简介：采用直流电弧等离子体法蒸发Mg＋5%TiO2的混合物并将其在空气中钝化,制备粉体Mg-TiO2复合储氢材料。利用电感耦合等离子光谱发生仪（ICP）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）表征粉体复合材料的成分、相组成及形貌。采用压力–成分–温度（PCT）和差示扫描量热仪（DSC）对Mg-TiO2样品的吸放氢性能进行研究。由PCT测量结果可知,Mg-TiO2复合粉体中镁的氢化焓和氢化熵分别为-71.5kJ/mol和-130.1J/（K·mol）,而粉体的氢化激活能为77.2kJ/mol。结果表明,采用电弧等离子体法在超细镁颗粒中加入TiO2催化剂可显著增强镁的吸放氢动力学性能。

简介：TherelationshipofelectricalpropertiesofMn-dopedBa0.92Ca0.08TiO3PTCR(positivetemperaturecoefficientresistance)ceramicswithtwosinteringscheduleswasdiscussed.UsingTEM(transmissionelectronmicroscope)combinedwithEDS(energydispersiveX-rayspectrometer),theMnionsdistributedatgrainboundarieswereanalyzed.TheresultsshowthatthePTCReffectofMn-dopedPTCRceramicsismoredependentonthesinteringschedulethanthoseofMnfree.ThephenomenonmaybecausedbythevalencestatesvarianceofMnionssegregatedatthegrainboundaries.

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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简介：介绍一种金属/合金的生产方法,用于恒电流和恒电位条件下由混合硫化物(Cu2S,NiS)生产Cu-Ni合金,称为直接电化学还原(DER)。研究槽电压和槽电流等工艺参数对还原得到的化合物组成的影响,以生产工业所需的CuNi10,CuNi20和CuNi30等合金。在1200°C下采用循环伏安法(CV)考察Cu2S和NiS在CaCl2熔体中的电化学行为。根据CV研究结果,Cu2S的阴极还原是一步完成的,即Cu2S?Cu;NiS的阴极还原则分两步进行,即NiS?Ni3S2?Ni。恒电流研究表明,在10A电流下电解15min,可制备出最高硫含量为320×10-6的高纯CuNi10合金。扫描电子显微镜以及能量色散X射线能谱和光学发射光谱(OES)测试结果表明,在2.5V电压下直接电化学还原15min,可制备出杂质含量低(即硫含量小于60×10-6)的所选成分的Cu-Ni合金。

简介：本文采用磁粉、X射线、CT和超声等无损检测和金相分析等方法对40CrNi2Si2,MoVA钢制零件的磁痕显示进行了系统分析。研究认为，40CrNi2Si2MoVA钢制零件的磁痕显示为显微成分沿变形方向偏析导致的马氏体转变点Ms差异所致。显微成分偏析是钢锭结晶过程中不可避免的，但可通过优化熔炼工艺参数降低显微偏析的程度。本文还分析了四种磁痕显示的类型及其判别方法。

简介：Themetal-organicchemicalvapordeposition(MOCVD)techniqueisapromisingprocessforhigh-temperaturesuperconductorYBa2Cu3O7-δ(YBCO)preparation.Inthistechnique,itisachallengetoobtainbariumprecursorswithhighvolatility.Inaddition,thepurity,evaporationcharacteristics,andthermostabilityofadoptedprecursorsinwholeprocesswilldecidethequalityandreproducibleresultsofYBCOfilm.Inthepresentreport,bis(2,2,6,6-tetramethyl-3,5-heptanedionato)barium(Ⅱ)(Ba(TMHD)2)wassynthesized,anditsstructurewasidentifiedbyFTIR,1HNMR,13CNMR,andESI-MSspectroscopy.Subsequently,thethermalpropertiesandthekineticsofdecompositionweresystematicallyinvestigatedbynonisothermalthermogravimetricanalysismethods.BasedontheaverageapparentactivationenergyevaluatedbytheOzawa,Kissinger,andFriedmanmethods,thevolatilizationprocesswasdiscussed,andallresultsshowthatBa(TMHD)2isunstableandhighlysensitivetothechangeoftemperatureduringthewholeevaporationprocess.Therefore,itisveryimportanttochoosesuitablevolatilizationtechnologyandconditionsforavoidingBa(TMHD)2break-down(orthermalaging)duringMOCVDprocess.Subsequently,thepossibleconversionfunctionisestimatedthroughtheCoats-Redfernmethodtocharacterizetheevaporationpatternsandfollowsaphaseboundaryreactionmechanismbythecontractingsurfaceequationwithaverageactivationenergyof118.7kJ.mol-1.

