简介：ThemagnesiabasedcurablespecimenswithdifferentSi3N4contentswerecastedusingsinteredmagnesite(w(MgO)=95%)asstartingmaterial,SiO2micro-powderasbinder,0.3%,4%and5%β-Si3N4powderreplacingtheequaladditionofmagnesiapowderrespectively.Theslagresistancetestwascarriedoutat1550℃for3husingBaosteeltundishslagandstaticcruciblemethod.Theresultindicatesthat:introducingSi3N4couldobviouslyimprovetheslagresistanceofMgObasedcastable,whichincreasedwithincreasingSi3N4.DenseSiO2sinteredlayerformedonthesurfaceofmagnesiabasedcastablebecauseoftheoxidationofSi3N4addition,whichcanpreventthefurtherslagpenetration.Inthedeepinnerofcastable,thepartial-pressureofoxygenwasverylow,soSi3N4canexiststably.Meanwhileinreducingatmosphere,Si3N4washardtobesintered,whichresultedinthelooseinteriorstructureofMgObasedcastable.

简介：杭氧工程成套部在贯彻公司总部"历兵秣马,挺进市场,严格管理,减耗增效"的工作方针指导下,积极主动挺进市场。由销售处、技开处、工程成套公司组成的投标小组不辞辛劳,经多次到四川中国核工业建峰化工总厂,投标两套150m~3/h空分装置,最后以先进的技术、合理的价格和优良的技术服务,在众多的投标者中,一举中标。

简介：Si3N4powderandhot-pressedSi3N4ceramicsaddedwithAl2O3areusedforinvestigatetheiroxidationbehviorinairandnitrogenatmosphere(withoxygenpartialpressurePO2=1-10Pa),TheoxidationproductsofSi3N4areexaminedbychemicalanalysi,X-raydiffraction(XRD)andXPSmethod,Also,thermodynamiccalculationismadetoanalyzeoxidationbehaviorofSi3N4.TheresultsshowthatonlypassiveoxidationwilloccurwhenSi3N4isoxidizedinairathightemperature,whereasinN2athightemperature,theactiveoxidationisdominantinspiteoftheexistenceofalittlepassiveoxidation.

简介：ThemechanicalpropertiesofpressurelesssinteringFe-Si3N4bondedSiCandSi3N4bondedSiCwithsamemanufactureprocesshavebeencomparedinthispaper.TheoxidizingmechanismofFe-Si3N4bondedSiCceramicmatrixcompositehasbeeninvestigatedespeciallythroughTG-DSC(thermogravimetricanalysis-differentialscanningcalorimeter)experiment.DuringoxidationprocedurethemainreactionistheoxidationofSiCandSi3N4,SiO2whichformprotectingfilmtopreventfurtheroxidizing.AndresidualironinthesamplesbecomeFe2O3andFe3O4,theoxidationkineticsat1100～1300℃ofre-Si3N4bondedSiChasbeenstudiedespecially.Theweightgainperunitareaatinitialstagechangesaccordingtobeelinerule,inthemiddleaccordingtoconic,andinthelastoxidationperiodfollowsparabolarule.

简介：密歇根州经济开发公司（MEDC）宣布，金发科技（美国）公司计划投资6000万美元（4．125亿元人民币）并创造150个工作岗位，以扩建其位于密歇根州坎顿市的加工厂。

简介：DenseSi3N4BNcompositeceramicswerefabricatedbysparkplasmasinteringat1500,1600and1650℃under50MPafor5minusingSi3N4andBNpowdersasstartingmaterialsand2mass%Al2O3and6mass%Y2O3assinteringadditives.ThevolumefractionofBNinSi3N4BNcompositepowderswaschosenas10%,20%,and30%,respectively.TheresultsofXRDandSEMshowthatα-Si3N4completelyturnsintoβ-Si3N4whenthecompositeceramicsaresinteredat1650℃;theadditionofBNhindersthegrowthofSi3N4grains,refiningthestructure;VickershardnessandfracturetoughnessofthecompositeceramicsdecreasewiththeincreaseofBNcontent.

