简介：Propertiesofmagnesia-hercynitebrickwerestudied.Thecoatability,thermalshockresistance,corrosionresistancetocementclinkerandthermalconductivitywerecomparedwiththoseofmagnesia-chromebrickandmagnesia-spinelbrickusedwidelyinsinteringzoneofcementrotarykiln.Theresultshowsthatmagnesia-hercynitebrickisbetterthanmagnesia-chromebrickinthermalchockresistanceandcorrosionresistancetocementclinker,issimilartomagnesia-chromebrickandisbetterthanmagnesia-spinelbrickincoatabilityandthermalconductivity.

简介：Themechanicalpropertiesatelevatedtempera-turesofcorundum-mullitematerialsandtheeffectsofzirconiaandtitaniaadditionshavebeeninvesti-gated.Theresultsarecorrelatedwithchangesinmicrostructure,Basedontheresultsoftheseinvesti-gations,reaction-sinteredcorundum-mullite-zirco-niamaterialswithimprovedhotstrengthandther-malshockresistancehavebeendevelopedforrefractor-riesusage.

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简介：Calciumhexaluminate(CA6)wassynthesizedbymixinglight-weightcalciumcarbonateandAl2O3micropowder(calcinedα-Al2O3,activatedα-Al2O3orρ-Al2O3)accordingtothestoichimetricratioofCA6,andreactionsinteringat1200,1300,1400and1500℃for3h,respectively.Effectsofthethreealuminamicropowdersonthephasecomposition,microstructureandpropertiesofCA6wereinvestigated.Theresultsshowthat:(1)forthethreeAl2O3micropowders,thereactiontogenerateCA6inspecimensbasicallycompletesatabout1500℃;CA6generatedinallspecimensisplanar,butthearraymodesareslightlydifferent;(2)thespecimenspreparedfromcalcinedα-Al2O3orρ-Al2O3shrinkalmost,whilethespecimenspreparedfromactivatedα-Al2O3expand;(3)thecoldcrushingstrengthofthespecimenpreparedfromactivatedα-Al2O3isthehighest,reaching42.5MPawhenonlyCA6exists(afterfiringat1500℃);(4)thespecimenpreparedfromρ-Al2O3hasthelowestgenerationtemperatureofCA6andthehighestapparentporosity,reaching70.1%whenonlyCA6exists(afterfiringat1500℃);(5)thespecimenpreparedfromcalcinedα-Al2O3hasthebiggestbulkdensity.

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

简介：Forinitiativeapplicationofnon-oxidesinrefractories,itisessentialtostudythermodynamicpropertiesofnon-oxides.Thestabilityandstableorderofnon-oxidesunderoxidizedatmosphereareanalyzedfirstlyandthenanewprocess,"conversereactionsintering",isproposed.Theresultsofstudyonoxidationmechanismofsiliconandaluminumnitridesindicatethatthegaseoussuboxidescanbeproducedobservablywhentheoxygenpartialpressureislowerthan"conversionoxygenpartialpressure".Thesuboxidescanbedepositednearthesurfaceofcompositetobecomeacompactlayer.Thiscausesthematerialpossessingaperformanceof"self-impedientoxidation".MetalSiandAlarethebetteradditivesforincreasingthedensityandwidthofcompactlayerandincreasingtheabilityofanti-oxidationandanti-corrosion.ThestudyonSi3N4-Al2O3,Si3N4-MgO,Si3N4-SiCsystemsisalsoenumeratedasexamplesinthepaper.TheexperimentalresultsshowthattheconversereactionsinteringisabletomakehighperformancecompositesandmetalSiandAlnotonlycanpromotethesinteringbutalsoincreasethedensityandwidthofcompactlayer.

简介：CurrentlytheservicelifeofCDQshaftsinChinaismainlyrestrictedbythepropertiesoftheinclinedfluebricks.Inthiswork,basedonthesystematicanalysisofthedamagemechanismofinclinedfluerefractories,highperformancemullite-SiCbricksweredeveloped.Thebrickswereproducedbycorundum,andalusite,SiCandotherhighpurityrawmaterials.Metalsiliconandaluminaultramicropowderwereaddedtoformdispersionmulti-phasestructure,fortifyingthematrixandimprovingthemicrostructure.Theproductshaveexcellentpropertiessuchaslowporosity,highdensity,goodwearresistance,highrefractorinessunderload,andgoodthermalshockresistance.Theproductscanreplacetheordinarymullite-SiCbricksandobtainagoodservicelife.

