简介：EffectofCe-Mg-Si(lightRE)andY-Mg-Si(heavyRE)nodulizersonthemicrostructuresandmechanicalpropertiesofheavysectionductileironwasinvestigatedtodevelopthematerialofspent-nuclear-fuelcontainers.Twoas-castsweretreatedbythesamequalitypercentageoflightREandheavyRE,respectively.Fourpositionswerechosentostandfordifferentsolidificationcoolingratesofspecimens.Thetensilestrength,elongationandimpacttoughnessofspecimenstreatedbyheavyREwereallhigherthanthoseofthespecimenstreatedbylightRE.Withthedecreaseofcoolingrate,themechanicalpropertiesoftwospecimensdecreased,andthefracturemorphologychangedfromductilefracturetobrittlefracture.TheimprovingeffectofmechanicalpropertiesbetweenheavyREandlightREwasobviousduetothebetteranti-degradationpropertyofheavyRE.Whilethesolidificationprocesslastedformorethan250min,theimprovingeffectwasnotobviousduetoseriousspheroidalizationdecaying.

简介：MagnesiumalloyEZ10(Mg-RE-Zn)wasdeformedintensionattemperaturesfrom20upto520°C.Arapiddecreaseoftheyieldandtensilestrengthwithtemperaturewasobservedattemperatureshigherthan300°C.Ontheotherhand,ductilityofsamplesrapidlyincreasedinthesametemperaturerange.Lightmicroscopyandscanningelectronmicroscopywasusedtorevealthereasonforthesebehaviours.Intermetallicparticlesingrainboundariesareresponsibleforexcellentmechanicalpropertiesatlowertemperatures.Diffusionalprocessesoccurringattemperatureshigherthan300°Csignificantlyinfluencedthedeformationmechanismaswellasthefracturecharacter.

简介：通过光学显微镜、扫描电镜、室温力学性能及电化学腐蚀测试，研究固溶时间对Al-8.54Zn-2.41Mg-xCu（x=2.2,1.3）超强铝合金组织与性能的影响。结果表明，固溶时间延长，合金基体中残余结晶相的数量显著减少，再结晶体积分数增加，电化学腐蚀电位正移。固溶时间为60min时，Cu=1.3%（质量分数）合金的强度和抗腐蚀性能均高于Cu=2.2%合金。当固溶时间延长至180min时，Cu=2.2%合金的抗拉强度和屈服强度略有提高，Cu=1.3%合金强度降低；高铜含量合金剥落腐蚀程度减少，低铜合金剥落腐蚀程度增加，且高铜合金的抗腐蚀性能高于低铜合金。适当缩短固溶时间，能够提高低铜合金的强度和抗腐蚀性能。在相同的固溶条件下，2种合金的电化学腐蚀电位相差不大。

简介：采用碱熔处理样品，酸化后，移取部分溶液稀释后引入ICP测定ZrO2、TiO2、Fe2O3含量，剩余溶液用强碱分离钛、铁、锰等干扰元素后，EDTA—CuSO4法返滴定Al2O3，终点明显，检测重现性好；

简介：Ca-dopedBaMgAl10O17:Eu2+,Mn2+(BAM)bluephosphorsweresynthesizedbyfluxassistedsolid-statereactionmethodusingCaF2andBaF2asco-flux.GooddispersityandparticlesizehomogenizationofhexagonalpurephaseBAMwereobtainedbysinteringat1400℃.TheeffectsoftheCa2+ionscontentonthestructure,morphologyandphotoluminescencepropertiesofthephosphorswerestudied.TheresultsindicatedthattheincorporationofCacoulddecreasethelatticeconstant,improvethehomogeneityanddispersityandenhancethephotoluminescence(PL)intensityofthephosphoreffectively.TheoptimumBa0.86Ca0.04Mg0.97Al10O17:0.1Eu2+,0.03Mn2+PLintensitywasenhancedforabout30%andrelativebrightnesswasimprovedabout4%.Furthermore,thesynthesizedBAMandcommercialBAMphosphorswereannealedfor30minat600oCinair.TheCa-dopedphosphorshadstrongeremissionintensity,higherbrightnessandbetterchromaticitystabilitythanthatofthecommercialphosphor.TheseresultsindicatedthatCa-dopedbluephosphorshadgoodpotentialapplicationsinthecommercialtricolorfluorescentlampsaswellasinotherdisplayandlamps.

