简介：利用化学多元醇法合成Gd2O3：Tb^3＋纳米粒子，通过对NaOH的加入速率的控制，能将纳米粒子的直径从1-2nm能增大到4nm。利用透射电子显微镜，紫外分光光度计对Gd2O3：Tb^3＋纳米粒子的形貌和尺寸、发光进行表征分析。结果表明：分多次加入NaOH比一次性加入NaOH能获得更大尺寸的Gd2O3：Tb^3＋纳米粒子。

简介：Synthesisofinorganicnanostructureswithspecificsizeandwelldefinedmorphologieshasattractedconsiderableattentionduetotheirsuperiorelectrical,optical,magnetic,andchemical

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简介：通过测试和分析此较SiO2·Al2O3·CaO·CaF2·P系统玻璃及其经酸处理前后的FTIR光谱,研究经酸处理前后玻璃结构变化.当玻璃组成中不含氟时,酸洗前后,其红外光谱形态几乎无变化,而当其组成中含氟时,最强谱带出现明显的分裂,且相对强度发生明显的改变,在～1086cm-1和～1024cm-1或～996cm-1处谱带的出现和相对强度的改变,表明在玻璃粉表面存在两相,即纯硅酸盐相和铝硅酸盐相,酸洗使玻璃颗粒表面形成不完全的硅凝胶包裹层,表明玻璃组成中含氟时,玻璃结构分相形成易于酸析相和不易酸析相.

简介：TiB2ceramicspowderwassynthesizedfromB2O3-TiO2-Mgsystem.TheeffectsofTiB2additionasdiluentonthecombustionsynthesisprocesswereinvestigated.TheresultsofthermodynamiccalculationandexperimentsshowthattheincreaseofTiB2contentrangingfrom0to20wt%canreducetheadiabatictemperatureTadfrom3100Kto2896KandcombustiontemperatureTcfrom2139Kto1621Krespectively.TheparticlesizeandhalfwidthoftheparticledistributionarealsoincreasedwiththeadditionofTiB2increasingfrom0to20wt%.ThecombustionproductisamixtureofTiB2,MgO,andotherintermediatephases.TheleachedproductcontainsmainlyTiB2,TiO2andTiN,anditsoxygencontentis7.77wt%.

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简介：α-Fe^2O^3材料在陶瓷、催化剂、颜料、防腐、感光材料和磁性材料等方面都有着重要的应用，而且因其原料来源丰富、用途极广，因而受到格外关注。所以，均分散α-Fe^2O^3胶体粒子的制备，不仅在理论研究具有较高价值，而且在实际应用上也有重要意义。

简介：一、前言复合材料研究是当代材料科学的最新分支。复合材料有单一材料无法相比的特性与优点:例如高硬度与耐磨性,良好的抗蚀性和特异的装璜效果。国外复合材料工艺已广泛地用于宇航,汽车及其他工业。复合电镀制金属基复合材料始于60年代,其作为表面处理技术它工艺简便,经济,无热处理过程因而不影响工件形状结构,镀层性能优良。例如由复合镀层Ni—Al2O3代镀硬Cr,不仅成本低性能优良,而且可免除Cr对环境的污染。因此近年来我国

简介：以浸渍法制备的10%V／Al2O3为催化剂，研究对GB染毒空气的脱除效果，考察接触时间、温度、温度和浓度等因素对GB染毒空气脱除效果的影响，用GC-MS和LC-MS对尾气组分进行了检测分析．

简介：CuO/γ-Al2O3catalystswerepreparedbyplasmatreatmentandconventionalimpregnationmethods.Thecatalyticcombustionoftwokindsofvolatileorganiccompounds(VOCs),tolueneandbenzene,werecarriedoutovertheseCuO/γ-Al2O3catalysts.ThesurfacepropertiesofthesecatalystswerecharacterizedbyX-rayDiffraction(XRD)andScanningElectronMicroscopy(SEM).TheexperimentalresultsshowedthatincatalyticcombustiontheactivityoftheCuO/γ-Al2O3catalystpreparedviaplasmawasmuchhigherthanthatoftheCuO/γ-Al2O3catalystpreparedbyconventionalimpregnationmethod.XRDresultsshowedthatanenhanceddispersionhadbeenachievedwiththeplasmatreatment.SEMresultsindicatedthatthesizebecamemuchsmallerandthesurfacebecamemoreuniformwiththeplasmatreatment.

简介：沪教版第五章中关于生铁的冶炼部分，有CO还有Fe2O3的实验，实验装置如图1所示。

简介：Al2O3/Al的三个系列把陶器的矩阵composites，命名矿泉，SPV和HP压成薄片，被不同方法制作。矿泉和SPV经由屏幕在空或真空中打印和随后的热处理用Al2O3片和艾尔泥浆被准备。HP样品被热压成为艾尔陪衬和Al2O3片的分层的栈。SEM和XRD被使用分析微观结构和夹层水晶阶段。弯曲力量，破裂坚韧和三个方法做的样品的破裂工作被测量并且比较。结果证明composites比Al2O3片有好一些的坚韧和更高的破裂工作。在三个方法做的样品之中，热压做的样品有最佳机械性能。排水量负担曲线和骨折机制被分析。

