溶膠—凝膠法快速合成碳化鋯陶瓷粉末.pdf

1、武漢理工大學碩士學位論文溶膠—凝膠法快速合成碳化鋯陶瓷粉末姓名：解晶晶申請學位級別：碩士專業(yè)：材料學指導教師：王玉成20100501武漢理工大學碩士學位論文AbstractZirconiumcarbidehavebeenputintoapplicationinthefieldssuch鷦hi曲temperaturestructuralceramics，composites，refractorymaterialsandnuclearcon

2、trollingmaterialsfortheirexcellentpropertiessuchashighmeltingpoint，hi曲bendingstrength，higllhardness，superthermalconductivity，electricalconductivityandcapabilityofneutroncontrolling，whichmakesitbecometheresearchfocusofcer

3、amicmaterialsinrecentyearsAsitshi曲strength，highhardness，smallneutronabsorptioncrosssection，lowdamageunderirradiation，zirconiumcarbideisthebestpotentialcandidateforthecoatinglayeroftheTriso—coatedfuelparticlesWepreparedun

4、iformandbetterhighperformancezirconiumcarbideprecursorbycontrollingthecondtionsofthehydrolysisandcondensationinthesol—gelprocessingusingzirconiumpropoxideandsucroseasthemainrawmaterials，whereafter，synthesizedultra—finezi

5、rconiumcarbidepowdersusingtheSPSforthefirsttimeThesynthesisconditionparametersofprecursorandrapidsynthesisprocesswerestudiedandthesametothemechanismoffastsynthesisFocusedontheheatingtemperature，heatingrateandatmosphereon

6、thesynthesisofzirconiumcarbidepowdersTheoptimizedSPStechnicswereasfollowed：synthesistemperature：1750。C，heatingrate：100K／rninatmospherepressure：05barArpressureWhileactingastheoptimizedtechnics，theultm—fluezirconiumcarbide

7、powderwassynthesizedwithparticlesizeof200nmTherapidheatingrateandshortholdingtimeofSPSsignificantlyreducedthetimeofthesynthesisofzirconiumcarbideceramicpowders，andthefastheatingratemakesthereactantskeephighactivebeforean

8、dafterthereaction，WhichisbeneficialtothechangesbetweentheintermediateZrCxOyandthefinalproductZrC，thuseffectivelyreducingtheoxygencontentinthefinalproductanditscontentwassuccessfullycontrolledbelow1％Inadditiontherapidheat