简介：AseriesofCe0.5Fe0.30Zr0.20O2catalystswerepreparedbydifferentmethods(co-precipitationsmethod,citricacidsol-gelmethod,impregnationmethod,physicalmixedmethod,andhydrothermalmethod)andcharacterizedbyX-raydiffraction(XRD),Ramanspectroscopy,Brunauer-Emmett-Teller(BET)andH2-TPRmeasurements.Potentialofthecatalystsinthesootoxidationwasevaluatedinatemperature-programmedoxidation(TPO)apparatus.TheresultsshowedthatalltheFe3+andZr4+wereincorporatedintocerialatticetoformapureCe-Fe-Zr-Osolidsolutionfortheco-precipitationsample,buttwokindsofFephasesexistedintheCe-Fe-Zr-Ocatalystspreparedbyothermethods:Fe3+incorporatedintoCeO2latticeanddispersedFe2O3clusters.ThefreeFe2O3clusterscouldimprovetheactivityofcatalystsforsootoxidationcomparingwiththepureCe-Fe-Zr-OsolidsolutionowingtothesynergeticeffectbetweenfreeFe2O3andsurfaceoxygenvacancies.Inaddition,theactivityofcatalystsstronglyreliedonthesurfacereducibilityoffreeFe2O3particles.HoldingbothabundantfreeFe2O3particlesandhighoxygenvacancyconcentration,thehydrothermalCe0.5Fe0.3Zr0.2O2catalystpresentedthelowestTi(251°C,ignitiontemperatureofsootoxidation)andTm(310°C,maximumoxidationratetemperature)forsootcombustion(withtight-contactbetweensootandcatalysts)amongthefivesamples.Evenafteragingat800°Cfor10h,theTiandTmwerestillrelativelylow,at273and361°C,respectively,indicatinghighcatalyticstability.

简介：Praseodymium(Pr)wasimpregnatedtoCeO2-ZrO2solidsolutionbyanimpregnationmethod.Theas-obtainedPrmodifiedCeO2-ZrO2wasimpregnatedwith1wt.%Pdtopreparethecatalysts.ThestructureandreducibilityofthefreshandhydrothermallyagedcatalystswerecharacterizedbyX-raydiffraction(XRD),Raman,X-rayphotoelectronspectroscopy(XPS),COchemisorptionandH2temperature-programmedreduction(H2-TPR).Theoxygenstoragecapacity(OSC)wasevaluatedwithCOservingasprobegas.EffectsofimpregnatedPronthestructureandoxygenstoragecapacityofcatalystswereinvestigated.TheresultsshowedthattheagedPr-impregnatedsampleshadmuchhigherOSCandbetterreducibilitythantheunmodifiedones.TheschemeofstructuralevolutionsofthecatalystswithandwithoutPrwasalsoestablished.PartialoftheimpregnatedPrdiffusedintothebulkofCeO2-ZrO2duringageing,whichinhibitedthesintering,andincreasedtheamountofoxygenvacanciesinCeO2-ZrO2support.Furthermore,thoseimpregnatedPrspecieswhichcoveredonthesurfaceofthesupportobstructedthestrongmetal-supportinteractionbetweenPdandCesoastoreducetheencapsulationofPdaswellasthebackspill-overoftheoxygenduringthecatalyticprocess.

简介：通过金相显微镜（OM）、扫描电镜（SEM）和动态热机械分析仪（DMAQ800）等分析手段研究粉末冶金法制备的Ti-47Al-2Cr-2Nb-0.2W（原子分数，%）合金微观组织对其阻尼性能的影响。研究结果表明：Ti-47Al-2Cr-2Nb-0.2W合金初始组织为近γ组织，其阻尼性能最差，在振幅为100μm时，损耗因子仅为0.007；在1330℃下保温15min空冷可获得细小全层片组织，层片晶团的平均尺寸约为200μm，其损耗因子在振幅为100μm时达到0.012。随温度升高或保温时间延长，层片尺寸和晶团尺寸明显增大，合金阻尼性能下降，保温120min时层片晶团的平均尺寸约为510μm，其损耗因子在振幅为100μm时为0.009。细小全层片的阻尼性能最好，而双态组织的阻尼性能介于近γ组织和细小全层片组织之间。

简介：混合氧化物(Ce0.6Zr0.4O2)由帮助微波的加热一起沉淀准备了的CeO2-ZrO2被用作支持经由早期湿的受精的方法与各种各样的CuO内容(0wt.%15wt.%)准备一系列CuO/Ce0.6Zr0.4O2催化剂。获得的CuO/Ce0.6Zr0.4O2样品被N2吸附，XRD，拉曼，TEM和H2-TPR技术，和他们的催化活动描绘因为公司氧化被调查。结果证明CuO/Ce0.6Zr0.4O2催化剂的活动被CuO的内容强烈影响，并且有10wt.%CuO的催化剂在公司氧化展出了最好的催化活动，它能在催化剂被归因于CuO，和高氧空缺集中的高分散和reducibility。

简介：Eu2+andDy3+codoped(Ca,Sr)7(SiO3)6Cl2yellowphosphorsweresuccessfullysynthesizedbyself-fluxmethod.Thestructure,morphologyandphotoluminescencepropertieswereinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andphotoluminescencespectra.Theas-preparedphosphorshowedabroademissionspectrumcenteredat550nmforEu2+single-dopedphosphor,whilelocatedat548–544nmfortheEu2+,Dy3+codopedsamplesunderexcitationat380nmlight.TheemissionintensitywasgreatlyimprovedwhenDy3+wasdopedintothe(Ca,Sr)7(SiO3)6Cl2:Eu2+system.Thecomposition-optimizedsamplewith3mol.%ofDy3+andconstant10mol.%ofEu2+exhibiteda220%PLenhancementcomparedtothephosphorwith10mol.%Eu2+single-doped.Meanwhile,itwasfoundthatthequantumefficiencyofphosphornamely(Ca,Sr)7(SiO3)6Cl2:3mol.%Dy3+,10mol.%Eu2+couldgetupto24.6%.Thesynthesizedyellow-emitting(Ca,Sr)7(SiO3)6Cl2:Dy3+,Eu2+isapromisingcandidateashigh-efficiencyyellowphosphorforNUV-excitedwhiteLEDs.

