JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Weiqiang Hu,Tao Sun,Chenxi Liu,Liming Yu,Tansir Ahamad,Zongqing Ma
The ultrafine Mo-Y 2 O 3 composite powders were successfully synthesized by innovative freeze-drying method. Consequently, the freeze-dried Mo-Y 2 O 3 composite powders with high sintering activities possess an average grain size of 54 nm. After low temperature sintering at 1600 °C, the Mo-Y 2 O 3 alloys maintaining a high density (99.6 %) have the finest grain size (620 nm) comparing with available literature about oxide dispersion strengthened molybdenum alloy (ODS-Mo). The oxide particles remain their small size (mainly <50 nm) within Mo grains and at Mo grain boundaries. Furthermore, the Y 5 Mo 2 O 12 particles were firstly observed within Mo matrix, and its formation can absorb nearby oxygen impurities, which involves the purification of Mo matrix. The mechanical properties show that Mo-Y 2 O 3 alloy possess a high hardness of 487 ± 28 HV 0.2 , a high yield strength of 902 MPa, a high compressive strength of 1110 MPa, respectively. Our work suggests that freeze-drying and subsequent low temperature sintering can shed light on the preparation of ultrafine ODS-Mo alloys with high performance.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Qiang-Qiang Zhu,Peng-Fei Yang,Zai-Yang Wang,Peng-Cheng Hu
To obtain red-emitting luminescent material for high-power UV LED and UV LD applications, an additive-free Y 2 O 3 :Eu 3+ phosphor ceramic was successfully prepared in this work. The nitrate pyrogenation method is applied to obtain raw nanopowders with high reactivity, and a hybrid sintering method combining low-temperature presintering and subsequent hot isostatic pressing (HIP) is then applied to realize full densification of the final ceramic products. The effects of the presintering temperature on the density, microstructural, and optical properties are investigated in detail. The HIP-treated Y 2 O 3 :Eu 3+ ceramic presintered at 1450 °C exhibits a high transmittance near 80 % at 600 nm. Due to the nonuse of sintering additives, the thermal conductivity of Y 2 O 3 :Eu 3+ ceramic product reaches 10.9 Wm −1 K −1 at room temperature. The achieved Y 2 O 3 :Eu 3+ ceramic also exhibits good applicability under the excitation of a UV LED chip and UV laser light, showing promise as a color converter for high-power UV LED and UV LD applications.
研究领域:
材料科学
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光电子学
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陶瓷与玻璃
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固态照明
·
热管理
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Zhenpan Chen,Huibin Liu,Jie Cai,Gexing Meng,Liqin Zeng,Cen Zhang,Fangfang Zhao,Kuiyi You,He’an Luo
Chemical looping technology offers promising opportunities for converting CO 2 /H 2 O to high value-added products (e.g., CO, H 2 , and C 2 H 2 ) by using well designed metal oxides as oxygen carriers. Herein, the calcium oxide (CaO) was used as oxygen carrier to synthesize acetylene (C 2 H 2 ) from inorganic carbon material (e.g., active carbon (AC)) and H 2 O via chemical looping route, which is constituted by two basic steps: solid-phase synthesis of calcium carbide (CaC 2 ) (redox reaction) and C 2 H 2 production (metathesis reaction). To further enhance the energy utilization efficiency of this chemical looping process, transition metal oxides (ZrO 2 , La 2 O 3 , and Y 2 O 3 )-based catalysts were used to promote the solid-phase redox reaction between CaO and carbon reactants. Compared with blank test, 5 wt% cubic Y 2 O 3 as a catalyst that added into CaO-AC mixture can further increase the CaO conversion by ∼40% under optimal conditions and the onset solid-phase reaction temperature between CaO and AC decreases to ∼1620 °C. This catalytic effect is ascribed to the enhanced chemical reaction at the solid–solid interface of CaO and AC reactants and promoted ionic conductivity (e.g., Ca 2+ , O 2– conduction) of the bulk after adding Y 2 O 3 catalyst, leading to a decreased average apparent activation energy ( E a ) (∼909 kJ mol −1 ) of CaC 2 formation. Our work demonstrates that constructing of catalytic solid-phase reaction system by adding selected transition metal oxides as catalysts can effectively reduce the E a of solid-phase CaC 2 synthesis and enhance the overall efficiency of chemical looping synthesis of C 2 H 2 , which sheds light to synthesize organic compounds from inorganic materials in large scale.
