简介：Basedonclustervariationmethod(CVM)andnaturaliterationmethod(NIM),order-disorderphasetransitionintheintercalationcompoundsM1/2TiS2issimulatedbycomputer.Thefavorableconditions,underwhich3a0×a0superstructureisformed,aregiven,andtheresultsareingoodagreementwiththeexperimentsandtheoreticalcalculations.TherelationshipbetweencriticaltemperatureandM-ion-vacancyinteractionparameterislinear.

简介：Carbon-coatedlithiummanganesesilicate(Li2MnSiO4/C)nanoparticlesweresynthesizedbypolyolprocess.X-raydiffraction(XRD)patternsoftheobtainedmaterialsexhibitagoodfitwiththatoftheLi2MnSiO4phase.Fieldemissionscanningelectronmicroscopy(FESEM)imagesoftheobtainedsamplesshowthattheparticlesizeisonlytensofnanometers.Thehighresolutiontransmissionelectronmicroscopy(HRTEM)analysisshowsthattheLi2MnSiO4nanoparticlesaresurroundedbyaverythinfilmofamorphouscarbon.Thecompositepreparedthroughpolyolprocessshowsgoodperformanceascathodematerialsinlithiumcellsatroomtemperature.ThechargecapacityoftheLi2MnSiO4/Csamplesis219mAh/g(about1.3Li+perunitformulaextracted),andthedischargecapacityis132mAh/g(about0.8Li+perunitformulainserted)inthefirstcycleinthevoltagerangeof1.5-4.8V.Agoodcapacitycyclingmaintenanceof81.8%after10cycleswasobtained.

简介：这份报纸在极其细小的颗粒的WC-12%Co合金的磁性、机械的性质上处理codopedVC/Cr3C2和sintering温度的效果。结果证明在最佳的比例的做的VC/Cr3C2的synergistic行动提高坚硬和合金的横向的破裂力量(TRS)，与更多的同类的微观结构。当合金是在1430点的sintered时?C并且与0.5%Cr3C2/0.2%VC，TRS到达3786MPa，坚硬是91.7HRA和比0.6m小的谷物尺寸。谷物生长上的数字分析在sintering过程期间证明在WC谷物边界并且Cr3C2溶解在公司上猛抛的两VC分阶段执行减少固体/液体的界面的精力，溶解和降水的过程极大地被延迟，WC谷物变粗被禁止。

简介：本文基于三轴磁阻传感器HMC5983设计了磁记忆检测探头,研制了基于USB2I2C控制模块的二维金属磁记忆检测系统,以45钢为试验对象开展了金属磁记忆试验研究。通过分析磁记忆二维分量以及其微分分量合成的李萨如图大小,确定试件中存在应力集中的严重程度,试验结果表明：磁记忆二维检测不仅能够准确定位试件中应力集中的部位,而且能够从梯度变化角度对应力集中严重程度进行预判评估。

简介：研究VC/Cr3C2对Ti(C,N)基金属陶瓷微观组织和力学性能的影响。利用光学显微镜、X射线衍射仪和扫描电镜结合能谱仪研究微观组织。测试横向断裂强度、硬度和断裂韧性等力学性能。结果表明:微观组织中存在"黑芯-灰壳"和"白芯-灰壳"结构;由于添加VC/Cr3C2,硬质相晶粒变细,添加0.75VC/0.25Cr3C2的金属陶瓷晶粒细化最明显;黑芯随着VC添加量的增加而变细,壳随着Cr3C2添加量的减少而变厚;孔隙率随着VC/Cr3C2中VC的量增加而增大;横向断裂强度和硬度均升高,并且均在添加0.25VC/0.75Cr3C2时达到最大值;按适当的VC和Cr3C2添加量比例添加VC/Cr3C2可以有效地使断裂韧性升高,并在添加0.5VC/0.5Cr3C2时取得最大值。

