简介：Hexagonplate-likeAl8B4C7powdersweresuccessfullysynthesizedusingamixtureofdiborontrioxide,activatedcarbonandaluminumoraluminabyacarbothermalreductionprocess.TheeffectofAlsourceandstartingmaterialsadditionsonsynthesisofAl8B4C7wasinvestigated.ThephasecompositionandmicrostructureofAl8B4C7powderwerecharacterizedbymeansofXRD,SEMandEDS.ThemainphasecompositionsoftheproductssynthesizedfromAl,B2O3andactivatedcarbonareAl8B4C7andAl2OC.Al2O3canreplaceAltosynthesizeAl8B4C7.Al8B4C7grainssynthesizedfromAl2O3,B2O3andactivatedcarbonarehexagonplate-likeandhaveathicknessof10μmandasizeofabout100μm.

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-SiCcompositepowderswerepreparedinargonatmosphereusingcoalgangueandcarbonaceousmaterials2O3-SiCcompositepowderswereinvestigated.Theresultsindicatethat:temperature,soakingtimeandchlorideadditivehavesignificantinfluenceonthesynthesizedAl2O3-SiCcompositepowders.Basedontheresults,theoptimizedAl2O3-SiCcompositepowders（Al2O358mass%andSiC42mass%）withparticlesized50≤5μmwerepreparedusingcoalgangueandcarbonblackasstartingmaterialsafter3hfiringat1550℃.andproperadditiveadditioncouldreducethetemperatureby50℃.