外文翻译(中英文)制备及鼓风炉产生的玻璃陶瓷渣性能烧结过程.doc
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外文翻译(中英文)制备及鼓风炉产生的玻璃陶瓷渣性能烧结过程.doc
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Preparationandpropertiesofglass–ceramicsderivedfromblast-furnace
slagbyaceramic-sinteringprocess
Abstract
Glass–ceramicsweresynthesizedusinggroundblast-furnaceslagandpotashfeldsparadditivesbyaconventionalceramic-sinteringroute.Theresultsshow5wt%potashfeldsparcanenhancethesinteringpropertiesofblast-furnaceslagglassandtheresultsglass–ceramicshavedesirablemechanicalproperties.Themaincrystallinephaseoftheobtainedglass–ceramicisgehlenite(2CaO_Al2O3_SiO2).Ahighmicrohardnessof5.2GPaandabendingstrengthhigherthan85MPaaswellasawaterabsorptionlowerthan0.14%wereobtained.2009ElsevierLtdandTechnaGroupS.r.l.Allrightsreserved.
1.Introduction
Glass–ceramicsarefine-grainedpolycrystallinematerialsformedwhenglassesofsuitablecompositionsareheat-treatedandthusundergocontrolledcrystallizationtoreachalowerenergycrystallinestate[1].Sincetheearly1960s,usingwastetoprepareglass–ceramicshasbeendevelopedinRussia,byemployingslagofferrousandnon-ferrousmetallurgy,ashesandwastesfromminingandchemicalindustries[2].Lately,thewasteofcoalcombustionash,flyashandfilterdustsfromwasteincinerators,mudfrommetalhydrometallurgy,passcementdust,differenttypesofsludgeandglassculletormixturesofthemhavebeenconsideredfortheproductionofglass–ceramics[3–7].Usingwastetoprepareglass–ceramicsissignificantforindustrialapplicationsaswellasforenvironmentprotection[8]
Theconventionalapproachestosinterglass–ceramicsusuallyincludetwosteps:
firstvitrifyingrawmaterialsatahightemperature(1300–15008C)andthenfollowinganucleationandcrystalgrowthstep.Thedisadvantageoftheconventionalrouteisthatitisdifficulttovitrifytherawmaterialsandthehighenergyconsumptioninthisstep.Analternativemanufacturingmethodtoproducesinteredglass–.ceramics,inwhichsinteringandcrystallizationoffineglasspowderstakeplacesimultaneously,hasrecentlybeenreported[9].Insuchroutefineglasspowdersarepressedandsintered,andthecrystallizationoccurswithdensification.However,thisroutealsoneedsashorttimetovitrifyrawmaterialsathightemperatureforpreliminaryglass-making.
Theblast-furnaceslagisformedintheprocessesofpigironmanufacturefromironore,containscombustionresidueofcoke,fluxesoflimestoneorserpentine,andothermaterials.Ifthemoltenslagwascooledquicklybyhigh-pressurewater,finegrainglassofvitreousCa–Al–Mgsilicatecanbeformed[10].Thissuggeststheblast-furnaceslagcanbeusedasaglasssourcetomakesinteredglass–ceramicsandvitrifyingrawmaterialsathigh-temperaturestepcanbeomitted.Thefreeglasssurfacesarepreferablesitesfordevitrificationandthuscrystallizationmayoccurwithoutanynucleatingagent.Therefore,thefinelygroundslagpowdercanusedasthemaincomponentofparentglass.Comparingwiththetwosinteredmethodsmentionedabove,aremarkableadvantageofthepresentstudyisabsentofvitrificationstepbecauseoftheusingofblast-furnaceslag.Thusalowenergycostandmanufacturesimplicitycanbeexpected.However,inourpreviousstudiesglass–ceramicspreparedwithpureblastfurnaceslagshowpoorproperties[11].Therefore,somesinteringadditivesareneeded.Inthisstudy,weshowwhenusingblast-furnaceslagtoprepareglass–ceramicsbyaconventionalceramicsroute,ifsuitableamountofpotashfeldsparisadded.Glass–ceramicswithhighmicrohardnessandbendingstrengthaswellaslowerwaterabsorptioncanbeobtained.
2.Experimentalprocedure
Theslag(providedbyAnyangironCorporationofChina)waspulverizedbyballmillingforabout24h(sizeintherangeof10–20mm),andthenblendedwith5–10wt%potashfeldsparpowder.Themixtureswereballmillingfor2h.WeuseK5,K8andK10todenotetheweightpercentofpotashfeldsparinthesamples.
TheprocessusedinourstudyisillustratedinFig.1.Theblendedpowderswereuniaxiallypressedinasteeldieatroomtemperature,usingahydraulicpressureof40–60MPawithoutanybinder.Theobtainedgreenbodiesweresinteredinairatnucleationtemperatureof720–760℃andcrystallizationtemperatureof800–900℃fordifferenttimes(from20to60min),withheatingratesof2–5℃/min,followedbyahightemperaturetreatmentat1200℃
Theblendedpowderswereexaminedbydifferentialscanningcalorimetry(DSC)(Labsys,Setaram,France)inairwithaheatingrateof10℃/minfromroomtemperatureto1100℃.Thephaseoftheblast-furnaceslagandobtainedglass–ceramicswereexaminedbyX-raydiffraction(XRD)(ModelD/MAX-3B,RIGAKU,Japan).ThesamplessurfaceswerepolishedandcorrodedinHF(5vol%)for20sandthenobservedbyscanningelectronmicroscopy(SEM)(ModelJSM-5610LV,JEOL,Japan).Thedensityofthesampleswasmeasured
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- 外文 翻译 中英文 制备 鼓风炉 产生 玻璃 陶瓷 性能 烧结 过程