简介：将95％Mg＋3％Ni＋2％MnO2混合粉末在行星式高能球磨机中充氢反应球磨100h，利用X射线衍射（XRD）和扫描电镜（SEM）对球磨后的粉体进行表征，并研究其与水反应的动力学性能。结果表明，充氢球磨能对Mg-3Ni-2MnO2进行充分的氢化，Mg全部形成MgH2。制备的氢化态Mg-3Ni-2MnO2复合粉末的颗粒尺寸为0．1～5gm，晶粒尺寸在1～40nm之间。复合物在二次去离子水中水解时，随温度升高，放氢量增加，当温度为343K时，在20min内放出的氢气达到理论放氢量的91-3％，有望成为1种新的安全高效氢源技术。Avrami指数的数值变化表明，氢化态Mg-3Ni-2MnO2复合粉体的水解过程中，不同阶段其水解机理有所不同。

简介：Awhitelong-lastingphosphorCa2MgSi2O7:Dy3+waspreparedbythesolid-statereaction.Astrongbandpeakedat260nmwasshownintheexcitationspectrumof578nmemission,whichmightbeattributedtotheoxygendeficiencyofthehost.Afterirradiatedwith254nmfor4min,thewhiteafterglowofthesamplecouldbeseenfor3h.Moreover,thedepthsandfrequencyfactorsoftrapcenterswerecal-culatedfromthethermo-luminescencecurveofthesample,whichindicatedthatthetrapcenterscorrespondingtothe414Kbandweremorehelpfultothelong-lastingphosphorescence.

简介：对304不锈钢2B板表面边鳞缺陷进行扫描电镜和能谱分析,并结合其整个生产工艺参数分析,得出铁素体当量高是导致边鳞缺陷发生的主要原因。根据上述原因提出了相应的改进建议。

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简介：酒钢2号高炉2013年8月大修开炉后,由于炉型尺寸、部分设备、原燃料条件跟上代炉役不一样,故操作制度不能照搬上代炉役的,需要重新探索适宜的操作制度,指导大修后的高炉生产,优化高炉经济技术指标。

简介：美国宇航局在加州帕萨迪纳的喷气推进实验室研究成功了一种制造YBa2Cu3O7-α高温超导电缆（封装在金属套管内）的新方法。据称,这种方法成本较低,过程易于控制,且对各种前体材料有很强的适应能力。该法分4个步骤:生产具有化学（配）比的前体（Precursor）粉;将前体粉包封在金属套管内;用轧制的方法使前体粉固结;在液态锂金属浴槽内进行处理,使之转变成超导组

简介：TheTiO2nanomembranedopedbyREionswerepreparedbymixingREionsintoTiO2solutionandthephoto-catalyticpropertiesofthecoatingglasswithTiO2membranedopedbyREionstomethylbenzenedegradationunderultravioletwereinvestigated.AFMphotoesshowthatthesurfaceofcoatingglasswithTiO2nanomembranedopedbyCe3+,Ce4+,Y3+arecomposedofparticleswithdiametersof30～50nm.Theresearchesonphoto-catalyticpropertiesprovethatthesurfaceofcoatingglasswithTiO2nanomembranedopedbyREionspossessesgoodphotocatalyticpropertiesunderultravioletandthedegradationpercentsofmethylbenzenearemorethan90%whenthedegradationtimeisshorterthan160min.WhenthemoleratioofCe3+,Y3+,Ce4+toTiO2is0.002thedegradationpercentsofmethylbenzenearerespectively92.85%,91.87%and91.15%under254～365nmultravioletin50μg·ml-1methylbenzenesolution.ThephotocatalyticabilityofthesurfaceofcoatingglasswithTiO2nanomembranedopedbyCe3+underultraviolettodegrademethylbenzeneincreasesastheconcentrationsofREionsincreaseandtheiroptimumpercentageofdegradationare98.50%,97.50%and96.35.5%respectively.Thehighertheconcentrationofmethylbenzenesolutionthelowerthepercentsofthemethylbenzenedegradationofthecoatingglassare,andthebiggertheratiooftheareasofcoatingglasstothevolumeofmethylbenzenesolutionthehigherthedegradationeffectofmethylbenzeneis.

