【英文标准名称】:StandardPracticeforThermalDiffusivitybytheFlashMethod
【原文标准名称】:利用闪蒸法测定热扩散率的标准操作规程
【标准号】:ASTME2585-2009
【标准状态】:现行
【国别】:
【发布日期】:2009
【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】:E37.05
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:闪蒸法;红外探测器;内部热电偶;比热容;导热性;热扩散系数;瞬变温度测量;导热性/热传导率;瞬变温度;热分析(TA)
【英文主题词】:flashmethod;infrareddetectors;intrinsicthermocouples;specificheatcapacity;thermalconductivity;thermaldiffusivity;transienttemperaturemeasurements;Intrinsicthermocouples;Thermalanalysis(TA);Thermalconductance/conductivity;Therm
【摘要】:Thermaldiffusivityisanimportantproperty,requiredforsuchpurposesundertransientheatflowconditions,suchasdesignapplications,determinationofsafeoperatingtemperature,processcontrol,andqualityassurance.Theflashmethodisusedtomeasurevaluesofthermaldiffusivity,x03B1;,ofawiderangeofsolidmaterials.Itisparticularlyadvantageousbecauseofsimplespecimengeometry,smallspecimensizerequirements,rapidityofmeasurementandeaseofhandling.Undercertainstrictconditions,specificheatcapacityofahomogeneousisotropicopaquesolidsamplecanbedeterminedwhenthemethodisusedinaquantitativefashion(seeE1461,Appendix1).Thermaldiffusivityresults,togetherwithrelatedvaluesofspecificheatcapacity(Cp)anddensity(x03C1;)values,canbeusedinmanycasestoderivethermalconductivity(x03BB;),accordingtotherelationship:1.1Thispracticecoverspracticaldetailsassociatedwiththedeterminationofthethermaldiffusivityofprimarilyhomogeneousisotropicsolidmaterials.Thermaldiffusivityvaluesrangingfrom10-7to10-3m2/sarereadilymeasurablebythisfromabout75to2800K.1.2ThispracticeisadjuncttoE1461.1.3Thispracticeisapplicabletothemeasurementsperformedonmaterialsopaquetothespectrumoftheenergypulse,butwithspecialprecautionscanbeusedonfullyorpartiallytransparentmaterials.1.4Thispracticeisintendedtoallowawidevarietyofapparatusdesigns.Itisnotpracticalinadocumentofthistypetoestablishdetailsofconstructionandprocedurestocoverallcontingenciesthatmightofferdifficultiestoapersonwithoutpertinenttechnicalknowledge,ortostoporrestrictresearchanddevelopmentforimprovementsinthebasictechnique.Thispracticeprovidesguidelinesfortheconstructionprinciples,preferredembodimentsandoperatingparametersforthistypeofinstruments.1.5Thispracticeisapplicabletothemeasurementsperformedonessentiallyfullydensematerials;however,insomecasesithasshowntoproduceacceptableresultswhenusedwithporousspecimens.Sincethemagnitudeofporosity,poreshapes,andparametersofporedistributioninfluencethebehaviorofthethermaldiffusivity,extremecautionmustbeexercisedwhenanalyzingdata.Specialcautionisadvisedwhenotherproperties,suchasthermalconductivity,arederivedfromthermaldiffusivityobtainedbythismethod.1.6Theflashcanbeconsideredanabsolute(orprimary)methodofmeasurement,sincenoreferencematerialsarerequired.Itisadvisabletouseonlyreferencematerialstoverifytheperformanceoftheinstrumentused.1.7Thismethodisapplicableonlyforhomogeneoussolidmaterials,inthestrictestsense;however,insomecasesithasbeenshowntoproducedatafoundtobeusefulincertainapplications:1.7.1TestingofCompositeMaterials8212;Whensubstantialnon-homogeneityandanisotropyispresentinamaterial,thethermaldiffusivitydataobtainedwiththismethodmaybesubstantiallyinerror.Nevertheless,suchdata,whileusuallylackingabsoluteaccuracy,maybeusefulincomparingmaterialsofsimilarstructure.Extremecautionmustbeexercisedwhenrelatedproperties,suchasthermalconductivity,arederived,ascompositematerials,forexample,mayhaveheatflowpatternssubstantiallydifferentthanuniaxial.Incaseswherethepartic......
【中国标准分类号】:A42
【国际标准分类号】:17_200_10
【页数】:10P.;A4
【正文语种】:
基本信息
标准名称: | 镍铬合金化学分析方法 铬天青S 光度法测定铝量 |
中标分类: |
电工 >>
电工材料和通用零件 >>
电工合金零件 |
替代情况: | 被JB/T 6326.6-2008代替 |
发布部门: | 中华人民共和国机械工业部 |
发布日期: | 1992-06-26 |
实施日期: | 1993-01-01 |
首发日期: | 1900-01-01 |
作废日期: | 2008-09-01 |
提出单位: | 机械电子工业部上海电器科学研究所 |
归口单位: | 机械电子工业部上海电器科学研究所 |
起草单位: | 机械电子工业部上海材料研究所 |
出版社: | 机械工业出版社 |
出版日期: | 1993-01-01 |
页数: | 4页 |
适用范围
本标准规定了镍铬铁合金用铬天青S光度法测定铝量。
本标准适用于镍铬铁合金中铝量的测定。测定范围:0.050%~0.500%。
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所属分类: 电工 电工材料和通用零件 电工合金零件