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  • 简介:InordertocontrolthesizeanddistributionofthehighconductiveFe2PinLiFePO4/Fe2Pcomposite,twodifferentcoolingrates(Fast:15℃·min-1,Slow:2℃·min-1)wereemployedaftermechanicalalloying.Thedischargecapacityofthefastcooledwas83mAh·g-1andtheslowcooled121mAh·g-1.TheparticlesizeofthesynthesizedpowderwasexaminedbytransmissionelectronmicroscopyanddistributionofFe2Pwascharacterizedusingscanningelectronmicroscopy(SEM).Inaddition,two-stepheattreatmentwascarriedoutforbetterdistributionofFe2P.X-raydiffraction(XRD)andRietveldrefinementrevealthatLiFePO4/Fe2Pcompositeconsistsof95.77%LiFePO4and4.33%ofFe2P.

  • 标签: LiFePO4/Fe2P COMPOSITE mechanical ALLOYING HEAT treatment
  • 简介:1IntroductionTherareearthcobaltalloyshavethepotentialformakingthemagneticandmagnetoopticalmaterials.Sofar,therareearthcobaltalloyfilmsaresubstantiallyproducedbysputteringorvacuumplating.Ifsuchfilmsarepreparedbyelectrodepositioninstead,productionefficiencywouldbeimprovedandthecompositionofthealloycouldbecontrolled.Becausetheoxidationreductionpotentialsofrareearthelementsareverynegative,organicsolventsmaybeusedaselectrolyticmedia.ElectrodepositionofGdCoandSmCoinorganicsolutionshasbeenreporte...

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  • 简介:新华网杭州9月11日电,新华社记者周炜、何玲玲报道,杭州海关下属温州海关查获22个40英尺集装箱“电子洋垃圾”405.5吨。目前海关已对这批发自美国的“洋垃圾”严加监控。据了解,今年以来陆续进入温州口岸的这些“电子洋垃圾”,均系从美国发货经上海转关进境,进口舱单上显示为“电子产品”。但有

  • 标签: 电子垃圾 海关 进口舱单 40英尺集装箱 9月11日 新华网
  • 简介:FractureCharacteristicsofSiC()/AlCompositesGuHongwei;CaoLi;YuanGuansen;LiuAnsheng;WuZiqinandChenLanfeng(古宏伟),(曹利),(袁冠森),(刘安生...

  • 标签: SIC AL COMPOSITE
  • 简介:[1]A.G.Khachaturyan,T.F.Lindsey,J.W.Morris,Jr:Metall.Trans.,19(1988),p.249.[2]V.Radmilovic,A.G.Fox,G.Thomas:ActaMetall.,37(1989),p.2385.[3]B.J.Shaiu,H.T.Li,HaydnChen:Metal.Trans.,21(1990),p.1133.[4]G.Schmitz,P.Haasen:ActaMetall.Mater.,40(1992),p.2209.[5]V.Mahadev,K.Mahalingam,G.L.Liedl,etal.:ActaMetall.Mater.,42(1994),p.1039.[6]P.Haasen:PhaseTransformationsinMaterials.VCH,Weinheim,1991.[7]L.Q.Chen,A.G.Khachaturyan:ActaMetall.Mater.,39(1991),p.2533.[8]L.Q.Chen,A.G.Khachaturyan:ScriptaMetall.,25(1991),p.67.[9]R.Poduri,L.Q.Chen:ActaMetall.Mater.,44(1996),p.4253.[10]A.Chakrabarti:Phys.Rev.,45(1992),p.9620.[11]H.Tanaka,TakeshiYokokawa,HajimeAbe,etal.:Phys.Rev.Lett.,65(1990),p.3136.

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  • 简介:ThemixturemodelofAl85Y4Nd4Ni7alloyinwhichapartiallycrystallizedamorphousalloyisregardedasananocompositeofanAlnanoparticleandaremainingamorphousmatrixispresented.Itsevolutionintheprocessofcrystallizationhasbeeninvestigatedbydifferentialscanningcalorimetry(DSC),X-raydiffraction(XRD),andtransmissionelectronmicroscopy(TEM).Mainlyamorphousstructurewithα-Alnanocrystalsembeddedintheamorphousmatrixhasbeenrevealedbymeltspiningthealloy.Crystallizationisshowedtooccurinthreestages:(1)crystallizationofamorphousalloyandformationofAlNiY,AlNdNiandunknowncrystallinephases,(2)formationofAl3YandAl3Nd,and(3)formationofAl3Ni.

