CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yingchun Shan,Xuemin Xi,Liya Ma,Haoran Guo,Xiaoguang Han,Jiangtao Li,Jiujun Xu
In consolidation of AlON , the extensive decomposition of AlON into α-Al 2 O 3 and AlN during sintering is one of the major reasons that significantly retard its densification process. To accelerate densification of AlON, an ultra-low concentration of La 2 O 3 (0.03 wt%) and Y 2 O 3 (0.02-0.04 wt%) was co-doped as sintering additives to inhibit decomposition of AlON during sintering for fast fabrication of highly transparent AlON ceramics. The phase transformation, microstructure evolution and densification process of the samples undoped and doped additive during heating were studied to investigate the densification mechanism. The results reveal that, compared to the samples undoped additive and single-doped with La 2 O 3 , the α-Al 2 O 3 content of the samples co-doped with La 2 O 3 and Y 2 O 3 is significantly deduced at ≤1600 °C, which indicates that the decomposition of AlON is effectively inhibited by co-doping La 2 O 3 and Y 2 O 3 . The reduction of α-Al 2 O 3 along with the deceleration effect of La 3+ on mass transfer, contributes to more small particles being conserved at high temperatures. Base on this, at later stage of sintering, benefiting from the enhanced mobility of grain boundary by Y 3+ , AlON ceramics with high relative density (99.79 %) and excellent transparency were obtained via pressureless sintering at 1880 °C for 2.5 h by co-doping 0.03 wt% La 2 O 3 and 0.04 wt% Y 2 O 3 . The maximum transmittance of the fabricated AlON ceramics is up to 81.6 % at 3600 nm, and a transmittance of 76.0 % was measured at 400 nm. The ultra-low doping amount of La 2 O 3 and Y 2 O 3 and the high relative density should be the main reasons that lead to the outstanding transparency of the obtained AlON. Additionally, the fabricated AlON ceramics also exhibit a high Vickers hardness of 18.89 ± 0.18 GPa.
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
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Huadong Fu,Rui Chen,Yong Xie,Zheng Wei,Yan Qin,Zhixiong Huang
Element-hybrid phenolic aerogel composites are often utilized as lightweight thermal protection materials for aerospace craft. Zr-phenolic (Zr-PR) aerogels have been extensively studied due to their exceptional high-temperature resistance. However, the phase transformation of ZrO2, the pyrolysis product of Zr-PR, caused the volume changes and internal stresses, greatly limiting the application of Zr-PR. In this work, a small amount of nano-Y2O3 particles was directly doped into the Zr-PR aerogel composites to form the nanoscale mosaic structure. This aerogel composite exhibited properties of low density (0.51 g/cm3) and low thermal conductivity (<0.151 W/(m K)); moreover, it showed a significant improvement in oxidative ablation resistance with a 33% reduction in the linear ablation rate. The research indicated that the doping of nano-Y2O3 effectively addressed the adverse effects associated with ZrO2 phase transformation by in situ rapidly forming (<60s) the dense yttria-stabilized zirconia (YSZ) thermal barrier layer on the ablation surface, which significantly delayed the thermal-oxidative ablation of the composites. Additionally, the pyrolytic carbon (PyC) on the ablation surface can form abundant multilayered graphene structures due to the catalytic graphitization effect produced by the solid-solution reaction of YSZ, which further enhanced the oxidation resistance. This work provides a simple and efficient approach to improve the ablation performance of Zr-PR aerogel composites, broadening their application in extreme thermal environments.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
PubMed
高影响因子
Radiation Effects and Defects in Solids
·
2024
·
IF 1.1
X.L. Ren,G. Yao,L.M. Luo,Y. Xu,A. Yabuuchi,Q. Xu
