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【英文标准名称】:TestMethodforDensityDeterminationforPowderMetallurgy(P/M)MaterialsContainingLessThanTwoPercentPorosity
【原文标准名称】:含低于2%孔隙率的粉末冶金材料密度测定的试验方法
【标准号】:ASTMB311-1993(2002)e1
【标准状态】:现行
【国别】:
【发布日期】:1993
【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】:B09.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:试验;碳化物;密度;烧结金属
【英文主题词】:cementedcarbides;density;hardmetals;metalinjectionmolded(MIM)parts;powdermetallurgy(P/M);powderforged(P/F)parts;powdermetallurgy
【摘要】:ForP/Mmaterialscontaininglessthantwopercentporosity,adensitymeasurementmaybeusedtodetermineiftheparthasbeendensified,eitheroverallorinacriticalregion,tothedegreerequiredfortheintendedapplication.Densityalonecannotbeusedforevaluatingthedegreeofdensificationbecausechemicalcompositionandheattreatmentaffectthepore-freedensity.Forcementedcarbides,adensitymeasurementisnormallyusedtodetermineifthereisanysignificantdeviationincompositionofthecarbidegrade.Forstraighttungstencarbide-cobaltgrades,therelationshipisstraightforward.Forcomplexcarbidegrades(forexample,gradescontainingtantalumcarbideortitaniumcarbide,orboth,inadditiontotungstencarbide-cobalt),thesituationismorecomplicated.Ifthemeasureddensityisbeyondthespecifiedlimits,thecompositionisoutsideofthespecifiedlimits.Ameasureddensitywithinthespecifiedlimitsdoesnotensurecorrectcomposition;compensationbetweentwoormoreconstituentscouldresultintheexpecteddensitywiththewrongcomposition.Densityalonecannotbeusedforevaluatingacementedcarbidegrade.1.1Thistestmethodcoversthedeterminationofdensityforpowdermetallurgy(P/M)materialscontaininglessthantwopercentporosityandforcementedcarbides.Thistestmethodisbasedonthewaterdisplacementmethod.Note18212;Atestspecimenthatgainsmasswhenimmersedinwaterindicatesthespecimencontainssurface-connectedporosity.Unsealedsurfaceporositywillabsorbwaterandcausedensityvalueshigherthanthetruevalue.Thistestmethodisnotapplicableifthisproblemoccurs.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H70
【国际标准分类号】:77_160
【页数】:4P.;A4
【正文语种】:


【英文标准名称】:FOCIS15-FiberOpticConnectorIntermateabilityStandard-TypeMF
【原文标准名称】:FOCIS15.纤维光学连接器互配性标准.MF型
【标准号】:ANSI/TIA-604-15-2003
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:ANSI
【标准类型】:()
【标准水平】:()
【中文主题词】:MF;纤维;光学连接器;纤维光学;界面
【英文主题词】:Fibreoptics;Fibres;Interfaces;MF;Opticalconnectors;Telecommunications
【摘要】:(SP-3-4931)PresentstheintermateabilitystandardforconnectorswiththecommercialdesignationMF,andisusedasanaddendumtoTIA/EIA-604.
【中国标准分类号】:M33
【国际标准分类号】:33_180_20
【页数】:
【正文语种】:英语