简介:Thecombinedquadraticorthogonalregressionmethodofexperimentdesignwasemployedtoexploretheeffectsofprocessparametersofplasmanitridingoftantalumsuchastotalpressure,temperatureandoriginalhydrogenmolarfractiononthehardness,roughnessandstructureofnitridingsurfaces.Theregressionequationsofhardness,roughnessandstructureweregivenaccordingtotheresultsofregressionandstatisticanalysis.Andthediffusionactivationenergyofnitrogenintantalumonplasmanitridingconditionswascalculatedaccordingtotheexperimentaldataofhardnessofplasma-nitridingoftantalumvstimeandtemperature.Thediffusionactivationenergycalculatedbelongsto(155.49+10.51)kJ/mol(783-983K).
简介:Thenon-isothermalleachingkineticsofprimarytitanium-richmaterialbymicrowaveheatingwasinvestigated,andthetemperature-pressurecurvesofleachingsystemandmicrowaveabsorptioncharacteristicsofmixturesolutionsbeforeandafterleachingweremeasured.Theresearchofnon-isothermalkineticswasevaluatedbytheleachingrateofFeandthetotalapparentvelocityequationofthenon-isothermalkineticsofleachingforprimarytitanium-richmaterialbymicrowaveheatingwasobtained.Itisshownfromthetemperature-pressurecurvesthatthehightemperatureandhighpressureofclosedleachingsystemarefavorabletotheenhancementoftheleachingrateofFe.Microwaveabsorptioncharacteristicsofmixturesolutionsbeforeandafterleachingshowthatthereareabruptchangesofmicrowaveabsorptioncharacteristicsfor15%HClsolutionandthemixturesolutionafterleachingby20%HCl.
简介:二酸矿排水(AMD)样品TS和WK,从在Guangxi省的Dachang充满金属的矿,中国,用基于PCR的克隆被学习途径。44个运作的分类单位(OTU)的一个总数从二件AMD样品被获得。然而,仅仅三OTU(GXDC-9,GXDC-19和GXDC-50)在样品TS检测了能也在样品WK被观察。种系发生的分析表明在二件样品的细菌掉进四个通常认为的部门,它是Nitrospira,Alphaproteobacteria,Gamaproteobacteria,和Acidobacteria。类Acidithiobacillus和Leptospirillum的有机体,在gamaproteobacteria班和Nitrospira家庭上,分别地在二件样品是主导的。在样品TS,它被低pH描绘,高硫酸盐,高铁,和高砷化物,二种(Acidithiobacillusferrooxidans和Leptospirillumferrooxidans)组成了98.22%全部微生物引起的社区。与样品TS相比,在样品WK的微生物引起的社区根据观察是更多样化的。抱持兴趣地,Legionella种类,很少在low-pH环境被观察,在样品WK被检测。这个工作帮助我们进一步理解微生物引起的社区与唯一的地球化学和acidophiles的忍耐能力在极端酸矿排水住在一起到重金属的差异。
简介:MechanicallyactivatedW-Cupowdersweresinteredbyasparkplasmasinteringsystem(SPS)inordertodevelopanewprocessandimprovethepropertiesofthealloy.Propertiessuchasdensityandhardnessweremeasured.ThemicrostructuresofthesinteredW-CualloysampleswereobservedbySEM(scanningelectronmicroscope).Theresultsshowthatsparkplasmasinteringcanobviouslylowerthesinteringtemperatureandincreasethedensityofthealloy.Thisprocesscanalsoimprovethehardnessofthealloy.SPSisaneffectivemethodtoobtainW-Cupowderswithhighdensityandsuperiorphysicalproperties.