简介：ThedosimetricphosphorsLi_3PO_4:M(M=Tb,Cu)wereproducedbymodifiedsolid-statemethod.ThestructuralandmorphologicalcharacterizationwascarriedoutthroughX-raydiffraction(XRD)andscanningelectronmicroscope(SEM).Additionally,thephotoluminescence(PL),thermoluminescence(TL)andopticallystimulatedluminescence(OSL)propertiesofpowderLi_3PO_4dopedwithTbandCuwerestudied.ItisadvocatedthatLi_3PO_4:CuphosphornotonlyshowshigherOSLsensitivity(25timesormore)butalsogivesfasterdecayinOSLsignalsthanthatofLi_3PO_4:Tb~(3+)phosphor.Theminimumdetectabledose(MDD)ofLi_3PO_4:M(M=Tb,Cu)phosphorsisfoundtobe21.69×10~(-3)and3.33×10~(-6)J·kg~(-1),respectively.InOSLmode,phosphorshowslineardoseresponseintherangeof0.02-20.00J·kg~(-1).InTLmode,sensitivityofLi_3PO_4:CuphosphorismorethanthatofLi_3PO_4:Tbphosphor.Thekineticsparameterssuchasactivationenergyandfrequencyfactorsweredeterminedbypeakshapemethod,andphotoionizationcrosssectionsofpreparedphosphorwerecalculated.

简介：FluorescenceandcofluorescencepropertiesofTb(Ⅲ)solidcomplexeswerestudiedusingpyromelliticacid(PMA)asligandandfluorescenceinertionsasdopingelements.Thecofluorescenceenhancement,aresultofligandsensitizedfluorescence,wasobservedinTb(Ⅲ)solidcomplexesdopedwithfluorescentinertionsLa(Ⅲ),Gd(Ⅲ),Ca(Ⅲ),andSr(Ⅲ).Theeffectofthetypeandcontentofdopingelementsonfluorescenceenhancementwasstudied,andoptimumconditionsweredetermined.TheresultsshowthatGd(La,Ca,Sr)hasclearcofluorescenceeffectinsolidcomplexTb-M-PMAsystem,andinpresentwork,rareearthcomplexfluorescentpowderthatemitsbrightgreenfluorescenceatultravioletexcitationwasobtained,whichhadpotentialapplicationasfluorescentanti-counterfeitink.

简介：通过C／C复合材料热化学烧蚀机理分析，模拟高温烧蚀条件下的动态热力学行为；引入随机建模理论，确立了损伤单元的极限破坏应变随机场分布参数。通过与高温试验数据相比较。得出高温条件下的损伤演化特征；并以随机损伤理论应用于失效分析，利用不同温度下材料服从随机场分布的失效强度，确定结构各个单元在复杂应力状态下的热结构动态楣伤、失效分布规律。

简介：InordertoimprovetheelectrochemicalcyclestabilityofLa-Mg-Nisystem(PuNi3-type)hydrogenstoragealloy,NiinthealloyswaspartiallysubstitutedbyM(M=Cu,Al,Mn).AnewLa-Mg-NisystemelectrodealloysLa0.7Mg0.3Ni2.55-xCo0.45Mx(M=Cu,Al,Mn;x=0,0.1)werepreparedbycastingandrapidquenching.Theeffectsofelementsubstitutionandrapidquenchingonthemicrostructuresandelectrochemicalperformancesofthealloyswereinvestigated.TheresultsbyXRD,SEMandTEMshowthatthealloyshaveamultiphasestructure,includingthe(La,Mg)Ni3phase,theLaNi5phaseandtheLaNi2phase.Therapidquenchingandelementsubstitutionhaveanimperceptibleinfluenceonthephasecompositionsofthealloys,butbothchangethephaseabundanceofthealloys.Therapidquenchingsignificantlyimprovesthecompositionhomogeneityofthealloysandmarkedlydecreasesthegrainsizeofthealloys.TheCusubstitutionpromotestheformationofanamorphousphaseintheas-quenchedalloy,andareversalresultbytheAlsubstitution.Theelectrochemicalmeasurementindicatesthattheelementsubstitutiondecreasesthedischargecapacityofthealloys,whereasitobviouslyimprovesthecyclestabilityofthealloys.ThepositiveinfluenceofelementsubstitutiononthecyclelifeofthealloysisinsequenceAl＞Cu＞Mn,andnegativeinfluenceonthedischargecapacityisinsequenceAl＞Mn＞Cu.Therapidquenchingsignificantlyenhancesthecyclestabilityofthealloys,butitleadstoadifferentextentdecreaseofthedischargecapacityofthealloys.

