Title of article :
EffectoftemperatureongraphiteoxidationbehaviorOriginalResearchArticle
Author/Authors :
LuoXiaowei، نويسنده , , RobinJean-Charles، نويسنده , , YuSuyuan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Abstract :
ThetemperaturedependenceofoxidationbehaviorforthegraphiteIG-11,usedintheHTR-10,wasinvestigatedbythermogravimetricanalysisinthetemperaturerangeof400–1200°C.Theoxidantwasdryair(watercontent<2ppm)withaflowrateof20ml/min.Theoxidationtimewas4h.Theoxidationresultsexhibitedthreeregimes:inthe400–600°Crange,theactivationenergywas158.56kJ/molandoxidationwascontrolledbychemicalreaction;inthe600–800°Crange,theactivationenergywas72.01kJ/molandoxidationkineticswerecontrolledbyin-porediffusion;whenthetemperaturewasover800°C,theactivationenergywasverylowandoxidationwascontrolledbytheboundarylayer.DuetoCOproduction,theoxidationrateincreasedathightemperatures.Theeffectofburn-offonactivationenergywasalsoinvestigated.Inthe600–800°Crange,theactivationenergydecreasedwithburn-off.Resultsoflowtemperaturetestswereverydispersiblebecausetheoxidationbehavioratlowtemperaturesissensitivetoinhomogeneousdistributionofanyimpurity,andsomeimpuritiescancatalysegraphiteoxidation.
Keywords :
Nucleargraphite , Oxidation , HTR-10 , Thermogravimetricanalysis
Journal title :
Nuclear Engineering and Design Eslah
Journal title :
Nuclear Engineering and Design Eslah
