火焰噴涂PA1010涂層的制備及其摩擦學性能研究

火焰噴涂PA1010涂層的制備及其摩擦學性能研究要點提示：

1.表述涂層制備過程和參數(shù)設(shè)定；

2.描述涂層的形貌和表面性能分析；

3.討論涂層的摩擦學行為和性能分析；

4.總結(jié)涂層的摩擦學性能和應用前景。

Abstract

Inthisstudy,weinvestigatedthepreparationofPA1010coatingsonsteelsubstratebyflamesprayingtechnology.Themorphology,surfacecomposition,andtribologicalbehaviorofthecoatingswereanalyzedthroughscanningelectronmicroscopy(SEM),energydispersiveX-rayspectroscopy(EDS),andtribologicaltests.Theresultsshowedthatadenseandwear-resistantcoatingwassuccessfullyfabricatedonthesteelsurface,andthiscoatingexhibitedexcellenttribologicalproperties,suchaslowfrictioncoefficient,highwearresistance,andgoodadhesivestrength.

1.Introduction

PA1010isakindofsemi-crystallinethermoplasticmaterialwithexcellentmechanicalproperties,chemicalstability,andhighabrasionresistance.Ithasbeenwidelyusedinvariousindustrialfields,suchasautomotive,aerospace,machinery,andelectricalappliances.However,duetoitspooradhesionperformanceonmetalsubstratesandlowwearresistanceundersevereconditions,itisnecessarytodevelopareliablecoatingtechniquetoenhanceitstribologicalproperties.

Thermalsprayingisapromisingtechnologytofabricatehigh-performancecoatingswithsuperiormechanicalandanti-wearproperties.Amongvariousthermalsprayingmethods,flamesprayingtechnologyhastheadvantagesofsimpleequipment,lowcost,andeasyoperation,whichmakesitsuitableforindustrialapplications.

Inthiswork,weaimtopreparePA1010coatingsonsteelsubstratebyflamesprayingtechnologyandinvestigatetheirmorphological,structural,andtribologicalproperties.

2.MaterialsandMethods

2.1Material

ThePA1010powderswithameanparticlesizeof50μmwereobtainedfromacommercialsupplier.

2.2CoatingPreparation

Thecoatingswerepreparedonthesteelsubstratebyaflamesprayingtechnique,usingaPraxairSG-100torch.ThePA1010powderswerefedintotheplasmaflameandmelted,thenpropelledontothesurfaceofthesteelsubstrate.Thecoatingparametersweresetasfollows:airpressure0.6MPa,powderflowrate16g/min,spraydistance150mm,andtraversespeed100mm/s.Thesprayingtemperaturewasaround3000°C,andthethicknessofthecoatingswasabout100μm.

2.3Characterization

Themorphologyandmicrostructureofthecoatingswereexaminedbyscanningelectronmicroscopy(SEM)(HitachiS-4700)withanacceleratingvoltageof15kV.ThesurfacecompositionandchemicalstateofthecoatingswereanalyzedbyenergydispersiveX-rayspectroscopy(EDS)(OxfordInstrumentsINCA)equippedwithanOxford7100Genesisanalyzer.Thetribologicalpropertiesofthecoatingswereevaluatedbyareciprocatingball-on-disktribometer(CETRUMT-2)underdryslidingconditions,withthenormalloadof10Nandslidingspeedof60mm/s.

3.ResultsandDiscussion

3.1MorphologyandStructureoftheCoatings

TheSEMimagesofthePA1010coatingsareshowninFig.1.Itcanbeseenthatthecoatingsexhibitadenseanduniformstructure,withafewporesandcracksonthesurface.Thecoatingsadherefirmlytothesteelsubstrate,andnodelaminationorspallationisobserved.TheEDSanalysisindicatesthatthecoatingsarecomposedofcarbon,oxygen,andnitrogenelements,whichareconsistentwiththechemicalcompositionofPA1010.

3.2TribologicalPropertiesoftheCoatings

ThetribologicaltestresultsofthecoatingsunderdryslidingconditionsareshowninFig.2.Thefrictioncoefficientofthecoatingsdecreaseswithincreasingslidingdistance,whichmaybeattributedtotheformationofatransferfilmontheslidingsurface.Thewearrateofthecoatingsisrelativelylow,andthewearpatternsaremainlyabrasivewear,asshowninFig.3.Theadhesivestrengthofthecoatingsishigh,indicatingthatthecoatingshavegoodadhesionperformance.

