Microstructural and mechanical evaluation of porous biomorphic silicon carbide for high temperature filtering applications.pdf

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1、Availableonlineatwww.sciencedirect.comJournaloftheEuropeanCeramicSociety31(2011)13251332MicrostructuralandmechanicalevaluationofporousbiomorphicsiliconcarbideforhightemperaturefilteringapplicationsM.A.Bautistaa,J.QuispeCancapab,J.MartinezFernandeza,∗,M.A.Rodríguezc,M.Singhd

2、aDpto.deFísicadelaMateriaCondensada-InstitutodeCienciadeMateriales,UniversidaddeSevilla-CSIC,Sevilla41080,SpainbBiomorphic-EBTS.L.,Sevilla,SpaincI.deCeramicayVidrio,CSIC,28049Cantoblanco,Madrid,SpaindOhioAerospaceInstitute,22800CedarPointRoad,Cleveland,OH44142,USAAvailable

3、online3August2010AbstractBiomorphicSiC(bioSiC)isalowcostSiC/Sicompositeobtainedbymeltinfiltrationofcarbonpreformsobtainedfromthepyrolysisofcelluloseprecursors.TheporosityandporesizedistributionofbioSiCcanbetailoredforspecificapplicationsbyadequateselectionofthewoodprecursor.

4、NaturalandartificialindustrialwoodswereexploredaspossiblebioSiCprecursors.Siliconwasremovedbychemicaletching.Relevantmicrostruc-turalparameterssuchasporesizedistribution,totalporosity,andpermeabilitywerecharacterized.Sincethefiltrationprocessinvolveslargepressuregradientsalo

5、ngthematerialathightemperatures,mechanicalpropertiesofporousbioSiCfromthedifferentprecursorswereevaluatedatroomtemperatureand800◦C.ThefeasibilityofporousbioSiCasafiltrationmaterialforhightemperaturegasificationprocessesisdiscussedintermsoftheseproperties.MDF-bioSiCisshowntob

6、eapromisingmaterialforsuchapplicationsbecauseofitsgoodmechanicalproperties,interconnectedporosity,poresizes,andpermeability.©2010ElsevierLtd.Allrightsreserved.Keywords:BiomorphicSiC;Porosity;Permeability;Bendingstrength;Filtering1.Introductionuseatlowtemperatureand/orambie

7、ntpressures.Themosteffi-cientwayofseparatingparticlesathightemperatureistouseHotgasclean-uptechnologyisacrucialelementofadvancedceramicfilters.Hightemperaturefiltrationsystemswhichshowcleancoalandfuelcelltechnologies,whichareprimecandi-promisingpropertiesincludesiliconcarbide

8、,siliconnitride,datesfortheelectrical-powergenerationbecauseoftheirhighceramiccomposites,