简介：Theeffectsofrefractoriesofquartz-corundunconsistingof45mass%quartzand55mass%corundum,fusedcorundumandfusedmagnesiaonthetotalaxygencontent(TOC)andthecompositionofinclusionsininterstitialfree(IF)steelwerestudied.3mass%microsilicawasaddedintothethreerefractoriesasbinder.Therefractorieswereshapedasliningofthegraphitecruciblebycastablemethod.IFsteelwasplacedinthecrucibles,thentheywereheatedat1600℃for90minand45minrespectively.Oxygencontentsofthesteelsampleswereobtainedbyaxygendeterminator.InclutsionswereanalyzedbySEMandEDS.TheresultsshowthattheTOCofsteelincreasedwithincreaseofIndexofOxygenPotential(IOP)oftherefractories.ThesteelsamplecopedwithMgOrefractorieshavingthelowestIOPhasthelowestTOC.

简介：Fivelightweightmullitecastableswerepreparedusingthelightweightmulliteaggregate(M45A)withnarrowparticlesizedistributionandsphericalshape,mullitepowder(M45P),kyanitepowder,microsilicaandSecar71cementasrawmaterials.Afterthespecimensfiredat1100℃,1200℃and1300℃for3h,respectively,theeffectsofkyanitecontents(8%,10%,12%,14%,16%bymass)onthephysicalproperties,phasecompositionandmicrostructureswereinvestigatedthroughanX-raydiffractometer(XRD),ascanningelectionmicroscopy(SEM)andamicroscopymeasurementmethod,etc.Theresultsshowthat,forthespecimensfiredat1300℃withthekyanitecontentfrom8%to16%,thebulkdensitiesandapparentporositieschangelittle,butthecoldmodulusofruptureandthecrushingstrengthsdecreasesignificantly,andthelinearchangeratesincreasefrom-0.87%to0.64%.Themostappositemodeisthespecimencontaining12%kyanitefiredat1300℃,whichhasahighcrushingstrengthof29.3MPa,alowlinearchangeof0.18%,anapparentporosityof36.8%andabulkdensityof1.73g/cm~3.

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