CoSb-,3-納米熱電材料的制備與性能研究.pdf

1、武漢理工大學(xué)碩士學(xué)位論文CoSb納米熱電材料的制備與性能研究姓名：余柏林申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：唐新峰20040501AbstractInordertomakethermoelectricgenerationsystempracticable，highperformancethermoelectricmaterialshouldbedevelopedAtpresent，inallofthemiddletemperatur

2、ethermoelectricmaterials，PbTeisusedthemostwidelybutithasaseverepollutiontoenvironmentAnditsthermoelectricperformancefigure船nax_O9)isstillverylowThereforeitisnecessarytodevelopnewtypehighperformanceandenvironmentfriendlym

3、iddletemperaturethermoelectricmaterialsAsatypeofpotentiallygoodthermoelectricmaterials，CoSb3compoundswiththeskutteruditecrystalstructureMX3haveattractedattentionwidelybecauseoftheirhighcarriermobilitylargeelectricalcondu

4、ctivities，andlargeSeebeckcoefficientsHoweverthethermalconducti、rityofskutteruditeistoolarge，SO，ZTislowThereforereducingthethermalconductivityofCoSb3hasbecomedamainresearchwayatpresentInthisresearch，nanostructureCoSb3wasp

5、reparedanditsthermoelectricperformancefigureisbetterthanmicrometerstructureCoSb3CoSb3micrometerpowderhasbeensynthesizedbysolidstatereactionCoSb3nano—powderswerepreparedbyhighenergyball—millingrespectivelyTheinfluenceofma

6、ssratioofbigballsandsmallballs，millingspeedandtimeonparticlessizeofCoSb3powderwereinvestigatedInappropriateconditions，CoSb3powderswithparticlessizeof50nmwerepreparedCoSb3nanopowderswereusedasstartingmaterials，andbulkther

7、moelectricmaterialswerepreparedbySparkPlasmaSintering(SPS)WehaveinvestigatedtheinfluenceofsinteringtemperatureandsinteringtimeongrainssizeTheresultsshowthatthegrainsizeofCoSb3growswithincreasingsinteringtemperatureorsint

8、eringtimeWhensinteringtemperatureandsinteringtimeare625℃and7minrespectively，thedensenkiedbulkthermoelectricmaterialswithmeangrainssizeof100nmwerepreparedAftertestingthermalconductivity(曲，electricalconductivity(o)andSee—b