Template-free fabrication of fractal porous Y2O3 monolithic foam and its functional modification by Ni-doping
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DOI: 10.1007/s40843-020-1317-1
Abstract: 自相似的分形结构如云、树、雪花、闪电、人类循环系统 等广泛存在于自然界中, 然而自然界中自发形成的分形结构很难 用常规的实验室合成方法得到. 本文利用一种无模板的、基于金 属-小分子配位聚合作用的自组装方法, 制备了具有分形孔结构的 整体钇-氨基酸配合物材料, 并通过焙烧得到分形孔结构Y2O3. 材 料的孔尺度分布范围从微米到纳米尺度, 最为有趣的是, 这种孔结 构表现出自相似特征的结构, 即任意一级的大孔的孔壁都是由次 级尺度范围的二级小孔孔结构组成. 整体配合物由几十微米的微 米孔构筑而成, 微米孔的孔壁由尺度更小的次级微米孔组成, 次级 微米孔的孔壁继续由100 nm左右的纳米孔组成. 继续放大后可以 看到纳米孔的孔壁包含由纳米晶粒堆积而成的更小的介孔 (2–10 nm). 通过在合成中引入其他金属阳离子(Ni2+, Bi3+, Ce3+, Eu3+), 可以得到分形孔包裹镶嵌的掺杂型分形孔混合氧化物. 以 Ni2+为例, 分散的NiO纳米颗粒嵌入Y2O3泡沫分形孔结构中. 在乙… read more here.
Keywords: y2o3; free fabrication; porous y2o3; fractal porous ... See more keywords
Effect of Y2O3 addition on tribological properties of plasma sprayed Al2O3-13% TiO2 coating
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DOI: 10.1016/j.ceramint.2020.01.214
Abstract: Abstract The effect of Y2O3 addition on structure, mechanical properties and tribological properties of Al2O3-13 wt% TiO2 coating was investigated. The addition of 20 wt% Y2O3 resulted in better densification, stabilization of alpha (α) alumina phase and… read more here.
Keywords: y2o3; tio2 coating; addition; al2o3 tio2 ... See more keywords
Influence of Y2O3 on the microstructure and tribological properties of Ti-based wear-resistant laser-clad layers on TC4 alloy
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DOI: 10.1016/j.ceramint.2020.02.159
Abstract: Abstract Multi-track Ti-based wear-resistant composite coatings were fabricated on TC4 alloy surfaces using laser-clad TC4 + Ni45 + Co–WC mixed powders with different Y2O3 contents (0, 1, and 3 wt%). The microstructure, microhardness, and tribological properties of the coatings were… read more here.
Keywords: y2o3; laser clad; based wear; tc4 alloy ... See more keywords
Effect of milling ball size on the densification and optical properties of transparent Y2O3 ceramics
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DOI: 10.1016/j.ceramint.2020.10.035
Abstract: Abstract In this study, we report highly transparent Y2O3 ceramics fabricated by hot-pressing only at 1500 °C without a HIP treatment, featuring in-line transmittance levels of 77% and 84% at a wavelength of 400 and 1100 nm,… read more here.
Keywords: transparent y2o3; y2o3; ball size; optical properties ... See more keywords
Fabrication of infrared-transparent Y2O3–MgO composites using nanopowders synthesized via thermal decomposition
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DOI: 10.1016/j.ceramint.2021.01.164
Abstract: Abstract In this study, pure and fine composite nanopowders with equal volume fractions of Y2O3 and MgO were synthesized via thermal decomposition of nitrate mixtures at a relatively low temperature (600°C). To improve the performance… read more here.
Keywords: y2o3 mgo; thermal decomposition; mgo composites; y2o3 ... See more keywords
A novel approach of synthesizing nano Y2O3 powders for the fabrication of submicron IR transparent ceramics
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DOI: 10.1016/j.ceramint.2021.02.270
Abstract: Abstract A facile methodology of synthesizing highly reactive, round-edged, Sulfur–free nano Y2O3 powders to fabricate submicron IR transparent yttria ceramics having a unique combination of superior optical and mechanical properties are reported for the first… read more here.
Keywords: y2o3 powders; nano y2o3; novel approach; y2o3 ... See more keywords
High temperature tensile properties and fracture behavior of Y2O3-bearing Ti-48Al-2Cr-2Nb alloy
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DOI: 10.1016/j.intermet.2020.106933
Abstract: Abstract In present work, the effect of Y2O3 on tensile properties and fracture behavior of Ti-48Al-2Cr-2Nb alloy at elevated temperature was investigated. The alloys were successively fabricated by induction skull melting. The results revealed that… read more here.
Keywords: alloy; y2o3; temperature; tensile properties ... See more keywords
Tailoring the initial characterization of fully stabilized HfO2 with Y2O3/Ta2O5
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DOI: 10.1016/j.jallcom.2021.159113
Abstract: Abstract New ceramic materials for thermal barrier coating (TBC) are a key to more powerful and efficient next-generation gas turbines. Here, we investigate the effect of the two novel dopants, Ta2O5 and Y2O3, on the… read more here.
Keywords: hfo2 y2o3; stabilized hfo2; ta2o5; y2o3 ... See more keywords
Up-conversion luminescence enhancement and tunable emission color of Y2O3: Tm/Yb@Y2O3: Yb@Y2O3: Er/Yb multilayer thin films
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DOI: 10.1016/j.jallcom.2021.160151
Abstract: Abstract The Y2O3: Tm/Yb, Y2O3: Tm/Yb@Y2O3: Yb and Y2O3: Tm/Yb@Y2O3: Yb@Y2O3: Er/Yb thin films are successfully prepared via spin-coating method. The surface grain size of the thin films is changed by multiple calcinations. The up-conversion… read more here.
Keywords: thin films; conversion; emission; luminescence ... See more keywords
Optical properties and laser performance of Nd:Y2O3 ceramics with fine-grained microstructure
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DOI: 10.1016/j.jeurceramsoc.2021.02.024
Abstract: Abstract Transparent neodymium doped Y2O3 ceramics is adopted for use in high power solid-state lasers due to their superior thermal characteristics compared to YAG ceramics. To fabricate highly transparent Y2O3 ceramics, the microstructural evolution was… read more here.
Keywords: hot pressing; y2o3 ceramics; grained microstructure; y2o3 ... See more keywords
Tunable multicolor emission based on dual-mode luminescence Y2O3: Eu@SiO2/Y2O3: Er(Tm/Yb) composite nanomaterials
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DOI: 10.1016/j.jlumin.2021.118541
Abstract: Abstract Rare earth doped materials with dual-mode luminescence have broad application potential. Among them, the dual-mode luminescence ink has been widely concerned in the field of anti-counterfeiting technology. In this work, the Y2O3: Eu@SiO2 nanomaterials… read more here.
Keywords: y2o3; y2o3 sio2; luminescence; sio2 y2o3 ... See more keywords