ASTM D6185-2010 润滑脂的二元混合物的相容性评估的标准实施规程

作者:标准资料网 时间:2024-05-11 12:12:26  浏览:8348   来源:标准资料网

【英文标准名称】:StandardPracticeforEvaluatingCompatibilityofBinaryMixturesofLubricatingGreases
【原文标准名称】:润滑脂的二元混合物的相容性评估的标准实施规程
【标准号】:ASTMD6185-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.G0.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:binarymixtures;compatibility;incompatibility;lubricatinggrease;mixtures;Binarymixtures;Compatibility--petroleumproducts;Compositionanalysis--petroleumproducts;Incompatibility;Lubricatinggrease
【摘要】:Thecompatibilityofgreasescanbeimportantforusersofgrease-lubricatedequipment.Itiswellknownthatthemixingoftwogreasescanproduceasubstancemarkedlyinferiortoeitherofitsconstituentmaterials.Oneormoreofthefollowingcanoccur.Amixtureofincompatiblegreasesmostoftensoftens,sometimesexcessively.Occasionally,itcanharden.Inextremecases,thethickenerandliquidlubricantwillcompletelyseparate.Bleedingcanbesoseverethatthemixedgreasewillrunoutofanoperatingbearing.Excessivesyneresiscanoccur,formingpoolsofliquidlubricantseparatedfromthegrease.Droppingpointscanbereducedtotheextentthatgreaseorseparatedoilrunsoutofbearingsatelevatedoperatingtemperatures.Sucheventscanleadtocatastrophiclubricationfailures.Becauseofsuchoccurrences,equipmentmanufacturersrecommendcompletelycleaningthegreasefromequipmentbeforeinstallingadifferentgrease.Servicerecommendationsforgrease-lubricatedequipmentfrequentlyspecifythecaveatx2013;donotmixgreasesunderanycircumstances.Despitethisadmonition,greasemixingwilloccurand,attimes,cannotbeavoided.Insuchinstances,itwouldbeusefultoknowwhetherthemixingoftwogreasescouldleadtoinadequatelubricationwithdisastrousconsequences.Equipmentusersmostoftendonothavetheresourcestoevaluategreasecompatibilityandmustrelyontheirsuppliers.Mixingofgreasesisahighlyimprudentpractice.Greaseandequipmentmanufacturersalikerecognizesuchpracticeswilloccurdespiteallwarningstothecontrary.Thus,bothusersandsuppliershaveaneedtoknowthecompatibilitycharacteristicsofthegreasesinquestion.Therearetwoapproachestoevaluatingthecompatibilityofgreasemixtures.Oneistodeterminewhethersuchmixturesmeetthesamespecificationrequirementsastheconstituentcomponents.Thisapproachisnotaddressedbythispractice.Instead,thispracticetakesaspecification-independentapproach;itdescribestheevaluationofcompatibilityonarelativebasisusingspecifictestmethods.Threetestmethodsareusedbecausefewerarenotsufficientlydefinitive.Forexample,inonestudy,using100000-strokeworkedpenetrationforevaluation,62%ofthemixtureswerejudgedtobecompatible.Inahigh-temperaturestoragestabilitystudy,coveringabroaderspectrumofgreasetypes,onlyone-thirdofthemixtureswerecompatible.Thesestudiesuseddifferentcriteriatojudgecompatibility.Compatibilitycannotbepredictedwithcertaintyfromforeknowledgeofgreasecomposition.Generally,greaseshavingthesameorsimilarthickenertypeswillbecompatible.Uncommonly,evengreasesofthesametype,althoughnormallycompatiblewhenmixed,canbeincompatiblebecauseofincompatibleadditivetreatments.Thus,compatibilityneedstobejudgedonacase-by-casebasis.Twoconstituentgreasesareblendedinspecificratios.A50:50mixturesimulatesaratiothatmightbeexperiencedwhenonegrease(GreaseA)isinstalledinabearingcontainingapreviouslyinstalled,differentgrease(GreaseB),andnoattemptismadetoflushoutGreaseBwithGreaseA.The10:90and90:10ratiosareintendedtosimulateratiosthatmightoccurwhenattemptsaremadetoflushoutGreaseBwithGreaseA.Note18212;Somecompaniesevaluate25:75and75:25ratiomixturesinsteadof10:90and90:10ratiomixtures.But,thelattertworatios,whichareprescribedbythispractice,areconsideredmorerepresentativeoftheflushingpracticedescribedin5.3.Incompatibilityismostoftenrevealedbytheevaluationof50:50mixtures.However,insomeinstances50:50mixturesarecompatibleandmorediluteratiosareincompatib........
【中国标准分类号】:E36
【国际标准分类号】:75_100
【页数】:8P.;A4
【正文语种】:英语