简介：MgO-ZrO2unfiredbrickswithZrO2contentupto8%attheintervalof2%wereprepared,usingfusedmagnesia(MgO:97%)andfusedMgO-ZrO2clinker(ZrO2:14.33%)asstartingmaterialsandphenolicresinasbinder.TheeffectsofZrO2contentonthermalshockresistance(TSR)andotherpropertiessuchascoldandhotmodulusofrupturehavebeeninvestigated.Residualcoldmodulusofruptureratioafterheatingat1000℃andquenchingbyairblowingwasadoptedtocharacterizeTSR.AdditionoftheMgO-ZrO2clinkerimprovesTSR,attributingtothemicrocracktougheningeffectbythermalexpansionmismatchbetweendifferentphases.WhenZrO2contentgoesabove4%,theimprovingeffecttendstobemoderate.TheintroductionofMgO-ZrO2clinkercanalsoimprovetheHMORat1500℃,whiletheincreasedZrO2contentreducesCMORofthebricksprefiredat1600℃,duetothethermalexpansionmismatcheffect.Compromisingtheoverallproperties,theoptimalZrO2contentforsuchmagnesiabasedunfiredbrickissuggestedtobe4%.

简介：ThepaperdescribestheeffectofadditivesAl,Si,SiCandB4ContheexpansionofMgO-ZrO2-Cmaterialafterbeingcoked.TheresultsindicatethatAlandSicannotincreaseitshotandcoldstrength.AlandSiwereoxidizedtoformAl2O3andSiO2respectively,andthenreactedwithCaZrO3orstabilizerinc-ZrO2toformcalciumaluminate,spinel(MA),dicalciumsilicate(C2S)andforsterite(M2S).Meanwhile,α-C2Swastransformedtoγ-C2Sandc-ZrO2tom-ZrO2whentemperaturechanged.AlltheabovereactionsresultedinthedecreaseoftheamountofAl4C3andSiCandtheincreaseinbulkvolume,whichcausedthestructureofMgO-ZrO2-Cmaterialdestroyed.Hence,contrarytotheMgO-Cmaterial,whenaddingAl.andSi,theMgO-ZrO2-Cmaterialwouldbestructurallydeterioratedafterheat-treatmentanditsstrengthandcorrosionresistancedecreased.

简介：ZrO2陶瓷由于其独特的相变效应与高温氧离子导电现象使其得到越来越广泛的应用。在制作ZrO2陶瓷的过程中，制得性能优良的粉末是关键的第一步。性能优良的粉末粒度要细且粒度分布范围窄。此外，超细粉具有强烈的扩散能力，在烧结后期容易达到高密度甚至完全致密化。

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简介：AkindofZrO2ceramicmaterialforporousmediaburnerwaspreparedbypolymericspongeprocesswithstartingmaterialsofzircon,zirconiapowder,microsilica,andballclay,andbinderofsilicasolthroughreaction-sintering.Theeffectsofmicrosilicaadditiononcoldcrushingstrengthandzirconia/zirconaddingratioonthermalshockresistancewerestudied.Theresultsshowthattheporousmediamaterialhasproperporosity,highstrength,andexcellentthermalshockresistancewhenzirconiaadditionis85%andzirconadditionis5%.Theperformanceindexesare:porosity82%,coldcrushingstrength3.1MPa,thermalshockresistancemorethan10cycles,andgoodthermalshockresistanceto1500℃flame.

简介：[埃及土人_(1.5nm)/ZrO_(2xnm)]_(10)多层的电影被磁控管劈啪作响在玻璃底层上扔然后为30min在600℃在真空退火了。他们的结构和磁性作为ZrO_2内容的功能被调查。结果证明谷物尺寸和coercivity首先随ZrO_2内容的增加增加然后减少。Themaximumcoercivity和谷物尺寸在ZrO_2的37vol.%被获得。在这部电影的ZrO_2的内容在埃及土人谷物的分离并且在intergrainexchange相互作用的减小起一个重要作用。根据尖依赖coercivity的研究，埃及土人的磁化颠倒拍摄与，这被发现(111)质地与领域墙运动或旋转模式的S-W类型不同。

简介：Inthis,phasecompsitionandthermalexpansionbehaviourofCaOStabilisedrefractorieswerestudied,Specialattentionwaspaidtotheexpasionbehaviourofthreematerialswithdifferentphasecomposition,TheresearchresultsindicatedthattheexpansionbehaviourcouldbeimprovedbymodifyingthestabilizationofZrO2,whichthusleadstotheincreaseinthethermalshockresistanceandpossiblyeroionresistaceofas-obtainedCaOstabilisedZrOmaterial.

