学科分类
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240 个结果
  • 简介:血浆nitrocarburizing和血浆氧化处理被执行改进wear和SKD61钢的腐蚀抵抗。血浆nitrocarburizing在生产epsilon-Fe2_3的氮,氢和甲烷空气在540°C为12h被进行(N,C)血浆nitrocarburising生产的phase.The混合物层主要由电子阶段组成,与gamma'-Fe4的一个小比例(N,C)复合的层和扩散层的phase.The厚度是大约10亩m和大约200/^m,respectively.Plasma柱子氧化为1h.The500°C的经常的温度与各种各样的氧/氢比率nitrocarburized样品上被执行在在复合的层上的厚度的1-2亩m的很薄的磁铁矿(Fe3O4)层被获得。阳极极化测试表明那个血浆nitrocarburizing过程贡献了SKD61钢的腐蚀抵抗的重要改进。然而,nitrocarburized混合物层的腐蚀特征被氧化处理败坏。

  • 标签: 等离子体 氧化处理技术 防腐措施
  • 简介:血浆合金Zr和血浆nitriding的一个双处理被用来改进Ti-6Al-4V的tribological性质。Zr-N的微观结构合成(alloyed)层Ti-6Al-4V和它的坚硬上形成了,磨擦并且穿性质被使用OM,SEM,GDOES,版本,microhardness测试者以及ball-on-disk摩擦计调查。微结构分析的结果证明alloyed层紧缩、一致并且主要由ZrN,听0.3和AlN组成。很微小的粘合剂和细微氧化穿的A是主要为修改Ti-6Al-4V穿机制。tribological性质双处理以后显著地被改进。防摩的好联合并且穿抵抗因为修改Ti-6Al-4V主要被归因于在表面上形成并且提高了传播Zr层支持的金属氮化物的更高的表面坚硬。

  • 标签: TI-6AL-4V 血浆合金 Zr 血浆 nitriding 磨擦 穿
  • 简介:Surface-graftedpoly(ethyleneglycol)(PEG)moleculesareknowntopreventproteinadsorptiontothesurface.NitinolsampleswerecoatedundertetraglymeECRcoldplasmaconditionstoenhanceitsbiocompatibility.ThemodifiedNitinolsurfaceswerecharacterizedbyhighresolutionESCAandcontactangle,itwasdemonstratedthatthedepositedPEG-likecoatingswerebuiltupmainlyof-CH2-CH2-O-linkagesinsurfaces.ThesurfacewettabilityofthemodifiedNitinolwasincreasedcomparedwiththecontrolsurface.HumanplasmaproteinwasadsorbedonNitinolevaluatedbySEM,theproteinadsorptiononmodifiedsurfacesdecreasedrapidly.Thus,thepotentialbenefitsofcoldplasmatechniquewillbeofusetothebiomedicalindustriesimprovingthebiocompatibilityofmetals.

  • 标签: 表面修饰 NITI 生物材料 乙二醇 冷等离子体 蛋白质吸附
  • 简介:AnewtechniqueofthesynthesisofNanocrystallineDiamond(NCD)Filmsbyheliconwaveplasma(HWP)chemicalvapordepositionatroomtemperaturewasreported.ThegrowthmorphologyandtheroughnessofNCDsampleswascharacterizedusingfiledemissionscanningelectronmicroscopy(SEM-SU8010)andatomforcemicroscopy(AFM),respectively.Theresultsshowthegrowthrateofthefilmwasveryfast,about833nm/min.TypicalG,Dbands

  • 标签: 英语 阅读 理解 纳米材料与技术
  • 简介:AmedicalcastCoCrMoalloywascoatedbyplasmanitridingprocesstoenhancethewearresistance.Themicrostructures,phasesandmicro-hardnessofnitridedlayerswereinvestigatedbyatomicforcemicroscopy(AFM),scanningelectronmicroscopy(SEM),X-raydiffraction(XRD)andmicro-hardness.Tribologicalpropertieswereinvestigatedonapin-on-discweartesterunder25%bovineserumsolutions.Theexperimentalresultsshowedthatplasmanitridingwasapromisingprocesstoproducethick,hardandwearresistantlayersonthesurfaceofCoCrMoalloy.TheharderCrNandCr2Nphasesformedontheplasmanitridedlayerwiththecompactnano-crystallinestructure.Comparedwiththeuntreatedsample,allnitridedsamplesshowedthelowerwearratesandhigherwearresistanceatdifferentappliedloadsandnitridingtemperatures.Itwasconcludedthattheimprovementofwearresistancecouldbeascribedtotheformationofthickerandhardernitridedlayerswiththespecificmicrostructuresonnitridedsurfaces.

