简介：TheZrO2-Al2O3ceramiccompositeswerepreparedbyappropriatetechniqueswithcommercialZrO2andAl2O3powdersasrawmaterialsandY2O3asstabilizer.TheresultsindicatethatwiththeintroductionofAl2O3intotheZrO2matrixwherethequantityofadditiveY2O3is3.5%(molefraction),thegrowthofZrO2grainsisefficientlyinhibited,whichhelpstheZrO2grainsexistinametastabletetragonalmanner;thushigherstrengthandtoughnessareacquired.Whenthecontentofaluminais20%(massfraction),thebendingstrengthandfracturetoughnessofthecompositesare676.7MPaand10MPa·m1/2respectively,themechanicalbehaviorsareclosetothosepreparedwithZrO2andAl2O3powderssynthesizedthroughwetchemicalapproach.Themechanicalbehaviorsofthecompositesarewellimprovedowingtothedispersiontougheningofaluminagrainsandphasetransformationtougheningofzirconiagrains.

简介：采用Nb2O3、Y2O3复合稳定剂,制得了高韧性、高强度的四方相ZrO2陶瓷材料,发现在Y2O3-ZrO2材料中加入0.5～1molNb2O3,可使材料在保持原有抗弯强度的同时,一定程度上改善了断裂韧性和相组成。

简介：对以Y2O3为烧结助剂的AIN陶瓷基片进行了研究分析，推导出了AIN陶瓷热导率数学模型，确定出热导率与氧含量和Y2O3添加量之间的定量关系。

简介：ThephaseandmorphologytransformationduringthehydrothermaltreatingprocessofY2O3wasevaluatedwithX-raydiffcrcnce(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),particlesizeandspecificsurfaceareadetermination.TheresultsshowedthatthecubicY2O3didnottransferintohexagonalY(OH)3inpurewater.Therefore,purehexagonalY(OH)3withnanotubeandmicrorodmorphologieswereobtainedbyhydrothermaltreatingY2O3at150℃for12hin15mlof2mol/LNaOHsolutionwithandwith-outPVAorPEGItwassuggestedthatthecharacteristicpreferentialgrowthofY(OH)3wasattributedtothestructureanisotropyofhexahedronY(OH)3.TheadditionofPVAorPEGcouldpromotetheformingprocessofnanotubesbyselectiveadsorptionondifferentcrystalplanes,whichalteredthegrowthratealongdifferentdirectionsandresultedinthediffusionlimitofconstructingionsinthecentertopofrods.Finally,Y(OH)3:EuandY2O3:Eunanotubeswerealsosynthesizedbyusingthismethod,andtheirphotoluminescencepropertieswereevaluated.

简介：利用扩展X射线吸收精细结构技术对用化学共沉淀法制备的非晶和纳米ZrO2·15％Y2O3体系进行了研究。分析结果显示，在从非晶态向纳米结构晶化的过程中，最近邻的Zr-0配位层的配位数和键长没有发生明显的改变，说明300℃温度处理的样品已经形成的900℃温度处理相同的最近邻局域结构。而对于Zr-Zr（Y）配位层，随着晶粒尺寸的减小，配位数明显降低，键长显著缩短，具有比Zr-O配位层更大的无序。这些结果表明晶粒尺寸的变化对于较远配位层的影响要比对最近邻的影响大得多。

简介：基于国外定向凝固氧化物／氧化物共晶复合陶瓷的晶体生长动力学行为的研究成果，阐述其动力学机制，分析动力学因素对微观结构形态的影响，探讨晶体生长热力学、动力学行为与微观结构形态之间的关系，同时结合以燃烧合成、快速凝固技术制备的新型高强韧A12O3/ZrO2（Y2O3）共晶复合陶瓷，探讨共晶复合陶瓷在快速凝固条件下的晶体生长动力学行为。结合定向凝固与快速凝固两种晶体生长机制，得知过冷度、凝固界面前沿的温度梯度是影响晶体生长方式的重要因素，且受二者决定的凝固速率（即晶体生长速率）则决定材料的最终微观结构与形态。

