配位沉淀热分解法制备特种多孔铜粉

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1、中南大学硕士学位论文配位沉淀-热分解法制备特种多孔铜粉姓名：樊友奇申请学位级别：硕士专业：有色金属冶金指导教师：张传福20060101ABSTRACTSuperfinecopperpowder，whichhasexcellentphysicalandchemicalproperties，hasbeenusedwidelyaspowdermetallurgymaterials，catalysts，anti—frictionmaterials，conductingcoatsandelectromagneticshieldingmate

2、rials．Inthisthesis，advantagesanddisadvantagesofinternalandforeignpreparationtechnologiesofsuperfinecopperpowderarecommented．Accordingtothedefectsofthem，anewprocesscalledcoordinationprecipitation-thermaldecompositionisadoptedtopreparespecialporouscopperpowder．Precursor

3、andcopperpowderarecharacterizedbyX-RayDiffraction，ScanningElectronicMicroscope，InfraredAbsorptionSpectroscopy，ThermogravimetricAnalysisandDifferentialThermalAnalysis，GasAdsorptionMethodandChemicalAnalysis．Intheprocessofcoordinationprecipitation，Accordingtothelawofcons

4、ervationofmassandlawofsimultaneousequilibrium，themathematicsmodelofCu+-NH3-N时一C2042--n20thermodynamicequilibriumsystemisestablished，andthecorrespondinglogarithmsconcentrationofmetalions—pHvaluediagramsarealsodrawn．Basedonthesediagrams，therangeofpHvalueinthecoordinatio

5、nprecipitationprocessisdetermined．Withtheuseofsolublecoppersalt，ammoniumoxalateandammoniaasrawmaterials，theeffectsofanions，excesscoefficientofC204厶，chargingmode，reactiontemperature，originalCuz十concentration，pHvalue，additionagentsanddryingmodeontheparticlesizes，morphol

6、ogiesofprecursorpowdersanddepositionrateofcu十arestudiedsystemmaticallly．Theresultsshowthatonoptimumcondition：reversechargingmode，excesscoefficientofC204厶1．1，temperature50．-60。C，[Cu2+]O．4mol／L，precursorpowderswithvariousmorphologiesareproducedindividually，suchasCUC204’

7、H20platepowderwhenpH<5．5，aggregationofnoodlespowderwhosephaseiscomplexcoppersaltscontainingNH3whenpHvalueisbetween6．4--6．8androdlikepowderwhenadditionagentBisused．Inthermaldecompositionprocess，theeffectsoftemperature，timeoftemperatureriseandheatretaining，gasatmosphere

8、onparticlesizes，morphologiesandspecificsurfaceareaofcopperpowder．Atlast，thestructuresandsizedistributionsofporesofcopperpowd