简介:EffectofCe-Mg-Si(lightRE)andY-Mg-Si(heavyRE)nodulizersonthemicrostructuresandmechanicalpropertiesofheavysectionductileironwasinvestigatedtodevelopthematerialofspent-nuclear-fuelcontainers.Twoas-castsweretreatedbythesamequalitypercentageoflightREandheavyRE,respectively.Fourpositionswerechosentostandfordifferentsolidificationcoolingratesofspecimens.Thetensilestrength,elongationandimpacttoughnessofspecimenstreatedbyheavyREwereallhigherthanthoseofthespecimenstreatedbylightRE.Withthedecreaseofcoolingrate,themechanicalpropertiesoftwospecimensdecreased,andthefracturemorphologychangedfromductilefracturetobrittlefracture.TheimprovingeffectofmechanicalpropertiesbetweenheavyREandlightREwasobviousduetothebetteranti-degradationpropertyofheavyRE.Whilethesolidificationprocesslastedformorethan250min,theimprovingeffectwasnotobviousduetoseriousspheroidalizationdecaying.
简介:水晶的Au5Si2/Si异质接面nanowires(Au5Si2/SiNWs)被热蒸发的SiO粉末在一个低真空系统在厚黄金涂的硅底层上获得。生产Au5Si2/Si异质接面的结构分析被采用一台传播电子显微镜(TEM)和一个选择区域执行电的衍射计。化学作文被纳入TEM的一个精力散的X光分光镜学习。一个二拍子的圆舞生长模型被建议描述Au5Si2/SiNWs的形成。在第一步期间,水晶的SiNWs经由在相对高的温度把帮助氧化物的生长过程与vapour-liquid-solid模型相结合的生长机制被形成。在第二步,preformedSiNWs的温度减少和减少片断与残余Au反应由一个solid-liquid-solid过程形成单个水晶的Au5Si2nanowires。现在的工作应该基于nanowires为未来合成和高质量的金silicidenanowires和微电子设备的研究是有用的。
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简介:ForthecomingsuperheavytestexperimentatRIBLL,wedevelopedaSi-arrayderector(showninFig.1)andhavetesteditwitha3-componentαsource.Thisdetectorconsistsofoneposition-sensitiveSi-detector(PSD),fourlarge-areaSiphoto-diodedetectors(SPD)andeightsmall-areaSiphoto-diodedetectors,theirsensitive
简介:Theeffectofhydrogenpassivationonmulticrystallinesilicon(mc-Si)usedforsolarcellsisdescribed,andthemechanismofhydrogendiffusionandpassivationisalsoinvestigated.Then,thehydrogenpassivationprocessesappliedinindustriesandresearchlaboratoriesareintroduced.Finallytheexistingproblemsandtheprospectsofhydrogenpassivationarereviewed.
简介:InfluenceofImpurityGermaniumonPropertyofCZ-SiZhangWeilian;LiuCaichi;WangZhijunandJiZhijiang(张维连)(刘彩池)(王志军)(冀志江)(MaterialResea...
简介:ATi/Sicomplexzeolitehasbeenprepared.X-raydiffractionandinfraredspectrometrystudyhasshownthattwostructures,namelytheZSM-5andMCM-41,existinthesample.BETtestshaverevealedthatthecomplexzeolitecontainsregularmesoporesof2.6nm.UltravioletspectrometryanalysishasshownthattheTispeciesexistinthezeoliteskeletonintheformoftetra-coordinatevalence.TheTi/Sicomplexzeolite(TS-1/Ti-MCM-41)hasapparentlyimprovedcatalyticactivitywithrespecttothemacromolecularorganiccompoundoxidationascomparedtoindividualcomponentsofeitherTiorSicontainingzeolites(TS-1andTi-MCM-41).