简介：VariousaffectingfactorsanddegradationmechanismwerestudiedonultrasonicdegradationofmethylorangeadoptingY2O3dopinganataseTiO2catalystpreparedinlaboratory.Intheexperiment,theUV-VISspectrophotometerwasusedtofollowandinspectthedegradationprocessofmethylorange.TheresultsindicatethattheultrasonicdegradationratiosofmethylorangeinthepresenceofanataseTiO2catalystaremuchbetterthanthosewithoutcatalyst.Moreover,thecatalyticperformanceofY2O3dopinganataseTiO2catalystisobviouslyhigherthanthatofanataseTiO2catalystwithoutdoping.TheoptimalconditionswereadoptedinthisworkandthedegradationandCODeliminationratioofmethylorangegotto98%and99.0%in90min,respectively.

简介：Inthisstudy,factorsaffectingthecrystalstructureofflame-synthesizedY2O3:Euparticleswereinves-tigated,especiallytheparticlesizeeffectanditsinteractionwithEudopingconcentration.PolydisperseY2O3:Eu(sizerange200nmto3m)powdersampleswithEudopingconcentrationsfrom2.5mol%to25mol%weregeneratedineitherH2/airorH2/O2substrate-freeflames.ThecrystalstructureofthepowdersampleswasdeterminedbypowderX-raydiffraction(XRD),whichwascomplementedbypho-toluminescence(PL)measurements.Singleparticlecrystalstructurewasdeterminedbysingleparticleselectedareaelectrondiffraction(SAED),andforthefirsttime,byelectronbackscatterdiffraction(EBSD).H2/airflamesresultedincubicphaseY2O3:Euparticleswithhollowmorphologyandirregularshapes.ParticlesfromH2/O2flameshaddenseandsphericalmorphology;sampleswithlowerEudopingconcen-trationshadmixedcubic/monoclinicphases;sampleswiththehighestEudopingconcentrationswerephase-puremonoclinic.ForsamplesgeneratedfromH2/O2flames,aparticlesizeeffectanditsinteractionwithEudopingconcentrationwerefound:particlessmallerthanacriticaldiameterhadthemonoclinicphase,andthiscriticaldiameterincreasedwithincreasingEudopingconcentration.Thesefindingssug-gestthattheformationofmonoclinicY2O3:Euisinevitablewhenextremelyhotsubstrate-freeflamesareused,becausetypicalflame-synthesizedY2O3:Euparticlesizesarewellbelowthecriticaldiameter.However,itmaybepossibletogenerateparticleswithdense,sphericalmorphologyandthedesiredcubicstructurebyusingamoderatelyhighflametemperaturethatenablesfastsinteringwithoutmeltingtheparticles.

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简介：摘要：金刚石工具作为一种新兴的超硬材料制品，是对传统工具的一种革命性替代和跨越性发展，广泛应用于各类硬脆非金属材料及部分金属材料的切、磨、钻、铣、抛等加工领域，涉及建筑、建材、石油、地质、冶金、机械、电子、陶瓷、木材、汽车等工业。近年来，随着大宗商品的价格上涨，金刚石工具成本上升幅度巨大，成本更加优势的铁基金刚石工具得到了迅猛的发展，但铁基胎体的工艺范围狭窄及合金化程度不足，导致产品性能不稳定，在一定程度上限制了其发展。Y2O3作为一种优良的增韧填料，能够改善铁基金刚石工具的力学性能和耐用度。本文以铁基胎体为主要原料，采用添加Y2O3的方法，研究了Y2O3含量对铁基金刚石工具的硬度、抗弯强度、断裂韧性和耐磨性的影响，以供参考。

简介：FourkindsofY2O3stabilizedZrO2(YSZ)thinfilmswithdifferentY2O3contents(from0to12mol%)aredepositedonBK7glasssubstratesbyelectron-beamevaporationmethod.TheeffectsofdifferentY2O3dopantcontentsonresidualstress,structure,andopticalpropertiesofZrO2thinfilmsareinvestigated.TheresultsshowthatresidualstressinYSZthinfilmsvariesfromtensiletocompressivewiththeincreaseofY2O3molarcontent.TheadditionofY2O3isbeneficialtothecrystallizationofYSZthinfilmandtransformationfromamorphoustohightemperaturephase,andtherefractiveindexdecreaseswiththeincreaseofY2O3molarcontent.Moreover,thevariationsofresidualstressandtheshiftsofrefractiveindexcorrespondtotheevolutionofstructuresinducedbytheadditionofY2O3.

