简介:ToreducetheproductioncostofBi-2223superconductingtapes,Bi-2223/Ag/Nitapeswerefabricatedbythepowder-in-tubeprocess.TheeffectofheattreatmentonthemicrostructureandcriticalcurrentoftheBi-2223/Ag/Nitapeswerestudied.ThephasecompositionsofthesampleswerecharacterizedusingXRD.ThemicrostructurewasobservedusingSEM.ExperimentalresultsindicatethathighertemperatureismoreconducivetotheformationofBi-2223phaseatanatmosphereof8.5%O2.Afterthetwo-steph...
简介:Pt(Ⅱ)andPd(Ⅱ)complexeswith2',3',4',5,7-pentahydroxy-flavoneweresynthesizedandcharacterizedbyelementalanalysis,molarconductance,IR,1HNMR,TG-DTA,UV-Visspectroscopictechniques,andfluorescenceanalysis.Thescavengingeffectonthesuperoxideradical(O-2)andtheinhibitoryeffectonlipidperoxideswerealsoinvestigated.Boththeligandandthecomplexesexhibitscavengingeffectonsuperoxideradicals,andtheeffectofthecomplexesisgreaterthanthatoftheligand.ThePt(Ⅱ)complexexhibitsthestrongestscavengingefficiency.BothPt(Ⅱ)andPd(Ⅱ)complexeshavetheinhibitoryeffectonlipidperoxides,andtheeffectofthecomplexesisgreaterthanthatoftheligand,butthePt(Ⅱ)complexhasahigheffectofpromotinglipidperoxides.
简介:ThecyclicvoltammetryandpotentiostaticelectrolysiswereusedtoinvestigatethepreparingofDy-BialloyfilmsinLiCl-DMSO(dimethylsulfoxide)system.Theeffectsofseveralfactorsincludingthepotentialofdeposition,concentrationsofmainsalts,andtheconcentrationratioofDyCl3toBi(NO3)3werestudied.Dy-Bialloyfilmscontaining4.82%-80.62%(massfraction)dysprosiumwerepreparedinDyCl3-Bi(NO3)3-LiCl-DMSOsystembycontrollingthesystemcompositionanddepositionconditions.Thefilmsaregray,uniform,metalliclusterandadherefirmlytothecoppersubstratesanalyzedbySEM(scanningelectronmicroscope),EDS(X-rayenergydispersiveanalysis),andXRD(X-raydiffraction).Afterheattreatmentat718Kforlh,thealloyphaseofDy-BiwasfoundinXRDpatterns.
简介:为实现飞机碳纤维复合材料(CarbonFiberReinforcedPlastics,CFRP)层板在役检测,采用同侧空气耦合超声兰姆波特征成像检测的方法对其缺陷进行检测。将非接触空气耦合超声传感器置于CFRP层板同侧,激发A0模态兰姆波,对其冲击损伤进行D扫描检测。引入时间反转损伤指数表征复合材料层板的冲击损伤。结合概率损伤算法,以该指数作为损伤重构成像的特征值,将不同扫描路径上的特征值数据进行融合,得到CFRP层板冲击损伤缺陷的兰姆波图像。结果表明,基于时间反转的兰姆波图像不仅能够直观地呈现损伤缺陷的位置和形状,而且能够通过避免基准信号选取和减少扫描步进次数显著提高检测效率。
简介:研究Sb元素含量对Sn-Bi系焊料性能的影响。通过差示扫描量热法研究Sn-Bi-Sb焊料的熔化行为。采用铺展实验研究焊料在Cu基板上的润湿性。测试Sn-Bi-Sb/Cu结合界面的力学性能。结果表明:三元合金中含有包共晶反应形成的共晶组织,随着Sb含量的增加,共晶组织增多;在加热速率为5℃/min的条件下,三元合金显示出更高的熔点和更宽的熔程;添加少量Sb对Sb-Bi系焊料的铺展率有影响;在焊料铺展过程中形成反应过渡层,反应过渡层中存在Sb元素而无Bi元素,过渡层厚度随着Sb元素含量的增加而增大。Sn-Bi-Sb焊料的剪切强度随着Sb元素含量的增加而升高。
简介:采用丝印法在铝基板上制备具有低室温电阻率、适中热敏常数的负温度系数BaCo0.02ⅡCo0.04ⅢBi0.94O3/Ba0.5Bi0.5Fe0.9Sn0.1O3复合热敏厚膜。采用数字多用表、吉时利2400和阻抗分析仪对热敏厚膜的电学性能进行表征。结果表明:随着Ba0.5Bi0.5Fe0.9Sn0.1O3含量从0.05增加至0.25,厚膜的室温电阻率、热敏常数和峰值电压均有所增加且分别处于1.47-26.5Ω·cm、678-1345K和18.9-47.0V范围内,厚膜峰值电压对应的电流也有所降低且处于40-240mA范围。阻抗谱测试表明,这些热敏厚膜表现出非正常的异质电学微结构行为,由高阻态的晶粒和较低电阻态的晶界区域构成。由此可知,在BaCo0.02ⅡCo0.04ⅢBi0.94O3中添加Ba0.5Bi0.5Fe0.9Sn0.1O3改善了热敏行为但也恶化了电流特征.
