Coatings
·
2023
·Vol. 13
·期 5
·956
·
IF 3.4
Shaohua Zhang,Jinfang Wang,Meng Zhang,Longqi Ding,Huijun Chan,Xiyu Liu,Fengqing Wu,Zhibiao Tu,Ling Shao,Nengyong Ye,Sheng Dai,Liu Zhu,Shichang Chen
Sintering additives are commonly used to reduce the conditions required for densification in composite ceramics without compromising their performances simultaneously. Herein, SiC/SiCw-Y2O3composite ceramics with 10 vol.% SiC whiskers (SiCw) and different Y2O3contents (0, 2.5, 5, 7.5, and 10 vol.%) were fabricated by hot-pressed sintering at 1800 °C, and the effects of Y2O3content on the microstructure, mechanical properties, and tribological behaviors were investigated. It was found that the increased Y2O3content can promote the densification of SiC/SiCw-Y2O3composite ceramics, as evidenced by compact microstructure and increased relative density. The Vickers hardness, fracture toughness, and flexural strength also increased when Y2O3content increased from 2.5 vol.% to 7.5 vol.%. However, excessive Y2O3(10 vol.%) aggregated around SiC and SiCwweakens its positive effect. Furthermore, the Y2O3additive also reduces the coefficient of friction (COF) of SiC/SiCw-Y2O3composite ceramics, the higher the Y2O3content, the lower the COF. The wear resistance of SiC/SiCw-Y2O3composite ceramics is strongly affected by their microstructure and mechanical properties, and as-sintered SiC ceramic with 7.5 vol.% Y2O3(Y075) shows the optimal wear resistance. The relative density, Vickers hardness, fracture toughness, and flexural strength of Y075 are 97.0%, 21.6 GPa, 7.7 MPa · m1/2, and 573.2 MPa, respectively, the specific wear rate of Y075 is 11.8% of that for its competitor with 2.5 vol.% Y2O3.Keywords:SiC/SiCw-Y2O3ceramics;hot-pressed sintering;Y2O3additive;mechanical properties;tribological behaviors
研究领域:
材料科学
·
陶瓷工程
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 6
·6188-6192
·
IF 1.798
Wu Yeqiu,Jin Guangya,Liu Zhijian,He Tao
Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ particles with spherical morphology are synthesized by microwave-assistant hydrothermal process. The results show that cubic phase Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ particles with uniform size and spherical shape are obtained. The doping Eu 3+ and Bi 3+ ion have no influence on the phase and morphology of samples. In the hydrothermal process, the fast and homogeneous microwave heating benefits the formation of samples with uniform size and spherical shape. Both Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ show dominant red emission originating from the 5 D 0 → 7 F 2 transition of Eu 3+ . The codoping Bi 3+ can enhance the intensity of Eu 3+ emission.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Physics Impact
·
2025
·
IF 4.3
Zixuan Jiang,Bing Liu,Zehua Zhang,Lili Wang,Zhixu Jia,Dan Zhao
The co-doping effect of Zr 4+ ions on upconversion (UC) luminescent properties in visible region of Y 2 O 3 : Er 3+ and Y 2 O 3 : Er 3+ , Yb 3+ sub-microcrystals prepared by urea precipitation method has been investigated under 980 nm excitation. Compared with the original Y 2 O 3 : Er 3+ and Y 2 O 3 : Er 3+ , Yb 3+ sub-microcrystals, the UC luminescence of sub-microcrystals with similar size was enhanced after Zr 4+ ions co-doping. The UC luminescent properties have been discussed in detail via luminescence spectra, decay curve analysis and a suitable energy level diagram. The enhancement mechanism of UC luminescence in the two series of Zr 4+ ions doped sub-microcrystals was attributed to the complex crystal field around Er 3+ ions caused by Zr 4+ ions co-doping. After Zr 4+ ions substituted Y 3+ ions and entered the crystal lattice, the charge mismatch and lattice distortion made the crystal field more complex. This research contributes to the understanding of UC luminescent properties of lanthanide (Ln 3+ ) ions doped UC materials and their technological applications in fields such as bioimaging, drug delivery, and optical temperature sensors.
