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简介：Whenliquidsteelslagproducedfromsteelmakingprocesswastreatedintothepost-coldslagbyconventionalmethods,thegreatdealofslagheatwasdissipatedintotheenvironment,causingalotofenergywasteandenvironmentalpollution.Inthisstudy,anovelapproachofdirectutilizationofhotsteelslagasarawmaterialandslagheatfortheproductionofglass-ceramicswasproposedandexperimentallytested.Inordertosimulateliquidslagfromsteelmakingelectricfurnace,40%water-quenchedslagwasremeltedat1450℃andthenmixedwith60%meltingadditives（silicapowder,aluminapowderandsodiumoxide,etc.）andsubsequentlymeltedtogetherat1500℃for1hintomodifiedliquidslagwhichwascast,heat-treated,annealedandtransformedintoglass-ceramics.Theheat-treatedglasssampleswereinvestigatedusingdifferentialthermalanalysis（DTA）,X-raydiffraction（XRD）,andscanningelectronmicroscopy（SEM）.Theresultsshowthatdominantcrystallinephaseisdiopside[CaFe（SiO3）2]andtheshapeofthecrystalislikethegranule,diameterisabout0.2-0.6μm.Aglass-ceramicwithnucleationtemperatureof695℃fortwohoursandcrystallizationtemperatureof893℃foronehourand1163℃forhalf-hourexhibitedthebestcombinationofproperties.Thismethodofslagmixedwithmeltingadditivestoadjustthecompositionoftheparentglassisimportantfortheindustrialproductionofglass-ceramicsbydirectutilizationofhotsteelslag.

简介：Viscosityofsoda-lime-silicateglassdopedwithrareearthoxides(Pr6O11,Eu2O3,Yb2O3)wasinvestigatedbytherotatingcrucibleviscometer,themeltingtemperatureandactivationenergyforviscousflowofthestudiedmeltwerederivedonthebasisoftheArrheniusEquation,thecoefficientofthermalexpansion,glasstransitiontemperatureanddilatometricsofteningtemperaturewerealsodeterminedwithdilatometry,inordertorevealtheeffectsofrareearthelementsonthebehaviorofsoda-lime-silicateglass.Theresultsshowedthatintroductionofrareearthoxidesdecreasedtheviscosityofsoda-lime-silicateglassandmeltingtemperatureofcorrespondingmelt,increasedcoefficientofthermalexpansionofsoda-lime-silicateglass.Theglasstransitiontemperature,dilatometricsofteningtemperature,andmeltingtemperatureofsoda-lime-silicateglassdopedwithrareearthoxidesincreasedwithincreasingcationicfieldstrengthofcorrespondingrareearthions.

简介：Anovelprocesstechnologytoprepareglass-ceramicsdirectlyfrommoltensteelslag(MSS)isproposedinthestudy.Theliquid-solidmixingmethodwasusedtoadjustthecomponentsoftheMSSandglass-ceramicswasobtained.Theeffectsofheat-treatmentconditionsonthemicrostructure,physicalandmechanicalpropertiesofsampleswerestudied.Economicalbenefitsofthenovelprocesswereanalyzed.Theresultsshowthatheat-treatmentisaveryeffectiveapproachtoachievingcrystallization.Thedominantcrystalphaseinproductsisdiopside[(Mg6Al2Fe2)Ca(Si1.5Al5)O2].Theshapeofthecrystallizationislikeagranule.Theglass-ceramicsamplesexhibitedgoodmechanicalpropertiesandpresentedchemicalstability.Theeconomicbenefitsoftheprocessareremarkableduetolessenergyconsumptioncomparedwithconventionalglass-ceramicsproductionmethods.

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简介：InordertosensitizetheluminescenceofEu3+ionsinheavymetalglass,zincleadborateglasssamplescontainingvariousconcentrationsofEu3+andTb3+ionswerepreparedtostudytheTb3+toEu3+non-radiativeenergytransferphenomena.EnergylevelstructuresofTb3+andEu3+ionswereplottedtoshowtheexcitationandenergytransferroutes.EfficientenergytransferfromTb3+toEu3+wasobservedandstudiedqualitativelyintermsofdopingconcentrations.Thesensitizationturnedouttobelesseffectivethanexpected.FurtherstudiestocharacterizetheoxidationofTb3+intotetravalentstateandtoexaminethemechanismofenergytransferareproposed.

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简介：Er/Ybco-dopedborate-silicateglasseswithvariousYbconcentrationswerefabricatedbyhigh-temperaturesolid-reactionmethod.Thephotoluminescencespectraaround1.55μmandthevisibleupconversionspectraweremeasured.TheradiativelifetimeofEr-4I13/2,com-paredwiththemeasuredone,wasobtainedbyJudd-Ofelttheorybasedontheabsorptionspectra.ArateequationmodelforEr/Ybco-dopedsystemhasbeenestablishedbasedonthedataobtainedfromthemeasurements,includingtheabsorptionandemissio...

简介：(Cu60Zr30Ti10)98Y2bulkmetallicglass(Φ4mm×70mm)wasobtainedsuccessfullybycoppermouldcoolingandspraying-casting,andsomesampleswereisothermallyannealedattemperaturesof473and623K,whichwaslowerthantheglasstransitiontemperature(Tg)for1h.Microstructureandpropertiesofas-castandannealedsampleswerestudied.Crystallizationphases(Cu10Zr7andCuZr)wereobservedinannealedsamples,andthespeciesandfractionofthesephasesincreasedwithincreasingannealingtemperature.Mic...