加热条件对炭泡沫材料孔结构和性能的影响

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1、第24卷第4期新型炭材料V01．24No．42009年12月NEWCARBONMATERIAI．SDec．2009ArtideID：1007-8827(2009)04-0321-06EffectofheatingconditionsonporestructureandperformanceofcarbonfoamsWANGYong—gang，MINZhen—hua，CAOMin，XUDe—ping(&hoolofChemicalandEnvironmentalEngineering，ChinaUniversityofMiningandTechnology，Beijing10

2、0083，China)Abstract：CarbonfoamswerepreparedfromARpitchinahighpressure／hightemperaturereactorunderdifferenthea—ringconditions．Theirporestructure，bulkdensity，porosity，compressivestrength，thermalconductivity，andcrystailitesizeparametersweremeasured．Foamsproducedusingalongtimeataconstantfoamin

3、gtemperatureexhibitbiggerporesize(412ILrfl)，higherporosity(83．82％)，lowerbull(density(0．34g／cm’)，highercompressivesⅡength(4．92IVIPa)，andmoreinterconnectedporesthanthatproducedinashorttimeatthesameconstantfoamingtempera-ture，whichexhibithighthermalconductivity(71．34W／(m·K))andlowinterlayerd-

4、spacing(‰)(0．33556am)afterat2800℃．Thethermalconductivityoffoamscanreachgraphitizationspecificgraphite210(W·(m·K)。1)／(g·cm。)，whichisaboutfivetimesgreaterthancopperandfourtimesgreaterthanaluminum．Keywords：Carbonfoam；Temperaturecondition；Porestructure；PerformanceCLCnumber：TQ127．1+1Docmnentcod

5、e：A1IntroductionThepropertiesofARpitcharelistedinTable1．Thesystemwaspressurizedfor2．0MPa．4．0MPa。orSincefirstappearedin1997【l⋯．carbonfoam6．OMPabyN，。whenitwasheatedtosofteningpointwi廿llli2hthermalconductivityhavebecomepopularataconstantheatingrate．thenheatingtofinaltem—intheresearchfieldofca

6、rbonmaterials，owingtoperature．Carbonfoamswereobtainedbyreleasingtheirpotentialapplication．Mostofcarbonfoamswithgasandcoolingtoroomtemperatureafterdifferentthehighthermalconductivityhavebeenproducedconstanttemperatureconditions．Allcarbonfoamsfromasyntheticmesophasepitch(ARpitch)．Be—werecarb

7、onizedat1050℃underN，andgraphitizedcauseofdifferentapplicationfields，researchershaveat2800℃underAs．puttheireffortontheeffectofpreparationconditionsTable1TheofARonporestructureandperformance【3⋯．JamespropertiespitchI(1en旧。1andhiscoworkerinvestigatedtheporestruc—n