In the present study, we developed Mo- and Zr-added W-Y2O3 composites, and investigated their surface damage, including commercially available W induced by He and D as well as He and D mixture plasmas. Blistering was not observed in the D-plasma-irradiated W and W composites. The thickness of the damaged surface layer due to He plasma exposure of the W-Mo-Y2O3 composite was similar to that of W. However, the thickness of the damaged surface layer of the W-Y2O3 composite was half that of W. In addition, the thickness of the damaged surface layer of the W-Zr-Y2O3 composite was further improved by 5 times. Y2O3 nanoparticles, especially refined Zr-Y-O nanoparticles, act as He trap sites to suppress the formation and growth of He bubbles. Furthermore, the W-O-Y and W-O-Zr-Y nanoparticles increased the solubility of He and delayed He diffusion, hindering the formation of He bubbles.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 8
·4613-4621
·
IF 2.2
Wang Hongjun,Yang Shuning,Zeng Xiong,Chen Mengyao,Guo Zicong,Mi Pengtao,Zhou Jing,Zhu Yuanyuan
Low-dimensional yttrium oxide (Y 2 O 3 ) nanostructures have garnered significant research interest due to their intriguing properties arising from the dimensional effect and the modulation of the band structure. However, the simple preparation of Y 2 O 3 nanosheets is rarely investigated due to the inherent limitations posed by the counterpart bulk cubic or monoclinic crystal structure. Herein, the low-dimensional layered Y 2 O 3 nanosheets are prepared by a facile route of rapid heating followed by centrifugation, in which its corresponding hydrous-chloride compound is used as the sole reagent. The formation stages of layered Y 2 O 3 nanosheets and corresponding mechanisms are elucidated in detail. The x-ray diffraction results confirm that the intermediate product after rapid heating is yttrium oxychloride (YOCl), which converts to the single-phase Y 2 O 3 with a 2D layered phase after centrifugation. In addition, the obtained Y 2 O 3 nanosheets possess a direct optical bandgap of 5.49 eV, and thus may hold promise for use in electronic applications. This research provides a facile and low-cost method for the preparation of other low-dimensional nanosheets with similar structures. Graphical Abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Quanle Cheng,Ruoshan Lei,Huanping Wang,Xingjie Song,Denghao Li,Shilong Zhao
Cyan-emitting LEDs are critical for advanced solid-state lighting, yet conventional phosphor-converted devices face thermal and encapsulant issues. All-solid-state transparent ceramics are promising alternatives, but cyan-emitting ones remain largely unexplored. Herein, novel cyan-emitting Bi 3+ :Y 2 O 3 transparent ceramics were prepared via vacuum sintering. The samples exhibit a dense microstructure, high visible transmittance, strong UVC/UVB shielding, and excellent mechanical properties. Bi 3+ occupies C 2 and S 6 lattice sites, producing dominant cyan (495 nm, C 2 ) and weak violet (423 nm, S 6 ) emissions under 332 nm excitation. The two emissions show distinct thermal responses due to thermally activated energy transfer from C 2 to S 6 , and the sample retains 75% of its intensity at 373 K with stable cyan color. The ceramic-based LED exhibits bright cyan emission, eliminating the aging issues of phosphor-converted devices. This work demonstrates the potential of Bi 3+ : Y 2 O 3 transparent ceramics for cyan-emitting LEDs in low-light and medical applications, as well as UV-shielding windows.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Xu Cheng,Xiaobing Deng,Chao Yu,Hourui Cheng,Chengji Deng,Jun Ding,Feng Qian,Zhenglong Liu,Beiyue Ma,Zhoufu Wang,Hongxi Zhu
The present study explores the densification and mechanical properties of novel Al 4 O 4 C ceramics, which are enhanced by the incorporation of Y 2 O 3 additives and the utilization of spark plasma sintering. A significant observation was the presence of a native oxide layer on the surface of the Al 4 O 4 C powder, predominantly composed of Al 2 O 3 . Following sintering at 1723 K, Al 4 O 4 C was established as the primary phase, with Al 2 O 3 and Y 3 Al 5 O 12 (YAG) identified as secondary phases. Comprehensive experimental analysis, complemented by molecular dynamics simulations, revealed the mechanism of YAG on the grain growth behavior of Al 4 O 4 C. The findings demonstrated that an optimal Y 2 O 3 content of 3 wt% resulted in a maximum flexural strength of 272 MPa, a fracture toughness of 2.01 MPa·m 1/2 , and a Vickers hardness of 15.1 GPa. This research offers valuable insights into the densification process and the enhanced mechanical properties of ternary carbides, paving the way for their further applications.
