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简介：Usingbrownfusedaluminaandtopgradebauxiteasmainstartingmaterials,ultrafinealumina,silicafume,andpurecalciumaluminatecementasbondingsystem,theeffectsofbrownfusedaluminaandtopgradebauxiteadditionsonthepropertiesandmicrostructureofzero-cementAl2O3-SiO2castablesafterdriedat110℃andfiredat1250℃for3hwerestudied.Themicrostructurewasanalyzedanddiscussed.Theresultsshowthatthehotmodulusofruptureofzero-cementAl2O3-SiO2castablesat1250℃isupto22.1MPawhenthebauxiteadditionisoptimumat12.5wt%.Themulliteformationmechanisminthiscastablesisdissolution-precipitationmechanismandthehotmodulusofruptureofthecastablesiscloselyrelatedtoin-situmulliteformation.Comparedwithbrownfusedalumina,thetopgradebauxiteismorehelpfultoin-situmulliteformationandimprovementofhotmodulusofruptureofthecastables.

简介：HostedbyTheTechnicalAssociationofRefractories,Japan,12thUnifiedInternationalTechnicalConferenceonRefractories(UNITECR)willbeheldinKyoto,JapanfromOct.31toNov.2,2011.Session

简介：AnO'-Sialon-Al2O3compositerefractorywaspreparedbyinsitureactionofSi3N4-ZrSiO4-Al2O3mixturewithfusedaluminaaggregates.Densification,insitureactionprocedureandmicrostructureofthematerialwereinvestigatedbymeansofX-raydiffraction,opticalandscanningelectronicmicroscopesandEDAX.

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简介：MoltensaltsynthesisofMgAl2O4powderfromindustrialaluminaandlightcalcinedMgOinKCl,LiCl,andKCl-LiClmedia,andtheinfluenceofKFat500-1000℃wereinvestigated.SynthesizedpowderswerecharacterizedbymeansofXRD,laserparticleanalyzer,andSEM,andthesynthesismechanismofMgAl2O4wasdiscussedaswell.Theresultsshowthat(1)themoltensaltcomposite(KCl-LiCl)ismorefavorableforthesynthesisofMgAl2O4thansinglemoltensalt(LiClorKCl),andLiClismorefavorablethanKCl;(2)KFcanacceleratetheformationofMgAl2O4anddecreaseitsformingtemperature;(3)synthesisofMgAl2O4powderinthemoltensaltswithoutKFiscontrolledby'template-growth'mechanism,butinthemoltensaltswithKF,itiscontrolledby'template-growth'and'dissolution-precipitation'mechanism.

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简介：Theroleofnano-SiO2andultra-fineboroncarbideonthepropertiesofalumina-graphitematerialswasinvestigated.Thestudyshowedthattheultra-fineboroncarbideaddedmodifiedthemicrostructureofresidualcarbonandpromotedthechemicalbondbetweenresidualcarbonfromphenolicresinandflakegraphite.Thecarbonwhitecouldstrengthentheresidualcarbonfromphenolicresin.ThesetwoadditivesimprovedthemechanicalpropertiesofAGrefractoriesatbothroomtemperatureandhightemperature,andthermalshockresistancewasimprovednoticeably.Whenthetwoadditivesweredopedtogether,carbonwhitecouldretardtheevaporationofB2O3.Thermalshockresistancewasguaranteedwithasmalleramountofultrafineboroncarbide.

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