简介：Wearofthespenthighchromebrickinslagginggasifierwasstudied.TheresultshowsthaterosionandspallingarethemainwearmechanismofhighchromebrickandtheCaOcontentofcoalslagiscrucialtowearofhighchromebrick.

简介：Monolithicstoppersplayaveryimportantroleincontinuouscasting(shortforCC).Sometimes,thestopperslaglineisseriouslyerodedandbroken,CChastopause.Theresearchshowsthattherearethreemainreasonswhichbringsevereerosionofmonolithicstopperslagline.Firstly,muchFe_2O_3andMnOinslagreactwithcarbon(C)inthestopper,Cisgraduallyerodedanderosionresistanceofthestoppergreatlyweakens.Secondly,Fincreaseintundishcoveringfluxwillquickenerosionofthestopperslagline.Thirdly,HighLOIoftundishcoveringfluxalsomakeserosionofthestopperslaglinespeedup.Ononehand,CaCO_3intundishcoveringfluxdecomposesandbringsCO_2;ontheotherhand,mineralswithwaterintundishcoveringfluxdecomposeathightemperaturesandbringwatervapor.ThenCO_2andwatervaporreactwithCinthestopper,Cisgraduallyeroded,aggravatingtheerosion.

简介：Inthispaper,X-raydiffractogramanalysisandSEMobservationofAl4C3formedathightemperaturefromcarbon-containingrefractorieswithAlhavebeencarriedout.Aluminumaddedtocarbon-containingrefractoriesreactswithC(s)toformAl4C3(s)graduallyduringheatingfrom600℃to1200℃.ItisconsideredthattheinterlockedstructureofAl4C3platecrystalspromotestheoutstandingincreaseofhotmodulusofruptureofcarbon-containingrefractorieswithAl.TheHMORofcarbon-containingrefractoriesaddedwithAladditivefrom0to5wt％increasesby2.8timesbeingfrom6.5MPato18.2MPa.AfterathermochemicalcalculationforhydrationreactionprocessesofAl4C3andH2O(g),theequilibriumpartialpressurechartofH2O(g)inH2O-Al4C3-Al(OH)3systemvsvarioustemperatureshasbeenattained.TheH2O(g)partialpressureintheairneededfortheAl4C3hydrationreactionisnomorethan10～18atmatthetemperaturebelow120℃.Itisconsideredthattheburnedcarbon-containingrefractorieswithAlisextremelyeasytohydrateandthecrackingofburnedcarbon-containingrefractoriesisgeneratedbecausethatthehydrationexpansionis2.11timesduringtransformingfromAl4C3toAl(OH)3.ThefundamentalmeasureagainsthydrationoftherefractoriesistoinsulatetherefractoriesfromH2O(g)byvariousmeanssuchaspitchimpregnationorothersealingmaterials.

简介：Insomesteelmakingworkshops,theexistedinherentweaknessesoftraditionalcarboncontainingbrickworkinglining,suchasjointopening,verticalcrackingoflining,andexcessiveerosionofbrickedge,madeithardtosatisfythedemandsofadvancedsteelproduction.Anew-typecarbonfreecorundumspinelbrickandcastableweredevelopedbasedonthematrixoptimizedanalysis,successfullyappliedforultra-lowcarbonsteelproduction.Theadvantagesofthenewlydevelopedcarbonfreeworkingliningaremainlyasfollows:1)theinherentweaknessesofjointopening,verticalcrackingoflining,excessiveerosionofbrickedge,etc.aresurmountedsuccessfully,whichimprovestheoperationalsafetyofladles;2)theoutertemperatureoftheladleshelldecreasesby45-50℃comparedwiththatofthetraditionalcarboncontainingbricklining;3)theservicelifeofnew-typeworkingliningis150-170heats,nearlydoublingthatofthetraditionalcarboncontainingbricklining;thespecificconsumptionofrefractoriespertonsteeldecreasesbyabout20%;4)thecarbonpickupofmoltensteelisnotobviouswhichismerely5-10ppm,whichsatisfiesthedemandsoflow&ultralowcarbonsteelproduction.

简介：Siliconcarbide(SiC)-alumina(Al_2O_3)-mullite(Al_6Si_2O_(13))compositepowderwassuccessfullysynthesizedat1550℃for5hviacarbothermalreductionreaction,andtheeffectsofvariousmassratiosofactivecarbontoflyash(0.38,0.44and0.58)onthephasecompositionandmicrostructureofproductswereinvestigated,andtheformationprocessofthepowderwasalsoanalyzedindetail.Theproductsmainlyconsistofβ-SiC,α-Al_2O_3,Al_6Si_2O_(13)andFeSi.IncreasingcarboncontentfavorsthedecompositionofAl_6Si_2O_(13)andformationofSiC.Theaverageparticlesizeofβ-SiCandα-Al_2O_3isabout1μmandthatofAl_6Si_2O_(13)is5-10μm.TheformationprocessofSiC-Al_2O_3-Al_6Si_2O_(13)powderincludesthedecompositionofmulliteinflyashandformationofSiC.