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1、第14卷第1期新型炭材料Vol.14No.11999年3月NEWCARBONMATERIALSMar.1999ANTIOXIDATIONCOATINGOFCARBONMATERIALSCOUPLEDWITHSiCCONCENTRATIONGRADIENTO.Yamamoto(KanagawaInstituteofTechnology,Atsugi,24320292Japan)M.Inagaki(GraduateSchoolofEngineering,HokkaidoUniversity,Kita2ku,Sapporo,06028268Japan)ABSTRACTHig
2、hoxidationresistanceat1400℃inaflowofairwassuccessfullyobtainedbyacoatingofoxidethinfilmofeitherzircon(ZrSiO4)ormullite(3Al2O3·2SiO2)coupledwiththinlayerwithagradientofSiCconcentrationonthesurfaceofcarbonmaterial.SiCconcentrationgra2dientwasformedbyadirectdippingintoameltofSimetalat1450℃
3、.Oxidethinfilmsofzirconandmullitewereformedthroughsol2gelprocess.Thecontrolofthehydrolysisratewasakeytotheproductionofahomogeneousthinfilm.Mullitecoatingwasmoreeffectivethanzirconcoating.Theisotropichigh2densitygraphiteblockwithSiCconcentrationgradientandmullitecoatinghadenoughresistanc
4、etooxidationat1400℃inairandtoquenchingfrom1400℃toliquidnitrogentemperature.KEYWORDSAntioxidation,Carbonmaterials,SiCgradient,Zircon,Mullite1Introductiontobesolvedinordertodeveloptheapplica2tionsashightemperaturematerials.Carbonmaterials,includingcarbonöcar2Twoeffectivemethodshavebeenpro
5、2boncomposites,areimportantstructuralposed:dispersionoffineparticlesofcarbidesmaterialsparticularlyathightemperatures.andborides,suchasSiC、B4C、ZrB2、etc.,inHowever,theiruseshavebeenrestrictedtothecarbonmaterialsandcoatingofathinaninertatmosphere,becauseoftheiroxida2filmofcarbidesandoxide
6、s,suchasSiC,tionabove500℃.Therefore,theimprove2TiC2SiC,SiO2,ZrO2,etc.,onthemateri2[126]mentoftheoxidationresistanceofcarbonals.Intheformer,theimprovementofmaterialsisoneoftheimportantproblemsoxidationresistancewassupposedtoresult1stAuthorIntroduction:O.Yamamoto,male,bornin1963,PhD,Resea
7、rchInstructorofKanagawaInstituteofTechnol2ogy,hismainresearchfieldsarethepreparationofceramicfilmsandparticlesfrommetal2com2pletxsolutionandeventheantibacterial,electricalandthermodynamicalpropertiesofthesema2terials.Received:1998212209·2·新型炭材料第14卷fromtheformationofanoxidelayer
