Oxidation process of lanthanum hexaboride ceramics-中国期刊网

摘要 Oxidationprocessoflanthanumhexaboride(LaB6)ceramicpowderwasinvestigated.TheLaB6powdersampleswereheatedcontinuallyfromroomtemperatureto1473Kataheatingrateof10K/minbydifferentialscanningcalorimetry.Theoxidationtestswereconductedatdifferentexposuretemperatures.ThephasesandmorphologiesofthesamplesbeforeandafterexposurewereanalyzedbyXRDandSEM.Itwaspointedoutthatbefore1273K,LaB6hashighoxidationresistantability,whichwasduetothattheoxidelayerhinderstheoxygendiffusionfromoutertothesurfaceofLaB6grains.Theoxidelayerwascomposedofthetransitionphases,whichwerecomposedofLa2O3andB2O3formedfromtheinitialoxidation;whentheoxidationtemperatureexceeded1273K,protectivelayerwasdestroyedduetothevaporizationofliquidB2O3.BasedontheresultsofX-raydiffractionanalysis,oxidationprocessofLaB6ceramicpowdercanbedescribedasfollows:Before1273K,lanthanumborate，La(BO2)3wasformedonthesurfaceofsamples,thenlanthanumoxide(La2O3)andboronoxide(B2O3)werepresentonthesurfaceofsamplesoxidizedwhenthetemperaturereachedto1473K.

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Oxidation process of lanthanum hexaboride ceramics

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Oxidation process of lanthanum hexaboride ceramics

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