【英文标准名称】:TestMethodforMagneticPropertiesofHigh-CoercivityPermanentMagnetMaterialsUsingHysteresigraphs
【原文标准名称】:使用磁滞曲线绘制仪测试高矫顽磁力永磁材料磁性能的方法
【标准号】:ANSI/ASTMA977-1997
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:测试方法;试验方法;磁性材料;永久磁铁
【英文主题词】:testmethods;magneticmaterials;permanentmagnets
【摘要】:Thistestmethoddescribeshowtodeterminethemagneticcharacteristicsofmagneticallyhardmaterials(permanentmagnets),particularlytheirinitialmagnetization,demagnetization,andrecoilcurvesandsuchquantitiesastheresidualinduction,coercivefields,kneefield,energyproducts,andrecoilpermeability.Thistestmethodissuitableforallmaterialsprocessedintobulkmagnetsbyancommonfabricationtechnique(casting,sintering,rolling,molding,andsoforth),butnotforthinfilmsorformagnetsthatareverysmallorofunusualshape.Uniformityofcomposition,structure,andpropertiesthroughoutthemagnetvolumeisnecessarytoobtainrepeatableresults.Particularattentionispaidtotheproblemsposedbymodernmaterialscombiningveryhighcoercivitywithhighsaturationinduction,suchastherare-earthmagnets,forwhicholdertestmethods(seeTestMethodA341)areunsuitable.AnapplicableinternationalstandardisIECPublication404-5.Themagneticsystem(circuit)inadeviceormachinegenerallycomprisesflux-conductingandnonmagneticstructuralmemberswithairgapsinadditiontothepermanentmagnet.Thesystembehaviordependsonpropertiesandgeometryofallthesecomponentsandonthetemperature.Thetestsdescribedheremeasureonlythepropertiesofthepermanentmagnetmaterial.Thebasictestmethodincorporatesthemagnetspecimeninamagneticcircuitwithaclosedfluxpath.Testmethodsusingringsamplesorframescomposedentirelyofthemagneticmaterialtobecharacterized,ascommonlyusedtomagneticallysoftmaterials,arenotapplicabletopermanentmagnets.ThistestmethodshallbeusedinconjunctionwithPracticeA34.thepreferredunitsandthecorrespondingvaluesappearinginthistestmethodarecustomary(cgs-emu)units.SIunitsareindicatedinparentheses.Whennecessary,derivationsofseparateequations,conversionfactorsortheinclusionofSIvalues,orboth,inthetextoftablesisspecifiedinthetext.Thenamesandsymbolsofmagneticquantitiesusedinthistestmethod,summarizedinTable1,arethecurrentlypreferredbyU.S.industry.ThistestmethodisusefulformagnetmaterialshavingHcivaluesbetween100Oeand35kOe(8kA/mand2.8MA/m),andBrvaluesintheapproximaterangefrom500Gto20kG(50mTto2T).Highcoercivityrare-earthmagnettestspecimensmayrequiremuchhighermagnetizingfieldsthatiron-coreelectromagnetscanproduct.Suchsamplesmustbepremagnetizedexternallyandtransferredintothemeasuringyoke.Typicalvaluesofthemagnetizingfields,Hmag,requiredforsaturatingmagnetmaterialsareshowninTable1.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H21
【国际标准分类号】:29_030
【页数】:
【正文语种】:英语