简介:来临三维(3-D)打印了技术在设定的多孔的钛(Ti)的制造提供大可能性植入。然而,打印Ti的bioinert性质提出一个突出的问题。混合微弧的氧化并且热水(MAO-HT)多孔的金属上的处理能生产multi-scaled层次矫形植入,为3-D的表面修正的出现大潜力打印了植入。在这研究,有毛孔的圆柱的多孔的Ti6Al4V(Ti64)脚手架640缩放吗??
简介:采用柠檬酸溶胶-凝胶法制备了稀土Gd3+掺杂的LaPU新型热障涂层用陶瓷粉体LaPO4(X=0.0,0.1,0.2,0.3;LGPO)。通过X-ray衍射、扫描电子显微镜、TpDSC、高温热膨胀仪和激光热导仪对样品的相组成、微观形貌、热行为、热膨胀系数和热导率进行表征。结果表明:稀土Gd3+掺杂的LGPO保持了独居石相结构;添加稀土Gd3+不仅可以降低材料的导热系数,还有利于其热膨胀系数的提高;随着稀土Gd3+掺杂量的增加,晶体中点缺陷浓度不断升高,声子平均自由程不断减小,使得稀土Gd3+掺杂的LGPO的热导率在x=0.3时达到最低值(λ=1.22w/(m·K),T=1273K),该值明显低于同温度下8YSZ的热导率。Gd3+掺杂的LaPO4体系是下一代新型热障涂层用陶瓷热门的候选材料之一。
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.