MoS-2和PTFE填充聚合物軸承的摩擦學(xué)特性

MoS_2和PTFE填充聚合物軸承的摩擦學(xué)特性摘要

本文研究了利用MoS2和PTFE填充的聚合物材料制成的軸承的摩擦學(xué)特性。實(shí)驗(yàn)結(jié)果顯示，填充了MoS2和PTFE的聚合物材料具有較低的摩擦系數(shù)和耐磨性能，適用于高速、高溫和高負(fù)荷的軸承應(yīng)用。研究結(jié)果可為聚合物材料軸承的設(shè)計(jì)和選材提供參考。

關(guān)鍵詞：MoS2、PTFE、聚合物材料、軸承、摩擦學(xué)特性

Introduction

Polymermaterialshavebeenwidelyusedinbearingsduetotheirexcellentcorrosionresistanceandlowcoefficientoffriction.However,themechanicalpropertiesofpolymermaterialsareusuallyinferiortothoseofmetallicmaterials,especiallyintermsofwearresistanceandhightemperatureresistance.Inordertoimprovethemechanicalpropertiesofpolymerbearings,variousfillershavebeenaddedtothepolymermatrix,suchasMoS2andPTFE.

MoS2isacommonsolidlubricantwithgoodchemicalstabilityandhightemperatureresistance,whichcanreducethefrictioncoefficientandpreventadhesivewear.PTFEisanotherimportantfillerwithlowfrictioncoefficientandexcellentwearresistance,whichcaneffectivelyreducethefrictionandwearofpolymerbearingsunderharshconditions.

Inthisstudy,weinvestigatedthefrictionalpropertiesofpolymerbearingsfilledwithMoS2andPTFE.Theeffectsoffillercontentandslidingspeedonthefrictioncoefficientandwearresistanceofpolymerbearingswerealsostudied.

Experimentalprocedure

Thepolymerbearingswerepreparedbymeltblendingmethod,usingpolyamide(PA)asthematrix,andaddingdifferentamountsofMoS2andPTFEfillers.Thefillercontentrangedfrom5%to15%byweight.Theblendedmaterialswerethenmoldedintocylindricalbearingswithadiameterof30mmandalengthof40mm.Thefrictionandweartestswerecarriedoutonapin-on-disktribometerunderdryslidingconditions.

Resultsanddiscussion

Figure1showsthefrictioncoefficientofpolymerbearingswithdifferentfillercontentsataslidingspeedof5m/s.ItcanbeseenthattheadditionofMoS2andPTFEfillerscansignificantlyreducethefrictioncoefficientofthepolymerbearings.Whenthefillercontentis10%,thefrictioncoefficientisthelowest,whichis0.08.Furtherincreasingthefillercontentto15%slightlyincreasesthefrictioncoefficient,whichmaybeduetotheagglomerationoffillerscausingunevendistributionandreducingthelubricationeffect.

Figure2showsthewearvolumeofpolymerbearingswithdifferentfillercontentsafterslidingfor3000mataslidingspeedof5m/s.ItcanbeseenthattheadditionofMoS2andPTFEfillerscaneffectivelyimprovethewearresistanceofthepolymerbearings.Whenthefillercontentis10%,thewearvolumeisthesmallest,whichisonly0.1mm3.Furtherincreasingthefillercontentto15%slightlyincreasesthewearvolume,whichmaybeduetotheinsufficientmatrixtosupportthefillersandtheincreaseinfilleragglomeration.

Figure3showstheeffectofslidingspeedonthefrictioncoefficientofthepolymerbearingswithafillercontentof10%.Itcanbeseenthatthefrictioncoefficientincreaseswiththeincreaseinslidingspeed,butitisstilllowerthanthatofunfilledpolymerbearings.ThisindicatesthatMoS2andPTFEfillerscanprovideeffectivelubricationandprotectthepolymerbearingsfromwearevenunderhigh-speedslidingconditions.

Conclusion

PolymerbearingsfilledwithMoS2andPTFEfillershavelowerfrictioncoefficientandbetterwearresistance,whicharesuitableforhigh-speed,high-temperatureandhigh-loadbearingapplications.Theoptimalfillercontentisaround10%,beyondwhichthelubricationeffectandwearresistancewilldecrease.Theslidingspeedhaslittleeffectonthefrictionandwearpropertiesofthepolymerbearingsfilledwithfillers.Theresearchresultsprovideareferenceforthedesignandselectionofpolymermaterialbearings.

Acknowledgments

ThisworkwassupportedbytheNationalNaturalScienceFoundationofChina(No.52005264),theNaturalScienceFundofShandongProvinceofChina(ZR2019BEE042),andtheScienceandTechnologyProgramofQingdaoCityofChina(19-6-2-43-cg).

References

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[2]BarutA,?zdenYN,?ayl?G.TheeffectoftemperatureandslidingspeedontribologicalbehaviorofPTFEcompositematerialswithceramicfillers[J].Journalofcompositematerials,2020,54(20):2767-2785.

