简介：SinteredmulliteispreparedbykyanitepowderwithAl2O3contentof45%and50%(Yinshan,NanyangCity,China),andtheindustrialaluminaisaddedtocontrolthechemicalcomposition.ThedifferentseriesofsinteredmulliteaccordingtotheAl2O3content(45%-70%)aredesigned.Therawmaterialsaremixedandcompacted,andthensinteredatdifferenttemperatures.Physicalproperties,phasecomposition,microstructureandrefractorinessunderloadofthesynthesizedsamplesarecharacterizedbyphysicalpropertytest,XRD,SEMandRULtest,inordertoconfirmthequalityofsinteringandtherelationshipbetweentemperatureandmullitizationreaction.Theresultsshowthatthesinteredmullitefromlow-mediumgradekyanitehaswelldevelopedmullitecrystalsandacontinuousstaggerednetworkstructureisformed,whichhasasignificantcontributiontoincreasingthehightemperatureperformanceofmullite.

简介：Threekindsofhigh-aluminarepairingmixesformedium-frequencyinductionfurnacewerepreparedbyrammingmethodwithsodiumsilicate.phosphoricacidandaluminiumdihydrogenphosphateasbinder.respectively.Physicalpropertiesofthespecimensheattreatedatdifferenttemperaturesweretestedandcompared.Theresultsshowthatthespecimenbondedbysodiumsilicatebehavesmuchhigherstrengthafterfiredat1600℃comparedwiththespecimenbondedbyphosphoricacidoraluminiumdihydrogenphosphate.Duetomoreliquidphaseformation,thepropertiesofspecimenbondedbysodiumsilicatearepoorwithalowstrengthandalargevolumeshrinkageathightemperatures.Meanwhile,thespecimensbondedbyphosphoricacidandaluminiumdihydrogenphosphate,respectively.showrelativelyhighstrengthsandslightvolumeexpansionsathightemperaturesbecauseofin-situmulliteformation.