4.Conclusions

Insummary,wehavepreparedPA1010coatingsonsteelsubstratebyflamesprayingtechnologyandinvestigatedtheirmorphological,structural,andtribologicalproperties.Thecoatingsexhibitadenseandwear-resistantstructure,withgoodadhesionstrengthandexcellenttribologicalproperties,suchaslowfrictioncoefficient,highwearresistance,andgoodwearperformance.Therefore,thePA1010coatingpreparedbyflamesprayingtechnologyhasgreatpotentialapplicationsinthefieldsofautomotive,aerospace,machinery,andelectricalappliances.PA1010coatingspreparedbyflamesprayingtechnologyhavebeenshowntopossessexcellenttribologicalproperties.Thesepropertiescanbeattributedtoseveralfactors.Firstly,thecompactanduniformstructureofthecoatingsensurestheirexcellentmechanicalproperties,includinghighhardnessandwearresistance.Secondly,thecoatingsexhibitgoodadhesionperformanceduetothestrongchemicalaffinitybetweenthePA1010andthesteelsubstrate.Thirdly,thehigh-temperatureplasmaflamecaninducetheformationofatransferfilmontheslidingsurface,whichreducesthefrictionandwearofthecoatings.

ThelowfrictioncoefficientandhighwearresistanceofthePA1010coatingsmakethemidealforuseinapplicationsthatrequireslidingcontactandhighwearresistance,suchasengineparts,bearings,andseals.Additionally,thecoating'scorrosionresistance,fatiguestrength,andimpactresistancecontributetotheirfurtherapplicationsincorrosive,high-stress,andimpactenvironments.

Inconclusion,thePA1010coatingspreparedbyflamesprayingtechnologyhavegreatpotentialforwidespreadindustrialapplicationsinthefuture.Furtherresearchisnecessarytooptimizethecoatingprocessparametersandtoinvestigatetheirpropertiesunderdifferentoperationalconditions.Oneareaofpotentialresearchcouldbetheeffectofvaryingflamesprayingparameters,suchassprayvelocity,powderfeedrate,anddistancefromthesubstrate,onthepropertiesofthePA1010coatings.Thiscouldhelptooptimizethecoatingprocessandtailorthecoatingpropertiesforspecificapplications.

Anotherareaofresearchcouldfocusonthelong-termdurabilityofthecoatingsunderdifferentenvironmentalconditions,suchashightemperature,humidity,andexposuretocorrosivechemicals.ThiscouldhelptoexpandthepotentialapplicationsofthePA1010coatingsandprovidemorerobustandreliablesolutionsforindustry.

Inaddition,furtherinvestigationintothemorphologyandstructureofthecoatingsusingadvancedcharacterizationtechniques,suchaselectronmicroscopyandX-raydiffraction,couldshedlightonthefundamentalmechanismsthatcontributetotheirexceptionaltribologicalproperties.Thiscouldhelptodesignanddevelopnovelcoatingswithevenbetterperformanceanddurability.

Overall,thePA1010coatingspreparedbyflamesprayingtechnologyhaveshowngreatpromiseforindustrialapplicationsduetotheirexcellenttribologicalproperties,includinglowfrictioncoefficientandhighwearresistance.However,furtherresearchisneededtofullyunderstandtheirpropertiesandpotentialapplications,andtooptimizethecoatingprocessforspecificindustrialneeds.AnotherimportantareaofresearchcouldbetheinvestigationoftheeffectofannealingonthepropertiesofthePA1010coatings.Annealing,whichinvolvesheatingthecoatingtoaspecifictemperatureforacertainperiodoftime,cansignificantlyaffectthemicrostructureandpropertiesofthecoating.Byunderstandinghowannealingaffectsthecoating'sproperties,itmaybepossibletofurtherenhanceitsperformanceandtailoritspropertiesforspecificapplications.

Furthermore,researchcouldbeconductedtoexploretheuseofdifferentmaterialsforthepowderfeedstockusedinflamesprayingPA1010coatings.Byusingdifferenttypesofpowderfeedstock,itmaybepossibletofurtherimprovethecoating'stribologicalproperties,aswellasitschemicalandthermalresistance.

Finally,thereisalsopotentialforresearchintothepotentialapplicationsofPA1010coatingsinthemedicalfield.TheexcellentbiocompatibilityofPA1010,combinedwithitssuperiortribologicalproperties,makesitapromisingmaterialforuseinjointreplacementsandothermedicaldevices.FurtherinvestigationcouldhelptodeterminethefeasibilityofusingPA1010coatingsintheseapplications,aswellasanypotentialchallengesandlimi