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DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2026
·
IF 7.9
Wei Zhao,Linran Huang,Jun Wang,Kaiqi Zou,Yuhang Zhao,Yong Cao,Kunhao Feng,Wei Li,Chao Cai,Qingsong Wei
Porous Y 2 O 3 ceramics are considered promising materials for applications such as titanium-alloy precision casting due to their high chemical compatibility with reactive Ti melts. Conventional binder-jetted Y 2 O 3 , however, suffers from poor sintering, high initial porosity, and inter-layer connected defects. In this study, an aqueous binder was used as an active carrier for the localized introduction of nano-CaTiO 3 sintering activators into the printed regions during binder jetting. Nano-CaTiO 3 -modified binders were prepared by two-step ball-milling, dilution, and sequential filtration, and their stability, rheology, jetting, and wetting behavior were evaluated. Binders with 3–9 wt% nano-CaTiO 3 enabled stable piezoelectric jetting and powder-bed penetration. After sintering at 1600 °C, open porosity decreased from 51.15% to 35.43%, flexural strength increased from 11.36 to 28.19 MPa, and roughness decreased from 10.66 to 5.42 μm. XRD and SEM–EDS support the formation of Ti-containing interfacial reaction products, while XPS indicates changes in the local chemical environment. Ca-related defect modification is proposed as a possible contribution.
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产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
X.Y. Ping,B. Meng,W.K. Liang,Q. Zheng,C. Li
The Ce 0.85 Y 0.15 O 2-δ (YDC)-xmol% aluminum containing compound (x = 0, 10, 20 and 40) composite powders were prepared through mixing YDC with 0, 10, 20 and 40 mol% Al(NO 3 ) 3 (named as A0, A10, A20, A40), and then densified by spark plasma sintering at 1300 °C for 5 min. The main phase of YDC exists in all samples, while a second phase of CeAlO 3 forms for x ≥ 10 in the composite ceramics. The diffraction peak intensity of CeAlO 3 gradually augments with the increase of Al(NO 3 ) 3 addition amount. The average grain size of the composite ceramics reduces from 1.7 μm to 0.34 μm with the rise in Al(NO 3 ) 3 addition amount from 0 to 40%. The grain boundary (GB) electrical conductivity of A10 and A20 is lowered by 96% and 89% compared with that of YDC at 350 °C because the CeAlO 3 phase exists in the form of flakes and fine grains and hinders the oxygen ion conduction across the GB of samples. When CeAlO 3 grains grow up and uniformly distribute in the A40, the GB conductivity of A40 increases by 405% relative to that of pure YDC at 350 °C.
研究领域:
材料科学
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陶瓷
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固态离子学
·
能源材料
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Zhongying Wang,Le Zhang,Hao Yang,Jian Zhang,Lixi Wang,Qitu Zhang
High optical quality Y 2 O 3 transparent ceramics with fine grain size were successfully fabricated by air pre-sintering at various temperature ranging from 1500 to 1600 °C combined with a post-hot-isostatic pressing (HIP) treatment using co-precipitated powders as the starting material. The fully dense Y 2 O 3 transparent ceramic with highest transparency was obtained by pre-sintered at 1550 °C for 4 h in air and post-HIPed at 1600 °C for 3 h (the pressure of HIP 200 MPa), and it had fine microstructure and the average grain size was 0.96 μm. In addition, the in-line transmittance of the ceramic reached 81.7% at 1064 nm (1 mm thickness). By this approach, the transparent Y 2 O 3 ceramics with fine grain size (<1.6 μm) were elaborated without any sintering aid.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jinpeng Li,Muhammad Yousaf,Muhammad Akbar,Enyi Hu,Asma Noor,MAK Yousaf Shah,Naveed Mushtaq,Yuzheng Lu,Majid Niaz Akhtar,Jun Xie
The high-performance single-phase semiconductor materials with higher ionic conductivity have drawn substantial attention in fuel cell applications. Semiconductor materials play a key role to enhance ionic conductivity subsequently promoting low temperature solid oxide fuel cell (LT-SOFC) research. Herein, we proposed a semiconductor Co doped Y 2 O 3 (YCO) samples with different molar ratios, which may easily access the high ionic conductivity and electrochemical performances at low operating temperatures. The resulting fabricated fuel cell 10% Co doped Y 2 O 3 (YCO-10) device exhibits high ionic conductivity of ∼0.16 S cm −1 and a feasible peak power density of 856 mW cm −2 along with 1.09 OCV at 530 °C under H 2 /air conditions. The electrochemical impedance spectroscopy (EIS) reveals that YCO-10 electrolyte based SOFC device delivers the least ohmic resistance of 0.11–0.16 Ω cm 2 at 530-450 °C. Electrode polarization resistance of the constructed fuel cell device noticed from 0.59 Ω cm 2 to 0.28 Ω cm 2 in H 2 /air environment at different elevated temperatures (450 °C to 530 °C). This work suggests that YCO-10 can be a promising alternative electrolyte, owing to its high fuel cell performance and enhanced ionic conductivity for LT-SOFC.