✓ 已验证
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2025
·
IF 2.8
Ziwen Xia,Weiye Yang,Hongyan Peng,Shihua Zhao
A B S T R A C T Photocatalysis is gaining increasing attention due to its potential applications in various fields and simple, environmentally friendly production technologies. In this study, hollow pencil-like Y 2 O 3 was synthesized using a hydrothermal method, and Cu 2 O was coated onto the surface of Y 2 O 3 through a chemical precipitation method, resulting in a hollow pencil-like Y 2 O 3 /Cu 2 O composite heterojunction structure. The hollow pencil-like morphology provides a larger specific surface area, and the inherent band offset facilitates the spatial separation of photogenerated carriers. The Y 2 O 3 /Cu 2 O composite material was used as a catalyst to degrade methyl orange (MO) under xenon lamp irradiation, achieving a degradation efficiency of over 95% within 2 hours. After five cycles, the photocatalytic efficiency remained above 80%, indicating that the material exhibits high photocatalytic activity and good stability. Moreover, studies demonstrate that the Y 2 O 3 /Cu 2 O composite material exhibits superior photocatalytic efficiency compared to Cu 2 O particles, providing valuable insights for future research in related fields.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·Vol. 44
·期 5
·4967-4972
·
IF 2.986
Le Zhang,Zhigang Jiang,Qing Yao,Zhongying Wang,Yikun Zhang,Shuai Wei,Tianyuan Zhou,Yue Ben,Rong Sun,Hao Chen
Y 2 O 3 transparent ceramics were fabricated from precipitated powders prepared at different stirring speeds during the precipitation process. The influence of the stirring speed on the phase component of precursors, morphology of Y 2 O 3 powders and properties of fabricated ceramics were systematically investigated. Crystalline phase precursors of (NH 4 ) a Y(OH) b (CO 3 ) c ·H 2 O were prepared from 110 rpm, 220 rpm and 550 rpm respectively. But amorphous precursors of Y(CO 3 )(OH)·nH 2 O (n = 1–1.5) were observed when stirring speeds were 330 rpm and 440 rpm. Y 2 O 3 powders prepared from 440 rpm exhibited the lowest agglomeration and the smallest grain size, and the ceramics with the optimal transmittance was accordingly obtained. The results of computational fluid dynamics software CFX showed that a more homogeneous flow field distribution without local circulations could be produced at 440 rpm, which would be benefit for the optical quality of transparent ceramics. The study would provide a considerable reference for the controllable fabrication of well-dispersibility Y 2 O 3 powders and Y 2 O 3 transparent ceramics.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Weiqiang Hu,Zhi Dong,Hui Wang,Tansir Ahamad,Zongqing Ma
Oxide-dispersion-strengthened (ODS) tungsten based alloys with high performance were synthesized by optimized freeze-drying with PVP and PEG polymer dispersant additives and subsequent low temperature sintering . The pre-freezing principle developed firstly in our work shows that fast cooling rate and polymer dispersant additives contribute to the refinement and uniformity of precursor powders. The optimized freeze-dried W-Y 2 O 3 composite powders possess an average grain size of 9 nm, which can be attributed to the steric hindrance provided by polymer dispersants during freeze-drying and voids left by the decomposition of polymer dispersants during calcination . After sintering at low temperature, the W-Y 2 O 3 alloys have ultrafine W grain (210 nm) and nano second phase particles (<50 nm) dispersed in W matrix while maintaining a high relative density of 97.8%. These factors mentioned above lead to the microhardness and compressive strength as high as 721 ± 31 HV 0.2 , 814 MPa respectively, accompanied by a high total deformation plasticity of above 50%. These results indicate that the optimized freeze-drying and subsequent low temperature sintering is a promising way to fabricate ODS tungsten based alloys with high performance.
