超细氧化铝粉体制备过程分散性及形貌控制研究

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1、中南大学硕士学位论文超细氧化铝粉体制备过程分散性及形貌控制研究姓名：万烨申请学位级别：硕士专业：有色金属冶金指导教师：肖劲2007040120：1，球磨时间为4h，再经过干燥和高温煅烧，所制备的氧化铝片状粉末分散性能好，形貌规整，片层厚度均一，是制备铝酸盐荧光粉的理想原料。关键词：超细氧化铝；制备方法；分散性；形貌；粒度分布ⅡABSTRACTUltrafinealumina，withextensivelyexcellentpropertiessuchashighmeltingpoint’highheat-resistance，highcorro

2、sion-resistance，goodelectricalinsulationandcatalyticabilities，etc，isaveryimportantbranchofultrafmepowdermaterialsandwidelyappliedinfieldsofca'amics，metallurgy,electronandcatalysts．Thl℃emethodswereusedforpreparingultrafmealuminapowdersinthispaper,theeffectsofmethodsandthecond

3、itionsondispersionandmorphologyofultrafinealuminawer；ealsodiscussed．Mainresearchconclusionsareasfollows：(1)AmmoniumaluminumcarbonatehydroxideWassynthesizedastheprecursorbytheprecilcIitationreactionofaluminumsulfateandammoniumcarbonate，andtheeffectfactorsofreactiononpreparati

4、onofAACHwerediscussed,11”researchdemonstratedthatthebetterconditionsforsynthesizingAACHwereasfollows：reactiontemperatureis60℃，reactiontimeis20rain，millingspeedis1000r／min，aluminumsulfateatomizingintoammoniumcarbonate．adding5％PEG2000asdispersant,controllingthepHvalueabout10，a

5、ndquicktemperaturedowning．AACHwithuniformparticlesizewell-distributedandgooddispersionWaSobtainedunderthebeRerconditions．(2)Theeffectsofdryingconditionsonthedispersionofprecursorwerestudiedinthispaper,andaccordingtothestudiesdonebefore，thepossiblemechanismoftheformationofagg

6、lomeratesinordinarydryingWaSofferedforthefirsttime．Basedonthestudies，atomizingfreezedrying，anewdryingmethodforpreventingagglomerationisputforward．(3)Underthecombinationofoptimizedconditionsandatomizingfreezedrying，theultrafineQ捌203withuniformparticlesizeandinsphericalshapean

7、dwelldispersedWasobtainedbyAACHcalcined砒1200"Cfor2h,whichistheideallyrawmaterialforthepreparationofceramic．(4)Theultrafinealuminapowderwaspreparedbyhomogeneousprecipitationmethodusingaluminumsaltandureaasrawmaterial．Theeffectfactorsofreaction，suchastheratioofreactant,initial

8、llIconcentrationsofAI”，reactiontemperature，heat-preservationtime，dryingcond