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10 个结果
  • 简介:NanostructuredtitaniahavebeenintensivelyinvestigatedasanodematerialsofLi-ionbatteriesfortheirexcellenthighrateperformance.ThesizeeffectsofTiO2polymorphs(mainlyrutile,anataseandTiO2-B)ontheirelectrochemicalperformanceandthelatesteffortsinnanoengineeringtitaniaanodesthroughenhancingtheirionicorelectronictransportationorbotharereviewedinthiswork.Wesupposethatmicron-orsubmicronsizedporousstructuresassembledbyTiO2nanoparticles,nanowires/nanotubesornanosheetswithahighpercentageofexposinghighreactivefacetstogetherwithaconductivepercolatingnetworkareidealanodesnotonlyforhighratelithiumstoragebutalsoforhighpackingdensitiesoftheactivematerials.

  • 标签: 纳米二氧化钛 锂离子电池 高倍率 工程学 电化学性能 纳米TIO2
  • 简介:水和率和在早阶段的水泥的力量上的苍蝇灰和硅石烟的效果被学习。对比测试被用于复杂似水泥的系统调查水和率。在复杂文件夹的水和过程期间与机械力量,苍蝇灰的影响和硅石烟结合了被研究。当然而,当硅石烟的比率增加了,苍蝇灰的比率增加了,水和热进化和机械力量的率的山峰减少了,水和热进化和机械力量的率的山峰显然增加了。当苍蝇灰和硅石烟的比率是10%和5%时,水和热进化的率的山峰最高。同时7天曲折、压缩的力量分别地作为8.89MPa和46.52MPa最高。苍蝇灰和硅石烟是影响水和率和机械性质的主要因素。

  • 标签: 水化速度 水泥浆体 粉煤灰 硅粉 迫击炮 复合胶凝材料
  • 简介:磨擦促使处理(FSP),FSW的一个变化(磨擦促使焊接)能局部地消除的一种新兴的表面工程技术正在扔缺点和精制微观结构,从而改进material.FSP的机械性质能也通过厚度生产有细密纹理的微观结构给予技术包含跳入很快旋转的superplasticity.The,非可消费的工具,包括一根介绍大头针和更大的直径肩膀,进表面然后越过表面穿越工具。大头针和肩膀磨擦加热在从而改进机械性质的处理区域改变谷物结构的表面。这篇论文在微观结构和渗出的演员组的机械性质上论述FSP的效果2285铝合金在三不同喂率viz.10,12和15mm/min.Withfeed速度的增加材料被观察增加了也增加的impactstrength.FSP张力并且有坚硬和韧性价值的增加的收益力量另外。观察详细被列出了并且图片地代表了。

  • 标签: 显微结构 摩擦加工 机械力学 铝合金
  • 简介:Themajorobjectiveofthisresearchwastodiscusstheeffectsofloadingrateontheflexural-tensionpropertiesanduniaxialcompressivestrengthofmicro-surfacingmixtureusingthree-pointbendingtestanduniaxialcompressivetestrespectively.Asapreventivemaintenancesurfacetreatmentonasphaltpavement,micro-surfacingwasformedonthebasisoftheISSArecommendationofanoptimummicro-surfacingdesign.Testswereconductedoverawiderangeoftemperaturetoinvestigatethedifferenceofpropertiesfromlowloadingratetoarelativelyhighloadingrate.Three-pointbendingtestwasusedtostudytheflexuralstrength,strainandmodulusofmicro-surfacingmixture,anduniaxialcompressivetestwascarriedouttoobtaintherelationshipbetweenstrengthandtheloadingrateaswellastemperature.Theexperimentalresultsshowedthatflexuralstrengthathighloadingratewaslargerthanthatatlowloadingrate.Theflexuralstrengthdifferencebetweenlowandhighloadingrateenlargedwhenthetemperaturerose.Theflexuralstrainathighloadingrateincreasedcomparedwithresultsofthelowloadingrate.Resultsoftheflexuralmodulusrevealedthatmicro-surfacingmixtureexhibitedbetteranti-crackingcharacteristicatlowtemperaturewhengivenarelativelylowloadingrate.Resultsofuniaxialcompressivetestrevealedthatthestrengthdifferenceofmicro-surfacingamongdifferentloadingratesincreasedwiththeincreaseoftemperature.Thelogarithmrelationshipbetweenthestrengthandloadingrateoverawiderangeoftemperaturewasobtainedtocomparetheexperimentalandpredictedvalues,whichresultinginareasonableconsistency.

  • 标签: 三点弯曲试验 单轴抗压强度 拉伸性能 加载速率 微表处 混合料
  • 简介:有双阶段的结构(alpha+beta)的alpha钛和它的合金在大约10~的紧张率下面动态地被使变形4s~(-1)。形成和微结构进化局部性砍乐队们被扫描电子显微镜学(SEM)和传播电子显微镜学(TEM)描绘。结果表明紧张和紧张率应该同时被看作机械条件为砍乐队形成,和twinning是变丑的一个重要模式。试验性并且在乐队以内的材料经历了的计算表演超高频率的紧张率(9X10~5s~(-1))变丑,它是平均紧张率的二大小要求了为砍乐队形成;在乐队的脱臼能被压缩并且发展成房间结构;到在乐队以内的alpha_2的阶段转变fromalpha被观察,并且转变产品(alpha_2)与他们的父母一起有某个结晶的取向关系;有在在乐队以内观察的直径的10亩m的一种平均尺寸的equiaxed谷物被建议是再结晶的结果。

  • 标签: 钛合金 剪切带 微观结构 结构变形 相变
  • 简介:Newvisibletransparent,UVabsorption,andhighinfraredreflectionpropertieshavebeenrealizedbydepositingmultilayerSiO2/ZnO:Al/CeO2-TiO2/SiO2filmsontoglasssubstratesatlowtemperaturebyradiofrequencymagnetronsputtering.OptimumthicknessofSiO2,ZnO:Al(ZAO)andCeO2-TiO2(CTO)filmsweredesignedwiththeaidofthinfilmdesignsoftware.Thedegreeofantireflectioncanbecontrolledbyadjustingthethicknessandrefractiveindex.TheouterSiO2filmcandiminishtheinterferencecoloringandincreasethetransparency;theinnerSiO2filmimprovestheadhesionofthecoatingontheglasssubstrateandpreventsCa2+,Na+intheglasssubstratefromenteringtheZAOfilm.Theaveragetransmittanceinthevisiblelightrangeincreasesbynearly18%-20%,ascomparedtodoublelayerZAO/CTOfilms.Andthefilmsdisplayhighinfraredreflectionrateofabove75%inthewavelengthrangeof10-25μmandgoodUVabsorption(〉98%)properties.Thesesystemsareeasytoproduceonalargescaleatlowcostandexhibithighmechanicalandchemicaldurability.ThetriplefunctionalfilmswithhighUVabsorption,antireflectiveandhighinfraredreflectionratewilladapttoapplicationinflatpaneldisplayandarchitecturalcoatingglass,automotiveglass,withdiminishinglightpollutionaswellasdecreasingeyefatigueandincreasingcomfort.

  • 标签: SI O2/Zn O:Al /Ce O2-Ti O2/Si