简介：Thepropertiesandlowandmediumtem-peraturebondingmechanismsofvariedtypesofSiO2ultrafinepowderusedinceramicandrefractoryandthetemperatureatwhichSiO2ultrafinepowderbegantoreactwithAl2O3werestudied,AndinitialresearchesoneffectsofultrafinepowdersofAl2O3,SiC,3Al2o3·2SiO2,MgO·Al2O3andZrSiO4onpromotingsinteringweremade.TheresultsindicatedthatamongvarioustypesofSiO2ultrafinepowder,non-crystalsil-icaultrafinepowderwacharacterizedbyitsstructureandproperties,Itcouldyieldconsid-erablesilicagelonitssurfaceatlowtempera-ture,whichthendehydratedandformedSi-O-Sibond,therebydevelopinganettystructurethatcausedhigherbondstrengthatlowandmediumtemperaturesincethenettystructurebasicallyremperaturesincethenettystructurebasicallyreainedastermperturerising.SiO2ultrafinepowderbegantoreactwithAl2O3at700℃,Allofothertypesofultrafinepowderhadeffectsonstimulatingsintering,buttheeffectsweresignificantonlywhentheparticlesizeofultrafinepowderwaslessthan5μm。

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简介：Thepaperdescribesthereactionbetweencar-bon-containingrefractories,magnesia-chromere-fractoriesandmatte,converterslag.Theresultsshowthatcarbon-containingrefractorieshavegoodresistancetomatteandconverterslaginnitrogenat-mosphere,Thepracticalresultsareunsuitableforconverter,highperformacemagnesiachromere-fractoriesarepromisingmaterials.Newlydevel-opedhighqualitydirectbondingmagnesiachrome,rebondedco-clinkermagnesiachrome,semi-rebondedmagnesiachrome,fusedcastmagnesiachromeusedinsmeltingfurancesareintroducedbriefly.

简介：Inthispaper,basedonthreedifferentkindsofceramicsidedamsforthinstripantinuouscasting,thefrictionandwearingpropertywerestudied.Theeffectsoffrictionpressure,temperatureandfrictiontimeonthefrictionandwearingpropertyoftheceramicsidedamwereresearched.What’smore,thefrictionmechanismandwearingmechanismoftheceramicsidedamwereresearchedaswell.ResultsshowthattheceramicsidedamofBN-SiAlONhasthebestwearingresistanceproperty.whileatroomtemperature,16minoffrictiontimeand0.35MPaoffrictionpressure,thetestfrictioncoefficientis0.60andwearingcapacityis272.358mm~3.Inaddition,whenat400℃,16minoffrictiontimeand0.18MPaoffrictionpressure,thetestfrictioncoefficientis0.70.Thefrictionmechanismofceramicsidedamwiththeoppositewearingmaterialismainlythecompositewearofadhesion,abrasiveandfatigue.

简介：Thenon-burnedcorundumspineluppernozzle,maldeofelectro-fusedcorunndumpowder,highpureelectro-fusedspinelwiththermosettingresinasbinder,addedwithcompoundant-oxdationadditives,hassuperiorHMOR,excellentcorrosionresistanceandsimpleproductionprocess,Theuppernozzlewasusedin90MTladleandtheservicelifewasimprovedby50%to60%