MA-SPS制备CoSb_,3_和RE_,x_Co_,4_Sb_,12_的热电性能及其(4)
时间:2025-07-06
时间:2025-07-06
ABSTRACT
ABSTRACT
Ihermoelectricmaterialsarethefunctionalmaterialsthatcallconvertheat
energytoelectricenergyorviseversadirectlyusingthermoelectriceffectsandhaveimmenseprospectswithmanyapplicationsinthermoelectricpowergenerationandrefrigeration.Althoughthethermoelectricmaterialswithskutteruditestructure(AB3type)havelargeSeebeckcoefficientsand
tohighermeltingpoints,theyneeddopingareorfillingwithotherelements
andthedependenceimprovetheirpropertiesduetothatwiththestilllownowofpropertiesmaterialstructuresandpreparingtechnologiesareneededtobeinvestigated.
CoSb3
andtheirandRE)cC04Sbl2(RE—rareearthelements)arechosenpreparingasstudyobjectsandtechnologies,structures,thermoelectricproperties
mechanismareinvestigatedbyadvancedwaysofhighenergymill,sparkplasmasintering(ses),X—raydiffraction,scanningelectronicmicroscope,transmittingelectronicmicroscope(TEM),electricconstantsinstrument,Laserthermalconductivityinstrumentetc.
AtfirsttheeffectsofmillingtechnologiesonphasechangesofCo—Sbbinary
resultsshowthatCoSb3powderinwereinvestigated,Experimentalmillingpowder
canbesynthesizedbymechanicalalloying(MAJaftermilledfor5hundertheconditionsofball.powderratio20:1andmillworkingvoltage1IOV.Theaverage
withbulkissizeaboveCoSb3of20~35nm.Highdensitypowdercrystalgrain
averagecrystalgrainsizelessthanlOOnmweresynthesizedsuccessfullyby
showMA.SPSforthefirsttime.Resultsthatthemechanismofpreparing
thepowdergrainsizetobefinetoMAisthatmakesbulkCoSb3nanocrystalline
nanometer
sinteringandthefast,shorttimeandlowtemperaturetechnologyandspecialmechanismofSPSrestrainthecrystalgrainfromgrowingupinsintering.ThermoelectricpropertiesofbulkCoSb3preparedbydifferenttechnologiesweresystemicallyinvestigated.Resultsshowthatdifferentpreparing
evidenteffectsontechnologieshavenothermoelectricthepropertiesofbulkCoSb3sampleswhichshow
withcharacteristicsoftypicalsemiconductorelectricitythattlleresistivitydecreases
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