  • 标签: 英文摘要 材料科学 优秀论文 科技学报
  • 简介:多层的铱涂层钨上被生产由双发光的碳化物底层血浆过程。作为比较,单层也被生产。微观结构和形态学用扫描电子显微镜学被观察。谷物取向和阶段用X光检查衍射被决定。涂层的剩余压力被学习旁边看一眼的发生X光检查衍射。涂层的粘合剂力量被一个擦伤测试者测量。结果显示出那单层并且多层有一个多晶的阶段与一强壮(110)思考。涂层没有分层的证据有优秀粘附。单层的粘合剂力量并且多层分别地是大约50和43N。底层和层之间的界面的反应发生了,一个新WIr阶段由于高温度的免职过程被发现。单层的剩余压力并且多层分别地是-1.6和-1.1GPa。

  • 标签: 形态学 剩余应力 粘合剂力量 单层 多层
  • 简介:Inordertostudytheatomicoxygencorrosionofspacecraftmaterialsinlowearthorbitenvironment,anatomicoxygensimulatorwasestablished.Inthesimulator,a2.45GHzmicrowavesourcewithmaximumpowerof600WwaslaunchedintothecircularcavitytogenerateECR(electroncyclotronresonance)plasma.TheoxygenionbeammovedontoanegativelybiasedMoplateundertheconditionofsymmetrymagneticmirrorfieldconfine,thenwasneutralizedandreflectedtoformoxygenatombeam.Thepropertiesofplasmadensity,electrontemperature,plasmaspacepotentialandionincidentenergywerecharacterized.TheatomicoxygenbeamfluxwascalibratedbymeasuringthemasslossrateofKaptonduringtheatomic5~30eVandacrosssectionofφ80mmcouldbeobtainedundertheoperatingpressureof10-1~10-3Pa.Suchahighfluxsourcecanprovideacceleratedsimulationtestsofmaterialsandcoatingsforspaceapplications.

  • 标签: 原子氧 ECR等离子体 微波 数值模拟 高通量 LEO
  • 简介:为了认识到钨和CuCrZr合金的有效连接,为血浆面对生产了部件(陆军),爆炸焊接为它的一些被采用唯一的优点。不同焊接特征在这研究被调查。周期性地改变从的焊接盘子的界面的波形对一个大波浪并且最后扁平小浪指向一个稳定的波浪,它以爆炸开始了。标本的结合的力量比32.9MPa高。焊接变硬并且microcracks的形成发生在接口地区。结果证明加入的可靠性需要被改善以便满足包含制作基于钨的陆军的爆炸焊接的使用的应用的需要。

  • 标签: 爆炸焊接 爆炸复合板 粘接界面 等离子体 部件 铬锆铜
  • 简介:铝做了锌氧化物(偶氮)薄电影被DC磁控管低底层温度劈啪作响准备。同轴的螺线管卷被放在磁控管目标附近提高血浆密度(Ji)。提高的血浆密度显著地改进了体积抵抗力()并且它在偶氮的电影的空间分发的同质。X光检查衍射(XRD)分析表明增加的Ji影响了crystallinity,压力松驰和另外的材料性质。偶氮的电影模式显示出的低血浆密度(LPD)扔了显著变化(从6.5ate温度固体氧化物燃料房间(SOFC),哪个可能在500600点被操作?慀牲慥獲眠吗?