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。

简介：作为报导Y2O2S的改进:Tb3+，白光的长持续的黄磷：Y2O2S:Tb3+，Sm3+被准备由固态反应。光致发光系列证明在紫外刺激下面的Tb3+和Sm3+排出物的位置和形状在这位主人是类似的，它在不同刺激下面保证了一种稳定的白排放颜色(IEC的日光标准)。共同做的样品的腐烂曲线显示二个离子的排出物的腐烂时间是靠近的。热照明测量建议做的Sm3+离子创造的陷井是有用的推迟共同做的样品的白晚霞。因此，共同做的Sm3+离子的功能作为改进样品的白排放颜色并且充当新陷井中心被证实。

简介：利用DTA、XRD研究了Y2O3的添加对CaO-MgO-SiO2系陶瓷纤维析晶行为的影响。根据Ozawa和Kissinger法对系统中析晶活化能的计算结果表明，少量Y2O3的添加并没有改变材料中析出的晶相种类，但是可以提高玻璃化转变温度和析晶温度，增大晶相的析晶活化能，从而能够在一定程度上抑制材料中晶相的析出。

简介：以超重力场辅助燃烧合成技术制备了呈梯度分布的Y2O3-Al2O3-SiO2玻璃／Y3Al5O12陶瓷梯度复合材料。结果表明，梯度布置两种组分的原料既可防止下层熔体的喷溅，又能提高上层玻璃的透过率。该梯度材料沿超重力方向依次为YAS透明玻璃层、YAS-YAG玻璃陶瓷层和YAG陶瓷层。

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简介：sintering，微观结构，机械性质和氧化钇的低温度降级行为上的研究稳定四角形的氧化锆多晶体(3Y-TZP)被执行。结果证明Al_2O_3和MgO的增加在低温度改进sintering，并且引起夸大的谷物生长和tetragonal-ZrO_2的转变tomonoclinic-ZrO_2，与在机械性质的相应变化。theyttria免费的单斜晶的氧化锆粒子的增加改变全面氧化钇分发并且导致韧化机制的活跃转变。而且，驱散的没有氧化钇的ZrO_2能禁止四角形的氧化锆转变，它对3Y-TZP陶艺的低温度降级行为的改进有益。

简介：TheRamanspectraof3%(molefraction)Y2O3-ZrO2(3Y)areobtainedatdifferenttemperaturefrom77Kto853K.Theresultsshowthat260cm-1Egand460cm-1Egmodesonthespectrashifttowardlowerwavenumberwiththeincreaseoftemperature;meanwhile,thecontinuityoftheHalfWidthatHalfMaximum(HWHM)andwavenumber(frequency)ofRamanbandsarebrokenandt-phaseonlypartiallytransformstom-phaseat523K.Basedontheexperimentalresults,thispaperdiscussesthet-phaselatticevibrationof3YandpresentstheimagesofvibrationdisplacementofsixRaman-activemodesfort-phaseofZrO2.TheanalysisindicatesthattherearediversitiesexistinginthedisplacementoftheatomicvibrationofRaman-activemodesbecauseoftheirdifferentsymmetriesatvarioustemperature,whichleadstothedifferentchangetendenciesofRamanbands.Furthermore,theabruptchangesofsomeRaman-activemodesindicatingtheatomicdisplacementareassumedtobethecondensationsofphononmodesinthet→mphasetransition.

简介：NewrareearthvanadatesYSrQ-xCaxV3O9-y（x=0.0,0.67,1.0,1.33and2.0）havebeensynthesizedbyanewsimplemethod.X-raypowderdiffractionresultsshowthattheyaremono-phase.Theybelongtoorthorhombicstructureandtheirlatticeconstantsarecalculated.TheresultsofweightgainsinTGcurvesshowthatthelowervalentvanadiumisoxidizedtohighervalentstateathighertemperature.Theoxygencontentsofnewcompoundsarecalculatedfromtheweightgains.BothV3+andV4+coexistinYSr2-xCaxV3O9-y.Thesecompoundsexhibitlowelectricresistivityatroomtemperature.