研究领域:
材料科学
·
光学
·
生物成像
·
药物递送
·
光学温度传感器
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Liyu Li,Tao Dong,Chunhuan Guo,Fengchun Jiang,Zilong Shen,Yang Liu,Mingxia Diao,Haolun Song
To reduce cracking in Mar-M247 superalloy of Selective Laser Melting (SLM) manufacturing, this research explores the impact of the core–shell structure formed by adding different contents (0.5 and 1.0 wt%) of Y 2 O 3 nanoparticles on the microstructure, crack behavior, and mechanical properties. Y 2 O 3 -doping facilitates the transition from columnar to equiaxed grains in the SLM process. The reaction of Y 2 O 3 nanoparticles with oxide-forming elements in Mar-M247 alloy promotes the formation of Y 2 Hf 2 O 7 , which could act as the nucleation sites for MC carbides, forming a core–shell structure with Y 2 Hf 2 O 7 as the core and MC carbides as the shell. The dispersed core–shell nanoparticles lead to the distribution of carbides both inside cells and at the cell boundaries, contribute to the reduction of dislocations pinned by MC carbides near the core–shell structure, and reduce the formation of dislocation walls, which helps to inhibit cracking. Moreover, both the γ′ phase and the core–shell structures can impede dislocation motion, alleviating local stress concentration at cell boundaries. The effect of Y 2 O 3 nanoparticles on the metallurgical behavior of the molten pool and precipitation characteristics during the SLM process is analyzed to reveal the mechanism of the interactions between precipitates and dislocations as well as the crack inhibition.
研究领域:
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 8
·期 2
·1901209
·
IF 7.125
Xiao Chen,Weijing Yao,Qi Wang,Wei Wu
Owing to the large coding capacity and high confidentiality, dual-mode or multimode anticounterfeiting fluorescent materials are gradually substituting traditional single-mode fluorescent materials. Herein, a facile hydrothermal method is designed and used to integrate lanthanide ion (Ln 3+ )-doped NaLuF 4 nanoparticles with Y 2 O 3 -based downconversion nanorods, achieving the construction of dual-mode luminescent composite materials. The excellent optical properties of NaLuF 4 /Y 2 O 3 composites are confirmed by photoluminescence spectroscopy. The composites can be excited by a 980 nm laser to generate bright red, green, and blue colors (corresponding to Er 3+ /Tm 3+ -, Yb 3+ /Ho 3+ -, and Yb 3+ /Tm 3+ -doped NaLuF 4 , respectively), and turn into dim-red and green colors under an excitation source of 254 nm. Furthermore, the polyvinyl alcohol (PVA)-mediated stable fluorescent inks are successfully formulated and then printed onto the paper, aluminum foil, and fabric by low-cost and simple screen printing techniques to fabricate various anticounterfeiting patterns. Interestingly, the printed patterns are hard to observe under ambient light, enabling the generation of multiple emission color under excitations of 980 and 254 nm. The prepared dual-mode NaLuF 4 /Y 2 O 3 composite materials with outstanding stability and distinctive multicolor luminescent properties provide low-cost, highly effective, multilevel protection for genuine products against counterfeit.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2013
·
IF 1.547
Lijun Luo,Fenfen Hu,Li Xiong,Xiaofan Li,Meili Zhou,Zhengliang Wang
A series of red phosphors Y2O3:Eu3+ were prepared by the molten salt method with different surfactants. Their structures, morphologies, and the photoluminescent properties were investigated at room temperature. The particles size of Y2O3:Eu3+ can be controlled by adjusting the kinds of surfactants. The phosphor Y2O3:Eu3+ prepared with NP-10 [polyoxyethylene (10) nonyl phenyl ether] shows regular morphology and higher crystallinity, and its average particle size is about 200 nm. Bright red light can be observed by naked eyes from the red phosphor under 254 nm excitation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Qibai Wu,Shaoteng Lin,Zhongxiang Xie,Liqing Zhang,Yannan Qian,Yaodong Wang,Haiyan Zhang
Monodisperse Y 2 O 3 : Er 3+ /Yb 3+ /Tm 3+ nanoparticles with various dopant concentrations have been synthesized successfully by a homogeneous precipitation method. Their phase structures and surface morphologies have been characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The diversities of upconversion luminescence spectra and CIE coordinates of prepared samples are investigated in detail at room temperature under 980 nm excitation. Through adjusting the concentrations of Yb 3+ , Tm 3+ and Er 3+ ions, three upconversion emission bands in red, green and blue region could be tunable to achieve the color of interest and near white light emission can be obtained in the tri-doped Y 2 O 3 nanoparticles for a variety of application.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yiming Yu,Yaowu Wei,Conghua Peng,Yuan Chen,Junfeng Chen,Bingqiang Han