  • 标签: 等离子体密度 直流磁控溅射 氧化物薄膜 性能增强 铝掺杂 氧化锌
  • 简介:包含Pechini方法和火花血浆sintering(SPS)方法的一条典型途径为高密度Li5+xSrxLa3xBi2O12的准备被介绍(x=0,1)陶艺。阶段形成,微观结构,谷物尺寸和标本的电的性质用XRD,SEM和交流电阻抗光谱学(酸)被检验。有纯像石榴石的阶段,97%的相对密度和大约5m的平均谷物尺寸的稠密的Li5La3Bi2O12和Li6SrLa2Bi2O12陶艺用这条途径被制作。在陶艺由SPS方法准备了的Li5La3Bi2O12和Li6SrLa2Bi2O12的298K的全部的传导性是5.1吗??

  • 标签: 放电等离子烧结法 电气性能 石榴石 锂离子导体 制造 Pechini法
  • 简介:TheeffectoftitaniumadditiononthemicrostructureandmechanicalpropertiesofbrassCu40Znhasbeenstudiedviathepowdermetallurgy(P/M)route.Thewater-atomizedCu40Zn—1.0wt%Tialloypowderwasconsolidatedatdifferenttemperaturesintherangeof400—600℃usingsparkplasmasintering(SPS)andhotextrusionsubsequently.Resultsshowthatthesuper-saturatedsolidsolutiontitaniumelementinrapidlycooledbrassCu40Znpowdercreatedhighchemicalpotentialforaprecipitatereaction,showingsignificantgrainrefinementeffectsontheconsolidatedCu40Znmatrix.Consequently,excellentmechanicalpropertieswereobtainedbyprecipitationhardeningandworkhardeningaftersinteringandextrusion,withyieldstrengthof390MPa,ultimatetensilestrengthof617MPa,andVickersmicro-hardnessof192HV,whichare28.7%,23.4%,and23.9%highervaluesthanthoseofextrudedCu40Znbrass,respectively.

  • 标签: 放电等离子烧结 黄铜合金 微观结构 力学性能 热挤压 析出行为
  • 简介:Layeredcathodematerialsofhigh-temperaturelithiumbatteries,LiNi1/3Mn1/3Co1/3O2aresynthesizedbyasol-gelmethodwithvariationinfinalsinteringtemperatureforboreholeapplications.Thestructure,morphologyandhigh-temperaturedischargeperformanceoftheseresultingproductsareinvestigatedbyX-RayDiffraction(XRD),scanningelectronmicroscopy(SEM),laserparticlesizeanalysis,galvanostaticandpulsedischarge.Theresultsofstructuralanalysisindicatethatthesamplesinteredat800℃hasthecharacteristicsofgoodcrystallinity,narrowsizedistributionandlargespecificsurfaceareaatthesametime.Thedischargeexperimentsalsoindicatethatthissamplehasthebestelectrochemicalproperties,withthemaximumdischargecapacitiesof314.57and434.14mAh·g-1at200and300℃respectivelyandtheminimumcellinternalresistancesatbothtemperatures.

  • 标签: SINTERING TEMPERATURE ELECTROCHEMICAL properties Li Ni1/3Mn1/3Co1/3O2
  • 简介:Anovelfluorescentprobe9-(4-(1,2-diamine)benzene-N1-phenyl)acridine(DABPA)wassynthesizedforthedetectionofnitricoxide(NO)andcharacterizedbyIR,1H-NMRandEI-MSspectroscopy.Basedonaphotoelectrontransfermechanism,thefluorescenceintensitiesofDABPAwereinvestigatedwiththedifferentconcentrationsofNO.Undertheoptimalexperimentalconditions,thefluorescenceintensityofDABPAhadagoodlinearrelationship(R2=0.9977)withNOconcentrationintherangefrom1×10-7to1.5×10-6mol/Lwithadetectionlimitof1×10-8mol/L.ThecytotoxicityinducedbyDABPAwasevaluatedbytheMTT(3-(4,5-dimethylthiazol-2-yl)-2,5diphenyltetrazoliumbromide)assayforbiologicalapplication.Furthermore,theprobeDABPAhadalsobeensuccessfullyappliedtoreal-timeimageNOproducedinPC12cellsinthepresenceofL-arginine.

  • 标签: 荧光探针 一氧化氮 苯基 二胺 氮测定 最佳实验条件