简介：在这份报纸，纺纱冰上的无磁性的Y离子的冲淡效果加重Dy2Ti2O7由红外线并且拉曼系列和磁化大小被调查。与温度弄软减少的异常声子在父母被发现并且冲淡除了之外，做的混合物，和Y能放松弄软声子233附近的红外模式?厘米<啜class=“a-plus-plus”>显示在纺纱冰材料联合的强壮的phononphonon的1,。当冲淡的水平不很高时，磁化大小表明无磁性的杂质严重地不处于扎根的状态影响纺纱冰规则。然而，大量冲淡提高混乱并且因为集体旋转扭动簇不再是可得到的，打破纺纱冰状态。

简介：起落架40CrNi2Si2MoVA钢螺桩在安装一段时间后发生了断裂。为确定螺桩断裂的原因，对断裂螺桩断口宏微观形貌、断裂螺桩及对比件的氢含量、材料的性能以及表面损伤等因素进行了检查，并对电镀工艺进行了评定。结果表明，裂纹主要起源于第一螺纹根部的机械损伤部位，源区以沿晶断裂特征为主，断裂件含氢量较高。综合分析认为。螺桩断裂性质为氢致延迟断裂，表面机械损伤对氢吸收和扩散的促进作用和40CrNi2Si2MoVA钢材料高强度所致的高氢脆敏感性是导致断裂的主要原因。

简介：通过基于密度泛函理论的第一性原理计算方法,对MgCu2,Mg2Ca和MgZn2的力学性能和电子结构进行计算,计算所得晶格参数与实验值和文献值相吻合。合金形成热和结合能的计算结果表明,MgCu2具有最强的合金形成能力和结构稳定性。计算了MgCu2,Mg2Ca和MgZn2的弹性常数,推导了体模量、剪切模量、弹性模量和泊松比。结果表明,MgCu2、Mg2Ca和MgZn2均为延性相,MgCu2的刚度最大,MgZn2的塑性最好。通过对结合能和弹性常数的计算,预测了MgCu2、Mg2Ca和MgZn2的熔点。通过对态密度（DOS）、Mulliken布居数、电子占据数和差分电荷密度的计算,分析了MgCu2、Mg2Ca和MgZn2的结构稳定性和力学性能机制。最后,计算和讨论了3种金属间化合物的Debye温度。

简介：双面挠性覆铜板CN201238419／申请人／伍宏奎昝旭光／广东生益科技股份有限公司一种双面挠性覆铜板，包括：聚酰亚胺层、压合于聚酰亚胺层一面的压延铜箔、以及压合于聚酰亚胺层另一面的电解铜箔。本实用新型的双面挠性覆铜板为三层两面挠性覆铜板，于聚酰亚胺的两面采用两种不同类型的铜箔材料，

简介：Thesegregationanddiffusionofboronduringheattreatmentswerestudied.Theinfluenceofboroncontents,agingtimeandappliedstressonFeMo2B2formationwasalsostudied.Finally,theeffectsofboroncontentsandFeMo2B2formationonthehightemperaturestrengthwerestudied.Boronatomsweresegregatedtoprioraustenitegrainboundaryduringnormalizingtreatment.Andtheseboronatomswereslowlydiffusedintothegraininteriorduringtemperingandagingat700℃.TheFeMo2B2phasewasonlyformedafter1,000hagingat700℃inalloycontaining196ppmboron.TheformationofFeMo2B2phaseisacceleratedbytheappliedstress.ItwasexpectedthattheformationofFeMo2B2iscloselyrelatedtotheredistributionofboronatoms.Thetensilestrengthsat700℃areincreasedwiththeincreaseofboroncontents.However,theformationofFeMo2B2phaseresultsinlowertensilestrength.

简介：TheeffectofyttriaonthesolidreactionmechanismofaCaHPO4·2H2O+CaCO3systematdifferenttemperatureswasexperimentallystud-ied.Thesampleswithandwithoutyttriaweresubjectedtothermogravimetric/differentialscanningcalorimetrymeasurement.ThesampleswereheattreatedatthetemperaturescorrespondingtothepeaksontheDSCspectra,andtheresultedphasecompositionswereidentifiedbyX-raydiffraction.Thetransformationmechanismwasdeducedbycomparingthephasesobtainedatdifferenttemperatures.Theresultsshowthatthetransformationsatbelow1073Karenotaffectedbyyttria,butallthoseatabove1073Karecompletelyaltered.Theformationtem-peratureofhydroxyapatitedecreasesby134K,andthedecompositiontemperatureincreasesby38K.ThepolymorphoustransformationofCa3(PO4)2fromβphasetoαphaseincreasesby47K.Thethermodynamicpropertiesofthetransformationsatabove1073Karealsomodi-fiedbytheadditionofyttria;thatis,theendothermalpeaksaresubstitutedbyexothermalpeaks.