研究领域:
材料科学
·
能源工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shuai Hu,Maohui Yuan,Hanchang Huang,Changqing Song,Kai Han,Wenda Cui,Zining Yang,Hongyan Wang
Flame aerosol synthesis (FAS) is an excellent strategy for continuous, fast, and mass production of small-size upconversion nanoparticles (UCNPs), which have high potential applications in fields like biological imaging, colour display and optical temperature sensing. However, flame-made UCNPs have received less attention, and relevant studies are limited. Herein, for the first time, we successfully fabricated cerium (Ce)-doped homogeneous ultrasmall Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs using a liquid-fed FAS method. Ce was doped to improve the upconversion luminescence (UCL) of the Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs. The overall UCL intensity was enhanced ∼77.9-fold for an optimal concentration of 20 mol% Ce-doped UCNPs, compared with the UCNPs without Ce doping with a relatively homogeneous ultrasmall size of 8–10 nm. Further studies confirmed that both trivalent (Ce 3+ ) and tetravalent (Ce 4+ ) simultaneously exist in the Y 2 O 3 hosts and are critical in enhancing the UCL properties. In addition, the fluorescence intensity ratio (FIR) method was used to evaluate the thermal properties of the fabricated UCNPs. Ce doping significantly improved the thermal sensitivity of Y 2 O 3 :Yb 3+ /Ho 3+ UCNPs. An excellent relative sensitivity ( S R ) of 0.622% K −1 at 598 K was obtained for flame-made UCNPs doped with 20 mol% Ce.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 23
·5830
·
IF 3.1
Qing Qin,Lin Han,Gang Xiong,Zihan Guo,Junwei Huang,Yujuan Zhang,Zhen Shen,Changchun Ge
Digital light processing (DLP) 3D-printed Si₃N₄ ceramics, known for their exceptional performance, offer distinct advantages in meeting the high-strength and complex structural demands of industries such as aerospace, semiconductors, healthcare, automotive, energy, and machinery. However, due to Si₃N₄’s strong chemical stability, low diffusion rate, low self-sintering ability, and high melting point, achieving densification under conventional sintering conditions is challenging. As a result, sintering additives are essential to promote the sintering process, lower the sintering temperature, improve densification, and enhance performance. In this study, 45 vol% Si₃N₄ slurries were prepared using DLP 3D printing technology, incorporating nine different combinations of sintering additives, including aluminum oxide (Al2O3), yttrium oxide (Y2O3), and aluminum nitride (AlN), in various ratios with Si3N4. The slurries were then sintered at 1800 °C for 2 h under a 1 MPa N2atmosphere. Additionally, the phase composition, microstructure, grain distribution, and crack propagation of the materials. The results showed that a Si3N4to Al2O3and Y2O3ratio of 95:2.5:2.5 produced elongated β-Si3N4grain structures and enhanced density, achieving a maximum Vickers hardness of 12.88 ± 0.52 GPa. Additionally, the synergistic toughening effect of the rod-like β-Si3N4grains and sintering aids significantly improved the fracture toughness of the Si3N4ceramic matrix, with a flexural strength of 540.63 ± 10.05 MPa and a fracture toughness of 4.92 ± 0.07 MPa·m1/2. This study lays the foundation for the future application of 3D-printed Si3N4ceramics, optimization of sintering aid combinations at different ratios, and performance enhancement in extreme environments.