简介：SeveralkindsofslidenozzleplatesuchasAl2O3-C-ZrO2,MgO,Al2O3,Spinel-CandAl2O3-CSNplateforhighoxygensteelusedinBaoSteelhavebeenanalysed,theappearanceandsizeoftheSNplateafterusinghavebeenmeasured.TheAl2O3-CSNplatehaslongerservicelifeincastinghighoxygensteel,andthewearmechanismofdifferentSNplatesisdiscussed.

简介：SinteringadditivestogelcastingSialon-SiCweredecidedbytheoptimizingexperiments.TheresultsshowthatSoalon-SiCcanbesinteredunder1450℃andsinteringtemperaturedecreasesby100℃,when2%～3%TiO2orGuangxiclayisusedassinteringadditive.

简介：Propertiesofrefractoriesaffecttheirperfor-manceanddeformationbehaviouraswellastheirultimatefailuremode,Thereforeinordrtoassessthecapabilitiesofmaterials,usedforrefractorylin-ings,inservicetheirpropertiesmustbeevaluated.Inthisworktheevaluationofsomephysicalpropertiesofcalcinedkaloin(Kibi,Ghana)aggregatere-fractorybodiesshowedanaverageporosityandspe-cificgravityof24%and2.78respectively,Anav-eragecoldcrushingstrengthof19.6MPawasalsoobtained.Thermalexpansionandbehaviourunderaconstanthotloadof196kPaalsoshowedgoodresis-tancetohightemperaturedeformation.

简介：ThepaperdescribestheeffectofadditivesAl,Si,SiCandB4ContheexpansionofMgO-ZrO2-Cmaterialafterbeingcoked.TheresultsindicatethatAlandSicannotincreaseitshotandcoldstrength.AlandSiwereoxidizedtoformAl2O3andSiO2respectively,andthenreactedwithCaZrO3orstabilizerinc-ZrO2toformcalciumaluminate,spinel(MA),dicalciumsilicate(C2S)andforsterite(M2S).Meanwhile,α-C2Swastransformedtoγ-C2Sandc-ZrO2tom-ZrO2whentemperaturechanged.AlltheabovereactionsresultedinthedecreaseoftheamountofAl4C3andSiCandtheincreaseinbulkvolume,whichcausedthestructureofMgO-ZrO2-Cmaterialdestroyed.Hence,contrarytotheMgO-Cmaterial,whenaddingAl.andSi,theMgO-ZrO2-Cmaterialwouldbestructurallydeterioratedafterheat-treatmentanditsstrengthandcorrosionresistancedecreased.

简介：ThemullitizationofandalusitefromXinjiang,ChinaandinfluenceofaggregatesonpropertiesofaluminosilicaterefractorieswerestudiedbyXRD,SEM,EDS,DSC.Itwasfoundthatmullitizationwasobviousat1400℃,butconsiderableat1500℃.TherefractorieswithcorundumaggregateshadthehighestRULandthelowestcreeprate,butrefractorieswithbauxiteaggregateshadthelowestRULandthehighestcreeprate.

简介：TherearemanyprocessestoproduceCr2O3fromchrome-ores,DifferentparticlesizerangesofCr2O3powder,finepinmentgradegreenCr2O3andcoarsemetallurgygradeblackCr2O3,aremadebydifferentprocessesinChina,GreenCr2O3assuperfineandadditionandmetallurgygradeblackCr2O3usedtosynthesizeCr2O3graincanbeappliedtorefractories.ItisverydifficultforhighpurityCr2O3tosintertodensificationandTiO2additioniscontributedtodensificationofCr2O3sinteredathightemperature,Cr2O3grainswithrelativedensityof91%-95%aregainedbysinteringCr2O3withTiO2additionandelectrofusingCr2O3rawmaterials.

简介：Theeffectofpressdirectiononthethermalexpansion,slagresistance,etc.ofpericlase-spinel-carbonbrickhasbeenstudiedinthisarticle.Theresultsshowthatthetherma1expansionrateinthedirectionparalleltothepressaxisislargerthanthatinthedirectionperpendiculartothepressaxisandtheslagresistanceinthedirectionparalleltothepressaxisismuchbetterthanthatintheperpendiculardirection.Thedirectionaldistributionofgraphiteinthespecimenisobservedwiththemicroscope.

简介：ThecomplexcoatingontheMgO-CaOclinkerwaspreparedbydippingmethodandaddingthesecondmineraltorestraintheformationandexpansionofthecracks.Meanwhile,thericrostructureandthemorphologyofthecoatingandhydrationresistanceoftheMgO-CaOclinkerwerealsoinvestigated.TheresultshowsthatthecoatingconsistsmainlyofCa2P2O7,MgOandCaCO3,itsthicknessrangesfrom5μmto20μm,andthecoatingisdenseandeven,nomicro-cracksareobserved.Also,thecoatingadherescloselytothematrix.ThehydrationresistanceoftheMgO-CaOclinkeraftertreatmentisimprovedgreatly,andthecastablespreparedwiththetreatedMgO-CaOclinkerhavebetterphysicalpropertiesthanMgOcastable.

