预浸料制造技术(Hexcel)

PrepregTechnologyHEXCELCOMPOSITESPrepregshavehadaconsiderableimpactontheevolutionofmaninthelate20thcentury.Usedinallaerospaceprogrammesworldwide,theyarealsoenablinganewgenerationofhighspeedtrainsandfastshipstobecomerealityratherthanadesigner'sdream.Manyindustriesarejustdiscoveringthebenefitsofthesefibre-reinforcedcompositesoverconventionalmaterials.Thisguidesetsouttoremovesomeofthemystificationsurroundingprepregs,byexplainingthetechnologyinvolved.Wehavepioneeredthedevelopmentofprepregsforover60years.ThetrademarkHexPly®isrenownedinaerospaceandotherhighperformanceindustries.PublicationNo.FGU017b®HexcelRegisteredTrademark©HexcelCorporationMarch20051PREPREGTECHNOLOGYPREPREGTECHNOLOGYPageINTRODUCTIONA-Maintechnologiesforhighperformancecomposites...............................................................................................3B-Whyusecomposites?.............................................................................................................................................4C-Whatisaprepreg?..................................................................................................................................................4FIBREANDFABRICPROPERTIESA-Whatarethefibreproperties?.................................................................................................................................5B-Whatarethedifferentstylesoffabrics?..................................................................................................................6C-Whatarethemainfactorsaffectingthechoiceofreinforcement?...........................................................................7MATRIXPROPERTIESA-Whatistheroleofthematrix?.................................................................................................................................8B-Whatarethepropertiesofdifferentthermosetmatrices?......................................................................................9C-Howdodifferentmatricescompareintermsoftemperature/mechanicalperformance?........................................10PREPREGPROPERTIESA-Whyuseprepregs?................................................................................................................................................11B-Whereareprepregsused?.....................................................................................................................................11C-Howareprepregsmade?.......................................................................................................................................12PREPREGPROCESSINGA-Whatarethedifferentprepregprocessingtechniques?.........................................................................................13B-Vacuumbagorautoclave-whichprocess?...........................................................................................................14C-Whatistheroleofeachlayerinvacuumbagassembly?.......................................................................................15D-Howisvacuumbagandautoclaveprocessingcarriedout?..................................................................................16E-Whatarethemainautoclaveandvacuumbagprocessingparameters?...............................................................18F-Whatarethebestprocessingmethodsforthickerindustrialcomponents?............................................................19G-Whatisthebestcurecycleforthickercomponents?.............................................................................................19H-Whatisaprepregsandwichconstruction?.............................................................................................................20I-Whatarethepropertiesofasandwichconstruction?..............................................................................................20J-Howisasandwichconstructionproduced?............................................................................................................21PROPERTIESOFFIBRE-REINFORCEDCOMPOSITESA-Whatarethecharacteristicsofacompositematerial?...........................................................................................22B-Whatphysio/chemicaltestsaremadeonprepregsbeforeandaftercure?............................................................23C-Howarecompositestested?..................................................................................................................................24PREPREGSTORAGEANDSAFETYPRECAUTIONSA-Howshouldprepregsbestored?...........................................................................................................................27B-Whathealthandsafetyprecautionsshouldbetakenwhenhandlingprepregs?....................................................27APPENDIXI-CALCULATIONSA-Theoreticalcalculationsofbleederpliestomakeacompositelaminateofselectedfibrevolume..........................28B-Calculationofcuredplythickness,fibrevolumeandcompositedensity.................................................................29C-Choiceofpr