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1、Thethermalconductivityandmechanicalpropertiesofhighlyporouszirconiafelt/ZrO2compositesbyzirconiumoxideprecursorimpregnationJianpingAia,b,GuohongZhoua,*,ZhengjuanWanga,b,HailongZhanga,XianpengQina,b,PengLiua,ShiweiWanga,*aTheStateKeyLaboratoryofHighPerformanceCeramicsandSuperfi
2、neMicrostructures,ShanghaiInstituteofCeramics,ChineseAcademyofSciences,1295DingxiRoad,Shanghai,PRChinabUniversityofChineseAcademyofSciences,Beijing,PRChinaAbstractThevacuumpressureimpregnationmethodwasadoptedtomakebothlowthermalconductivityandhigh-temperatureresistanceporouszi
3、rconiafelt/ZrO2composites.Incorporatingzirconiafeltintoporouszirconiamatrixtoimprovethemechanicalstrength.Meanwhile,lanthanumnitrateasanadditivetoyttrium-stabilizedzirconiatoreducethethermalconductivityofthematrix.Theeffectofsinteringtemperatureoncompressivestrengthandthermalc
4、onductivitywereinvestigatedonthebasisofporosity,microstructureandcomposition.Thetetragonalphaseandthecubicphaseco-existedat1450℃,whilethecubicphasepredominatedupon1450℃aszirconiaionswerereplacedbylanthanumandyttriumions.Andtheopenporosityandsizeofsmallporesdecreasedasthesinter
5、ingtemperatureincreasedfrom1450to1600℃duetothezirconiagrainsgrewup,adecreaseofopenporosityfrom48.1%to42.5%.Comparedwithothertemperaturesinteredsamples,the1600℃-sinteredsamplesalwaysownedhigherthermalconductivityvalueof0.70~0.78W/(m•K)atlowertemperature,inversely,possessedlower
6、thermalconductivityafter800℃.1.IntroductionZirconia-basedceramicshavehighmeltingpoint,excellentmechanicalstrength,lowthermalconductivitycomparedwithotherceramics[1-3].Itisthereforeofinteresttoconsiderthemasthermalprotections.Zirconia-basedceramicsshowpromiseasthermalbarriercoa
7、tings(TBCs)[4-6].TBCsofferadvantageinthermalinsulating,however,theycannotmeetthestrengthrequirementofthermalprotectionswhichrequirenotonlylowthermalconductivitybutalsohighstrength.Therefore,itissignificanttoresearchzirconia-basedceramicsasbulkmaterialswhichmeetboththermalandme
8、chanicalrequirements.Ithasbeenconfirmedthatthermalconductivit
