CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yongjie Xie,Le Sun,Fei Ying,Gaoyang Fang,Zhanhui He,Wu Lei,Qingli Hao,Xingen Xie
Aluminum nitride (AlN) ceramics are widely used in electronic packaging due to their high thermal conductivity. However, AlN ceramics typically exhibit high reflectance in the visible to near-infrared region, thereby limiting their application in high-power optoelectronic integrated packaging. To address this, black AlN ceramics were fabricated in this study via tape casting and pressureless sintering, using MoO 3 as a coloring agent and Y 2 O 3 as a sintering additive. Mechanistically, Y 2 O 3 promotes densification of the AlN ceramic structure through liquid-phase sintering via the formation of YAlO 3 (YAP), which suppresses phonon scattering and thus enhances thermal conduction. MoO 3 decomposes to form fine and isolated Mo second phase particles that precipitate at triple grain boundaries, exerting a pinning effect that promotes grain refinement and improves the flexural strength of the AlN ceramics. The Mo second phase reduces broadband reflectance through free carrier response and multiple scattering. Density functional theory (DFT) calculations reveal that the solid solution of multivalent Mo and the formation of charge compensating defects introduce defect energy levels within the bandgap. The synergistic effect of these mechanisms enables the black coloration of AlN ceramics. The results show that at a sintering temperature of 1800 °C and a MoO 3 doping content of 1.5 wt%, the black AlN ceramics achieve a thermal conductivity of 173.2 W·m −1 ·K −1 , a flexural strength of 471.8 ± 10.2 MPa, a L value of 42.37, and a reflectance below 15 % in the visible and near-infrared regions.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 30
·64796-64804
·
IF 5.6
Zhenghuang Quan,Zhoufu Wang,Hao Liu,Yan Ma,Shen Zhou,Pingtao Fang,Chao Shu
Yttrium oxide is widely recognized as a critical refractory material for superalloy purification smelting, owing to its high melting point, excellent vacuum chemical stability, and low alloy wettability. However, its inherent brittleness and high thermal expansion coefficient lead to poor thermal shock resistance, which severely restricts its practical industrial applications. To address this limitation, this study utilized La 3+ /Nb 5+ co-doping to fabricate Y 2 O 3 -based composites and systematically investigated their phase structure, microstructure, and overall properties. XRD Rietveld refinement and density functional theory (DFT)-based first-principles simulations confirmed that La 3+ preferentially substitutes Y 3+ at the Y1 lattice site, while Nb 5+ occupies the Y2 site, inducing significant lattice distortion and generating cation vacancies for charge balance. Microstructural observations revealed that co-doping triggers bimodal grain growth-characterized by small, loosely bonded grains with low Nb 5+ content and large grains containing intergranular pores attributed to high Nb 5+ substitution-resulting in increased apparent porosity but enhanced material toughness. Mechanical and thermal shock tests showed that while room-temperature flexural strength decreases, thermal shock resistance is drastically improved. When the La 3+ /Nb 5+ co-doping molar ratio was Y 2 O 3 : La 2 O 3 : Nb 2 O 5 = 1:0.050:0.050 (corresponding to the YLN10 sample), the composite exhibited the optimal overall performance: its room-temperature flexural strength reached 45.57 MPa, residual strength retention after thermal shock was 58.43 %, and elastic modulus retention was 87.91 %, effectively balancing mechanical properties and thermal shock stability. These improvements are primarily attributed to pore-mediated thermal stress dissipation and crack deflection effects. This work demonstrates that La 3+ /Nb 5+ co-doping is an effective strategy to balance the mechanical rigidity and thermal shock stability of Y 2 O 3 , providing a valuable reference for optimizing refractory materials for high-temperature superalloy smelting.
