简介：ThechemicalcompositionandmicrostructureofTibetanmicrocrystallinemagnesitewerestudiedbymeansofXRF,XRDandFESEM.Itisfoundthatthemicrocrystallinemagnesitehasuniformlydistributedgrains,mostlyintherangeof2-4μm,andtheMgOcontentis47.80%.Infusedmagnesia,thedrusesarecolorlesstransparentpericlasemegacrystswithoutimpurity,whilethecrustsandiswhite,withahighMgOcontentupto97%-99%.Thepericlasecrystalsarebig,appearingasfacedandstep-growthmorphology.Massivesecondarylongcolumnarpericlaseiscrystallized.

简介：ThechromiumoxidematerialswerepreparedusingCr2O3micropowderasmainstartingmaterial,TiO2micropowderassinteringaid,polyvinylalcoholasbinder,byaseriesofprocessessuchasslurrying,sprayinggranulation,machinemouldingandcoldisostaticpressing,andfiringat1500℃for3hinair(oxygenpartialpressurewas2.1×104Pa),industrialnitrogen(oxygenpartialpressurewas1×103Pa),purenitrogen(oxygenpartialpressurewas10Pa),highpuritynitrogen(oxygenpartialpressurewas0.1Pa),andcarboncakeembeddedatmosphere(oxygenpartialpressurewas2.3×10-12Pa).EffectsofoxygenpartialpressuresonthesinteringbehaviorofCr2O3materialswereinvestigated.Theresultsshowthat(1)for3wt%TiO2-dopedspecimens,thereisasubstantialdependenceofsinteringonoxygenpartialpressure(0.1Pa-2.1×104Pa),andthebulkdensityincreasesandapparentporositydecreaseswithoxygenpartialpressuredecreasing;(2)eveniftheoxygenpartialpressureis0.1Pa,thespecimenwithoutTiO2cannotreachdensificationsintering;(3)underverylowoxygenpartialpressureofcarbonembeddedatmosphere,Cr2O3materialscontainingTiO2ornotcanattaindensification.

简介：Rheologyofcastablesisgreatlyaffectedandcontrolledbyrheologicalbehavioroftheirmatrix.Inthiswork,therheologicalpropertiesofbauxite-basedcastablematrixhavebeenstudied.Theeffectsofsuper-finesilicaandaluminaaddition,water/cementratio,dispersantsandbauxiteparticle-sizeonviscosity,shearrateandshearstressoftheslurrieshavebeeninvestigated.Basedontheseresults,therangeofoptimumcompositionofthematrixwithgoodrheologicalbehaviorhasbeenobtained.

简介：1IntroductionKyaniteisanimportantnaturallyoccurringindustrialmineralandisusedinthemanufactureofavarietyofindustrialceramicproducts;notableexamplesincluderefractoriesandporcelains.Itisahighpressurepolymorphofthealuminosilicatesofthenesosilicategroup,whichincludeskyanite,sillimanite,andandalusite.

简介：Effectsofstartingmaterialsandfourdispersants(STP,SHP,FDNandFS60)onZetapotentialandrheologicalbehaviorofaluminabasedULCcastablesmatrixwereinvestigated.Theresultsshowthat:characteristicsofsilicafumeandaluminacementsplayaveryimportantroleinZetapotentialandviscosityofsuspensionsofthecastablesmatrix;thedispersantsSTPandSHPcanchangeZetapotentialvaluesofthematrixsuspensionsremarkably;thefourdispersantscaneffectivelyimprovetherheologicalpropertiesofmatrixsuspensions.Forthepointoflowerviscosityofthematrixsuspensions,thesuitableadditionsofthethreedispersants(SHP,FDNandFS60)areabout0.2%whilethatofSTPisabout0.3%.

简介：Aluminamagnesiacastablecruciblespecimenswerepreparedusingtabularcorundum(≤5mm),fusedmagnesiapowder(≤0.088mm),fusedspinelpowder(≤0.044mm),andα-Al2O3micropowder(d50≤0.7μm)asmainstartingmaterials,batching,mixing,shaping,anddrying.Slagresistancewasdeterminedbystaticcruciblemethodat1600℃for3hadoptingtwoladleslagswithdifferentbasicities(3.40and1.03).Thecorrosionandpenetrationindexesandmicrostructurecharacteristicsofthespecimensafterslagresistancetestwereanalyzedtostudythecorrosionbehaviorsofthetwoslagstoaluminamagnesiacastables.Theresultsshowthatthecorrosionofthelowbasicityslagtoaluminamagnesiacastablesismuchmoreseriousthanthatofthehighbasicityslagforthattheirreactionswithcastablesformdifferentproducts;forthelowbasicityslag,themulti-phasecoexistenceofCA6andcompoundsofCaO-Al2O3-SiO2inthematerialstogetherwithvolumeexpansioncausedbytheformationofCA6intensifytheslagcorrosionandpenetration;forthehighbasicityslag,thereactionbetweenslagandcastablesgeneratesaCA2denselayerandalargeamountofin-situMAintheinterface,reducingtheslagcorrosiontothematerialseffectively.