简介：微米大小的Sr2(P2O7):Ce，Tb绿黄磷被与它的先锋在不同温度被退火准备综合了由一同沉淀(NH4)在周围的温度的2HPO4。黄磷的阶段结构，谷物尺寸，表面形态学，和光性质被X光检查衍射调查，扫描电子显微镜，传播电子显微镜，和荧光光谱。先锋的产品在1,100点退火了的结果表演??‰浮???匠??伲?????畅？？

简介：为提高硼的去除率，研究了电磁感应精炼过程中硼杂质在CaO-SiO2-BaO-CaF2四元渣和熔硅之间的分配系数LB，讨论了四元渣系中CaO/SiO2质量比、BaO和CaF2含量、熔炼时间对LB的影响规律。结果表明：随着CaO.SiO2渣中BaO和CaF2含量的增大，LB值增大。当CaO/SiO2质量比为1.1:1、BaO和CaF2含量分别为15%和20%时，CaO.SiO2.BaO.CaF2四元渣去除熔硅中硼杂质效果最好，LB达到最大值6.94，并且LB随着熔炼时间的延长而增大。经过两次造渣后，熔硅中硼含量由3.5×10.5降到3.7×10.6，硼的去除率达到89.4%。

简介：Inviewoftheimportanceofsolventextractionofrareearthmetalswiththeacidicorganophosphorousreagent,thedevelopmentofachemicallybasedmodelapplicabletohighconcentrationisdesired.Inthepresentstudy,theequilibriumdistributionofdysprosium(Ⅲ)betweenanaqueousnitricacidsolutionand2-ethylhexylphosphonicacidmono-2-ethylhexylester(PC88A)wasmeasuredintherangeofaninitialaqueousdysprosium(Ⅲ)concentrationfrom1.0×10-3to1.0×10-1kmol/m3andPC88Aconcentrationfrom0.16to0.65kmol/m3inShellsolD70asthediluent.Theobtaineddatawereanalyzedusingthechemicallybasedmodelinordertocorrelatetheequilibriumdistributionratios.Inthismodel,dysprosium(Ⅲ)wasassumedtobeextractedwiththePC88Adimerasa1:3complex,theactivitieswereconsideredfortheaqueousspecies,andtheeffectiveconcentrationofthePC88AdimerwascalculatedusingAlstad'sempiricalequation.Asaresult,theapparentextractionequilibriumconstantwasdeterminedtobe253(kmol·m-3)-2withanexcellentcorrelationbetweentheexperimentandcalculationresultsinthewiderangeofthelogarithmofthedistributionratiofrom-2to3.5.Inconclusion,themethodologyinthismodelwouldbeeffectiveforquantitativedescriptionofsolventextractionbehaviorofgeneralrareearthelementsaswellasdysprosium.

简介：采用扫描电镜、能谱仪以及X射线衍射仪对具有WC＋β（β为钴基粘结相）两相结构的WC-11Co-0.71Cr3C2-0.06RE（RE为含La、Ce、Pr、Nd的混合稀土）硬质合金烧结体表面进行观察与分析。结果表明，在烧结过程中合金中的La、Ce、Pr、Nd通过定向迁移与烧结炉内气氛中的S、O等杂质元素结合，在合金烧结体表面形成RE2S3（主）和RE2O2S（少量）弥散相。从合金中Cr3C2的热力学稳定性、Cr在Co中的溶解度特性以及稀土原子激发等3个方面，对稀土迁移活性的激发机制和稀土原子的定向迁移机制进行分析与讨论。

简介：Byuseofmicro-DTAtechniqueaswellasambientandhightemperatureX-rayanalysisthephasediagramofNaCl-CaCl2hasbeenchecked.Itis.asimpleeutecticsystemwithasolidsolubilityinthesodiumchlorideside.Theeutecticpointisat773K,49mol%NaCl.Theexperimentalresults,especiallythoseoftheX-raydiffractionstudieshaveshowedthattheincongruentcompound4NaCl-CaCl2doesnotexistintheNaCl-CaCl2system.

简介：SiO2气凝胶及纤维复合SiO2气凝胶材料因轻质、高效、导热系数低等优点在保温隔热领域备受关注,应用前景广阔。其隔热性能、力学性能与微观结构、化学组成密切相关。本文对现阶段常见的微观结构、隔热性能、力学性能的表征方法做了介绍,常见的有密度、疏水角、晶态结构、微观形貌、比表面积及孔径分布、导热系数、化学组成、热稳定性、抗弯抗压等。综述了以上各种表征方法存在的优缺点及表征参数变化说明的问题。各种表征方法得到的表征参数之间存在紧密联系,需要从多角度理解和分析。

简介：ThelongafterglowSrAl2O4:Dy,Euphosphorisliabletohydrolyzeinwaterwithdeteriorationoftheluminescentproperty.SrAl2O4:Dy,Euphosphorswerethereforeheatedat60-90℃inTEOSsoltoformasurfacegelandthenheat-treatedat400℃toobtainSiO2coatedphosphors.ObservationbyTransmissionElectronMicroscope(TEM)andX-rayphotoelectronspectroscopy(XPS)showsthatathinsilicafilmformsonthesurfaceofthephosphors.Thecoatingprocedurecanbeillustratedbyafour-stepprocessandthetransparentsilicafilmcansuppressthehydrolysisprocess,sothattheluminescentpropertiesofthephosphorsareunimpairedorevenbetter.