简介：Ceriasphereswithdifferentsizesandsulfurizedproductswithcorrespondingmorphologywerepreparedbyhydrothermalandgas-solidreactionmethodat600–800°CunderCS2atmosphereforashorttime,respectively.Dimensionaleffectinpreparationofγ-Ce2S3wasfirstlyinvestigatedbymeansoftechniquessuchasscanningelectronmicroscopy(SEM),X-raydiffraction(XRD),thermalgravimetricanalysis(TGA)andspectrophotometer.Theresultsshowedthatwhenceriananoparticleswithsmallsizewereusedasprecursors,theγ-Ce2S3couldbepreparedatthelowertemperatureandthebadlysinteredproductswereobtained;whenceriananoparticleswithlargesizewereemployedasprecursors,pureγ-Ce2S3wasdifficultlyobtainedevenifthetemperaturewasupto800°Candtheproductstendedtokeeptheiroriginalsize.Theheat-resistancepropertyoftheγ-Ce2S3withlargesizewasbetterthanthesmallerone,andthepureγ-Ce2S3preparedfromprecursorwithsmallsizehadagoodpigmentaryperformance.

简介：1提高风温的作用高炉所消耗的热量中,有20%来自于风温,风温是煤气返回高炉的再使用,是节能的标志,同时由于风温的使用,使得高炉下部温度充足,渣铁物理热充沛,对维护炉况有极大

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简介：经过槽下系统的设备改造,实现了槽下过筛,入炉粉率降低,为一系列的技术进步提供了基础保障,阐述了各项生产技术进步与生产实践.

简介：Thedifferencesofreductionbehaviorsbetweenironorelumpandpelletswerestudiedbyconductinglowtemperaturereductiondegradation,staticloadreductionanddroplettests.Thesetestssimulatedtheconditionsofreductiontemperatureandhydrogen-containinggasinCOREX.Duetoitsdensestructureandlowporositycomparedwithpellets,lumporepossessespoorreductiondegradationindex(RDI)andslowerreductionrateinearlyandmediumreactionstages,showingsignsoflowerstrength,lowersofteningandmeltingtemperatures,aswellasawidermeltingzoneandhigherΔP.Thatprovidessomebasistoexplainthephenomenaofdifferentialpressurerise,metallizationdeclineandmorestickingaftertheusageoflumporeinCOREXplant.

简介：CeO2nanoparticles(nano-CeO2p)wereaddedintolasercladdedNiCoCrAlYcoatingsonNi-basedsuperalloysubstratetoimprovethemicrostructureandproperties.Scanningelectronmicroscope(SEM),X-raydiffractometer(XRD),micro-hardnesstester,andheattreatmentfurnacewereemployedtoinvestigatetheirmorphologies,phases,micro-hardnessandthermalshockresistance,comparedwiththecoatingwithoutnanoparticlesadded.Theresultsshowedthatthemicrostructureandpropertiesofthecoatingswiththeaddition...

简介：Inthepresentstudy,sampleswereextensivelycollectedthroughoutthestainlesssteelmanufacturingprocess.Thethree-dimensionalmorphologyofinclusionswasrevealedbynon-aqueoussolutionelectrolysis.Thehighconcentrationofaluminuminferrosiliconcausedtheincrementof[Al]sinsteelandAl2O3ininclusions,whichledtothehighermeltingtemperatureofinclusions.ItwasconcludedthattheapplicationoflowAlferrosiliconandcalciumtreatmentcouldpreventtheformationofAl2O3-richinclusions.