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简介：ThisworkstudiedthecharacteristicsofSiO2distributionandstructureofsilicatephasesinMgO-ZrO2compositessynthesizedbyrawmaterialsoflightfiredmagnesitendzircon,Theresultsindicatethat30wt%-40wt%SiO2contentinthesystemisexistedintheformofcrystallineofforsterite(M2S),theremainderingofSiOcontent(60wt%0-70wt%)isexistedintheglassphase,Thechemicalcompositionofglassphaseiswellagreedwiththechemicalcompositionofmonticellite(CMS).

简介：采用压痕裂纹(IM)法测定了无压烧结ZrO2基陶瓷的断裂韧性(K1c),并引入相对偏差概念表征K1c值的精确度.结果表明,由于ZrO2基陶瓷的压痕裂纹具有巴氏裂纹特征,因而只能选择Niihara(P)方程(P表示巴氏裂纹)、Shetty方程、Laugier方程或Marshall方程等来计算K1c.其中,用Niihara(P)压痕方程计算的K1C值最符合实际,且具有最小的相对偏差.因此,正确判断压痕裂纹类型、选择合适的压痕方程及科学处理实验数据等,都将有利于提高压痕断裂韧性的测定精度.

简介：ZrO2nanopowdersbasedstearicacidphasechangematerials(PCMs)werepreparedbyhigh-energymilling.Theconceptofheatcapacityfactor(HCF)wasusedtoanalyzethethermalpropertiesofthematerials.TheheatstoragepropertyofPCMs,containingthesamecontentofstearicacid(23%bymass)inthestartingmaterialsbutsynthesizedbydifferenttechnicalprocesses,wasinvestigatedbyusingHCF.Itwasfoundthattherewerevastinfluencesofdifferentdispersantsontheheatcapacity.Thesamplespreparedwithchloroformprovidedthebestheatstorageabilityinallsamplestested.

简介：O'-sialon-ZrO2compositebasedonthecheapcommercialavailablezirconandsiliconasrawmaterialscanbeachievedbyusingreac-tionnitridationmethod,Moreattentionwasgiventothenitridingprocessandtheeffectofadditivesonit.Theexperimentalresultsshowthattherearetwonitridationpaths:oneisthedirectnitridationofsiliconpowderandtheotheristhroughthereactionbetweenthemedi-umcompoundZrSi2andthenitrogen.Theeffectsofadditionofcalciaandtheincorpora-tionofBNonthenitridingreactionwerealsoinvestigated,theprimitiveexperimentalresultsdemonstratedthatbothofcalciaandBNcoulddeterioratethenitridingdegree.

简介：Anewmicromechanicsconstitutivemodelforpuredilatanttransformationplasticityofstructureceramicsisproposedinthispaper.Basedonthethermodynamics,micromechanicsandmicroscalet→mtrans-formationmechanismanalysisoftheTZPandPSZZrO2-containingceramics,ananalyticexpressionsoftheHelmholtzandcomplementaryfreeenergyoftheconstitutiveelementforthecaseofpuredilatanttransforma-tionisderivedforthefirsttimeinaself-consistentmanner.Bytheanalysisofenergydissipationinthefor-wardandreversetransformations,themieromechanicsconstitutivelawisderivedintheframeworkofHill-Rice’sinternalvariableconstitutivetheory.

简介：Inthepaper,theauthorsanalysetherela-tionshipbetweentheelectricalconductivityσofZrO2andthecontentofdopedstabilizingagentbythePositronAnnihilationTechnique,andexplainthechangetendencyofσwiththecontentofstabilizingagent.Theresearchshowsthat"numberofeffectivevacancy"inmaterialisadecisivefactorcausingchangeofσ.

简介：用纳米结构粉末做喂料进行喷涂，缩短了颗粒熔化时间，在有限的飞行时间内，颗粒熔化效果更好，从而制备的涂层孔隙率更小，表面更平整。用ZrO2纳米结构喂料制备了等离子喷涂层，研究了功率、粒度、氧化钇含量等工艺参数条件下涂层的微观组织、孔隙率、相组成及抗热震性能。经X衍射分析表明，原始粉末由m-ZrO2,t-ZrO2,c-ZrO2构成，单斜相的含量为11％，主要由四方相和立方相构成。

简介：ZrO2陶瓷在窑衬、窑具、分散和研磨介质、衬热管和氧传感器等方面已有应用。本文讨论了ZrO2陶瓷的市场前景及各种不同稳定性的ZrO2陶瓷的性质。以ZrO2-Al2O3系统为基础的陶瓷则是一种有潜力的新型材料。

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：利用XRD、TPR和EXAFS等手段考察了焙烧温度对Cu/MnO2/ZrO2催化剂性能影响，结果表明，随着焙烧温度增加，铜的配位环境发生变化，铜和锰之间相互作用增强，有效地防止铜组分在还原及反应过程中聚集长大，从而使催化剂活性显著增加，当催化剂经过高温焙烧，催化剂活性由于ZrO2结晶和铜的聚集而降低。