  • 标签: 无定形合金 Al85Y4Nd4Ni7合金 结晶化行为 微观结构
  • 简介:本文从无由化阻燃的机理出发,分析了常用的材料的特性,提供了常用的参考配方。还罗列了基材厂家的一些这类产品的特性。

  • 标签: 阻燃机理 DOPO 苯并噁嗪
  • 简介:ToinvestigatethedegradationofcorrosionresistanceofZircaloy-4inLiOHaqueoussolution,SIMS(secondaryionmassspectrometry)analysiswasperformedtoexaminetheprofilesofLi+,K+,andOH-inoxidelayersformedinthesameconcentration(0.1mol/L)LiOHandKOHsolutions.Eventhoughtheoxidelayershaveanequalthickness,thepenetrationdepthofK+isshallowerthanthatofLi+,andthepenetrationdepthofOH-corrodedinKOHsolutionisalsoshallowerthanthatcorrodedinLiOHsolution.ItshowsthatthediffusionofOH-intooxidelayerisaccompaniedbythecorrespondingcation.ThedifferenceofdegradationeffectofLiOHandKOHsolutionsonthecorrosionresistanceofZircaloy-4wasdiscussed.

  • 标签: 锆合金 氢氧化锂水溶液 耐腐蚀性 二次离子质谱
  • 简介:本文通过对随机购入的国产模具钢P20钢样的各种加工性能试验,阐述了国产P20模具钢在模具加工中的应用状况。

  • 标签: 国产模具钢 P20 加工性能
  • 简介:2005年4月20日,PTC宣布,领先的模具制造商龙记集团选用了Pro/ENGINEER的“模具设计专家”(ExpertMoldbaseExtension,EMX),旨在建立模具制造业内最完善的模具库。

  • 标签: PRO/ENGINEER 选用 集团 EXTENSION 3D 2005年
  • 简介:通过裂纹和断口的观察、理化检验、模拟仿真及其力学计算,分析了840D车轮辐板孔裂纹的特征、机理和原因。结果表明:裂纹属于高低周复合机械疲劳,裂纹主要在制动加机械载荷工况下萌生和扩展。统计分析确定了裂纹扩展速率,结合裂纹发展形态和理论计算给出了临界裂纹长度,进而评估出裂纹容限为20mm。

  • 标签: 车轮 疲劳失效 裂纹容限
  • 简介:苏丹1/2/4油田年产原油1000万吨。油田内部集输管线600余km,集输干线100km,连接5个现场处理系统(FPF)和中心处理站(CPF)。优质原油经1500多公里的长输管道到达苏丹港出口。油田设施的设计寿命为25年。较为完善的防腐蚀系统设计覆盖了从井下套管、集输管线、输油干线到采油厂设备的几乎所有设施。本文对油田的防腐蚀系统的全貌进行介绍。

  • 标签: 苏丹 1/2/4油田 防腐措施 评价 腐蚀预测 阴极保护
  • 简介:TheelectrochemicalbehaviorofCu-Zn-Alshapememoryalloy(SMA)withandwithoutelectrolessplatedNi-PwasinvestigatedbyelectrochemicalmethodsinartificialTyrode'ssolution.TheresultsshowedthatCu-Zn-AlSMAengendereddezincificationcorrosioninTyrode'ssolution.TheanodicactivecurrentdensitiesaswellaselectrochemicaldissolutionsensitivityoftheelectrolessplatedNi-PCu-Zn-AlSMAincreasedwithNaClconcentrationrising,pHofsolutiondecreasingandenvironmentaltemperatureuprising.X-raydiffractionanalysisindicatedthataftersurfacemodificationbyelectrolessplatedNi-P,anamorphousplatedfilmformedonthesurfaceofCu-Zn-AlSMA.ThisfilmcaneffectivelyisolatematrixmetalfromcorrosionmediaandsignificantlyimprovetheelectrochemicalpropertyofCu-Zn-AlSMAinartificialTyrode'ssolution.

  • 标签: 电化学行为 CU-ZN-AL 形状记忆合金 无电镀Ni-P