Analysis of polyethylene-particle filled SiCN precursor and the resulting porous ceramics with emphasis on using micro computed tomography.PDF

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1、JournaloftheCeramicSocietyofJapan119[6]477-4822011PaperAnalysisofpolyethylene-particlefilledSiCNprecursorandtheresultingporousceramicswithemphasisonusingmicrocomputedtomographyThomasSCHMALZ,*JanMarcelHAUSHERR,*,**WalterMÜLLER,*TobiasKRAUS,*WalterKRENKEL,*,**RhettKEMPE***andGünterMOTZ*,³*Ce

2、ramicMaterialsEngineering,UniversityofBayreuth,D-95447Bayreuth,Germany**Fraunhofer-InstitutfürSilicatforschungISC,ProjectGroupCeramicComposite,Bayreuth,D-95448Bayreuth,Germany***InorganicChemistryII,UniversityofBayreuth,D-95440Bayreuth,GermanyPorous,polymerderivedSiCNceramicsaresynthesize

3、dfromasolidpolysilazane(PSZMS)andanultra-highmolecularweightpolyethylene(PE)assacrificialfiller.Commonanalyticalmethodsfortheinvestigationofthethermaldecompositionprocessesandtheformed(macro)porosities,suchasthermogravimetryandmercuryporosimetryrespectively,weresupplementedbymicrocomputedto

4、mography(µ-CT)measurements.Duetoitsnon-destructivenature,thismethodenablesthecomparativeanalysisofboth,theinthefirststepformedpreceramicduromers,todistinguishbetweenthedifferentpolymers,aswellastheresultingporousceramics.Theviaµ-CTdeterminedvaluesforthetwopolymerphasesaftercross-linkingarei

5、nagoodagreementwiththeusedoriginalamountsofPEandPSZMS.IncontrastthevaluesfortheporosityresultingfromthePEfillerandfortheformedSiCNceramicafterpyrolysisdifferingreaterextentduetothelimitingresolutionthatcanbeachievedbyapplyingµ-CTmeasurements.©2011TheCeramicSocietyofJapan.Allrightsreserved.K

6、ey-words:SiCNceramic,Porosity,Preceramicpolymer,Microcomputedtomography[ReceivedMarch1,2011;AcceptedApril6,2011]materialsproperties.Untilnow,onlyindirectmethods,suchas1.Introductionmercuryporosimetry,heliumpycnometryorcrosssectionsofSignificantinteresthasrecentlybeendirectedtowardtheselect

7、edareascouldbeusedtogainknowledgeoftheexistingformationofporousmaterials,whichareparticularlyusefulforpores.However,themethodofmicrocomputedtomographyapplicationsthatrequirefastandefficienttransportin,out,or(¯-CT),capableofdeterminingthevolumetricthree-dimensionalwith