简介：InfluenceofadditivesandcompositionofthematrixonmecharicalpropertiesofSialonbondedcorundumbrickwithappropriatenitridationsinteringcurvewasinvestigatedinpresentpaper.ThephasecompositionandmicrostructureofthesinteredspecimenwereanalyzedbymeansofSEMandXRD.Theresultsindicatethatwithappropriatecontentofultra-finealuminapowderandaditiveA,bothcoldandhotmechanicalpropertiesofspeimensarenotablyenhanced.Themicrostructureofspecimenisdenseandwithlessporosity,Mainphaseofthespecimeniscorundum,β－sialonisalsoobservedasthebondingphase,littleimpurityisobserved.

简介：Thesynthesisofβ'-sialonpowderbycarbothermicreductionofclayfollowedbynitridationhasbeencarriedout.Theeffectofchargemixture,temperature,holdingtimeandnitrogenflowrateonsynthesiswasexamined.ThefiredsamplewasidentifiedbyXRDandthenitrogencontentoffiredsamplewasmeasured.Thesynthesisprocessofsialonpowderwasdescribed.

简介：二十世纪七十年代初期，日本和英国的研究者们在研究选用Al2O3作为Si3N4的烧结添加物时发现，当添加过量的Al2O3时便形成Si-Al-O-N系统，它是由于Al2O3中的Al、O原子部分替代了Si3N4中的Si、N原子而有效地促进了Si3N4的烧结，并形成了β-Si，N。的固溶体。该固溶体的英文简写名称为Sialon，“赛隆”为中文译名。随后，人们开始对其晶体结构、相组成、

简介：１ＱｕａｓｉｐａｒａｂｏｌｏｉｄＲｕｌｅＢａｓｅｄｏｎｔｈｅｐｒｉｎｃｉｐｌｅｔｈａｔｔｈｅｍｏｌａｒＧｉｂｂｓｆｒｅｅｅｎｅｒｇｙｆｕｎｃｔｉｏｎｉｓｔｏｗａｒｄｓａｍｉｎｉｍｕｍｗｈｅｎａｐｈａｓｅｉｓｓｔａｂｌｅ，ａｇｅｎｅｒａｌｒｅｌａ...

简介：X-rayfluorescencespectrometry(XRF),X-raypowderdiffractometry(XRD)andscanningelectronmicroscopy(SEM)wereusedtocharacterizethechemicalcomposition,phaseconstituentandmicrostructureofthecoalgasificationslag.Sialonpowdersweresynthesizedbycarbothermalreductionandnitridationusingthecoalgasificationslagasrawmaterials.Theexperimentalresultsshowedthatglassandamorphouscarbonwerethemainphases,quartzandcalciteasminorcrystallinephaseswerealsopresentedinporouscoalgasificationslag.MainconstituentsofcoalgasificationslagwereSiO2,Al2O3,CaOandresidualcarbon.SialonpowderwithCa-α-Sialonasmaincrystallinephasecanbesynthesizedwhencoalgasificationslagpowderswerereducedandnitridedat1500℃for9husingnitrogenflowof500ml/min.ThecoalgasificationslagisavaluableandeconomicstartingmaterialforpreparingSialonpowders.

简介：Basedonitsthermodynamicanalysis,β-Sialon-Alonmetastablecompositeceramichasbeenpreparedbyhotpressingsintering,XRDresultsindicatethattheproductofhotpressingsingeringisindeedSialon-Alonmetastableompositeceramic,whichisinaccordancewiththermodynamicanalysis

简介：ThephasecompostitionandmicrostructureofSialonpreparedfromChinesebauxitehavebeenstudied.TheuseofSipowderismoreeffectivethanthatofactivatedcarbonforreduction-nitridation.Forbauxitespecimenswith40～50%Siaddition,morethan90%ofSialonmaybeobtainedwhennitridedat1450～1500℃;themaincrystallinephaseisO'-Sialon(Z=0.2).

简介：SinteringadditivestogelcastingSialon-SiCweredecidedbytheoptimizingexperiments.TheresultsshowthatSoalon-SiCcanbesinteredunder1450℃andsinteringtemperaturedecreasesby100℃,when2%～3%TiO2orGuangxiclayisusedassinteringadditive.

简介：Thermalshockresistantpropertiesofreactionsinteredbauxite-basedβ-Sialonbondedcorundumhavebeeninvestigated,andtheresultsarecomparedwiththoseofAl2O3basedcounterpart.Itisfoundtheyallhaveverygoodthermalshockresistance.Theirresidualstrengthratiosafteronethermalshockcycleat△T=1200℃and△T=1350℃are61%～73%and53%～65%respectively.Theircriticaltemperaturedifference(TSR)is600℃～800℃.TSRparametersarecalculatedbasedonthermalexpansion,modulusofelasticity,andfracturetoughnessdetermined.ThereasonsforimprovingTSRofthesecompositematerialsarediscussed.

