低溫燃燒合成法制備ZrO-,2-基納米復(fù)合粉末.pdf

1、湖南大學(xué)碩士學(xué)位論文低溫燃燒合成法制備ZrO基納米復(fù)合粉末姓名：陳爽申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：嚴(yán)紅革20090512碩：學(xué)位論文AbstractPreparationofhighqualityZr02powderisthebasisofapplicationAlthoughtherearealotofmethodsforthepreparationofZr02nanocrystallinepowder，itisdif

2、ficulttoobtainZr02nanocrystallinepowderwithcontrolledsurfacemorphologyandparticlesizeaswellasaconcentratedsizedistributionLowtemperaturecombustionsynthesisisamethodusingtheheatreleasedfromtheredoxreactionbetweenfuel(redu

3、cingagent)andoxidantstopromotethecombustionreactionwiththeadvantageofsimplifyingthetechnique，shorteningtheexperimentcycle，andobtainingaproductwithconcentratedparticlesizedistribution，highpurityandactivityInthispaper，lowt

4、emperaturecombustionsynthesiswasusedtoprepareZr02nanocrystallinepowder，whileXRD，TG—DTA，TEMandotheranalyticaltoolswereusedforthecharacterizationofthepowderThemainconclusionsobtainedwereasfollows：Welldispersednanocrystalli

5、nepowderwasobtainedwhenthemolarratiobetweenzirconiumnitrateandureawas1：15duringthepreparationofZr02nanocrystalIinepowderandcomplexZr02nanocrystallinepowderwithanadditiveof3m01％Y203(YSZ)Thevarietyofburningagentshadasignif

6、icantinfluenceontheparticlesizeoftheobtainedZr02nanocrystallinepowderWhile，byusingcitricacidasoxidationagentforthecombustion，theobtainedpowdershowedabetteruniformityinparticlesizewhichwaswithin10nmTheauthorbelievesthatZr

7、02crystaltransformedfromatetragonalphase(tphase)toamonoclinicphase(mphase)atroomtemperaturewithacriticalsizeof10rimAstheparticlesizeofZr02grewup，thevolumefractionofm—Zr02inthesynthesizedpowdergraduallyincreasedTheadditio

8、nofY203couldstabilizeZr02’sphasewhichwastetragonalatroomtemperatureZr02powderpreparedbylowtemperaturecombustionsynthesiswith3m01％Y203(particlesizewerelessthan30nm)hadstabilizedtetragonalphasewhichwouldnotchangeintomonocl

9、inicphasewhenheatedat1300。CMgOnanocrystallinepowderandZr02一MgOnanocrystallinecompositepowderweresynthesizedusingmagnesiumnitrateandcitricacidWhenthemolarratiobetweennitrateandcitricacidwas9：4，andthesolutionpHwas4，thesynt