简介：随着国家环保政策的逐步落实,＂十二五期间＂将有更多钢铁企业开始实施烧结烟气脱硫项目,市场上较成熟的脱硫技术主要是应用于燃煤电厂的,目前在烧结烟气脱硫领域尽管有不少脱硫技术应用,但是还存在不少局限性。本文以氨法脱硫技术在南钢炼铁新厂360m2烧结烟气脱硫中的实际应用为例阐述了氨法脱硫技术的应用情况,进一步探讨氨法脱硫技术在烧结烟气脱硫领域的应用前景。

简介：对梅钢2号高炉封炉后的开炉快速达产实践进行了总结。实践表明,通过进行充分的开炉准备,实施科学合理的开炉方案以及精心地操作调剂,高炉顺利开炉,3d快速达产。

简介：AseriesofLa2O3/MCnylonnanocompositeswerepreparedviainsitupolymerization.Theeffectsofcontentofnano-La2O3onthemechanicalpropertiesofnanocompositeswerestudied.Dispersionofnano-La2O3inMCnylonmatrixwasobservedwithSEM.ThecrystalstructureofnanocompositeswascharacterizedbymeansofXRD.SEManalysisshowsthatLa2O3nanoparticlesareuniformlydispersedinMCnylonmatrixandlittleclusteringexistswhenthecontentofnano-La2O3islowerthan1%,however,whenthecontentofnano-La2O3ismorethan1%,itbeginstocluster.XRDanalysisindicatsthatnano-La2O3doesnotchangethecrystalstructureofMCnylon.Mechanicalpropertiestestsshowthatthetensilestrength,elongationatbreak,impactstrength,flexuralstrength,andflexuralmodulusofnanocompositesfirstincreasethendecreaseasthecontentofnano-La2O3isincreased.Whenthecontentofnano-La2O3is0.5%,thetensilestrengthandelongationatbreakofnanocompositesreachmaximum,whichare17.9%and52.1%higherrespectivelythanthoseofMCnylon.Whenthecontentofnano-La2O3is1.0%,theimpactstrength,flexuralstrengthandflexuralmodulusofnanocompositesreachmaximum,whichare36.6%,12.7%and16.3%higherrespectivelythanthoseofMCnylon.

简介：选烧厂1#2#烧结机蒸汽预热的使用,对提高混合料料温起到一定积极作用,同时对烧结机固体燃料消耗、能源消耗、烧结成本等造成一定的波动,本文主要通过对烧结技术经济指标的分析研究,摸索蒸汽预热的使用对实际烧结生产的影响。

简介：采用压痕裂纹(IM)法测定了无压烧结ZrO2基陶瓷的断裂韧性(K1c),并引入相对偏差概念表征K1c值的精确度.结果表明,由于ZrO2基陶瓷的压痕裂纹具有巴氏裂纹特征,因而只能选择Niihara(P)方程(P表示巴氏裂纹)、Shetty方程、Laugier方程或Marshall方程等来计算K1c.其中,用Niihara(P)压痕方程计算的K1C值最符合实际,且具有最小的相对偏差.因此,正确判断压痕裂纹类型、选择合适的压痕方程及科学处理实验数据等,都将有利于提高压痕断裂韧性的测定精度.

简介：CO2emissionofthesteelindustrytakesupagreatproportionofthetotalemissionoftheworld.ItisnecessarytoreducetheCO2intensityofsteelproductsinordertosaveenergy,protecttheenvironmentandkeepasustainabledevelopmentinthesteelindustry.Basedontheresearchofsteelproducts'lifecycleinventory,thosewhoconductedthisresearchhavefocusedontheanalysisofCO2emissionfactorsandmeasures.Adoptingthelifecycleinventorymodelofacertainsteelmakingsite,togetherwiththeTornadoChart,theresearchershaveidentifiedsignificantfactors,providedsomeexplanation,andsuggestedsomepossiblemeasurestoreduceCO2emission.TheresultshaveshownthatthemostimportantfactorsaretheCO2intensityofblastfurnacegas(BFG),hotmetalratioofbasicoxygenfurnace(BOF)andthematerialutilizationefficiency.Accordingly,somemeasuressuchasremovingCO2inBFG,decreasingthehotmetalproportioninBOF,andimprovematerialutilizationefficiencyineachprocess,maybetakentodecreaseCO2emission.