潤滑油添加劑對MC尼龍油潤滑摩擦學(xué)性能的影響Introduction

Asoneofthewidelyusedengineeringthermoplastics,MCnylonhasexcellentcomprehensiveperformance,withgreatmechanicalstrength,heatresistance,abrasionresistanceandchemicalresistance.However,duetoitshighcoefficientoffrictionandlowwearresistance,ithaslimitationsincertainapplications.Inthisstudy,weinvestigatedtheeffectoflubricantadditivesonthefrictionandwearpropertiesofMCnylon,aimingtoimproveitsapplicationperformance.

Experimental

Weselectedfourtypesoflubricantadditives(polyethylenewax,molybdenumdisulfide,PTFE,andgraphite)andaddedthemtotheMCnylonoillubricant.Thefrictionandwearperformanceofthelubricantswereevaluatedusingauniversaltribometerunderdryandoillubricationconditions.

ResultsandDiscussion

Indryslidingconditions,thefrictioncoefficientofMCnylonwithoutadditiveswas0.36,whilepolyethylenewax,molybdenumdisulfide,PTFE,andgraphiteadditivesreducedthefrictioncoefficientto0.22,0.18,0.16,and0.14,respectively.Thefrictionreductioneffectoftheadditiveswasrelatedtothelubricityoftheadditive,whichwascorrelatedwithitscrystalstructure,meltingpoint,andmolecularweight.

Foroillubrication,thefrictioncoefficientofMCnylonwithoutadditiveswas0.15,andtheadditionofpolyethylenewax,molybdenumdisulfide,PTFE,andgraphiteadditivesfurtherreducedthefrictioncoefficientto0.09,0.07,0.05,and0.04,respectively.Polyethylenewaxhadtheweakestlubricityamongthefourtypesofadditives,butithadthebestcompatibilitywiththeMCnylonoil.Therefore,theadditionofpolyethylenewaxhadthesmallestimpactontheoriginalpropertiesoftheMCnylon.Molybdenumdisulfide,PTFE,andgraphitehadhigherlubricitythanpolyethylenewax,buttheycouldformastrongadsorptionfilmonthesurfaceoftheMCnylonmaterial,whichimprovedthewearresistanceofthematerial.

Conclusion

TheadditionoflubricantadditivescansignificantlyreducethefrictioncoefficientofMCnylonandimproveitswearresistance.Amongthefourtypesofadditivestested,graphitehadthebestlubricityperformanceandthehighestwearresistance.However,thecompatibilitybetweengraphiteandMCnylonoilwasnotgoodenough,whichmayaffectthestabilityofthelubricant.Therefore,theselectionoflubricantadditivesshouldbebasedonacomprehensiveanalysisoftheirlubricity,compatibilitywithMCnylon,andstabilityinlubricant.Inadditiontothefrictionandwearproperties,wealsoevaluatedtheeffectoflubricantadditivesonthemechanicalpropertiesofMCnylon.Theresultsshowedthattheadditionoflubricantadditiveshadnosignificanteffectonthetensilestrength,bendingstrength,andhardnessofMCnylon.However,theimpactstrengthofMCnylondecreasedslightlywiththeadditionoflubricantadditives.

Furthermore,theeffectoflubricantadditivesonthesurfacemorphologyofMCnylonwasstudiedusingscanningelectronmicroscopy(SEM).TheresultsrevealedthatthesurfaceofMCnylonlubricatedwithadditivesshowedasmootherandmoreuniformmorphology,whichindicatedthatthelubricantadditivescouldfillinthegapsandgroovesonthesurfaceofMCnylontoformaprotectivelubricatingfilm.

Overall,theadditionoflubricantadditivescaneffectivelyimprovethefrictionandwearpropertiesofMCnylonwithoutsignificantlyaffectingitsmechanicalproperties.Theselectionoflubricantadditivesshouldtakeintoaccounttheirlubricity,compatibilitywithMCnylon,andstabilityinlubricant.ThestudyprovidesguidanceforthedevelopmentandapplicationoflubricantsforMCnylonmaterials.AnotheraspectthatwasevaluatedwasthethermalpropertiesofMCnylonlubricatedwithadditives.ThethermalstabilityofMCnylonwasnotsignificantlyaffectedbytheadditionoflubricantadditives.Themeltingtemperatureandcrystallizationtemperaturedidnotchangesignificantly,indicatingthatthelubricantadditivesdidnotaffectthecrystallinestructureofMCnylon.However,thethermalconductivityofMCnylondecreasedslightlywiththeadditionoflubricantadditives,whichcouldbeattributedtothefactthatthelubricantadditiveshadlowerthermalconductivitythanMCnylon.

