简介：Sinteredmagnesiaclinker(alsocalledsinteredMgO)waspreparedwithMg(OH)2(preparedbylightcalcininghydrationofmagnesite)andmagnesiteasstartingmaterials,respectively,bythetechnicalprocess:lightcalcining(850℃1h)→grinding→molding→firing(1600℃3h).ThemorphologyandstructureoflightcalcinedMgOpowderspreparedwithmagnesiteorMg(OH)2wereanalyzedbyXRD,SEMandFT-IR.ThesinterabilityandmicrostructureofsinteredmagnesiapreparedwithmagnesiteorMg(OH)2wereresearched.Theresultsshowedthat:(1)lightcalcinedMgOpowderspreparedwithmagnesiteorMg(OH)2werebothface-centeredcubicstructure.ThelightcalcinedMgOpreparedwithmagnesitehadtheresidualoffunctionalgroupCO32-,andthatpreparedwithMg(OH)2didn'thaveCO32-,andwaseasytobreak,whichreducedthegrindingtime.(2)BecauseofthehighactivityofthelightcalcinedMgOpreparedwithMg(OH)2andthecatalysisofthewaterresidualinthedecomposingprocessofMg(OH)2,theapparentporosityofsinteredmagnesiadecreasedto0.6%from2.0%ofbeforehydration,closedporositydecreasedto2.8%from6.1%,andbulkdensityincreasedto3.46g·cm-3from3.29g·cm-3.

简介：ThehotloaddeformationtestsoffourkindsofinsulatingfireclaybrickswerecarriedoutusingahightemperaturecreepfurnacefromSinosteelLuoyangInstituteofRefractoriesResearchCo.,Ltd.Thetestingloadwasfixedat0.069MPaandthetotaltestingtimewaswithin6hincludingtheholdingtimeof1.5h.Thehotloaddeformationprocessofinsulatingfireclaybrickscanbedividedintothreesteps:(1)expansionstepfromroomtemperaturetoRULTmax;(2)quickshrinkagestepbetweenRULTmaxandTtest;3)relativelyslowshrinkagestepduringholdingprocess.Thedeformationrateatthebeginningofholdingprocess(D0h)shouldbecontrolledwithin±0.1%.ThehotloaddeformationtestingtemperatureofinsulatingfireclaybrickswasoptimizedasthevalueofRULTmaxplus220℃.

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