研究领域:
材料科学
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无机非金属材料
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高温功能陶瓷
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固态化学
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计算材料学
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产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2025
·
IF 3.5
Yongning Han,Wenying Zhou,Jian Li,Zhuoqun Han,Lunan Bi,Zheng Zhang,Yang Wang,Ling Li,Degang Zhao
Silicon nitride (Si₃N₄) ceramics exhibit excellent mechanical properties and biocompatibility, making them highly suitable for biomedical applications, particularly in implants. In this study, the mechanical properties and bioactivity of Si₃N₄ ceramics with varying amounts of Y₂O₃-Al₂O₃-SiO₂ sintering aids were investigated. Increasing the sintering additive content from 4 wt% to 8 wt% substantially improved the bulk density of the ceramics, leading to notable enhancements in mechanical properties. These included a Vickers hardness increase to 10.07 GPa, a flexural strength increase to 605 MPa, and a fracture toughness increase to 2.43 MPa m 1/2 . The optimal combination of mechanical properties was achieved with 8 wt% sintering additives due to the higher aspect ratio and lower porosity. After immersion in simulated body fluid (SBF), the surface of the Si₃N₄ ceramics was coated with a Ca and P-rich layer, morphologically similar to hydroxyapatite. The layer formation was facilitated by the presence of SiO₂, which promoted hydroxyapatite nucleation and growth, as well as the rapid release of Ca 2 ⁺ ions and the sustained stability of the apatite layer.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Xiao-Yu Zhang,Wen-Lin Li,Zhi-Hao Ma,Sheng Li,Wei-Wei Yan,Li Li,Xing-Shun Cong,Xian-Yong Wei,Zhi-Xin Li
The reverse water-gas shift (RWGS) reaction represents a critical pathway for CO 2 valorization into syngas for Fischer-Tropsch synthesis and renewable energy storage. Although Co-based catalysts offer an economical and efficient solution, their application is affected by CO 2 methanation reaction and carbon deposition, resulting in limitations that are difficult to balance between activity, selectivity and stability. This work provides an effective approach to enhance the RWGS reaction performance over Co-based supported catalysts through Y 2 O 3 morphology engineering (nanoplates/NP, nanorods/NR, nanospheres/NS). Remarkably, Co/Y 2 O 3 -NR catalyst demonstrates exceptional, CO 2 conversion (57.1 %), CO selectivity (99.3 %) and stability compared to Co/Y 2 O 3 -NP and Co/Y 2 O 3 -NS catalysts at 600 °C. Systematic characterization reveals that Y 2 O 3 -NR exhibits optimal Co dispersion, moderate metal-support interaction and preferential CO 2 adsorption, resulting in its outstanding catalytic activity. Crucially, spatially segregated carbon deposition preserves active sites across Co/Y 2 O 3 catalysts, enhancing the catalytic stability. These findings establish Y 2 O 3 morphology engineering as an exemplary support material and provide mechanistic insights for designing high-performance Co-based supported catalysts in RWGS reaction via morphological engineering.
研究领域:
催化化学
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材料科学
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化学工程
·
能量转换
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环境化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.6
Guoqiang Wang,Lihua Guo,Feng Zhang,Luqiao Yang,Jun Lin
Tungsten (W)-based cermet fuels have garnered significant interest in nuclear thermal propulsion (NTP) systems due to their high melting point, thermal properties, and compatibility with hydrogen (H 2 ) propellants. The W–Y 2 O 3 composite matrix prepared by spark plasma sintering (SPS) exhibits greater densification and suppressed grain growth compared to pure W. Since NTP systems operate at temperatures above 2300 °C, the microstructural evolution under elevated temperatures is crucial to fuel performance. This study investigates the high temperature effects on the microstructure of pure W and W–Y 2 O 3 matrices fabricated by SPS. The matrices were subjected to temperatures ranging from 1800 °C to 2300 °C. Below 2300 °C, Y 2 O 3 particles effectively inhibited W grain growth through the Zener pinning effect, thereby increasing the proportion of low-angle grain boundaries (LAGBs). At high temperatures, H₂ diffuses into the matrix, reacting with uranium dioxide (UO 2 ), which contributes to fuel loss. The fine grains increase grain boundary density, extending H₂ diffusion paths, while LAGBs help mitigate harmful H₂ accumulation. However, at 2300 °C, W diffuses into Y 2 O 3 , causing the Y 2 O 3 grains to grow and leading to the formation of pores and cracks. This weakens the Zener pinning effect, promoting abnormal grain growth of W, which ultimately results in an increase in high-angle grain boundaries (HAGBs) and accelerates the diffusion of H 2 . The study identifies three stages of W diffusion into Y 2 O 3 : initial enrichment at Y 2 O 3 grain boundaries, formation of W-depleted/W-enriched island-like structures within Y 2 O 3 grains, and the formation of a Y 6 WO 12 core-Y 2 O 3 shell structure at 2300 °C, providing valuable insights for optimizing Y 2 O 3 composites for NTP applications.