简介：Non-stoichiometriccompoundfluoride-dopedLiFePO4/Ccathodematerialsweresynthesizedviasolid-statereactionusingMgF2andAlF3asdopant.Thefluoride-dopedLiFePO4/CsampleswerecharacterizedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),andelectrochemicaltesting.TheresultsshowthatthematerialsarewellcrystallizedandfluoridedopingcannotchangethespacestructureofLiFePO4.SlightamountsofFe2O3withnofluorideimpuritywere...

简介：对多次电镀铬的300M钢试样的疲劳性能、氢脆倾向、疲劳断口进行了测试和分析，以研究镀铬次数、镀铬层厚度对300M钢疲劳性能的影响规律。结果表明：镀铬层对300M钢的疲劳性能影响很大，在试验条件下，带镀层试样较未电镀试样的疲劳强度和相同应力条件下的疲劳寿命降低约60％，且镀层越厚疲劳寿命越低；这种影响与电镀次数无明显关系，只要执行正常的除氢工艺，重复电镀多达15次的300M钢仍未发现氢脆倾向。断口分析表明：疲劳裂纹主要起源于镀铬层或镀层与基体的界面处，疲劳性能的大幅降低主要与镀铬层本身的特性有关。

简介：采用液态磷酸盐浸渍及不同的热处理技术在C/C复合材料表面制备抗氧化涂层。实验结果表明：采用1-2℃/min慢速冷却制备的材料A在700℃氧化20h后的氧化质量损失达到47%，而采用快速气冷技术制备的材料B的氧化质量损失仅仅为0.98%。SEM形貌观察表明：材料A的磷酸盐涂层表面疏松，充满大量孔洞、裂纹，以及片状结晶、团聚的磷酸盐，而材料B的涂层致密、完整，为玻璃态。氧化实验后，材料A的涂层在8h氧化阶段就已消耗殆尽，抗氧化能力基本消失；而材料B的涂层在8h实验后表面涂层完整、致密，无明显损伤，在20h实验后出现了较多的孔洞，抗氧化能力逐渐降低。

简介：2009年10月30日，IPC的3—11CN工作组在深圳召开IPC4101C中文版讨论会。覆铜板行业协会也派人参加了工作组会议。新版IPC-4101C于2009年8月公布，增添了一些新的测试项目和十一个新的产品规格，估计中文版在2010年初就可以面世。

简介：TiO2nanoparticleswithdifferentphasesarepreparedbyhydrolysisoftitaniumtetrabutoxideinthepresenceofHCl.ThecompositionandmicrostructureoftheresultingsamplesarestudiedbyXRDandTEM.TheseresultsshowthattherangeofparticlesizeofTiO2isfrom20to30nm.ThemechanismofTiO2photocatalysisreactionhasbeendiscussedextensively.PhotocatalyticactivitiesofnanometerTiO2arealsoevaluatedbydegradationofthecrystalvioletsolution.ExperimentalresultsindicatethatthesynergisticactionofH2O2andultrasonicwavegreatlyenhancesphoto-catalyticreactionofTiO2.

