简介：Ananalysisofthepresentandofthefutureoftherefractoriesindustryisbeingpresented,consideringsomeimportanttechnical,economical,humaandenvironmentalissues,onaworldwidebasis.Refractoriesarestillneededasconfinementmaterialstopreventheatandmasstransferlossesinmanydiversemanufacturingindustries,andwillremainso,butthemainchallenges,thisindustrydoneedtomeet,aretoadjusttoanovercapacityproduction,tocopewithnewneedsofthecustomers,inparticularthe"outsourcing",whichisanewcustomer/supplierrelationshipbeingadoptedbymanyofthem,andtokeeptheresearchanddevelopmentaliveinamoreandmorecompetitivearena.Amongthedirectconsequences,aretheneedtokeeptheeducationworldinrefractoryengineeringtrainingaliveandtocopewithmacroandmicroprojectstochangetheimageoftheRefractories,fromacommoditymaterialtoasophisticated"high-tech"compositematenal.Somesuggestionsareprovidedinthetext.

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简介：Siliconcarbide(SiC)-alumina(Al_2O_3)-mullite(Al_6Si_2O_(13))compositepowderwassuccessfullysynthesizedat1550℃for5hviacarbothermalreductionreaction,andtheeffectsofvariousmassratiosofactivecarbontoflyash(0.38,0.44and0.58)onthephasecompositionandmicrostructureofproductswereinvestigated,andtheformationprocessofthepowderwasalsoanalyzedindetail.Theproductsmainlyconsistofβ-SiC,α-Al_2O_3,Al_6Si_2O_(13)andFeSi.IncreasingcarboncontentfavorsthedecompositionofAl_6Si_2O_(13)andformationofSiC.Theaverageparticlesizeofβ-SiCandα-Al_2O_3isabout1μmandthatofAl_6Si_2O_(13)is5-10μm.TheformationprocessofSiC-Al_2O_3-Al_6Si_2O_(13)powderincludesthedecompositionofmulliteinflyashandformationofSiC.