简介:Thermoelectric(TE)materialsareakindoffunctionalmaterialswhichcanbeusedtoconvertdirectlyheatenergytoelectricityorreversely.Thethermoelectriceffectsholdgreatpotentialforapplicationinpowergenerationandrefrigeration.Bi2Te3anditsalloysarewellknownasbestTEmaterialscurrentlyavailablenearroomtemperature.Thispaperstudiesrespectivelytheeffectsofsparkplasmasintering(SPS)onelectricperformanceofBi0.5Sb1.5Te3thermoelectricmaterialsthatarepreparedthroughvacuummeltingandballmilling.ThroughX-rayDiffractionandcoldfieldemissionscanningelectricmicroscopes4800,thephaseconstituentandmicrostructureoftheTEmaterialssampleswereanalyzed.ElectricconductivityandpowerfactorcanbeimprovedwiththeriseofSparkPlasmaSinteringtemperature(from300to500℃)andpressure(from30to60MPa),andthedensityandmechanicalstrengthofBi0.5Sb1.5Te3thermoelectricmaterialincrease,too.
简介:Basedonthephasediagrams,measuredactivitiesandtheannexationprinciple,thecalculatingmodelsofmassactionconcentrationsforIn-Pb-AgandIn-Bi-Sbternarymetallicmeltshavebeenformulated.Theresultsofcalculationbothagreewithpractice,andobeythelawofmassaction,showingthatthemodelsformulatedcanreflectthestructuralrealityofthecorrespondingmeltsandtheannexationprincipleisapplicabletothethem.
简介:TheprocesstoobtainhighT(110K)phasequickly,themicrostructureandpropertiesofAg-sheathedBi(Pb)-Sr-Ca-Cu-Osuperconductortapeshavebeenstudied.ItwasfoundthattheformationtimeofthehighTcphasewasgreatlyshortenedbytheadditionofmoreCaandCutothenominalcompositionofBi(Pb):Sr:Ca:Cu=2:2:2:3andtheadoptionofappropriatesinteringtemperatureandcoolingrate.SuperconductorpowderwithpredominanthighT,phasewaspreparedaftera840C/50htreatment.TheJoftheAg-sheathedtapesandthemagneticfielddependenceofJwereobviouslyimprovedbyrepeatedlypres-singandsintering.Themaximumtransportcurrentdensityat77Kinazeromagneticfieldwas12,200A/cm2.ThemagneticdependenceofJwassummarizedasfollows:6.450A/cm2(B⊥1.B∥S.0.1T)1,810A/cm2(B⊥1.B∥S,1T),390A/cm2(B⊥1.B∥S,2T)(B:magneticfield.1:electriccurrent.S:surfaceoftapes).TheimprovementofJwasattributedtotheformationoftheplate-likestructurewithhomogeneouscompositiondistributionandthestrongc-axistexture.
简介:激光粉末免职被使用制作Ti-6.5Al-3.5Mo-1.5Zr-0.3Si(wt%)/Ti-47Al-2Cr-2Nb-0.2W-0.15B(at%)双性人材料系统。当同样扔的-TiAl合金由组成时,同样扔的TC11合金显示出basket-wave-like形态学充分2/薄片状的微观结构。在处理期间考虑在TC11和-TiAl之间的热失配,接口微观结构进化被担心。转变小径被说明。艾尔元素和-stabilizers瞬间,Cr,和Nb的内容变化为在接口的微观结构的进化负责,这被发现。破裂表面在-TiAl方面被定位。双性人材料显示出一种易碎破裂的方式,与560的最终的张力的力量?MPa。
简介:ThemixturemodelofAl85Y4Nd4Ni7alloyinwhichapartiallycrystallizedamorphousalloyisregardedasananocompositeofanAlnanoparticleandaremainingamorphousmatrixispresented.Itsevolutionintheprocessofcrystallizationhasbeeninvestigatedbydifferentialscanningcalorimetry(DSC),X-raydiffraction(XRD),andtransmissionelectronmicroscopy(TEM).Mainlyamorphousstructurewithα-Alnanocrystalsembeddedintheamorphousmatrixhasbeenrevealedbymeltspiningthealloy.Crystallizationisshowedtooccurinthreestages:(1)crystallizationofamorphousalloyandformationofAlNiY,AlNdNiandunknowncrystallinephases,(2)formationofAl3YandAl3Nd,and(3)formationofAl3Ni.
简介:由于压力和腐蚀等原因,承压设备的大焊缝根部易出现底面开口裂纹。本研究采用超声相挖阵扇扫检测技术对底面开口裂纹进行检测。基于底面开口裂纹上下尖端回波,提出采用绝对到达时间技术(AbsoluteArrivalTimeTechnique,AATr)测量其高度。制作含有不同高度的人工裂纹试块,通过模拟仿真和实验测量验证AATF法测量底面开口裂纹高度精度。实验结果表明超声相控阵AATT法能从单面单侧对缺陷进行检测测量,当裂纹高度大于3mm时,能达到与常规TOFD相同的测量精度。同时研究了声柬偏转角度对AATF测量结果的影响,结果表明基于裂纹尖端衍射波的AATT具有更高的测量精度。