简介:Howtocontrolmeltcompositionisthekeyforgettinghighqualityalloymelt.Thepapermadethefollowingefforts:(1)TheactivitycoefficientsinTi-15-3melthavebeencalculated.(2)Takingadvantageoftheactivitycoefficients,theevaporationlossesofcomponentsinTi-15-3meltduringISMprocesshavebeenstudied.Thecalculatedresultsshowthatthereisacriticalvacuumdegree(about1.33Pa)duringmeltingprocess.
简介:基于ABAQUS/Explicit对Ti-15-3钛合金室温锥杯成形实验中悬空侧壁起皱现象进行分析,通过对零件边缘的皱纹波长和峰高的定量研究,获取较适合Ti-15-3钛合金室温成形侧壁起皱的模拟参数。将Ti-15—3钛合金室温锥杯成形起皱获取的模拟参数,用于Ti-15-3钛合金凸弯边橡皮成形起皱的预测,通过定量比较凸弯边边缘的皱纹波长和峰高,分析不同硬度的橡皮对Ti-15-3钛合金凸弯边橡皮成形起皱的影响。经实验验证,有限元模拟对Ti-15—3钛合金凸弯边上皱纹的模拟与实验结果有很好的一致性。
简介:Er^3+-dopedSrBi4Ti4O15-Bi4Ti3O12(SBT-BIT-xEr^3+,x=0.00,0.05,0.10,0.15and0.20)inter-growthceramicsweresynthesizedbythesolid-statereactionmethod.Structural,electricalandup-conversionpropertiesofSBT-BIT-xEr^3+wereinvestigated.Allsamplesshowedasinglephaseoftheorthorhombicstructure.RamanspectroscopyindicatedthattheEr^3+substitutionforBi^3+atAsitesofthepseudo-perovskitelayerincreasesthelatticedistortionofSBT-BIT-xEr^3+ceramics.ThesubstitutionofBi^3+byEr^3+leadstoadecreaseofdielectriclosstanδandanincreaseofconductivityactivationenergy.Piezoelectricconstantd33wasslightlyimproved,butdielectricconstantwasdecreasedwiththeEr^3+doping.TheSBT-BIT-xEr^3+ceramicwithx=0.15exhibitstheoptimizedelectricalbehavior(d33~17pC/N,tanδ~0.83%).Moreover,twobrightgreen(532and548nm)andonered(670nm)emissionbandswereobservedunderthe980nmexcitation.Optimizedemissionintensitywasalsoobtainedwhenx=0.15fortheSBT-BIT-xEr^3+ceramic.Therefore,thiskindofceramicsoughttobepromisingcandidatesformultifunctionaloptoelectronicapplications.
简介:一年一度的“3·15国际消费者权益日”已经成为广大消费者企盼的节日。每逢佳节来临,各级质监和工商部门,必定会大举出动,进行各种宣传、咨询,受理投诉,免费检测,以及举办文艺活动,这一切似乎已成为惯例,究其目的只有一个,帮助广大消费者维护自己正当的、合法的权益。作为消费者,特别是那些吃了亏,上了当,受到侵害,有质量纠纷而无处诉的消费者,想在这一天,这一举国的活动中讨回公道。这一天,全国大小城市都将会热热闹闹。从“安全健康消费”,“明明白白消费”到今年的“质量:关系生命安全,关系百姓生活”的活动主题,无非是让消费者懂得消费过程中如何保护自己而免受损失和遭受不
简介:今年已经是"3·15"(国际消费者权益日)走过的第26个年头了,也是中国改革开放伟大历程的第31个年头。回首这30年的光辉历程,我总会想起罗马神话中的那位看门神雅努斯。神每天都会把天空的大门打开,让阳光普照大地。黄昏来临时
简介:15%Ag-addedcubicperovskitesSr0.9La0.1TiO3andRuddlesden-Popper(RP)phasesSr2.7La0.3Ti2O7werefabricatedviahydrothermalsynthesis,coldpressingandhigh-temperaturesintering.Thestructureandthermoelectricpropertieswerealsoinvestigatedforallsamples.TheresultsindicatedthatAgprecipitatedasasecondphase.AgadditionmadeelectricalconductivityandabsoluteSeebeckcoefficientenhanced,asaresult,theZTvalueswereenhancedbothfortwoseries.Comparedwithcubicperovskite,RPphasewassubjectedtosmallerimpactbyAgaddition.ThereasonsforenhancingZTvalueandthedifferentimpactfortwoseriesbyAgadditionwerealsodiscussed.