microstructure of hydrogen storage material were studied by hydrogen storage characteristic tester, XRD and SEM. The results show that the addition of Ag by mechanical ball milling is beneficial to the improvement of hydrogen storage capacity. With the increase of Ag addition, the hydrogen storage capacity increases and then decreases. The absorption capacity of Ag-0.5 wt% ZK60 reaches the maximum value of 7.112 wt%. Becasue Mg H2 forming during the hydrogen absorption process, Mg H2 can not completely dissociate into Mg and H2 in the process of hydrogen release, which can result in the decrease of hydrogen absorption.
引文
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[2] Schlapbach L.Hydrogen in intermetallic compunds II[M]. UK:Springer Berlin Heidelberg,1992.
[3] Khrussanova M, Bobet J L, Terzieva M, et al.Hydrogen storage characteristics of magnesium mechanically alloyed with YNi5-xAlx(x=0, 1 and 3)intermetallics[J].J Alloys Compd,2000,307:283-289.
[4] Bobet J L, Akiba E, Darriet B.Effect of substitution of Fe and Ni for Co in the synthesis of Mg2Co compound using the mechanical alloying method[J].J Alloys Compd,2000,297:192-198.
[5] Kadir K, Sakai T, Uehara I.Structural investigation and hydrogen storage capacity of La Mg2Ni9and(La0.65Ca0.35Mg1.32Ca0.68)Ni9of the AB2C9type structure[J].J Alloys Compd,2000,302:112-117.
[6] Kadir K, Tanaka H, Sakai T, et al.Hydrogen behavior in the La-Mg-Cu system[J].J Alloys Comp,1999,289:66-70.
[7] Liu F J, Sudan S.Hydriding behavior of F-treated Mg2Ni at moderate conditions[J].J Alloys Compd,1996,232:212-217.
[8] Nishimiya N, Wada T, Matsumoto A, et al.Hydridingdehydriding characteristics of aged Mg-10%Ni alloy hydride and water resistance of sol-gel encapsulated composite[J].J Alloys Compd,2000,311:207-213.
[9] Aoki K, Aoyagi H, Memezawa A, et al.Effect of ball milling on the hydrogen absorption rate of Fe Ti and Mg2Ni compounds[J].Journal of Alloys&Compounds,1994,203(1/2):7-9.
[10] Aoyagi H,Aoki K,Masumoto T.Effect of ball milling on hydrogen absorption properties of Fe Ti, Mg2Ni and La Ni5[J].Journal of Alloys&Compounds,1995,231(1/2):804-809.
[11]许联林,樊建锋,张华,等.氢化-脱氢制备的ZK60纳米晶镁合金粉体及其组织演化[J].稀有金属材料与工程,2017(10):2908-2914.