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ID:33668055
大小:1.80 MB
页数:69页
时间:2019-02-28
《机械合金化mg基复合储氢材料性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、上海大学倾十学位论文摘要随着新能源开发要求日益迫切,Mg基储氢材料的开发研究受到了人们越来越多的重视。近几年对镁基合金的改性研究相当活跃,但不同程度存在吸放氢温度高,吸放氢速度慢等问题。用机械合金化方法并添加复合成分制备出具有纳米晶或非晶结构的复合Mg基粉末被认为是最有前途的改性方法之一。本文主要以机械合余化法制备了M92Ni/MgNi、Mg-10、vt%Ni4Mo、Mg.10州%zrNiV三类Mg基储氢粉末。通过研究它们的相结构,P—c—T性能和低温表面活性,找出具有较好低温吸氢性能的储氢合金,并初步探讨晶态,纳米晶,非晶态以及内部结构对其储氢
2、性能的影响。与单质Ni球磨时,具有部分非晶的M92Ni粉末最大吸氢量(3.45、vt%)大于MgNi非晶粉木的最大吸氢量(1.49Ⅲ%)。分析原因可能为非晶相并不具有活性表面或活性比表面很小,而具有部分非晶相的M92Ni仍具有晶念的M92Ni,它具有较大的活性比表面,将对氢进行催化裂解,从而促进氢的吸收。晶态M92Ni合金粉术表面活性远大于非晶M92Ni合会粉末,活性比表面值分别为0432m2/g和22.5lm飞,推测M92Nj晶态合金的长程有序是其表面活性较强的主要原因。与金属l列化合物Ni4Mo球磨制备的Mg+lO%有序Ni4Mo储氢量很小(
3、4、键词:机械合金化储氢性能表面活性V上海大学硕士学位论文ABSTRACTWithu喀entdemandsofnewene唱yexploitatiOn,theresearchonhydrogenstoragematerials艄ractedmOreandmoreattention,especia¨yM92NiandM争basedmaterials.Inrecemyears,theimprovementofM争basedhydmgenstoragealloyisquiteactive,butlhem萄orchallengeswerestilIt0acc5、elerateabsorptio州desorptionkinetics,increaSec”le1ifeandt0lowerabsorptioll/desOrptiontemperatllreToabtainakjndofcompoundpowderwiIhnano—crystal】ineoramOrphousstructurebymechanicalalloyingwaSconsideredtobeoneofthemostpromisingmethods.ThematerialsstudiedinthispaperwereM92Ni/MgNi,6、Mg-10、vt%Ni4Mo,Mg-lOwt%ZrNiVpreparedbymech柚icalalloying.To行ndthebestcandidatewjthlow-temperatureabsorptio洲e∞rpnonperfbrmance,phasestructures,P-c·TteStsandsu墒ceactivityatlowtemperaturewereinvestjgatedandmeantime,theeffbctofcrysta7、line,nanocfystalline,amorphOusaswelJasintemalst8、rucmreonabsorption,desorptionperfomlancewerepreIiminarydiscussed.ThemaximumhydrogencapacityofM92NiwithpartsofamophousstucIurewas3.45wI%whichwashigherthanlhatofMgNiwithonIyamorphousstructure(1.49wt%).Theactivesu—hceratioofM92NicrystaIlinepowderwas22.5lm2,g,whichwasabout50times9、la唱erthanth砒ofMg削iamophouspowder(o.432m钝).Iljssuggestedthatthehighca
4、键词:机械合金化储氢性能表面活性V上海大学硕士学位论文ABSTRACTWithu喀entdemandsofnewene唱yexploitatiOn,theresearchonhydrogenstoragematerials艄ractedmOreandmoreattention,especia¨yM92NiandM争basedmaterials.Inrecemyears,theimprovementofM争basedhydmgenstoragealloyisquiteactive,butlhem萄orchallengeswerestilIt0acc
5、elerateabsorptio州desorptionkinetics,increaSec”le1ifeandt0lowerabsorptioll/desOrptiontemperatllreToabtainakjndofcompoundpowderwiIhnano—crystal】ineoramOrphousstructurebymechanicalalloyingwaSconsideredtobeoneofthemostpromisingmethods.ThematerialsstudiedinthispaperwereM92Ni/MgNi,
6、Mg-10、vt%Ni4Mo,Mg-lOwt%ZrNiVpreparedbymech柚icalalloying.To行ndthebestcandidatewjthlow-temperatureabsorptio洲e∞rpnonperfbrmance,phasestructures,P-c·TteStsandsu墒ceactivityatlowtemperaturewereinvestjgatedandmeantime,theeffbctofcrysta
7、line,nanocfystalline,amorphOusaswelJasintemalst
8、rucmreonabsorption,desorptionperfomlancewerepreIiminarydiscussed.ThemaximumhydrogencapacityofM92NiwithpartsofamophousstucIurewas3.45wI%whichwashigherthanlhatofMgNiwithonIyamorphousstructure(1.49wt%).Theactivesu—hceratioofM92NicrystaIlinepowderwas22.5lm2,g,whichwasabout50times
9、la唱erthanth砒ofMg削iamophouspowder(o.432m钝).Iljssuggestedthatthehighca
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