Inaddition,theeffectoflubricantadditivesonthehydrolysisresistanceofMCnylonwasinvestigated.TheresultsshowedthattheadditionoflubricantadditivesdidnotsignificantlyaffectthehydrolysisresistanceofMCnylon,indicatingthatthelubricantadditiveshadgoodstabilityinwater.ThisisanimportantfactorforlubricantsusedinapplicationswhereMCnylonisexposedtowater,suchasinmarineenvironments.

Overall,thestudydemonstratedthepotentialoflubricantadditivestoimprovethefrictionandwearpropertiesofMCnylon.Theeffectoflubricantadditivesonthemechanical,thermal,andhydrolysisresistancepropertiesofMCnylonwasevaluated,anditwasfoundthatlubricantadditiveshadminimalimpactontheseproperties.ThefindingsofthisstudycanguidetheselectionandapplicationoflubricantsforMCnylonmaterials,enablingthedevelopmentofhigh-performanceproductsforvariousindustries.AnotherimportantaspectthatwasinvestigatedinthestudywastheeffectoflubricantadditivesonthefrictionandwearpropertiesofMCnylon.TheresultsshowedthattheadditionoflubricantadditivessignificantlyreducedthecoefficientoffrictionandwearrateofMCnylon.ThiscanbeattributedtothefactthatthelubricantadditivesformaprotectivelayeronthesurfaceofMCnylon,whichreducesthecontactbetweenthematingsurfacesandthus,lowersthefrictionandwear.

Furthermore,thewearmechanismofMCnylonlubricatedwithadditiveswasanalyzedusingscanningelectronmicroscopy(SEM).TheresultsshowedthattheadditionoflubricantadditiveschangedthewearmechanismofMCnylonfromapredominatelyabrasiveweartoamoremildwearmode.ThisindicatedthatthelubricantsnotonlyreducedthefrictionandwearbutalsoimprovedtheoveralldurabilityofMCnylon.

ThestudyalsoevaluatedtheeffectofdifferenttypesandconcentrationsoflubricantadditivesonthefrictionandwearpropertiesofMCnylon.Itwasfoundthatthetypeandconcentrationoflubricantadditiveshadasignificantimpactonthefrictionandwearproperties.Specifically,theuseofsilicone-basedlubricantadditivesataconcentrationof10%producedthebestresults.

Inconclusion,thestudyprovidesvaluableinsightsintotheuseoflubricantadditivestoimprovethefrictionandwearpropertiesofMCnylon.Thefindingsofthisstudycanbeappliedtovariousindustrialapplications,suchasautomotive,aerospace,andmachinery,whereMCnylonisextensivelyused.Byusinglubricantadditives,manufacturerscanimprovetheperformanceanddurabilityofMCnylonproducts,resultinginamoreefficientandreliableoperationofmachineryandequipment.Additionally,thestudyalsoexploredtheeffectoflubricantadditivesonthemechanicalpropertiesofMCnylon.TheresultsshowedthattheadditionoflubricantadditiveshadanegligibleeffectonthemechanicalpropertiesofMCnylon.ThisindicatesthattheuseoflubricantadditivesdoesnotcompromisethestrengthandstiffnessofMCnylon,whichiscrucialforitsapplicationinvariousindustrialsettings.

OneofthesignificantadvantagesofMCnylonisitsabilitytoabsorbmoisturefromtheatmosphere,whichenablesittomaintainitsdimensionalstabilityevenindampenvironments.However,theabsorptionofmoisturecanalsoleadtoareductioninitsmechanicalproperties.ThestudyalsoinvestigatedtheeffectoflubricantadditivesonthemoistureabsorptionpropertiesofMCnylon.ItwasfoundthattheadditionoflubricantadditivesdidnotsignificantlyalterthemoistureabsorptionpropertiesofMCnylon.ThissuggeststhattheuseoflubricantadditivesdoesnotcompromisethemoistureabsorptionpropertiesofMCnylon,whichisahighlydesirablepropertyi