Mullite Based Oxidation Protection for

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1、JournaloftheEuropeanCeramicSociety18(1998)2351±2364#1999ElsevierScienceLimitedPrintedinGreatBritain.AllrightsreservedPII:S0955-2219(98)00242-80955-2219/99/$ÐseefrontmatterMulliteBasedOxidationProtectionforSiC±C/CCompositesinAiratTemperaturesUpto1900KH.Fritze,a*J.Jojic,aT.Witke,bC.Ru

2、Èscher,cS.Weber,dS.Scherrer,dR.Weiû,eB.SchultrichbandG.BorchardtaaInstitutfuÈrAllgemeineMetallurgieandSFB180,TechnischeUniversitaÈtClausthal,Robert-Koch-Straûe42,D-38678Clausthal-Zellerfeld,GermanybFraunhofer-InstitutfuÈrWerkstophysikundStrahltechnologieWinterbergstraûe28,D-01277Dre

3、sden,GermanycInstitutfuÈrMineralogie,UniversitaÈtHannover,Welfengarten1,D-30167Hannover,GermanydLaboratoiredeMeÂtallurgiePhysiqueetSciencesdesMateÂriaux,EcoledesMinesdeNancy,ParcdeSaurupt,F-54042NancyCedex,FranceeSchunkKohienstotechnikGmbH,D-35339Gieûen,GermanyAbstractonoxidation.Th

4、einwarddiusionofoxygenacrosstheoutermullite-containinglayercontrolledtheForanindustrialSi±SiCcoatedC/Cmaterialkineticsofthereactionaswasdeducedfrom18O(referencematerial)thetemperaturedependenceofdiusivitymeasurementsinPLDmullitelayers.Thethelinearrateofmasslossisinterpretedinthetem-

5、calculatedoxidationratesresultingfromthediu-peraturerange773

6、O2isformedattheperaturerange1323

7、mplexcom-position.HighenergyimpactCO2laserpulses1Introduction(j=3.107Wcmÿ2)leadtomeltingandevaporationofthetargetmaterialinasinglestep.ThereforetheBecauseoftheirexcellentmechanicalpropertiesat¯uxofthemetalcomponentsisstoichiometric.hightemperatures,carbon/carboncomposites(C/Deposite

8、dgreenlayersdidnots