化學(xué)共沉淀制備Sm-Co永磁材料前驅(qū)體粉末及其熱分解過程研究.pdf

1、中南大學(xué)碩士學(xué)位論文化學(xué)共沉淀制備SmCo永磁材料前驅(qū)體粉末及其熱分解過程研究姓名：李平申請學(xué)位級別：碩士專業(yè)：有色金屬冶金指導(dǎo)教師：郭學(xué)益20060401碩士學(xué)位論文ABSTRACTABSTRACTSm—Coalloyisakindofmagneticmaterialwithhi曲powerandhasbeenappliedinmodemindustrywidelyAtpresent，thecommonlyusedmethodsare

2、powdermetallurgyandreductiondiffusionintheproductionofSmCopermanentmagnetHoweveritisn’treportedthattheSmCopermanentmagnetismadebychemicalcoprecipitationreductiondiffus—ionmethodIntheresearch，processofrawmaterialpreparati

3、onbasedonreductiondiffusionmethodWasaddedSOthatuniformchemicalcomponent，sizeandmorphologyofraWmaterialofreductiondiffusionprocesscouldbecontrolledAtlast，powdermillingprocessafterreductiondiffusionprocesscouldbeomitted，ox

4、idationanddifferentchemicalcomponentofSmCopermanentmagnetcouldbeavoidedTheprocessofrawmaterialpreparationincludesmainlychemicalcoprecipitaionprocessandheatdecompositionprocessInthechemicalCO—precipitationprocess，theappro

5、priateCO—precipitio—nsystemWasdesignedandtheeffectsofthesystemwereinvestigatedTheoptimumconditionsoftheprocesswereaddressedandtheSmCoalloyoxideprecursorparticleswithfinemorphology，narrowsizedistributionwasobtainedRulesof

6、sizedistributionandmorphologyoftheprecursorWasinvestigatedaccordingtosolutionchemistryBasedonthethermaldynamicalchemicalequilibriumfigure，theintrinsicrolesaboutsizedistributionandmorphologyoftheprecursorwerestudied，combi

7、nedwiththeoriesandviewsofreactionprecipitationandcrystaldynamicsIthadbeenevidencedthatsomeeffectssuchaslowconcentrationshortagji—ngtime，moreadditiveetcbenefitedcon_【rollationofsizeandsizedistributionofparticlesandsomeeff

8、ectssuchasadditiveandanionbenefitedcontrollationofmorphologyTheappropriatewashmethodanddrymethodweredeterminedBasedonDSCTGAanalysis，thecourseofheatdecompositionWasstudiedMeanwhile，thepreeipitationofcobakcompoundofSmCo(OH