配位共沉淀热分解还原法制备多孔纤维状铁镍合金粉

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1、中南大学硕士学位论文配位共沉淀热分解还原法制备多孔纤维状铁镍合金粉姓名：张银亮申请学位级别：硕士专业：有色金属冶金指导教师：张传福20090509ABSTRACTWimmanyspecialqualities，forexample，smallsize，largespecificsurfacearea，activechemicproperty，specialmagnetismandetc，theultra．fineiron．nickelalloypowdersarewidelyusedinwave—absorbi

2、ngmaterials，magneticmaterials，alloyplatingmaterialsandeta1．Afteroverviewedthepreparationmethodofiron．nickelalloypowdersinhomeandabroad，anewtechnique，calledcoordinationprecipitation—thermaldecompositionreduction，iSproposedtoproducethefibrous-porousultra-fineF

3、e-Nialloypowderinthepaper．Accordingtothelawofconservationofmassandlawofsimultaneousequilibrium，themathematicsmodelofFe(II)一Ni(II)-NH3．S042．C2042"_I-120andFe(II)-Ni(II)一C2N2H8一S042。一C204z--H，，OthermodynamicequilibriumsystemiSestablished，andthecorrespondinglog

4、arithmsconcentrationofmetalions-pHvaluediagramsarealsodrawn．Basedonthesediagrams，therangeofpHvalueinthecoordinationprecipitationprocessiSdetermined．Usingthisnewprecipitationmethod，thefibrousprecursorpowdersof(Fe，Ni)complexareobtained．TheeffectsofpHvalue，orig

5、inalmetalionconcentration，temperature，chargingrate，ripeningtimeandsurfactantonthemorphologies，particlesizesanddispersionofprecursorpowdersarestudiedonthispapersystemicly．Inaddition，thefibrousprecursorpowderswithfinedispersionareproducedonoptimumcondition：pHv

6、alue6．2．thetotalmetalionconcentration0．8mol／L，temperature60℃，chargingrate0．2L／h，ripeningtime60min．BasedontheresultsofanalysisontheprecursorpowdersbyXRD，EDX，elementanalysis，IRspectraandTGA／DTAmethods，itCanbeinferredthattheprecursorisonetypeofcobaltcomplexandt

7、heconstitutionalformulaisFexNil．xC204·zH20·nC2N2H8．Inthispaper,theeffectsofmorphologiesofprecursors，temperatureandtimeduringthethermaldecompositionprocessonthemorphologiesofdecomposedproductsarealsoinvestigated．ItcanbeconcludedthatthemorphologiesofFe-Nipowde

8、rsgreatlyinherittheircorrespondingprecursors．Thefinefibrous—porousFe—Nipowderwith25．99m2{gsurfacelIareacouldbeobtainedinweakreducingatmospherewhilekeepingtemperature420℃，heatingrate10～12K／minand