Y 2 O 3 materials have become a popular candidate for preparing refractory crucibles for ultra-pure high-temperature alloy melting in recent years. However, its difficulty in sintering and poor thermal shock resistance limited its industrial application. The effect of CaF 2 on the densification microstructure, mechanical properties , and thermal shock resistance of Y 2 O 3 materials was investigated in this paper. The main purpose of this study was to optimize the amount of CaF 2 added in the preparation of Y 2 O 3 materials to improve its thermal shock resistance and get better mechanical properties. The mechanism of the densification process of CaF 2 -doped Y 2 O 3 materials was analyzed by phase analysis and microstructure. The results showed that successive doping of large Ca 2+ ions caused more lattice distortion in the Y 2 O 3 materials, and the diffusion rate of Y 3+ was increased, thus enhanced grain boundary diffusion and promoted sintering densification in the Y 2 O 3 materials. Meanwhile, the addition of CaF 2 also significantly reduced the apparent porosity and enhanced the mechanical properties of the materials. The improvement of these properties was attributed to the increased relative density of CaF 2 -doped Y 2 O 3 materials and the high sintering activity of CaF 2 . In addition, crack deflections effectively improved the thermal shock resistance of the materials. The residual flexural strength ratio of Y 2 O 3 materials doped with 1 wt % CaF 2 was increased by 21.2% after thermal shock test compared with undoped specimens.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2018
·Vol. 7
·期 4
·388-391
·
IF 1.605
Lu Youjun,Yuan Zhenxia,Shen Hongfang,Huai Xiaochen,Huang Zhenkun
Zirconium nitride (ZrN) ceramics were prepared via hot pressed sintering (HP) at 1750 °C in N 2 atmosphere with ZrO 2 –Y 2 O 3 as sintering additive. X-ray diffraction was applied to analyze the phase composition of the as-prepared ceramics to study the high temperature phase relation in ZrN–ZrO 2 –Y 2 O 3 ternary system and establish ZrN–ZrO 2 –Y 2 O 3 ternary phase diagrams. The results show that ZrN and tetragonal ZrO 2 (t-ZrO 2 ) solid solution, face-centered cubic ZrO 2 (c-ZrO 2 ) solid solution, body-centered cubic Y 2 O 3 (c-Y 2 O 3 ) solid solution coexist in the system of ZrN–ZrO 2 –Y 2 O 3 .
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2021-2028
·
IF 2.956
Xiaokai Li,Qiangqiang Zhu,Yangyang Xu,Xiaojian Mao,Minghui Feng,Benxue Jiang,Long Zhang
Highly transparent Y 2 O 3 ceramics using TiO 2 as an additive were synthesized by presintering and hot isostatic pressing (HIP). The effects of TiO 2 contents and sintering conditions on the optical properties of the final transparent ceramics were investigated. A small amount (0.04-0.16 wt%) may decrease the densification temperature by about 200°C. The Y 2 O 3 ceramics doped with 0.16 wt% TiO 2 revealed a transparency of 82% in the wavelength range 1-6 μm. The thermal conductivity of the samples is about 11.8 W/m K at 25°C, which is close to that of the undoped Y 2 O 3 ceramics.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Xinyou Huang,Xing Zhang,Zewang Hu,Yagang Feng,Jiabei Wei,Xin Liu,Xiaoying Li,Haohong Chen,Lexiang Wu,Hongming Pan,Jiang Li
Yttrium (Y 2 O 3 ) nanopowders were synthesized via the precipitation method using ammonium hydrogen carbonate (AHC) as the precipitant. The influences of calcination temperature on the composition and morphology of the powders were investigated. Fine Y 2 O 3 powders with low-agglomeration were obtained by calcining the precursor at 1100 °C for 4 h. The primary crystallites were calculated to be ∼47 nm in size and weakly agglomerated to particles with size of ∼79 nm. Using the synthesized powders as the starting materials, Y 2 O 3 ceramics were fabricated by vacuum sintering at different temperatures combined with HIP post-treatment. The densification and micro-structure evolution of the Y 2 O 3 ceramics were systematically investigated. The ceramic sample vacuum sintered at 1500 °C for 2 h and post-HIPed at 1550 °C for 3 h exhibited a uniform and fine microstructure with the average grain of about 1.0 μm. The in-line transmittance of the ceramic sample reached 80.1% at 1100 nm.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 10
·105533
·
IF 1.449
Yaping Li,Guanjie Yan,Liming Luo,Long Wang,Shican Dai,Yuting Yang,Hanhui Liu,Yue Liu,Mingliang Yuan
An ultrathin Y2O3 layer is applied to improve the unsatisfactory cyclability and rate performance of LiNi0.4Co0.2Mn0.4O2 (NCM) cathodes for the first time. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were implemented to characterize the physical performance of synthetical materials. In addition, charge-discharge cycling, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements were executed to investigate the electrochemical actions. In particular, the 0.5 wt% Y2O3-coated NCM manifests a significantly upgraded initial specific capacity of 185.4 mAh g−1 at 1 C and a capacity retention as high as 93.7% after 100 cycles. Nevertheless, bare NCM manifests a capacity retention of 59.4%. Even at 5 C, modified NCM samples still have high capacity. The remarkably ameliorative electrochemical performance of Y2O3-coated NCM materials during cycling is because of the Y2O3 coating that may hinder the deleterious reactions between the electrolyte and the cathodes and decrease the charge-transfer resistance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）