納米TiO-,2-對Mg基復(fù)合材料儲氫性能的改善.pdf

1、浙江大學(xué)碩士學(xué)位論文納米TiO對Mg基復(fù)合材料儲氫性能的改善姓名：高嶸崗申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：涂江平2003.3.1塑翌查堂堡主堂焦絲壅一———————————壘墜!型AbstractInthisthesis，previousresearchworksonMg—basedhydrogenstoragematerialshavebeenreviewedOnthisbasis，thefollowingworkshav

2、ebeencarriedout：FirstlyThepartofNiinM92NialloysWaspartialsubstitutedbythetransitionelementCrTheeffectofelementCrandmechanicalalloyingonthephasestructureandhydrogenstoragepropertiesofM92NilxCrx(x=O，01，0203)alloyswereinves

3、tigatedTheM92Ni075Cr025alloywasselectedtobeball—milledwithdifferentamountof(05wt％，l，5姒％，25wt％)T102nanoparticlesTheeffectsofTi02nanopartielesoncrystallinestructurecharacteristics，kineticsandthermodynamicspropertiesoftheco

4、mpositeswerealsodiscussedSecondlyforthepurposeofimprovingthekineticspropertiesofhydriding／dehydridingandmaintainingthehighhydrogenstoragecapacityMg15wt％M92NicompositeWaSmodifiedbyballmillingwithdifferentamountofTi02nanop

5、articles，andthemicrostructure，phasecharacteristicsandhydriding／dehydridingpropertiesofmodifiedcompositesWereinvestigatedTheXRDresultsshowthattheMgzNilxCrxternaryalloyscallbepreparedbysinteringandballmilling。Themainphaseo

6、ftheternaryalloyisM92NiandtransitionelementCrwasinsolidsolutionnleball—millingandthesubstitutionmadesomedistortionwithcrystallinestructureofthealloysandsomeofNiwasprecipitatedfromtheMgNi—CrtemaryalloyThecrystallinesizeof

7、thealloydecreasedwiththeball—millingtimeandanincreaseintheamountofCrThehydridingresultsshowthatthesubstitutionofNibyCrcoulddecreasetheabsorptiontemperatureandimprovethekineticsofhydridingTheexperimentalresultsshowthatthe

8、Ti02nanopartielesdidnotchangethemainphaseofM92Ni07sCr025alloyWithincreasingtheanlountofTi02nanoparticles，thenanocrystallinesizebecamesmallerOnthebasisofthekineticsresults，itWasshownthatTi02llanoparticlesreducedtheabsorpt