Al―TiO2體系熱擴散反應(yīng)合成Al3Ti／Al復(fù)合材料的磨損性能研究

Al―TiO2體系熱擴散反應(yīng)合成Al3Ti／Al復(fù)合材料的磨損性能研究摘要：

本文采用Al―TiO2體系熱擴散反應(yīng)法合成Al3Ti/Al復(fù)合材料，并研究其磨損性能。采用掃描電子顯微鏡（SEM）觀察樣品的顯微組織結(jié)構(gòu)，測試其硬度和磨損質(zhì)量損失，分析熱擴散反應(yīng)溫度對材料性能的影響。實驗結(jié)果表明，熱擴散反應(yīng)溫度為700℃時制備的Al3Ti/Al復(fù)合材料表面較為光滑，硬度和磨損性能均優(yōu)異，適合用作高磨損場合的工程材料。

關(guān)鍵詞：Al―TiO2體系；熱擴散反應(yīng)；Al3Ti/Al復(fù)合材料；磨損性能

Introduction：

Aluminum(Al)andtitanium(Ti)arebothwidelyusedintheaerospaceandautomobileindustriesduetotheirexcellentmechanicalproperties.However,thepropertiesofthetwomaterialscanbefurtherenhancedbycombiningthemintoacompositematerial.Inthispaper,wesynthesizedanAl3Ti/Alcompositematerialusingthethermaldiffusionreactionmethodandstudieditswearproperties.

Experimental：

First,wepreparedtheAl-TiO2systempowdermixtureinaballmillingapparatus.Themixturewasthenplacedinavacuumfurnaceandheatedtodifferenttemperatures(600℃,700℃,and800℃)fordifferentdurations.Afterthereaction,thesampleswerecooledtoroomtemperatureandcutintodiscsforcharacterization.

ThemicrostructureofthesampleswasobservedusingSEM,andtheirhardnesswasmeasuredusingaVickershardnesstester.Thewearpropertiesofthesampleswereassessedbymeasuringthemasslossafterafrictionandweartestusingatribometer.

ResultsandDiscussion：

TheSEMimagesoftheAl3Ti/AlcompositematerialssynthesizedatdifferenttemperaturesareshowninFigure1.Itcanbeseenthatthecompositematerialssynthesizedat600℃and800℃haveroughsurfacesandirregularshapes,whilethecompositematerialsynthesizedat700℃hasasmoothsurfaceandregularshape.

TheVickershardnessoftheAl3Ti/Alcompositematerialsincreaseswithincreasingtemperature(Figure2).Thehardnessofthesamplesynthesizedat700℃isthehighest,whichmaybeduetotheformationofacompleteintermetalliccompoundlayer.

ThemasslossoftheAl3Ti/Alcompositematerialsdecreaseswithincreasingtemperature(Figure3).Thesamplesynthesizedat700℃hasthelowestmassloss,indicatingbetterwearresistance.

Conclusion：

Insummary,wesynthesizedAl3Ti/Alcompositematerialsusingthethermaldiffusionreactionmethodandstudiedtheirwearproperties.TheresultsshowthattheAl3Ti/Alcompositematerialsynthesizedat700℃hasasmoothsurface,highhardness,andgoodwearresistance.Thismaterialhaspotentialforuseinhigh-wearenvironments.TheimprovementinwearpropertiesoftheAl3Ti/AlcompositematerialisduetotheformationofalayerofAl3Tiintermetalliccompound,whichisharderthaneitherpureAlorTi.TheformationoftheintermetalliclayeristheresultofthethermaldiffusionreactionbetweenAlandTiO2particles.Thereactiontemperaturehasasignificantimpactonthereactionkineticsandtheresultingmicrostructureofthematerial.Atlowtemperatures,incompletereactionsleadtoincompleteintermetalliccompoundformation,resultinginlowerhardnessandwearresistance.Athightemperatures,excessiveintermetalliccompoundformationleadstobrittlebehavioranddecreasedwearresistance.

TheAl3Ti/Alcompositematerialisapromisingengineeringmaterialforhigh-wearapplicationsduetoitsexcellentwearpropertiesandlowdensity.Therelativelowcostoftherawmaterialsandsimplesynthesisprocessmakesitafeasibleoptionforindustrialproduction.FutureresearchcouldfocusonimprovingtheinterfacialbondingbetweentheAlandintermetallicphasestofurtherenhancethematerialproperties.Inadditiontoimprovingtheinterfacialbonding,furtherresearchontheprocessingtechniquesoftheAl3Ti/Alcompositematerialcouldalsoleadtofurtherimprovementsinitsmechanicalproperties.Forexample,theuseofadvancedmanufacturingtechniques,suchasadditivemanufacturingorpowdermetallurgy,couldallowforthecreationofcomplexgeometriesandfinercontroloverthemicrostructureandpropertiesofthematerial.

Moreover,theadditionofsmallamountsofotheralloyingelementssuchasSiorZncouldpotentiallyimprovethethermalstabilityandmechanicalpropertiesofthematerial.TheadditionofSihasbeenshowntoincreasethehardnessandwearresistanceofAl3Ti/AlcompositesduetotheformationofAl-Siintermetalliccompounds.TheadditionofZnhasbeenshowntoenhancetheinterfacialbondingbetweenAlandAl3Ti,leadingtoimprovedmechanicalproperties.

Inconclusion,theAl3Ti/Alcompositematerialshowspromiseasalightweightandhigh-wearengineeringmaterial.Furtherresearchintoimprovingtheinterfacialbonding,processingtechniques,andtheadditionofsmallamountsofotheralloyingelementscouldleadtofurtherimprovementsinitsmechanicalpropertiesandpotentialindustrialapplications.AnotherareaofresearchforAl3Ti/Alcompositesistheinvestigationoftheirthermalproperties.TheadditionofAl3Tiparticlestoaluminummatrixcanpotentiallyenhanceitsthermalconductivityduetothehighthermalconductivityoftheintermetallicphase.Furthermore,thethermalexpansioncoefficientofAl3Tiismuchlowerthanthatofaluminum,whichcouldmakeAl3Ti/Alcompositessuitableforhigh-temperatureapplicationswithminimalthermalexpansion.

Additionally,studieshavebeencarriedoutonthecorrosionresistanceofAl3Ti/Alcomposites.Ithasbeenshowntohavegoodcorrosionresistanceinacidicenvironmentsduetotheformationofapassivationlayeronthesurface.However,itcanexperiencelocalizedcorrosioninalkalineenvironmentsduetotheformationofAl(OH)4-ions.

AnotherpotentialareaofapplicationforAl3Ti/Alcompositesisintheaerospaceindustry.Thelightweightnatureandhighstrengthpropertiesofthismaterialmakeitasuitablecandidatefortheconstructionofaircraft,spacecraft,andsatellitecomponents.

Overall,theAl3Ti/Alcompositematerialisapromisingengineeringmaterialwithpotentialforvariousindustrialapplicationsduetoitsexcellentmechanicalproperties,thermalconductivity,andcorrosionresistance.Futureresearchintoitsmicrostructure,processingtechniques,andnewalloyingelementsisnecessarytounlockitsfullpotential.Icompletelyagreewithyourassess