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SiCMgO-Al2O3-SiO2Sic體系焊接和性能研究的綜述報告SiCMgO-Al2O3-SiO2SiC體系焊接和性能研究的綜述報告引言Si-richSiC-basedvacuum-bondedcompositematerialshavebeenwidelyusedinvarioushigh-temperatureapplicationsduetotheirexcellenthigh-temperatureproperties.Asthedemandforacceleratingthedevelopmentandutilizationofadvancedmaterialssuchassiliconcarbide(SiC)ceramicmatrixcomposites(CMCs)intheaerospacefieldincreases,weldingtechnologyhasbecomeoneofthekeyfactorsthatlimittheirapplication.InordertoimprovetheweldingperformanceofSiC-basedvacuum-bondedcompositematerials,extensiveresearchhasbeencarriedoutontheSiCMgO-Al2O3-SiO2SiCsystem.ThisarticleaimstoprovideacomprehensiveoverviewoftheresearchontheweldingandperformanceoftheSiCMgO-Al2O3-SiO2SiCsystem.Si-richSiC-BasedCompositeMaterialsSi-richSiC-basedcompositematerialshaveattractedextensiveattentionfortheirexcellenthigh-temperatureproperties,suchaslowthermalexpansioncoefficient,highthermalconductivity,andhighstrengthathightemperatures.SiC-basedCMCswithSi-richerinterphasesarepromisingcandidatesforhigh-temperaturestructuralapplicationsinaircraftandrocketengines.TheSi-richSiC-basedcompositematerialshavealayerstructureandarecomposedofaSiCmatrixandaSi-richinterlayer.TheSi-richinterlayerisatransitionlayerbetweenSiCandthemetalliclayer.Themorphology,composition,andthicknessoftheSi-richinterlayerarecrucialtothehigh-temperaturepropertiesofSi-richSiC-basedcompositematerials.WeldingofSiCMgO-Al2O3-SiO2SiCSystemTheweldingofSiCMgO-Al2O3-SiO2SiCsystemhasbeenstudiedbymanyresearchers.ThissystemisaSi-richSiC-basedcompositematerialandhasexcellenthigh-temperatureproperties.TheweldingperformanceofSiCMgO-Al2O3-SiO2SiCsystemismainlyinfluencedbythecompositionoftheSi-richinterlayer.TheweldingofSiCMgO-Al2O3-SiO2SiCsystemcanbedividedintothreetypes,includingTungstenInertGas(TIG)welding,Laserwelding,andElectronbeamwelding.TIGweldingisatraditionalweldingmethodforSiC-basedmaterials.TIGweldingcanproduceastrongbondbetweenSi-richSiC-basedcompositematerials.Theweldingparameters,suchastheweldingcurrent,weldingvoltage,weldingspeed,andweldingtemperaturearecrucialtotheweldingperformanceofSiCMgO-Al2O3-SiO2SiCsystem.TheSi-richinterlayercanchangeitscompositionduetothepenetrationoftheweldingheatsource.TheweldingheatcancausechemicalreactionsandphasetransformationsintheSi-richinterlayer,whichaffectthemechanicalpropertiesoftheweldedjoints.ThemicrostructureandmechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointscanbeimprovedbyproperpost-weldheattreatment.LaserweldingisanotherwidelyusedweldingmethodforSiC-basedmaterials.Laserweldinghastheadvantagesofhighpowerdensity,shortweldtime,narrowheat-affectedzone,andeasyautomation.LaserweldingcanproduceanexcellentweldedjointbetweenSi-richSiC-basedcompositematerials.Theweldingparameters,suchasthelaserpower,laserspotsize,weldingspeed,andweldingtemperaturearecrucialtotheweldingperformanceofSiCMgO-Al2O3-SiO2SiCsystem.ThemicrostructureandmechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointscanbeimprovedbyproperpost-weldheattreatment.Electronbeamweldingisahigh-energydensityweldingmethodforSiC-basedmaterials.Electronbeamweldingcanproduceadeepandnarrowweldpenetration.Electronbeamweldingisafastandefficientweldingmethod.Theweldingparameters,suchasthebeamenergy,beamcurrent,andweldingtemperaturearecrucialtotheweldingperformanceofSiCMgO-Al2O3-SiO2SiCsystem.ThemicrostructureandmechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointscanbeimprovedbyproperpost-weldheattreatment.PerformanceofSiCMgO-Al2O3-SiO2SiCWeldedJointsThemechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointsarecrucialtotheirpracticalapplications.Themicrostructure,composition,andthicknessoftheSi-richinterlayerarecrucialtothemechanicalpropertiesoftheweldedjoints.TheSi-richinterlayercanaffecttheweldingperformance,mechanicalproperties,andhigh-temperaturepropertiesoftheSi-richSiC-basedcompositematerial.ThemechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointscanbeimprovedbyproperpost-weldheattreatment.ThemicrostructureoftheSiCMgO-Al2O3-SiO2SiCweldedjointscanbeobservedbymicroscopy.ThemicrostructureoftheSiCMgO-Al2O3-SiO2SiCweldedjointsincludestheSi-richinterlayer,thereactionlayer,andthesubstrate.TheSi-richinterlayercanhaveadifferentcompositionbeforeandafterwelding.ThereactionlayerisaresultofachemicalreactionbetweentheSi-richinterlayerandtheSiCsubstrate.ThethicknessoftheSi-richinterlayerandthereactionlayercanaffectthemechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjoints.ThemechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointscanbetestedbyvariousmethods,suchasthetensiletest,compressiontest,andbendingtest.ThemechanicalpropertiesoftheSiCMgO-Al2O3-SiO2SiCweldedjointsareinfluencedbythemicrostructure,composition,andthicknessoftheSi-richinterlayer.TheSi-richinterlayercanimprovethemechanicalpropertiesofSi-richSiC-basedcompositematerialbyincreasingthetensilestrength,compressivestrength,andbendingstrength.ConclusionSiCMgO-Al2O3-SiO2SiC

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