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-particle?lledSiCNprecursorandtheresultingporousceramicswithemphasisonusingmicrocomputedtomographyThomasSCHMALZ,*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)assacri?cial?ller.Commonanalyticalmethodsfortheinvestigationofthethermaldecompositionprocessesandtheformed(macro)porosities,suchasthermogravimetryandmercuryporosimetryrespectively,weresupplementedbymicrocomputedto

4、mography(μ-CT)measurements.Duetoitsnon-destructivenature,thismethodenablesthecomparativeanalysisofboth,theinthe?rststepformedpreceramicduromers,todistinguishbetweenthedi?erentpolymers,aswellastheresultingporousceramics.Theviaμ-CTdeterminedvaluesforthetwopolymerphasesaftercross-linkingarei

5、nagoodagreementwiththeusedoriginalamountsofPEandPSZMS.IncontrastthevaluesfortheporosityresultingfromthePE?llerandfortheformedSiCNceramicafterpyrolysisdi?eringreaterextentduetothelimitingresolutionthatcanbeachievedbyapplyingμ-CTmeasurements.?2011TheCeramicSocietyofJapan.Allrightsreserved.K

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

7、edareascouldbeusedtogainknowledgeoftheexistingformationofporousmaterials,whichareparticularlyusefulforpores.However,themethodofmicrocomputedtomographyapplicationsthatrequirefastande?cienttransportin,out,or(ˉ-CT),capableofdeterminingthevolumetricthree-dimensionalwith