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DOI
高影响因子
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
·
2022
·
IF 1.279
Tao Li,Hongjun Kang,Songtao Lu,Wei Qin,Xiaohong Wu
As space exploration moves further and further into deep space, it is a big challenge to develop antistatic inorganic thermal control coating with lightweight and strong adhesion to substrates. Herein, this work reported an inorganic antistatic AZO/Al 2 O 3 -ZnO-Y 2 O 3 composite coating fabricated by PEO combined with ALD methods. The results show that when the Zn/Al ratio of deposited AZO film is 24:1, its overall performance is the optimal, and the emissivity, absorptivity and resistivity are 0.892, 0.409 and 1.15 × 10 –3 Ω·cm, respectively, which can meet thermal control application requirements of spacecraft. Furthermore, the AZO/Al 2 O 3 -ZnO-Y 2 O 3 composite coating shows a good electron-resistance irradiation performance, which is because AZO conductive film is easy to generate free carriers, speed up some electron transport and make electrons better disperse and conduct, thus reducing the penetration depth of electron irradiation. This work provides a material basis for thermal control system of spacecraft with long life and high reliability.
研究领域:
材料科学
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航天工程
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产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2023
·Vol. 220
·期 13
·2300087
·
IF 2
Zhou Zou,Dengwei Zhang,Arun Murali,Chaoyi Chen,Li Liu,Yuanpei Lan,Junshan Zhang,Fengyuan Liu,Zhiyao Chu,Deyang Ning,Junqi Li
Herein, size-controllable spherical yttrium carbonate powders with D 50 in range from 225 to 743 nm are synthesized from Y(NO 3 ) 3 ·6H 2 O and urea. With the rise of the concentration ratio of urea/Y 3+ , temperature, and extension of aging time, diameter of yttrium carbonate spheres increases. When the urea/Y 3+ is 40: 1 and ages for 4 h at 90 °C, the D 50 of synthesized powder, which has been determined as Y(OH)CO 3 ·1.3H 2 O, has the largest D 50 of 743 nm with (D 90 –D 10 )/2D 50 of 0.22. After decomposition, the D 50 of formed Y 2 O 3 decreases to 632 nm, the (D 90 –D 10 )/2D 50 is 0.24, and the D 50 of Y 2 O 3 is in the range of 126–632 nm. Then, 6 mol. % Eu 3+ is homogeneously doped into Y(OH)CO 3 ·1.3H 2 O and Y 2 O 3 : Eu 3+ spherical powder is obtained after roasting, which exhibits a strong emission peak at 613 nm. The developed synthetic method and the obtained size-controllable spherical Y(OH)CO 3 ·1.3H 2 O, Y 2 O 3 , and Y 2 O 3 : Eu 3+ with a uniform size distribution own various potential applications.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 11
·14746-14754
·
IF 5.6
Boyu Chen,Lijuan Niu,Jianlong Chai,Zhiyuan Bai,Jiayin Zhang,Di Liu,Xuefeng Lu,Yabin Zhu
β-SiC ceramics were prepared by spark plasma sintering at 2200 °C with Y 2 O 3 , MgO , and CeO 2 as sintering additives. Al 2 O 3 was doped based on the above oxides to form a two-component sintering additive to carry out a comparative analysis. The effects of these additives on the microstructure, bulk density, and Vickers hardness of β-SiC were systematically studied. The mechanical properties of the single-component samples were superior to those of the two-component samples. Notably, the single-component sample with Y 2 O 3 , addition exhibited the highest density (98.69 %) and hardness (27.1 GPa), which can be attributed to the appropriate growth of the grains in the single-component sample with Y 2 O 3 . Additionally, the principle of lattice reduction in SiC ceramics was explored using first-principle calculations, further highlighting the advantage of Y 2 O 3 as a single additive for the high-temperature sintering of SiC ceramics.
