ai2fb4c-ai2fai层状复合材料界面结合机理分析

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1、A1／B。C．AI／AI层状复合材料界面结合机理研宄reinforced．theflakedparticleswilldecreasetothe1east．ThehardnessandtoughnessoftheAl／B4C．A1／A1compositematerialsfirstlyincreaseswiththedecreasingofthemassfractionofB4CparticleandthenturnstodecreasewiththedecreasingofthemassfractionofB4C．W

2、henthemassfractionreaches37．5％．thehardnessandtoughnessofthematerialreachthemaximum．Usingthedropexperimentdevicetosimulatethebondingandwettingprocessoflayers．wettingtheA1／B4CcompositewitllA1-10％Sialloy，PreparingA1／B4C—A1／AImetal-ceramicmetalstratifiedcompositebys

3、emicontinuouscastingandwettingtheA1／B4CcompositewithA1一lO％Sialloy．TheprocessofA1一lO％SialloywettingtheA1／B4Ccompositecanberoughlydividedintothreestages：(1)slowspreadingstage；(2)infiltrationstage，thecontactanglechangesdramatically．(3)equilibriumstage．Slowspreading

4、stageismainlydrivenbysurfacetension．witllspreadingresistancemainlyfromtheimpactofthepoorwettabilityorAl一10％SialloyandB4Cparticlesandthesurfaceroughnessoftheboroncarbideparticles．Underthetemperatureof913K，A1willnotreactwitllB4C．thecontactangleisgreaterthan90。．The

5、wettabilityislow．BecauseofthehighroughnessofB4Cparticles，thecontactanglehysteresisphenomenonoccurs，whichmakingthemeasuredcontactangleisgreaterthanthetheoreticalvalue．Thespreadingrateisslowduringthespreadingprocess，andthereisaslowmovementoftriple-phaselineunderth

6、ewettingeffectoftheA1phasealloyliquidandmatrix．Thewholespreadingprocessisnotobvious，andsoonentersthesecondstage，inwhichthespontaneousinfiltrationoccurs．Infiltrationstageismainlydrivenbycapillaryforce，theliquidA1—10％Sialloyinfiltrateintomatrixporesspontaneously．W

7、iththedecreaseofthedroplet，thecontactanglechangedsignificantly，andfurtherpromotetheinfiltrationoccurrence．Underthecombinedactionofspreadingandinfiltration，finallyentersequilibriumstage．Thedropletscompletelywettedthematrix，andthecontactangleiszero．Inordertofurthe

8、roptimizethesemicontinuouscasting，improvingtheinterfacialbondingsituation，discussingtheimpactofB4CparticlemassfractionandthedensityofA1／B4Ccompositematerialsonwetting