ASTM D7542-2009 标准测试空气中的碳和石墨氧化法在动力学制度
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【英文标准名称】:StandardTestMethodforAirOxidationofCarbonandGraphiteintheKineticRegime
【原文标准名称】:标准测试空气中的碳和石墨氧化法在动力学制度
【标准号】:ASTMD7542-2009
【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】:D02.F0
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:活化能
【英文主题词】:activationenergy;air;carbon;graphite;kineticregime;oxidationrate;pre-exponentialfactor;standardoxidationtemperature;temperature
【摘要】:Thistestmethodcanbeusedtomeasuretherateofoxidationforvariousgradesofmanufacturedcarbonandgraphiteinstandardconditions,andcanbeusedforqualitycontrolpurposes.Thistestmethodalsoprovideskineticparameters(activationenergyandlogarithmofpre-exponentialfactor)fortheoxidationreaction,andastandardoxidationtemperature.Theresultsuniquelycharacterizetheeffectoftemperatureonoxidationratesinair,andtheoxidationresistanceofmachinedcarbonorgraphitespecimenswithstandardsizeandshape,inthekinetic,orchemicallycontrolled,oxidationregime.Thisinformationisusefulfordiscriminationbetweenmaterialgradeswithdifferentimpuritylevels,grainsize,porestructure,degreeofgraphitization,orantioxidationtreatments,oracombinationthereof.5.3Accuratelydeterminedkineticparameters,likeactivationenergyandlogarithmofpre-exponentialfactor,canbeusedforpredictionofoxidationratesinairasafunctionoftemperatureinconditionssimilartothoseofthistestmethod.However,extrapolationofsuchpredictionsoutsidethetemperaturerangewhereArrheniusplotsarelinear(outsidethekineticorchemicallycontrolledregimeofoxidation)shouldbemadewithcaution.Inconditionswhereoxidationratesbecomecontrolledbyamechanismotherthanchemicalreactions,suchasin-porediffusionorboundarytransportoftheoxidantgas,predictionofoxidationratesusingkineticparametersdeterminedwiththistestmethodmayproduceoverestimatedresults.1.1Thistestmethodcoverstherateofoxidativeweightlossperexposednominalgeometricsurfacearea,orperinitialweightofmachinedtestspecimensofstandardsizeandshape,orboth.Thetestisvalidinthetemperaturerangewheretherateofairoxidationofgraphiteandmanufacturedcarbonislimitedbyreactionkinetics.1.2Thistestmethodalsoprovidesastandardoxidationtemperature(asdefinedin3.1.7),andthekineticparametersoftheoxidationreaction,namelytheactivationenergyandthelogarithmofpre-exponentialfactorinArrheniusequation.ThekineticparametersofArrheniusequationarecalculatedfromthetemperaturedependenceofoxidationratesmeasuredoverthetemperaturerangewhereArrheniusplots(asdefinedin3.1.8)arelinear,whichisdefinedasthex201C;kineticx201D;orx201C;chemicalcontrolx201D;oxidationregime.Fortypicalnucleargradegraphitematerialsitwasfoundthatthepracticalrangeoftestingtemperaturesisfromabout500x2013;550x00B0;Cuptoabout700x2013;750x00B0;C.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:71_060_10
【页数】:12P.;A4
【正文语种】:
【原文标准名称】:标准测试空气中的碳和石墨氧化法在动力学制度
【标准号】:ASTMD7542-2009
【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】:D02.F0
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:活化能
【英文主题词】:activationenergy;air;carbon;graphite;kineticregime;oxidationrate;pre-exponentialfactor;standardoxidationtemperature;temperature
【摘要】:Thistestmethodcanbeusedtomeasuretherateofoxidationforvariousgradesofmanufacturedcarbonandgraphiteinstandardconditions,andcanbeusedforqualitycontrolpurposes.Thistestmethodalsoprovideskineticparameters(activationenergyandlogarithmofpre-exponentialfactor)fortheoxidationreaction,andastandardoxidationtemperature.Theresultsuniquelycharacterizetheeffectoftemperatureonoxidationratesinair,andtheoxidationresistanceofmachinedcarbonorgraphitespecimenswithstandardsizeandshape,inthekinetic,orchemicallycontrolled,oxidationregime.Thisinformationisusefulfordiscriminationbetweenmaterialgradeswithdifferentimpuritylevels,grainsize,porestructure,degreeofgraphitization,orantioxidationtreatments,oracombinationthereof.5.3Accuratelydeterminedkineticparameters,likeactivationenergyandlogarithmofpre-exponentialfactor,canbeusedforpredictionofoxidationratesinairasafunctionoftemperatureinconditionssimilartothoseofthistestmethod.However,extrapolationofsuchpredictionsoutsidethetemperaturerangewhereArrheniusplotsarelinear(outsidethekineticorchemicallycontrolledregimeofoxidation)shouldbemadewithcaution.Inconditionswhereoxidationratesbecomecontrolledbyamechanismotherthanchemicalreactions,suchasin-porediffusionorboundarytransportoftheoxidantgas,predictionofoxidationratesusingkineticparametersdeterminedwiththistestmethodmayproduceoverestimatedresults.1.1Thistestmethodcoverstherateofoxidativeweightlossperexposednominalgeometricsurfacearea,orperinitialweightofmachinedtestspecimensofstandardsizeandshape,orboth.Thetestisvalidinthetemperaturerangewheretherateofairoxidationofgraphiteandmanufacturedcarbonislimitedbyreactionkinetics.1.2Thistestmethodalsoprovidesastandardoxidationtemperature(asdefinedin3.1.7),andthekineticparametersoftheoxidationreaction,namelytheactivationenergyandthelogarithmofpre-exponentialfactorinArrheniusequation.ThekineticparametersofArrheniusequationarecalculatedfromthetemperaturedependenceofoxidationratesmeasuredoverthetemperaturerangewhereArrheniusplots(asdefinedin3.1.8)arelinear,whichisdefinedasthex201C;kineticx201D;orx201C;chemicalcontrolx201D;oxidationregime.Fortypicalnucleargradegraphitematerialsitwasfoundthatthepracticalrangeoftestingtemperaturesisfromabout500x2013;550x00B0;Cuptoabout700x2013;750x00B0;C.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:
【国际标准分类号】:71_060_10
【页数】:12P.;A4
【正文语种】:
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