研究领域:
材料科学
·
陶瓷学
·
力学性能
·
计算材料学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yaowu Wei,Xiujuan Wang,Yuan Chen,Wenguo Zhang,Junfeng Chen
The effect of Ca(OH) 2 and Zr(OH) 4 on the sintering behavior and thermal shock resistance of Y 2 O 3 ceramics were investigated in this study. The results showed that Ca(OH) 2 enhanced the densification of Y 2 O 3 ceramics. CaO generated from the decomposition of Ca(OH) 2 reacted with Y 2 O 3 to form a solid solution. The substitution of Ca 2 + for Y 3+ created V O ∙ ∙ that facilitated substance migration and pore elimination. Conversely, the introduction of Zr(OH) 4 exerted an adverse effect on the sintering. ZrO 2 produced by the decomposition of Zr(OH) 4 formed a solid solution with Y 2 O 3 which inhibited the sintering of Y 2 O 3 ceramics, where Zr 4+ primarily enhanced lattice stability rather than promoting sintering. The O i ′ ′ created by the substitution of Zr 4+ for Y 3+ reduced cation diffusion and hindered grain boundary migration. The mechanisms by which two types of additives affect the thermal shock stability of Y 2 O 3 ceramics are different. The Zr(OH) 4 -doped ceramics demonstrated better thermal shock resistance owing to their higher porosity, which changed energy release pathway and increased the resistance to crack propagation. In comparison, the improvement in the Ca(OH) 2 -doped ceramics mainly originated from the enhanced mechanical properties, which would suppressed crack initiation and delayed failure under thermal stress.
研究领域:
材料科学
·
陶瓷
·
热学性能
·
烧结技术
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产品关联
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
·
光电子学
·
陶瓷与玻璃
·
固态照明
·
热管理
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DOI
高影响因子
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yihang Dong,Xiangnan Wang,Ye Han,Shuyu Yao
{(ZrO 2 ) 0.92 (Y 2 O 3 ) 0.08 } 1- x (CuO) x (ZYC) synthesized by the co-precipitation method with different stoichiometry ( x =0, 0.1, 0.2 and 0.3) are evaluated through thermogravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD) and electrical conductivity using an electrochemical workstation and the effects of CuO doping content on the above properties are researched, respectively. The results are discussed in terms of the potential as diffusion barrier material to be applied in diffusion barrier limiting current oxygen sensors application at temperatures from 500 to 850 °C. Results derived from TG-DSC shows that the weight loss of the sample is mainly due to the decomposition of the precursor, forming ZYC above ~600 °C. XRD analysis shows that the ZYC sample is a cubic phase and the CuO doping is benefit to the crystallinity of ZYC. The electrical conductivity results indicate that the total conductivity decreases for ZYC1 but then increases with the increase of CuO doping content and reaches the maximum total conductivity of 2.02 × 10 −1 S cm −1 at 850 °C and the activation energy ( E a ) is 0.93 eV for ZYC3.
研究领域:
材料科学
·
化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）