mg基贮氢合金的掺杂和复合实验研究

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1、Mg基贮氢合金的掺杂和复合的实验研究摘要本文采用机械合金的制备方法对Ilg—Ti复合基贮氢合金作了一定的研究。利用机械合金化方法制备Mgz6Ti。Fe。Ni；(x=O，4，8，12)系列合金并对其储氢性能进行了系统的研究。随着Ni取代Fe的量逐渐增加，合金吸放氢的滞后现象逐渐减小，合金M勖8Ti。。FesNi。显示出了最高的吸放氢速率。Fe和Ni的共存有利于提高合金的储氢性能。对于Mg。Ti。：FesNi。合金，随着球磨的进行合金的非晶化程度提高，但是非晶化程度的提高不利于提高合金的储氢容量。鉴于合金Mg，。Ti，：FeJqi。优于

2、其他合金的贮氢性能，本文又单独对其贮氢性能做了分析，发现在PCT性能测试中40h球磨后合金159，6Ti。：FesNi。样品有最高的吸氢速率、最低的吸放氢平台压及其差值，合金Mg，。Ti．。Fe。Ni。随着球磨的进行表现出了越来越好的放氢动力学性能。利用机械合金化的方法制备M976-，Ti。：FesNi。B，(x=O，I，2，3，4)系列合金并对其储氢性能进行了系统的研究。B的加入降低了合金的吸氢温度和吸放氢速率，使合金的吸放氢平台有所上升，但其减小了吸放氢平台差，降低了滞后现象。关键词：储氢合金；热力学性能；储氢性能,V-西大掌硕

3、士掌位论文ExperimentInvestigationonMg—basedHydrogenStorageAlloysABSTRACTHydrogenstoragealloyswouldplayaveryimportantroleinapplicationofhydrogenenergy．Amongallkindsofhydrogenstoragealloysstudiedpreviously，Mg-basedalloyisoneofthemostpromisinghydrogenstoragematerialsduetoitshi

4、曲hydrogenstoragecapacity，lightweight，lowpriceandfundamentalreserves．WehavesystematicallystudiedhydrogenstoragepropertiesoftheMg—Ticompoundedalloysystembyexperimentalresearch．M976Til2Fel2．xNix(x=0，4，8，12)alloyswerepreparedbymechanicalalloyingandthehydrogenstoragepropert

5、ieswereinvestigatedsystematically．ThehysteresisbetweenhydrogenabsorptionanddesorptiondecreasesgraduallywithincreasingtheamountofsubstitutionNiforFe．M976Tij2FesNi4showsthehighesthydrogenabsorptionanddesorptionrateamongM976Til2Fel2．xNi、(x=O，4，8，12)alloys．FeandNicoexisten

6、ceisfavorabletoimprovehydrogenstorageproperties．ForM976Til2FesNi4alloy,theamorphousdegreeincreasewiththemillingtime，andtheamorphousdegreeincreaseisunfavorabletoimproveIlg-西大掌硕士掌位论文hydrogenstoragecapacityInviewofgoodhydrogenstoragepropertiesofM976FesNi4Tilzalloy，thehydr

7、ogenstoragepropertiesofM976FesNi4Til2alloyseparatelyisanalyzed．Multipalcompoundbyball—millBandM976Til2FesNi4powdertogetherisparepared．ThesubstitutionBforMgcanlowthetemperatureofhydrogenabsorptionandslowdownthespeedofhydrogenabsorptionanddesorption．Theplateaupressureasc

8、endsandthehysteresisbetweenthehydrogenabsorptionanddesorptiondecreaseswiththeamountofsubstitutionBforMgincreasing，but