研究领域:
材料科学
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陶瓷工程
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增材制造
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机械工程
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产品关联
DOI
PubMed
高影响因子
Journal of Central South University
·
2026
·
IF 4.7
Jiang Hao-li,Yang Ya-ting,Lu Yu-gen,Yang Jia-mian,Sun Guo-quan,Cui Hong-zhi,Min Fan-lu,Wang Cong-xu,Xu Chuan-hua,Li Gai-ye,Zhang Jian-feng
Coarse-grained WC-10Co cemented carbides are indispensable for demanding applications such as rock drilling and shield tunneling, yet their development is restricted by poor mixing uniformity and the inherent hardness-toughness trade-off. To address this issue, a series of coarse-grained WC-10Co cemented carbides was developed by systematically tuning the ratios of La 2 O 3 and Y 2 O 3 additives via a co-precipitation and hydrogen reduction. The microstructures and mechanical properties were highly sensitive to this ratio. The optimal balance was achieved at a La: Y atomic ratio of 1:2, yielding a hardness of 86.6 HRA, a bending strength of 2201 MPa, and a remarkable fracture toughness of 25.72 MPa·m 1/2 . This improvement is mainly attributed to a synergistic interface-pinning mechanism. Specifically, trapezoidal La 2 O 3 and spherical Y 2 O 3 particles preferentially segregate at the WC/Co phase boundaries, thereby inhibiting abnormal WC grain growth and suppressing the martensitic transformation of ductile face-centered cubic cobalt (Co FCC ). Consequently, optimizing the additive ratio effectively alleviated the hardness-toughness trade-off, providing an effective paradigm for tailoring high-performance cemented carbides through precise powder-mixing engineering.
The alternative text for this image may have been generated using AI.
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DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2020
·
IF 4.652
Zhi Dong,Zongqing Ma,Ji Dong,Chong Li,Liming Yu,Chenxi Liu,Yongchang Liu
Oxide dispersion strengthened tungsten (ODS-W) alloys are a class of important materials that widely used for high temperature applications due to their unique physical and mechanical properties. However, the insufficient ductility of ODS-W alloys at low or high temperatures limits their widespread application, especially as structural materials. It is always a great challenge to efficiently disperse oxide second phase nanoparticles within W matrix for achieving ODS-W alloy with excellent balance of strength and ductility. Here we report an innovative strategy for the fabrication of high-performance ODS-W alloy with strength of up to 1134 MPa and total elongation over 30% at 700 °C. The innovative route involves the preparation of W–Y 2 O 3 composite powder precursor via alkaline hydrothermal method and subsequent low-temperature sintering in hydrogen atmosphere. The internal flake structure with uniformly dispersed Y component and external coating of W component on this flake structure can be formed in alkaline hydrothermal product and then be passed on to the reduced W–Y 2 O 3 composite nanopowders . As a result, the distribution of second phase oxide particles in the low-temperature sintered alloys using these composite nanopowders as precursor is optimized significantly including an increase in the volume fraction of intragranular oxide particles and a decrease in the size of both intergranular and intragranular oxide particles. Besides, the average W grain size is also refined dramatically (410 nm). More importantly, the intragranular oxide particle / W matrix interface is regulated to be coherent relationship. The combined action of these microstructural factors is responsible for the significantly enhanced strength and ductility of ODS-W alloy. These results indicate that the newly developed alkaline hydrothermal method in our work is a promising way to fabricate high performance ODS tungsten based alloys.
研究领域:
材料科学
·
机械工程
·
纳米材料
·
冶金学
·
高温材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yongshuai Xie,Fengqiong Xie,Lin Wang,Ying Peng,Dehua Ma,Luyi Zhu,Guilin Zhou,Xinqiang Wang,Guanghui Zhang
Dry reforming of CH 4 with CO 2 is an effective way to convert these two greenhouse gases into useful industrial feedstock . Here, we designed and developed Ni@Y 2 O 3 nanofibers catalyst by pyrolyzing sheet-like Ni 2 (CO 3 ) (OH) 2 grown in situ on the surface of Y 2 O 3 nanofibers. Y 2 O 3 nanofibers support can not only promote the contact of the reaction gas with the catalyst due to its self-supporting effect, but also improve the ability to capture CO 2 because of its basic oxide properties. Meanwhile, the oxygen exchange between the catalyst and CO 2 could promote the oxidation of carbon deposits , and further improve activity and stability of the catalyst. Besides, the catalyst obtained by low-temperature pyrolysis could maintain the sheet-structure of nickel on the surface of support, which is conducive to improve its catalytic activity , stability, and resistance to carbon deposition . This work has a positive effect on improving the design of catalysts as well as producing industrial chemicals and reducing the environmental pollution.
研究领域:
化学工程
·
环境科学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）