研究领域:
材料科学
·
金属学与冶金工程
·
纳米材料
·
复合材料
·
结构材料
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 37
·25273-25279
·
IF 3.3
Meng Ju,Hongkuan Yuan,Wenhao Ji,Lei Zhao,Yang Xiao,Yauyuen Yeung
Rare-earth thulium (Tm3+) doped yttrium oxide (Y2O3) host single crystals are promising “eye-safe” laser materials. However, the mechanisms of photoluminescence and energy transfer in Tm3+ doped Y2O3 crystals are not yet understood at the fundamental level. Here, we synthetize a series of Y2O3:Tm3+ samples by the sol–gel method. Our experimental results show that the most intensive absorption line of the 3H6 → 1D2 transition occurs at 358 nm, and the strongest emission line of the 1D2 → 3F4 transition is located at 453 nm, which are in good agreement with the calculations of 363 nm and 458 nm, respectively. By using the CALYPSO structural search method, the ground state structure of Y2O3:Tm3+ with P2 space group symmetry is uncovered. The complete energy levels, including free-ion LS terms and crystal-field LSJ multiplet manifolds, of Y2O3:Tm3+ are obtained based on our developed WEPMD method. The present findings show that our WEPMD method can be used in experiments to elucidate the underlying mechanisms of photoluminescence and energy transfer in Tm3+ doped Y2O3 crystals, which offer insights for further understanding of other rare-earth doped laser materials.
研究领域:
材料科学
·
光子学
·
激光物理
·
固态化学
·
计算材料科学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Dongjing Jiang,Zhi Dong,Zunfeng Du,Qian Zhao,Hui Wang,Zongqing Ma
It is an effective way to enhance the mechanical properties of Mo alloy by adding oxide strengthening phase. However, the oxide second-phase particles in oxide dispersion strengthened Mo (ODS-Mo) alloy prepared via traditional mechanical alloying generally coarsen at grain boundaries (GBs), greatly weakening their strengthening effect . To solve this problem, single and multiple oxide particles strengthened Mo alloys are developed via wet chemical method and subsequent low-temperature sintering in this work. After doping CeO 2 , the compressive yield strength (340.3 ± 8.1 MPa) and hardness (410 ± 13 HV) of Mo–Y 2 O 3 (Mo–Y) alloy were decreased by 17.9% and 22.7%, respectively. However, after doping La 2 O 3 , the compressive yield strength and hardness of Mo–Y alloy are further increased by 89.4% and 21.0%, respectively. According to microstructure observation and theoretical calculation, CeO 2 doping decreases the volume fraction of intergranular oxide particles and weakens interfacial drag force, finally promoting Mo grain growth and worsening the mechanical properties of Mo–Y alloy. In contrast, after doping La 2 O 3 , more oxide particles are dispersed at GBs, and their coarsening are inhibited. This results in a stronger Zener force. Moreover, interfacial drag force can also be increased through doping La 2 O 3 . Two forces synergistically hinder GBs migration. Therefore, La 2 O 3 doping leads to Mo grain refinement and ultimately enhances the mechanical properties of Mo–Y alloy. These results in our work can provide theoretical guidance for choosing proper oxide dopants to prepare ODS alloys with excellent mechanical properties.
研究领域:
材料科学
·
金属学与热处理
·
结构材料
·
粉末冶金
·
固态相变
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 11
·2012-2019
·
IF 3.85
Hu Weiqiang,Gong Fengming,Liu Shaocun,Tan Jing,Chen Songhua,Wang Hui,Ma Zongqing
The oxide dispersion strengthened Mo alloys (ODS-Mo) prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries (GBs), which obviously suppress the corresponding strengthening effect of oxide addition. In this work, the Y 2 O 3 and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering. Accompanied by TiC addition, the Mo−Y 2 O 3 grains are sharply refined from 3.12 to 1.36 µm. In particular, Y 2 O 3 and TiC can form smaller Y−Ti−O−C quaternary phase particles (∼230 nm) at Mo GBs compared to single Y 2 O 3 particles (∼120 nm), so as to these new formed Y−Ti−O−C particles can more effectively pin and hinder GBs movement. In addition to Y−Ti−O−C particles at GBs, Y 2 O 3 , TiO x , and TiC x nanoparticles (<100 nm) also exist within Mo grains, which is significantly different from traditional ODS-Mo. The appearance of TiO x phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase, thus strengthening and purifying Mo matrix. Furthermore, the pure Mo, Mo−Y 2 O 3 , and Mo−Y 2 O 3 −TiC alloys have similar relative densities (97.4%–98.0%). More importantly, the Mo−Y 2 O 3 −TiC alloys exhibit higher hardness (HV 0.2 (425 ± 25)) compared to Mo−Y 2 O 3 alloys (HV 0.2 (370 ± 25)). This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.
研究领域:
材料科学
·
金属合金制备
·
微观结构调控
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）