简介：Aseriesofnovelbluelong-lastingphosphorescencephosphorsSr6Al18Si2O37:Eu2+,RE3+(RE3+=Ho3+,Gd3+,Dy3+andPr3+)werepreparedbytheconventionalhigh-temperaturesolid-statereactioninareductiveatmosphere.TheirpropertiesweresystematicallyinvestigatedutilizingX-raydiffraction(XRD),photoluminescence,phosphorescenceandthermoluminescence(TL)spectra.ThephosphorsemittedbluelightthatwasrelatedtotheemissionofEu2+dueto5d-4ftransition.Brightbluelong-lastingphosphorescence(LLP)couldbeobservedaftertheexcitationsourcewasswitchedoff.Fortheoptimizedsample,thebluelong-lastingphosphorescencecouldlastfornearly4hinthelightperceptionofthedark-adaptedhumaneye(0.32mcd/m2).TheeffectsofRE3+ionsonphosphorescencepropertiesofthephosphorswerestudied,andtheresultsshowedthattheco-dopingofRE3+ionsgreatlyenhancedtheintensityofthepeakaround315Kwhichwasrelatedtothelonglastingphosphorescenceofthephosphorsatroomtemperatureandconsequentlyimprovedtheperformanceofthebluephosphorescencesuchasintensityandpersistenttime.

简介：采用电化学两步反应在纯钛基体表面制备K2Ti6O13/TiO2复合涂层,对其形貌、相组成和电化学耐腐蚀性能进行研究,并与传统化学方法制备的涂层进行比较。结果表明,电化学法制备的涂层为多孔网状结构,由内层阻碍层和外层多孔层的双层膜组成,可抑制Ti基体过钝化时的O2析出;KOH电解液作用时,随电流密度增加,涂层阻抗值减小,多孔层厚度逐渐增加;电流密度大于20mA/cm^2时,涂层发生脱落,但其耐腐蚀性能仍高于化学方法制备的涂层。因此通过电化学方法制备的涂层可改善Ti基体的腐蚀行为,使其具有更优异的耐腐蚀性能。

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。

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：针对方大特钢公司60Si2Mn弹簧扁钢产品出现剪切端面裂纹问题,进行裂纹检测、剪切温度试验和不同温度下力学性能检测;分析发现剪切时的温度对裂纹产生的影响,发现剪切裂纹是剪切应力作用于偏析较严重部位形成的裂纹源在残余应力释放过程中扩展形成的横向裂纹.根据分析结果,在生产实践中分别对炼钢、轧制工序采取相应措施,有效控制了弹簧扁钢的剪切端面裂纹.

简介：介绍了原料工段新区S2皮带机的改造过程,通过重新核算S2皮带机驱动装置,并更换驱动装置,极大地降低了S2皮带机的设备故障率,满足了生产要求,且大大地减少了备件消耗,节约了生产成本。

简介：260区的2号烧结机自2011年12月份投产以来,烧结机台车整体往北跑偏(烧结机机头方向为东边,机尾方向为西边),设备使用寿命不能保证,隐患较大,严重影响了烧结厂的正常生产。为此必须采取有效措施,对烧结机进行纠偏调整。

简介：为达到国家对钢铁行业能耗指标的要求，酒钢选烧厂通过改善混合料粒度组成，研究料层燃料分布状况，降低了1#、2#烧结机燃料消耗。

简介：以异丙醇铝为前驱体，HNO3为胶溶剂，采用溶胶-凝胶法制备Al2O3膜。考察HNO3浓度对溶胶及薄膜的影响，通过TG-DTG，XRD，AFM，BET等表征手段对溶胶的稳定性及黏度，薄膜的热稳定性，物相组成，表面形貌，微孔结构及分布等进行综合分析。结果表明：随HNO3浓度增大，溶胶黏度增大，HNO3浓度为5mol/L时溶胶发生团聚；薄膜的热稳定性较好，高于500℃加热薄膜几乎没有质量损失；随烧结温度升高，薄膜中的γ-AlOOH逐渐向γ-Al2O3转变，薄膜因此变得更加稳定；薄膜表面较为平整，微孔分布均匀，平均孔直径为4.22nm。

简介：2#LF炉水冷炉盖作为设备中的易损耗件，由于长期受高温烟气的烧损，极有可能造成局部漏水长期影响生产。鉴于其结构复杂，整套成本高，更换难度大，检修成本高。为了更好的确保生产顺利进行，对其进行一定改造以增加其使用周期，降低使用成本。本文以2#LF炉水冷炉盖为基础，结合其结构特点，完善设备功能，有效利用其剩余成本，提高使用周期，对2#LF炉水冷炉盖提出合理化改造。