简介：Theinterrelationofvariousfactorsaffectingthemechanicalstrength,thethermalshockresistivityandcreepdeformationofslabinasimplesettingconditionofthefiringoftablewarearediscussed,Theconrolofparametersinfavourofthedesiredperformanceoftheslabispropsed.

简介：HightemperatureoxidationbehavioroftwokindsofnitridebondedSiCbasedrefractorieswasinvestigatedat11001500℃bymeansofX-raydiffractometer,scanningelectronicmicroscopyandthermogravimetry.Theresultsshowthat:(1)withthetemperatureincreasing,theoxidationmassincrementrateofthespecimenincreasesfirstandthendecreases,andoxidationpassivationoccurs;(2)theoxidationresistanceofSiAlONbondedSiCrefractoriesissuperiortothatofSi3N4bondedSiCrefractories;(3)hightemperatureoxidationresultsintheincreaseofcompressivestrengthatroomtemperatureofSiCbasedrefractoriescomparedwithspecimenbeforeoxidation;thecompressivestrengthofSiAlONbondedSiCspecimensoxidizedathightemperaturesdecreaseswiththeincreaseofthetemperatureasaresultofformationandburstofsurfacebubble,whilethedecreaseofcompressivestrengthofSi3N4bondedSiCspecimensoxidizedathightemperaturesisowingtotheincreaseoftheconsistencyofnet-likecrackassociatedwithcristobalitetransformationduringcooling.

简介：Lowcement(LC)andultra-lowcement(ULC)bauxite-SiCcastablesareimportantandhighperformancemonolithicrefiactoriesandtheyhavebeenwidelyusediniron-makingandincineratorlinings.Inthiswork,rheo-logicalbehaviorofLCandULCbauxite-basedSiC-contain-ingcastableshasbeenstudied,includingtheeffectsofSiCcontentandcementcontentonrheologicalpropertiesofthecastables.TheresultsshowthatwithanincreaseofSiCandcementcontent,rheologicalpropertiesofthecastablesdeteriorate.Ontheotherhand,moderateamountsofSiC(4%～8%)andofcalciumaluminatecement(2%～4%)haveveryslightinfluenceonrheologicalproperties,(i.e.whenthecastablesareshearedtheirtorqueandyieldtorqueonlyslightlyincreasewiththeshearingspeed).Therheologicalcharacteristicsofthecastablesfol-lowBinghamfiuidandalwaysshowshearthinningbehav-ior.

简介：YB/T384-20111ScopeThisstandardspecifiestheclassification,technicalrequirements,testmethods,qualityappraisalprocedures,packing,marking,transportation,storage,andqualitycertificateofsilicarefractorymortars.Thisstandardisapplicabletosilicarefractorymortarsforliningsilicabricks.2NormativeReferencesThefollowingdocumentsareessentialtotheapplicationofthisstandard.Fordatedreferences,onlytheeditioncitedapplies.

简介：Zirconiagraphiterefractoryisusedasacore-nozzleinthethin-stripcastingofsteel.Post-mortemanalysisofusedrefractorywasperformedinanefforttoestablishthefailuremechanism.CorrosionbehaviorwasstudiedagainstmoltensteelwithMnO-SiO2basedliquidinclusions.CorrosionofthesematerialsinvolvesdissolutionandoxidationofgraphiteinthematrixfollowedbypenetrationofliquidslagleadingtodegradationofZrO2particles.Thermodynamicequilibriumcalculationswereperformedtostudythiscorrosionmechanism.

简介：Al2O3-MgOcastableshavebeenwidelyusedforworkingliningsofsteelladleduetotheirsuperiorhotstrengthandcorrosionresistance.Inthiswork,effectsofmicrosilica,ultrafinealuminaandMgOfinesadditionsontherheologicalbehaviorofthecastableswereinvestigatedbymeansofIBBrheometerV1.0tomeasuretorque(shearstress)undervaryingshearrates.Theresultsshowthatrheologicalpropertiesofcastablesatvaryingshearratesaresignificantlyimprovedwithincreaseofmicrosilicaadditions(from1mass%to5mass%)andcorrespondingdecreaseinwateraddition;thereisonlylittlechangeinrheologicalbehaviorwithvariationofultrafinealuminaandMgOfinesadditions.Optimumultrafinealuminaandmicrosilicaadditionsarerecommendedforcastableswithgoodrheologicalbehavior.