简介:有五个分支的像花瓣的icosahedralquasicrystal,被认为是icosahedralquasicrystal的代表性的形态学,在Y富有的Mg-Zn-Y第三的合金被观察了。而且,像多角形的形态学,icosahedralquasicrystal的另一个模式,也在Y富有的Mg-Zn-Y第三的合金被发现了。后者形态学源于以前的进化。icosahedralquasicrystal的像花瓣的形态学的生长机制也被讨论。Alloying作文,即,Y元素内容,是导致icosahedralquasicrystal的形态学进化的一个主要因素。
简介:ThepurposeofthisstudywastoinvestigatetheeffectsofZrinterlayeronthestructureandmechanicalpropertiesofTiAlNfilms,whichweredepositedontheM2high-speedsteelsubstratesbymeansofplasma-enhancedmagnetronsputtering.TheresultshowsthatthecrystalorientationofZr/TiAlNfilmsissimilartothatofsingle-layeredTiAlNfilms,butthedifferenceisthatAlN(111)ofZr/TiAlNfilmsdisappearscompletely.WithrespecttoZrinterlayer,thetexturecoefficientofZr/TiAlNfilmsisapproximately1.Zr/TiAlNfilmsexhibitacompactisometricstructure,whichisdistinctlydifferentfromthecolumnarstructureexistinginthesingle-layeredTiAlNfilmsandTi/TiAlNfilms.ThehardnessandH3/E*2ofZr/TiAlNfilmsare,respectively,enhancedtobe36.6GPaand0.147.Withafewcracksemergingaroundtheindention,theadhesionstrengthofTiAlNfilmsisobviouslyadvancedbyaddingZrmetalinterlayer.
简介:Zr和它的合金作为新结构的材料有优秀机械性质,但是在特定的申请环境,它的腐蚀抵抗仍然需要进一步被探索。在这个工作,两倍发光血浆表面alloying技术在纯Zr表面上被用于copperizing。而且,X光检查衍射(XRD),扫描电子显微镜(SEM)和精力分散光谱(版本)被采用描绘样品。而且,研究也在不同答案在样品的极化曲线上被进行。表面上的Copperizing能在3.5改进纯Zr的腐蚀抵抗?%NaCl并且0.5?摩尔
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:铁(Fe)在铝(艾尔)有低稳固的溶解度,并且它通常形成Fe富有的金属间化合的混合物。钪(Sc)是能充当谷物的一个元素更精制,修改最容易溶解的硅并且同时改变Fe富有的金属间化合的混合物的形态学。现在的工作被进行在Al-7Si-0.3Mg的机械性质上学习Sc的效果。合金被准备由压榨在Fe的二个层次扔(0.2和0.4?wt%)并且Sc的三个层次(0wt%,0.2wt%并且0.4?wt%)。Sc被发现增加合金的机械性质,包括它的坚硬,收益力量和最终的张力的力量。在0.2点?wt%Fe,当维持好延伸时,增加的Sc增加力量。在0.4点?wt%Fe,增加的Sc增加力量,但是减少延伸稍微。金属间化合的混合物和最容易溶解的硅的分布和形态学影响延伸。Fe富有的金属间化合的混合物和Sc富有的金属间化合的混合物充当裂缝开始地点。0.2?wt%Fe?+?0.2?wt%Sc合金有这些金属间化合的混合物的最低数量,并且最容易溶解的硅小、含纤维。那么,它有最高的延伸。
简介:有不同Y_2O_3内容的基于钴的合金被扔用血浆的onQ235A碳钢转移了焊接机器的弧(PTA)。微观结构上的Y_2O_3的效果并且穿基于钴的合金的抵抗性质用一台光显微镜,一台扫描电子显微镜(SEM),X光检查衍射(XRD),和传播电子被调查显微镜学(TEM)。有face-centeredcubic晶体结构的一个基于钴的稳固的答案被介绍,这被发现在Y_2O_3免费的基于钴的合金涂层与六角形的晶体结构由第二等的阶段M_7C_3伴随了。几叠差错在基于钴的稳固的答案存在。Y_2O_3的增加在修改Y_2O_3的涂层导致Y_2O_3阶段的存在。尽管叠差错在修改Y_2O_3的涂层存在,它的密度增加。Y_2O_3的增加能精制微观结构并且当它的内容小于等于0.8wt.%时,能增加wear抵抗性质。然而,它的内容的另外的增加将在γ-Cograin边界导致undissolvedY_2O_3粒子的凝块,并且将导致粗糙的微观结构并且降低穿抵抗性质。