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几种常用的粉体粒度测试方法 Title:AnOverviewofCommonlyUsedMethodsforParticleSizeAnalysisofPowders Introduction: Particlesizeanalysisofpowdersisakeyparameterthatinfluencestheperformanceandqualityofvariousindustrialprocesses.Testingtheparticlesizedistributionisessentialforprocessoptimization,qualitycontrol,andmaterialcharacterization.Thispaperprovidesanoverviewofsomecommonlyusedmethodsfordeterminingtheparticlesizeofpowders.Themethodscoveredincludesieving,sedimentation,laserdiffraction,microscopy,anddynamiclightscattering. 1.Sieving: Sievingisoneoftheoldestandsimplestmethodsforparticlesizeanalysis.Inthismethod,asampleispassedthroughaseriesofsieveswithdifferentmeshsizes.Theparticlesareretainedonthesievesandtheirmassorweightpercentageisrecorded.Theresultsarethenusedtocalculatetheparticlesizedistributionbyplottingacumulativeparticlesizedistributioncurve.Sievingisawidelyusedmethodforcoarsepowderswithparticlesizeslargerthan45μm. 2.Sedimentation: Sedimentationmethods,suchasthehydrometermethodandthepipettemethod,relyontheprinciplesofgravitysedimentation.Inthehydrometermethod,asampleisdispersedinaliquidmediumandallowedtosettleundergravity.Thesettlingvelocityismeasuredusingahydrometer,andtheparticlesizedistributioniscalculatedbasedonStokes'law.Thepipettemethodinvolveswithdrawingaknownvolumeofsettledparticlesfromthebottomofasedimentationcolumnandanalyzingthem. 3.Laserdiffraction: Laserdiffractionisawidelyusedandhighlyaccuratemethodforparticlesizeanalysis.Itisbasedontheprinciplethatwhenalaserbeampassesthroughasuspensionofparticles,theintensityoflightscatteredbytheparticlesisinverselyproportionaltotheirsize.Bymeasuringthescatteredlightatvariousangles,theparticlesizedistributioncanbedetermined.Laserdiffractionissuitableforawiderangeofparticlesizes,fromsub-micrometertoseveralmillimeters. 4.Microscopy: Microscopytechniques,suchasopticalmicroscopyandelectronmicroscopy,providedirectvisualinformationaboutparticlesizeandshape.Opticalmicroscopyinvolvesmagnifyingthesamplesandmeasuringthedimensionsofindi