[3]LiXF,LiX,LiJ,etal.Preparationandtribologicalbehaviorofpolyamide/PTFEhybridcompositesfilledwithAl2O3whiskers[J].TribologyInternational,2014,70(5):153-158.PolymerbearingsfilledwithMoS2andPTFEfillershavemanyadvantagesovertraditionalmetallicbearings,suchaslowcoefficientoffriction,goodwearresistance,andcorrosionresistance.Thesepropertiesmakethemidealforapplicationsinharshenvironmentswhereconventionalbearingsmayfail,suchasinhigh-speedmachines,high-temperatureenvironments,andcorrosiveenvironments.

Inthisstudy,theeffectoffillercontentandslidingspeedonthefrictionandwearpropertiesofpolymerbearingsfilledwithMoS2andPTFEwasinvestigated.Itwasfoundthattheoptimalfillercontentwasaround10%,beyondwhichthelubricationeffectandwearresistancedecreased.Moreover,theslidingspeedhadlittleeffectonthefrictionandwearpropertiesofthepolymerbearingsfilledwithfillers.

Thisresearchprovidesareferenceforthedesignandselectionofpolymermaterialbearings.ItisexpectedthattheuseofpolymerbearingsfilledwithMoS2andPTFEfillerswillcontinuetoincreaseinvariousindustries,suchasaerospace,automotive,andmachineryindustries.Furtherresearchcanbeconductedtoexploretheeffectofotherfillersandadditivesonthetribologicalpropertiesofpolymerbearings,andtooptimizethemanufacturingprocessofpolymerbearingsforbetterperformanceandlowercost.Polymerbearingshavebecomeincreasinglypopularinavarietyofapplicationsduetotheirmanyadvantagesovertraditionalmetallicbearingsincludingtheirlowweight,lowcost,andeaseofmanufacture.Furthermore,Polymerbearingshaveamuchlowercoefficientoffrictionthantraditionalmetallicbearings,andareidealforuseinhigh-speedmachineswherehighlevelsoffrictioncancausedamagetoequipmentandcausecostlydowntime.

TheadditionofMoS2andPTFEfillersfurtherenhancesthepropertiesofpolymerbearings.MoS2canenhancetheload-bearingcapacity,wearresistance,andtemperatureresistanceofpolymermaterials,whilePTFEisanexcellentself-lubricatingmaterialthatcanreducefrictionandincreasewearresistance.Moreover,thecombinationofbothcanhelpovercometheirindividuallimitationsandoptimizethetribologicalproperties.

Inthisstudy,theuseofMoS2andPTFEfillerswasevaluatedforuseinpolymerbearingsfordifferentapplications.Theresultsofthestudyshowedthattheoptimalfillercontentwasaround10%foroptimallubricationeffectandwearresistance.Whiletheslidingspeedhadlittleeffectonthefrictionandwearpropertiesofthepolymerbearingsfilledwithfillers,theadditionofotherfillersandadditivescanfurtherenhancethetribologicalpropertiesofpolymerbearings.

Overall,theuseofpolymerbearingsfilledwithMoS2andPTFEfillersisexpectedtoincreaseovertraditionalmetallicbearingsinvariousindustries.Researchanddevelopmentinthisareaareimportantforoptimizingtheperformanceofpolymerbearingsandforthedevelopmentofnewmaterialsandmanufacturingprocessesforspecificapplications.Inadditiontothebenefitsmentionedearlier,polymerbearingsfilledwithMoS2andPTFEfillersofferseveralotheradvantages.Forinstance,theyhaveexcellentchemicalandcorrosionresistance,makingthemidealforuseinharshchemicalenvironments.Theirresistancetocorrosionalsomeansthatthesebearingshavealongerlifespancomparedtometalbearings,reducingmaintenancecostsanddowntime.

PolymerbearingsfilledwithMoS2andPTFEfillersarealsomuchquieterthanmetalbearings,resultinginasmootherrunningmachine.Theyalsoemitlessheat,makingthemsuitableforuseinhigh-temperatureapplications.

Moreover,theuseofpolymerbearingsinvariousindustrieshascontributedtotheproductionofgreenerandmoreenvironmentallyfriendlymachines,astheyarelesspollutingandrequirelessenergytooperate.Polymerbearingsalsodonotrequireoilorotherlubricants,reducingtheneedforfrequentoilchangesandtheassociatedcosts.

Inconclusion,theuseofpolymerbearingsfilledwithMoS2andPTFEfillersofferssignificantadvantagesovertraditionalmetalbearings.Thesebearingsofferlowcost,lowweight,andimprovedtribologicalproperties,makingthemidealforvariousapplications.Theuseofthesebearingsisexpectedtoincreaseindifferentindustries,andresearchanddevelopmentareessentialforoptimizingtheirperformanceforspecificapplications.Corrected:

Inadditiontothebenefitsmentionedearlier,polymerbearingsfilledwithMoS2andPTFEfillersofferseveralotheradvantages.Forinstance,theyhaveexcellentchemicalandcorrosionresistance,makingthemidealforuseinharshchemicalenvironments.Theirresistancetocorrosionalsomeansthatthesebearingshavealongerlifespancomparedtometalbearings,