简介：Inthispaper,theinflucnceofchiefprocessparametersontheontinuousproductionofSi3N4powderbyrenitridationhasbeenstudied,Thesutiableprocessparametershavebeenfound,andhighqualitySi3N4powderhasbeendeveloped.

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简介：5月6日起，健康卫生产品领先品牌“威露士”联合麦当劳餐厅，免费派送150万支威露士热销产品免搓洗洗手液，提高人们卫生意识，帮助捍卫健康，对抗禽流感!记者从威露士了解到，本次大规模篼费派送活动将同时存北京上海、广州、深圳、江苏、浙江、天津、大连、武汉等省会城市展开，覆总计覆盖超过1100家麦当劳餐厅，150万支成露士免搓洗洗手液将悉数派出。

简介：Thespecimenswerepreparedbymoldingthemixtureofsilicafume(w(SiO2)=94.5%;averageparticlesize:0.08μm)andsiliconnitride(≤0.074mm)withamassratioof11,carbonembeddedfiringat1300℃,1450℃,1500℃,1550℃and1600℃for3hinair,andthenwater-cooling,respectively.Themicrostructureandphasecompositionofthespecimenswereanalyzed.Theresultsshowthat:(1)silicafumereactsobviouslywithSi3N4formingSi2N2Oabove1550℃.TheedgesandcornersofSi3N4grainsbecomesmoothandtheSi3N4grainsdistributeinthecontinuouscementationphaseofSi2N2OformingthedensestructureofSi2N2OpackedSi3N4;(2)below1500℃,theedgesandcornersofSi3N4grainsareclear,Si2N2Odoesn'tform,andonlySiO2crystallizesfromsilicafumewhichhappensobviouslyat1300℃.

简介：TheeffectoftheadmixturesofAlandSimetalsandB4CandMgAlONcompoundsontheoxidationofMgO/Si3N4compositerefractoryhasbeenstudied,whichisapromisingcarbonfreerefractoryforsteel-makingapplicatlon.Thefourkindsofadmixturescanbeusedasanti-oxidantsforSi3N4,butthemixtureofAlandSiachievedthebestresult.Themixturecannotonlyplaytheroleasantioxidant,butalsoassistthesinteringprocessandhelpformdensesinteringlayer,improvingthepropertyofthecomposite.

简介：据悉，河南融鑫化工股份有限公司近期在新乡市获嘉县建设年产150万t甲醇、48万t聚丙烯、副产33万t汽油的大型煤化工基地。项目总投资额规划为192亿元。预计3年后建成投产。

简介：介绍了一起150m~3/h空分设备分镏塔主冷发生的爆炸事故,原因是油脂带入塔内,液氧中可燃物质摩擦生成热或静电火花。并评述了防止措施。图1。

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简介：SiliconoxynitridewasaddedinshapedAl2O3-SiC-Crefractorymaterialtoimprovetheslagresistanceinthispaper.Optimumaddingquantityofsiliconoxynitridepowderwasalsostudied.TheresultsshowthattheslagresistanceofAl2O3-SiC-Cshapedrefractoryisimprovedwhen2%or3%Si2N2Oisadded.AreasonableamountofSi2N2OaddedintoAl2O3-SiC-Cshapedrefractorycanproducesiliconoxideintotheslag,whichcanimprovetheviscosityofslagandpreventtheslagerosionandpenetration.

简介：EffectsofAl—Siadditiononhotmodulusofrupture（HMOR）,thermalshockresistance

简介：云南150kt／a二甲醚项目1月6日在滇南工业重镇开远市成功投产。云南煤化工集团解化公司总经理朱庭琦表示，150kt／a二甲醚项目工程量大、工期短，关键技术熔渣气化炉是云南煤化工集团拥有自主知识产权的技术，也是全球首例在气化低热值褐煤上的运用。该项目的成功开发和应用，为洁净化利用云南省低热值褐煤乃至国际市场的煤炭资源，实现高效洁净气化提供了先进的技术支撑，探索山了一条投资经济、技术可行的技术路线，为国内外低热值煤的开发利用闯出了一条创新之路。

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