简介:Inordertoimprovetheservicelifeofcorundumliningforinductionfurnace,corundumdryrammingmixwaspreparedusingbrowncorundum,fusedmagnesia,andα-Al2O3micropowderasmainstartingmaterials,andtheinfluenceofα-Al2O3micropowderadditions(0,1%,2%,and3%,inmass)onpropertiesofcorundumdryrammingmixwasinvestigated.Theresultsshowthatafterheattreatingat1600℃,withtheincreaseofα-Al2O3addition,thepermanentchangeindimensionsonheatingofthespecimensdecreasesfirstlyandthenincreases,bulkdensityincreases,apparentporositydecreases,andthecrushingstrengthdeclinesfirstlyandthenenhances;whentheadditionofα-Al2O3is2mass%,thepermanentchangeindimensionsonheatingofthespecimensisrelativelysmallandthecrushingstrengthdecreasesto22.8MPa.TheXRDandSEMresultsshowthatafterfiringat1600℃for3hsmallgranularmagnesiumaluminatespinelformsandiswelldistributed,whichenhancesthedensity.
简介:TheAl2O3-SiCcompositepowderswerepreparedinargonatmosphereusingcoalgangueandcarbonaceousmaterials
简介:Simplethree-pointbendingtestatambienttemperaturecharacterizedthemechanicalbehaviorofburnedAl2O3-Crefractoriesbeforeandafterthermalshockinassociationwiththeprocessingparameters(graphitecontentandcokingtemperature,etc.).Theresultsshowedthatnon-linearplastic-elasticbehaviorunderloadlowerthancoldmodulusofrupture(CMOR)wasregisteredinallspecimensandreallinearelasticbehaviorcouldbeidentifiedafterthefirstload.Thetotaldeformationcouldbedividedintotwoparts,plasticandelasticareas.ThegraphitecontentandjointbondingsystemofcarbonandceramicphaseswereresponsibleformechanicalbehaviorofAl2O3-Crefractories.