简介:ThetendsofrefractoriesdevelopmentinChinainthenewcenturyhavebeendiscussed,ThemainR&Dthemesforthefirstdecadearesuggestedtobasfollow:(1)Highqualitysyntheticrwamaterialsbasedonourrichresourcesofbauxiteandmagnesite;(2)Highperformancefunctionalrefractoriesbasedonsyntheticrawmaterials;(3)Oxideandnonoxidecompsitematerialsprinci-pallyforapplicationsatcriticalareasofhightemperaturenewtechnologies.
简介:Thepotentialapplicationsofsomehightenologiesinrefractories,suchas,nanotechnology,in-situsynthesis,self-propagatinghigh-temperaturesynthesis,functionalgradientmaterials,computerassisteddesignandsomenewadvancedrefactoriesinSi-Al-O-Nsystemarebrieflydescribed.Thecharacteristicsandpreparationprocessesofthesenewrefractoriesareintroduced,andtheremainingproblemsawaitingeffectivesolutionsarepointedout.Somesuggesionsonfuturediectionofresearchanddevelopmentarefitlymade.
简介:IntheprocessofVHD,argonisblownintothemoltensteelthrouhttheporousplugswhicharemountedintheladlebottom.AnewtypeofporouscorundumplughasbeendevelopedfortheVHDsecondaryrefiningladlefurnaceinFushunSteelWorks,Itisfoundthatwhenthemeangrainsizeofcorundumarticlesdecreasesfrom760μmtp650μm,thephysicalpropertiesandservicelifeoftheplugarethesameasthatofimportedone,andcanbenormallyusedintheVHDprocess.
简介:CurrentlytheservicelifeofCDQshaftsinChinaismainlyrestrictedbythepropertiesoftheinclinedfluebricks.Inthiswork,basedonthesystematicanalysisofthedamagemechanismofinclinedfluerefractories,highperformancemullite-SiCbricksweredeveloped.Thebrickswereproducedbycorundum,andalusite,SiCandotherhighpurityrawmaterials.Metalsiliconandaluminaultramicropowderwereaddedtoformdispersionmulti-phasestructure,fortifyingthematrixandimprovingthemicrostructure.Theproductshaveexcellentpropertiessuchaslowporosity,highdensity,goodwearresistance,highrefractorinessunderload,andgoodthermalshockresistance.Theproductscanreplacetheordinarymullite-SiCbricksandobtainagoodservicelife.
简介:Itisexpectedthatinthenewcentury,tocopewithdevelopmentsofnewhightemperaturetechnologies,anewgenerationofhighperformancerefractoryceramicswillemergeandflourishwhichshouldincludethefollowing(1)oxideandnonoxidecompositescharacterizedbyauniquecombinationofhighhotstrength,highthermalshockresistanceandhighcorrosionresistance;(2)freeCaObearingbasicrefractoriescapableofpurifyingmoltenmetalforimprovingcleanlinessandofabsorbingcontaminantsfromwastegasesforreducingenvironmentalpollution;(3)freeflowingzerocementcastableswithimprovedthermomechanicalproperties,thermalshockresistanceandcorrosionresistanceandgradientcastableswithvaryingmatrixcompositionandvaryingtexture.
简介:Althoughhigh-performancebasicrefractorymaterialsplayanessentialroleinstate-of-the-artsteel-making,magnesiacastableshavenotbeenwidelyuseduntilnow.Amajorchallengeisthatbruciteformation(Mg(OH)2)duringMgOhydrationcausesvolumeexpansionandsubsequentcracking—aphenomenoncommonlycalled"slaking".Toovercomeproblemsrelatedtoslaking,anewspecialtyproduct,SioxX-Mag,hasrecentlybeendevelopedforcement-freeMgOcastablesbasedonMgO-SiO2-H2Obond.Specimensfromindustrial-scale-sizedblocksafterdry-outwerecharacterisedbySEMandXRDtechniques.UsingSioxX-Magincombinationwithmicrosilica,crackingcausedbybruciteformationissuppressed.Theresultsdemonstratethatthedosageofmicrosilicaplaysessentialrolesinthecrackformationinlargesamples.Furthermore,thecompatibilityofSioxX-Magwithdifferenttypesofbasicaggregates,mediumtohigh-gradedead-burnedmagnesiaandolivine,hasalsobeenevaluated.High-performance,self-flowingcement-freeMgOcastableshavebeendeveloped.