关于材料表面微纳米颗粒对材料功能性影响的判定新方法克拉玛依
庆腾五金网 2022-07-28 20:18:16
关于材料表面微纳米颗粒对材料功能性影响的判定新方法
关于材料表面微纳米颗粒对材料功能性影响的判定新方法 2011年12月04日 来源: ABSTRACT《br》《br》Commonmaterialproperties(e.g.hardness,tensilemodulusandstrength,poisson?sratio)arewellknown.Ontheotherhand,propertiesofthinlayersandmicrovoluminacandiffersignificantfromthosedata,inparticularformicro/nano-particlesystems.AFMandFFMmethodsworkwithexcellentlateral,topographicandforceresolutionbutoftendonotprovidetesting-situationsclosetopracticalapplications,e.g.highpressureflatcontactwithinmicrowearandmicrofrictioninvestigations.Optimizationoffriction/wear-propertiesofmultimicro-areacontactespeciallyofrelevanceoncurvedandtopographicallystructuredsurfacesneedaccesstomeasurementtechnique,thatcoversthegapbetweenmicroandnanoscale.TheresultspresentedherearedonewiththeUST(UniversalSurfaceTester)todeterminetheinfluenceofincorporationofmicro/nano-particlesandtheirdistributiononmicroechanicalandfunctionalpropertiesofpolymermaterialsclosetothesurface.《br》1.COMPOSITEMATERIALS《br》Duringthelastdecadetherewasanincreaseintheusageofcompositematerialsevenforconsumerproducts.Themainreasonforthisisthebroadrangeofmechanicalpropertieswhichcanbereached.Tailor-madepropertiesarepossiblefornearlyeachapplication.Inalotofcasescarbonisusedastheappropriatefiller.Carbonblackisusedforrubberwhereascarbonfibresareusedforoptimizingmechanicalpropertiesliketheyoung’smodulus,tearstrengthandwearresistance.Eventhedynamicalpropertiesofcomposite《br》materialsarebetter.《br》2.NANO-ANDMICROCOMPOSITEMATERIALS《br》Anotherincreaseinpropertiesispossiblebyusageofmicro-ornanoparticles.Forexamplecarbonshowsawholefamilyofunusualsp?-hybridizedmodificationslikefullerenes[1]andcarbonnanotubes[2].Carbonnanotubesshowextremelyhighstabilityalsoathightemperatures.Alotofinterestingapplicationsarepossiblebyusingnanotubesforreinforcement[3].《br》Table1showsthepropertiesoftypicalfibresincomparisontocarbonnanotubes[4].《br》“Table1.TypicalPropertiesoffibres.”《br》Propertycarbonfibrecarbonnanotube《br》Young’sModulus(GPa)2301000《br》Tearstrength(GPa)430《br》Length/Diameterratio《100》1000《br》3.SURFACEPROPERTIES《br》Asmentionedmicro-andnanoparticlesareusedforreinforcementofthematerial.Inalotofcasesthebulkpropertieslikemodulusarenotsoimportant.Functionalsurfacepropertieslikewearorscratchresistanceareofmoreimportanceinsomeapplications.Besidesthetechnicaladvantagethereisanimportantreasonfortheproducertoconcentrateonsurfaceproperties.《br》Theappearanceofasurfaceletacustomerjudgethevalueoftheproduct.Thereforeitisnecessarytoimprovethesurfaceresistanceovertime.Daimler-Chryslerisusinganewdevelopednanopainttoimprovescratchresistanceoftheirautomobiles[5].Thenew40μmthicklacquerfinishincludesceramicparticleswithadiameterof20nm.Figure1showstheeffectofnanofillersonthescratchbehaviourofpolymers.《br》《br》《br》Fig.1.Scratchonanepoxywithandwithoutnanofillers[6].《br》Theuseoflacquerorspecialcoatingsimprovethesurfacepropertieslikeelasticity,hardness,frictionwithoutusingabigamountofmaterial.environmentalresistanceandchemomechanicalresistancearealsoimproved.《br》《br》4.MICROSTRUCTUREANALYSIS(MISTAN?)《br》AllmeasurementsaredonewithanUniversalSurfaceTester(UST?)whichisanewandpatentedmeasuringandtestingdeviceforcontinuouslydeterminingthedeformationbehaviourofamaterialinaregionnearitssurface.TheUSTyieldsmeasuredvaluesof:permanent,plastic,elastic,viscoelasticandtotaldeformation,microhardness,hardnessstructure,abrasionandscratchresistance,creepingandrelaxation,roughness,hapticandsoftness,cuttingandpiercingresistance,thicknessandstructureoflayersandofmicrofriction.Allthisvaluesareobtainedwithahighprecisionwithonlyonesingleinstrument.Whereasexistingprocedures,e.g.hardnessmeasurements,canonlycarryoutpointbypointmeasurements,theUSTrecordscontinuouslythematerialpropertiesalongthesurface.Ifrequired,theroughnessparametersaredeterminedfromthesurfaceprofilesaccordingtotheDINorISOstandardsdependingontheusedtipgeometryand&
- 最火Noranda公司暂停智利铝厂开发项目调节球阀加热板喷嘴万能插座资兴Rra
- 最火西安总投资2620亿元重点项目集中开工板热压机纺机配件金属环切刀洗涤机Rra
- 最火北京市最新锡价格行情2011年8月26日表面张力仪福安绝缘端子热量表信号转换器Rra
- 最火15日1145衡水市场镀锌管价格行情钣金模具非标刀具金属切割机切脚机铣刀Rra
- 最火俄铝Rusal每月花50万美元维护电极夹怀化模型设计陶瓷轴承直流马达Rra
- 最火积极进取勤奋耕耘电控柜环垫片磨边机特种变压器直线轴承Rra
- 最火2018年09月28日今日氧化钐行情查询传感系统管状电机连接片手用丝锥印染胶辊Rra
- 最火集世界一流设备于一身魏桥推动铝产业向精深电缆导体缓冲器磨辊提升机植绒机Rra
- 最火3日1730岚山港港口铁矿石价格行情除污机刮泥机立式注塑机手动喷雾器音频连接器Rra
- 最火忠旺工业强基工程项目顺利通过验收德令哈海绵机械铝壳电阻送风管扎线带Rra
- 最火中国17月铜产量同比增加116电子天平激光器抛物面天线涂胶机铸钢闸阀Rra
- 最火通润铝材围绕中心抓好党建电子五金激光切割刨床涂装线铸铝Rra