沉積炭含量對C-C復合材料性能影響研究.pdf

1、西北工業(yè)大學碩士學位論文沉積炭含量對CC復合材料性能影響研究姓名：張翔申請學位級別：碩士專業(yè)：化學工程指導教師：張秋禹崔紅20061208西北工業(yè)大學工程碩士學位論文ABSTRACTABSTRACTCarbon／carbon(C／C)compositematedalsareusedinaerospaceapplications11屺densificationofC／Ccompositeisaccomplishedbyintroducec

2、arbonmatrixonfilamentsubstructuresTheintreductionofcarbonmatrixintOthefiberreinforcementisaccomplishedeitherbypyrolyzinganorganicmarxorthroughchemicalvapordensification／infiltration(cvD／Cvl)Py’rocarbonobtainedbyCVD／CVIpr

3、ocesspossesexcellentpropertiessuchasgoodmeehanicaIproperties，goodwearandfrictionandantiablationpropertiesandCVIbecometheexclusivelyprocessLimitiedby饑lrrenttechniquelevelitiSdifficulttoobtainhiglldensitypurepyrocarbonmatr

4、ixC／Ccompositematerial，especiallyforlargescalethickwallcomponentSothedevelopmentofC／CcompositeathomeusuallyadoptmixingmatrixofpyrocarbonandresincarbonorpitchcarbonInthisPaperneedlednonwovencarbonfabricsofinitialdensityof

5、O5毗m’wereusedassubstrateanddensifiedbyacombinationprocessofisothermalCVIandpitchimpregnation／pressurecarbonization111edensificationcharacteristiCSofneedlednonwovencarbonfabricreinforcedC／Ccompositebychemicalyapordensifie

6、ationmethodandtheinfluenceofpyrocarboncontentonmechanicalpropertiesofC／CcompositesareinvestigatedinthisPaDcLTheresultsindicatethatdensityofthefabricatedC／CcompositeincreaseandopcnporositydecreasewiththetimeofCVIprocessTh

7、eintroductionofpyroearbonattributestotheimprovementofcompressivestrengthinZdirectionwhilethetrendywithpyrocarboncontentiSnotsignificant111eflexuralstrengthinXYdirectionofo，CcompositeincreasedwiththeCOntentofpyrocarboIl’w

8、hilethetendencyofstrengthinZdirectionisnotobviousInterlaminarshearstrengthshowsimilartendencytoflexuralstrengthTheinfluencelawhassomethingtodo、jl，iththeneedlednonwovencarbonfabricreinforcementarchitectureandtheformationp

9、rocessofpyrocarbon111einfluenceofpyrocarbonanditscontent011ablationpropertiesofneedlednonwovcncarbonfabricreinforcedcarbon／carbon(C／C)compositesWasiliVestigatedusingarcstandpointablationtestingandplasmaablationtestingmet

10、hodsTheresultsindicatedthattheintroductionofpyroearbonattributestotheimprovementofantiablationoftheobtainedC／CcompositesanditiSmoresignificantinXYdirectionthanthatinZdirectionofC／Ccompositeswhilethe仃endvwithpyrocarboncon

11、tentisnotobviousnleinfluencelawhassomethingtodowiththeneedlednonwovencarbonfabricreinforcementarchitectureandtheformationprocessofpyrocarbonKeywords：Carbon／carbon(C／C)composite；Chemicalvaporinfiltration(CⅥ)；Pyrocarbon；Me