简介：Inordertoimprovetheservicelifeofcorundumliningforinductionfurnace,corundumdryrammingmixwaspreparedusingbrowncorundum,fusedmagnesia,andα-Al2O3micropowderasmainstartingmaterials,andtheinfluenceofα-Al2O3micropowderadditions(0,1%,2%,and3%,inmass)onpropertiesofcorundumdryrammingmixwasinvestigated.Theresultsshowthatafterheattreatingat1600℃,withtheincreaseofα-Al2O3addition,thepermanentchangeindimensionsonheatingofthespecimensdecreasesfirstlyandthenincreases,bulkdensityincreases,apparentporositydecreases,andthecrushingstrengthdeclinesfirstlyandthenenhances;whentheadditionofα-Al2O3is2mass%,thepermanentchangeindimensionsonheatingofthespecimensisrelativelysmallandthecrushingstrengthdecreasesto22.8MPa.TheXRDandSEMresultsshowthatafterfiringat1600℃for3hsmallgranularmagnesiumaluminatespinelformsandiswelldistributed,whichenhancesthedensity.

简介：Theγ-Fe2O3nanoparticlescoatedwithDBSandCTABwerepreparedbythemicroemulsionmethod.Thecoatedsamplesshowenhancednonlinearopticalpropertiescomparedwiththeirbulkcouterpart.The.Moessbauerspectraatroomtemperatureweremeasuredforthecoatedferricoxides.Themonolayersoftheorganicmoleculearefoundtohaveastrongchemicalbondwiththesurfaceatomsandthushaveasignificantinfluenceontheelectronstructureofparticlesurface.@1999ActaMetallurgicaInc.

简介：TheAl2O3-SiCcompositepowderswerepreparedinargonatmosphereusingcoalgangueandcarbonaceousmaterials2O3-SiCcompositepowderswereinvestigated.Theresultsindicatethat:temperature,soakingtimeandchlorideadditivehavesignificantinfluenceonthesynthesizedAl2O3-SiCcompositepowders.Basedontheresults,theoptimizedAl2O3-SiCcompositepowders（Al2O358mass%andSiC42mass%）withparticlesized50≤5μmwerepreparedusingcoalgangueandcarbonblackasstartingmaterialsafter3hfiringat1550℃.andproperadditiveadditioncouldreducethetemperatureby50℃.

简介：采用喷雾造粒制备Fe2O3空心球团粒,团粒经过氢气还原得到中空Fe颗粒,通过扫描电镜（SEM）观察Fe2O3空心球团粒及其截面的形貌,研究还原时间对Fe颗粒形貌与截面形貌的影响;采用激光衍射粒度分析仪对Fe颗粒进行粒径分析;采用比表面及孔隙度分析仪表征Fe颗粒的比表面积;采用CSM-MCT显微硬度仪测量空心球状Fe颗粒球壁的硬度和弹性模量。结果表明：Fe2O3空心球团粒和Fe颗粒均为多孔中空球状结构,球壁上存在大量微孔,中空孔直径和球颗粒直径的比值在0.4～0.5;在650℃下还原,随着还原时间增加（4,5,6h）,球壁晶粒逐步长大,中空球状Fe颗粒的比表面积和粒径逐步减小,球壁趋向致密,硬度和弹性模量提高。

简介：Nanosheet(S)andnanoplate(P)γ-Al2O3weresynthesizedbysimplehydrothermalmethodsandemployedassupportsforNicatalystsinCO2methanation.BothofthenanostructuredNi/Al2O3catalystsdisplayedgoodactivity.Incomparison,theNi/Al2O3-ScatalystshowedhigherCO2conversionthantheNi/Al2O3-Pcounterpartatthereactiontemperaturerangingfrom250to400°C.ThephysicalandchemicalpropertiesofthecatalystsweresystematicallycharacterizedbyN2sorption,X-raydiffraction(XRD),highresolution-transmissionelectronmicroscopy(HR-TEM),hydrogentemperature-programmedreduction(H2-TPR)andCO2temperature-programmeddesorption(CO2-TPD)techniques.Higherspecificsurfaceareaandstrongermetal-supportinteractionswereconfirmedontheNi/Al2O3-Scatalyst,whichmayleadtosmallerparticlesizeofNinanoparticles.Moreover,theNi/Al2O3-Scatalystpossessedmoreabundantweakandmediumbasicsites,whichwouldbenefittheactivationofCO2.ThesmallerNisizeandmoresuitablebasicsitesmayrationalizethesuperioractivityoftheNi/Al2O3-Scatalyst.Besides,theNi/Al2O3-Scatalystexhibitedexcellentstabilityat325°Cfor40h.

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

简介：Simplethree-pointbendingtestatambienttemperaturecharacterizedthemechanicalbehaviorofburnedAl2O3-Crefractoriesbeforeandafterthermalshockinassociationwiththeprocessingparameters(graphitecontentandcokingtemperature,etc.).Theresultsshowedthatnon-linearplastic-elasticbehaviorunderloadlowerthancoldmodulusofrupture(CMOR)wasregisteredinallspecimensandreallinearelasticbehaviorcouldbeidentifiedafterthefirstload.Thetotaldeformationcouldbedividedintotwoparts,plasticandelasticareas.ThegraphitecontentandjointbondingsystemofcarbonandceramicphaseswereresponsibleformechanicalbehaviorofAl2O3-Crefractories.

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