简介：Iron(Ⅲ)-dopednanostructureTiO2-coatedSiO2(TiO2/SiO2)particleswerepreparedusingthelayer-by-layeras-semblytechniqueandtheirphotocatalyticpropertywasstudied.TiO2colloidsweresynthesizedemployingthesol-gelmethodwithTiCl4asaprecursor.ThesampleswerecharacterizedbyFouriertransforminfraredspectroscopy(FTIR),SEM,EDS,XPS,andXRD.TheexperimentalresultsshowthatTiO2nanopowdersonthesurfaceofSiO2particlesarewelldistributed,theamountofTiO2isincreasedwiththeaddingofcoatinglayers,thepureanatase-TiO2coatinglayersaresynthesizedat500°C,andthephotocatalyticactivityofFe3+-dopedTiO2/SiO2ishigherthanthatofundopedTiO2/SiO2.

简介：Al-5Ti-0.5C-8Sr(集体部分，%)主人合金用一个melt反应方法被准备。微观结构和主人合金的合成过程被光显微镜学，X光检查衍射，扫描电子显微镜学和X光检查调查精力散的光谱。结果证明主人合金由组成一(艾尔)，TiAl3，TiC，Al4Sr和Al-Ti-Sr分阶段执行。主人合金的合成机制如下：TiAl3通过在K2TiF6和艾尔之间的反应被形成在基础材料的部分融化层融化在850个C粒子与同类地分布式的加强在超声的行动和一张契约下面被变成液体filler在团结以后被获得。体积部分原文如此，在契约的粒子能被改变以铜锌金焊接的温度改变。最大值原文如此，契约材料的粒子体积部分在brazi到达了37%？

简介：ThesubmicronpowdermixturesofTiC-TiN-WC-Mo-C-Nisinteredat1400℃orbelowinvacuumwerestudiedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM)analyses.TheresultsshowedthatMo2Cformedat800℃orbelow.BothWCandMo2Cdisappearedat1200℃,andTiNdisappearedat1250℃.Inaddition,thevariationsoflatticeconstantsofthetitaniumcarbonitrideandnickelbinderphasewithsinteringtemperaturewereexperimentallyobtained,andthereasonwasanalyzed.

简介：采用选晶法在真空定向凝固炉中,制备了C含量分别为0.019%、0.048%、0.074%和0.094%的单晶高温合金,合金表面吹沙后分别在1250、1300℃进行真空热处理,研究不同C含量对单晶高温合金再结晶的影响。结果表明:随着合金中C含量升高,碳化物含量增多,其形态由块状转变为骨架状、发达骨架状;随着C含量增加,合金再结晶层深度无明显变化趋势,这表明碳化物对合金再结晶无明显的抑制作用,随着热处理温度升高,再结晶厚层深度明显增加;C对单晶高温合金再结晶抑制作用与形成碳化物的形态和密度有关,在合金表层形成高密度的碳化物,从而对再结晶晶界形成钉扎作用,阻碍晶界的迁移,能够起到抑制再结晶的作用。

简介：Nb-24Ti-18Si-2Al-2Hf-4CrandNb-24Ti-18Si-2Al-2Hf-8Cralloyswerepreparedbyarcmeltinginawater-cooledcrucibleunderargonatmosphere.Microstructuralcharacteristicsandoxidationresistanceofthealloysat1250℃wereinvestigated.Theresultsshowthat,whentheCrcontentis4at%,themicrostructuresconsistof(Nb,Ti)_(ss)andNb_5Si_3;asCrcontentincreasesto8at%,C14LavesphaseCr_2Nbisformed.Theisothermaloxidationtestsshowthattheoxidationkineticsofthetwoalloysfollowsimilarfeatures.Theweightgainsofthetwoalloysafteroxidationat1250℃for100hare235.61and198.50mg·cm~(-2),respectively.Duringoxidation,SiO_2,TiO_2,Nb_2O_5andCrNbO_4areformedatfirst.Then,Ti_2Nb_(10)O_(29)isformedafteroxidationfor20minandbeginstochangeintoTiNb_2O_7astheoxidationproceeds.SiO_2isformedassolidstateatfirstbutlaterevolvesintoglassystatetoimprovethecohesionofthescale.Afteroxidationfor100h,oxidationproductsconsistofSiO_2,TiNb_2O_7,Nb_2O_5andCrNbO_4.

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