简介：Themicrostructureandslagerosionfractaldimensionofreactioninterfaceofβ-Sialon-Al2O3brickusedin300MtironladleofBaosteelhavebeenstudiedbySEMandXRD.Theresultsindicatedthatβ-Sialon-Al2O3brickexhibitedexcellentslagresistance.Themainwearmechanismofβ-Sialon-Al2O3brickismainlyfromthespallingcausedbythermalmechanicalstressandattackedbyslagsecondly.

简介：随着世界各国钢铁工业的技术进步，高炉朝着大型、高效和长寿化发展，并逐步采用富氧喷煤、高风温操作、高压炉顶等新的炼铁技术。武钢、邯钢为适应这些技术的发展，对1800m^3高炉进行扩容(2200m^3)性大修，选用β’—赛隆结合刚玉砖为高炉炉缸、炉腹“陶瓷杯”炉衬材料，以实现减少炉底、炉缸的热损失，提高铁水温度，使等温线向炉内方向移动；

简介：O'-sialon-ZrO2compositebasedonthecheapcommercialavailablezirconandsiliconasrawmaterialscanbeachievedbyusingreac-tionnitridationmethod,Moreattentionwasgiventothenitridingprocessandtheeffectofadditivesonit.Theexperimentalresultsshowthattherearetwonitridationpaths:oneisthedirectnitridationofsiliconpowderandtheotheristhroughthereactionbetweenthemedi-umcompoundZrSi2andthenitrogen.Theeffectsofadditionofcalciaandtheincorpora-tionofBNonthenitridingreactionwerealsoinvestigated,theprimitiveexperimentalresultsdemonstratedthatbothofcalciaandBNcoulddeterioratethenitridingdegree.

简介：Thekineticprocessofslagcorrosionforβ－Sialonandβ-Sialon-Al2O3compositeshasbeenstudiedbymeansofdipmethod(staticandself-rotating),Thecorrosionmodelisbuitlandtheformulaofcorrosionrateisdeduced,whichareinaccordancewithexperimentalresults.

简介：β-sialon/alumina/silicamixturesweresinteredinflowingnitrogenat1500℃and1600℃respectively.ThesinteringpropertiesandmorphologyofsampleswereinvestigatedbySEM,EDSandXRD.Resultsshowthatsinteredpropertiesofthesamplesareinfluencedbysoakingtemperaturesandcompositions.Bulkdensitiesofsamplesareincreasedwiththeincreaseofthesoakingtemperature,whereastheapparentporositiesaredecreased.Masslossofthesinteredsamplesat1500℃islowerthanthatat1600℃,butallthemasslossremainsapproximatelyconstantwiththeincreaseofsialoncontent.Fromthepointofthermodynamicanalysis,ComplexchemicalreactionstakeplaceinsamplesduringsinteringprocessandthevolatileofSiO(g)isresponsibleforthemasslossofsamples.Comparedtocrosssectionmicrostructureofβ-sialon/Al2O3/SiO2mixturessinteredincokepowderbedconsistingofthedensecenterwithwell-developedcolumnofsialonphase,thetransitionalpartwithneedlelikegrainnitrogen-containingphaseandtheloosepartwithshortgranularAl2O3phase,thoseofmixturessinteredinflowingnitrogenisofwell-developedsialonindensecenterandslightlyloosepartwithsialondebris.

简介：

简介：以川西微晶白云母为主要原料，铝粉为还原剂，采用铝热还原氮化法合成了α-Al2O3／β-SiAlON材料，并利用X射线衍射仪（XRD）研究了不同温度下的物相变化及配铝量对反应产物的影响。结果表明：在1350℃和1450℃,所有样品的主要产物均为α-Al2O3和β-SiAlON相，但铝粉用量为35％（质量分数，下同）的样品经1350℃铝热还原氮化后的产物中含β-SiAlON相较多；当铝粉用量和加热温度分别为45％和1550℃时，反应产物中不含α-Al2O3和β-SiAlON相，却出现了AlON、AlON和Si3Al7O3N9相。

简介：AnO'-Sialon-Al2O3compositerefractorywaspreparedbyinsitureactionofSi3N4-ZrSiO4-Al2O3mixturewithfusedaluminaaggregates.Densification,insitureactionprocedureandmicrostructureofthematerialwereinvestigatedbymeansofX-raydiffraction,opticalandscanningelectronicmicroscopesandEDAX.