采用高能振动球磨法,制备了Mg35Ti65合金,并添加(10% La0.4Ce0.1Pr0.3Nd0.2Ni4Co0.5Mn0.3Al0.2)作为改性剂,制备了储氢合金Mg35Ti65/(10% La0.4Ce0.1Pr0.3Nd0.2Ni4Co0.5Mn0.3Al0.2),研究了改性剂的添加及球磨时间对合金显微组织、吸放氢性能的影响规律。结果表明:球磨Mg35Ti65时间为20h时,能获得单一的BCC固溶体相,加入质量分数为10%的改性剂球磨0.5h时能明显地改善其储氢性能,8MPa,573K下100s内吸氢质量能达到3%,随着球磨时间的增加,其相结构发生改变,吸氢量及动力学性能逐渐变差。
The Mg35Ti65 hydrogen storage alloys were prepared by high-energy ball-milling,which added 10wt.% La0.4Ce0.1Pr0.3Nd0.2Ni4Co0.5Mn0.3Al0.2 as a modifier.The effects of modifier addition and milling time on the microstructure,hydrogen absorption properties of the alloys were studied.The results showed that the single BCC solid solution can be obtained after the Mg35Ti65 alloy was milled for 20h.Adding 10wt% modifier and milling for 0.5h,the hydrogen storage properties were obviously improved and its hydrogen storage capacity reached to 3wt.% at 8MPa hydrogen pressure and 573K within 100s.As increase of ball-milling time,the phase structure of Mg35Ti65 hydrides changed,the hydrogen absorption capacity and kinetics became worse gradually.
[1] 张燕莉,张旭阳.机械球磨法添加Fe、Co及Al制备镁基储氢材料[J].化工新型材料,2019,47(8):58-60.
[2] Asano K,Enoki H,Akiba E.Synthesis of HCP,FCC and BCC structure alloys in the Mg-Ti binary system by means of ball milling[J].J Alloys Compd,2009,480:558-563.
[3] Niessen R A H,Notten P H L.Electrochemical hydrogen storage characteristics of thin film MgX (X=Sc,Ti,V,Cr) compounds[J].Electrochem Solid-State Lett,2005,8:A534-A538.
[4] Vermeulen P,Niessen R A H,Notten P H L.Hydrogen storage in metastable MgyTi(1-y) thin films[J].Electrochem Commun,2006,8:27-32.
[5] Borsa D M,Gremaud R,Baldi A,et al.Structural,optical,and electrical properties of MgyTi(1-y)Hx thin films[J].Phys Rev B,2007:75:205408.
[6] 罗永春,孟成,许世红,等.高能球磨制备MgxTi100-x合金的微观组织及储氢性能[J].兰州理工大学学报,2011,37(5):9-13.
[7] Zhang Y,Tsushio Y,Enoki H,et al.The study on binary Mg-Co hydrogen storage alloys with BCC phase[J].J Alloys Compd,2005,393:147-153.
[8] Zhang Y,Tsushio Y,Enoki H,et al.The hydrogen absorption-desorption performances of Mg-Co-X ternary alloys with BCC structure[J].J Alloys Compd,2005,393:185-193.
[9] Shao H Y,Asano K,Enoki H,et al.Preparation and hydrogen storage properties of Mg-Ni-B BCC alloys[J].Mater Sci Forum,2007,561-565:1625-1628.
[10] Niessen R A H,Notten P H L.Electrochemical hydrogen storage in MgSc alloys:a comparative study between thin films and bulk materials[J].J Alloys Compd,2006,417:280-291.
[11] Sabitu S T,Gallo G,Goudy A J.Effect of TiH2 and Mg2Ni additives on the hydrogen storage properties of magnesium hydride[J].J Alloys Compd,2010,449:35-38.
