【英文标准名称】:StandardTestMethodforMeasuringDimensionalChangesAssociatedwithProcessingMetalPowders
【原文标准名称】:与处理金属粉末相关测定尺寸变化的标准试验方法
【标准号】:ASTMB610-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:B09.02
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:absolute;dimensionalchange;compacting;comparativedimensionalchange;duesize;metalpowders;sintering;Dimensionalchange;Metalpowders;Powdermetallurgy(P/M)materials;Sintering;Size/sizedistributionanalysis
【摘要】:DimensionalChangeWhenCompactingandSinteringMetalPowders:Thedimensionalchangevalueobtainedunderspecifiedconditionsofcompactingandsinteringisamaterialcharacteristicinherentinthepowder.Thetestisusefulforqualitycontrolofthedimensionalchangeofametalpowdermixture,tomeasurecompositionalandprocessingchangesandtoguideintheproductionofPMparts.Theabsolutedimensionalchangemaybeusedtoclassifypowdersordifferentiateonetypeorgradefromanother,toevaluateadditionstoapowdermixtureortomeasureprocesschanges,andtoguideinthedesignoftooling.Thecomparativedimensionalchangeismainlyusedasaqualitycontroltesttomeasurevariationsbetweenalotorshipmentofmetalpowderandareferencepowderofthesamematerialcomposition.Factorsknowntoaffectsizechangearethebasemetalpowdergrade,typeandlot,particlesizedistribution,levelandtypesofadditionstothebasemetalpowder,amountandtypeoflubricant,greendensity,aswellasprocessingconditionsofthetestspecimen;heatingrate,sinteringtimeandtemperature,sinteringatmosphere,andcoolingrate.DimensionalChangeofVariousPMProcessingSteps:ThegeneralprocedureofmeasuringthedieoratestcompactbeforeandafteraPMprocessingstep,andcalculatingapercentdimensionalchangeisalsoadaptedforuseasaninternalprocessevaluationtesttoquantifygreenexpansion,repressingsizechange,heattreatmentchangesorotherchangesindimensionsthatresultfromamanufacturingoperation.1.1Thisstandardcoversatestmethodthatmaybeusedtomeasurethesumofthechangesindimensionsthatoccurwhenametalpowderisfirstcompactedintoatestspecimenandthensintered.1.2Thedimensionalchangeisdeterminedbyaquantitativelaboratoryprocedureinwhichthearithmeticdifferencebetweenthedimensionsofadiecavityandthedimensionsofasinteredtestspecimenproducedfromthatdieiscalculatedandexpressedasapercentgrowthorshrinkage.1.3Withtheexceptionofdensityvalues,forwhichtheg/cm3unitistheindustrystandard,thevaluesstatedininch-poundunitsaretoberegardedasthestandard.TheSIequivalentsshowninparentheses,havebeenconvertedinaccordancewithIEEE/ASTMStandardSI10,maybeapproximate,andareonlyforinformation.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H16
【国际标准分类号】:77_160
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Harmonizedsystemofqualityassessmentforelectroniccomponents.Genericspecification:fixedcapacitors
【原文标准名称】:电子元器件质量评定协调体系.总规范:固定电容器
【标准号】:BSCECC30000-1992
【标准状态】:作废
【国别】:英国
【发布日期】:1992-12-15
【实施或试行日期】:
【发布单位】:英国标准学会(BSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:L11
【国际标准分类号】:
【页数】:52P;A4
【正文语种】:英语