简介：AkindofZrO2ceramicmaterialforporousmediaburnerwaspreparedbypolymericspongeprocesswithstartingmaterialsofzircon,zirconiapowder,microsilica,andballclay,andbinderofsilicasolthroughreaction-sintering.Theeffectsofmicrosilicaadditiononcoldcrushingstrengthandzirconia/zirconaddingratioonthermalshockresistancewerestudied.Theresultsshowthattheporousmediamaterialhasproperporosity,highstrength,andexcellentthermalshockresistancewhenzirconiaadditionis85%andzirconadditionis5%.Theperformanceindexesare:porosity82%,coldcrushingstrength3.1MPa,thermalshockresistancemorethan10cycles,andgoodthermalshockresistanceto1500℃flame.

简介：Theeffectsofcorundum,magnesiaandspineladditionsonrheologicalpropertiesofmatrixofbauxite-basedcastableswerestudiedusingbauxite,fusedwhitecorundum,magnesia,spinel,microsilica,ultra-fineα-Al2O3andcementasstartingmaterialsandtrimericsodiumphosphateasdispersant.Theresultsshow:(1)thematrixslurryofbauxite-basedcastablesbelongstoBinghamfluidandshowsthixotropybehavior;(2)appropriatecorundumadditionimprovesrheologicalpropertiesofthematrix;(3)magnesiaadditionisdetrimentaltomatrixrheologicalproperties;(4)spineladditionhasslightlynegativeeffectsonmatrixrheologicalproperties.

简介：Theswunggelfiberswereheatedto400℃at0.5,1,1.5,2,2.5,3and4℃·min-1ofheatingrate,respectively,andsoakedfor1h;thenheatedto600℃at3℃·min-1ofheatingrateandsoakedfor1h;atlastcalcinedat1000,1100,1200,1300,and1400℃for1h,respectively.Theaveragesinglefibertensilestrengthsoffibersaftercalciningat600℃orhighertemperaturesweredeterminedandtheirsurfacemorphologywasobserved.Theresultsshowthat:(1)whentheheatingratebelow400℃is0.5-1℃·min-1,theaveragesinglefibertensilestrengthsof95polycrystallinealuminafibersaftercalciningat600℃and1000-1100℃exceed1000and800MPa,respectively,surfaceofthefibersaftercalciningat1000-1100℃issmooth,α-Al2O3appearsat1200℃,andalargeamountofα-Al2O3formsabove1300℃;(2)whentheheatingrateexceeds3℃·min-1,thefiberspulverizeobviously.

简介：InthispaperwepresenttheresultsofstudiesonmakingMgOzirconiasinteredparts(intendedtobeusedasmeteringnozzlesincontinuouscastingofsteel)frommonocliniczirconiaandMgOpowdersviaagranulationprocess.Thepartswerepressedandsinteredunderdifferentconditions,andanalysedforphysicalproperties,microstructureandphasecomposition.WefoundastronginfluenceoftheMgOconcentrationandthesinteringcycle,especiallythecoolingrateonthethermalshockresistance.Thepaperconcludeswithrecommendationsfortheproductionofzirconiameteringnozzlesinaneconomicway.

简介：Theeffectofparticlesizedistributionofaluminahasbeeninvestigatedforsilica-freetabularaluminalowcementcastables(LCC).Threedifferentcombinationsofaluminahavebeenincludedinthematrixformulationofthecastables.Allthethreecombinationsarecomposedofabimodalreactivealuminaandafinegroundmonomodalreactivealumina.ThefirstA1andsecondA2combinationsarerespectivelycomposedofbimodalandmonomodalaluminasfromAlteo,withadifferentfine/coarseparticlesratioforthebimodalalumina.ThetwoAlteocombinationshavebeencomparedwithathirdcombinationCcomposedofabimodalcommerciallyavailablegradeandamonomodalcommerciallyavailablegrade.OptimizationofparticlesizepackinghasbeenperformedforthethreedifferentformulationsusingtheDingerandFunkmodel.Withthisoptimization,thetwoformulationsbasedonAlteomaterial(PFR,PBRandPFR40)achievethesamelevelofperformanceinapplicativetests(flowability,coldphysicalproperties,mechanicalresistance,crystallinephases,thermalshocksandcorrosion)asreferencesolutionsonthemarket.