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

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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