JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Binwei Huang,Pingzhan Si,Quanxing Ren,Zhuang Qian,Ziqiang Yin,Zhengren Huang,Qing Huang,Yinsheng Li
SiC ceramic was fabricated by spark plasma sintering of β-SiC powder and Y 2 O 3 -MgO additives in argon. The effects of β→α phase transformation of SiC on microstructure and thermal conductivity of densified bulks were systematically investigated, in comparison to the counterparts using α-SiC as starting powder. The β→α phase transformation led to a “unimodal to bimodal” transition in grain size distribution. After sintering at 1850 o C, the incomplete β→α phase transformation induced the appearance of β/α heterophase boundary with strong effect of phonon-scattering. After sintering at 2050 o C, the completion of β→α phase transformation resulted in enlarged grains and disappearance of β/α heterophase boundary in SiC ceramic. The lattice oxygen content was decreased primarily by enhanced grain growth and oxygen picking-up of sintering additives, and possibly some contribution from β→α phase transformation. The optimized microstructure enabled SiC ceramic to obtain a remarkable increase in thermal conductivity from 126 to 204 W/mK after the replacement of α-SiC by β-SiC as starting powder and the accomplishment of β→α phase transformation.
研究领域:
材料科学
·
热物理
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Yihang Dong,Zhaoyang Liu,Guoxing Qiu,Lipeng Pang,Ye Han,Shuyu Yao,Jianxu Ding,Xiangnan Wang
{(ZrO 2 ) 0.92 (Y 2 O 3 ) 0.08 } 1- x (Cr 2 O 3 ) x solid solution is composed by co-precipitation method and the effects of Cr 2 O 3 content on thermal analysis, crystal structure, microstructure and electrical conductivity are researched. The results discuss the potential for application as a diffusion barrier material at temperatures between 600 and 850 °C to the limiting current oxygen sensors. TG and DSC results show that the main weight loss and heat absorption processes occur below 600 °C and the {(ZrO 2 ) 0.92 (Y 2 O 3 ) 0.08 } 1- x (Cr 2 O 3 ) x solid solution is obtained above 600 °C. XRD analysis shows that the solid solution is fluorite type cubic phase and the solubility of Cr 2 O 3 in (ZrO 2 ) 0.92 (Y 2 O 3 ) 0.08 is less than 0.10. The SEM-EDS results show that the grain size of the sintered body decreases with increasing Cr 2 O 3 content and distribution of each element is uniform. The conductivity of solid solution decreases first and then increases as Cr 2 O 3 doping content, reaches the maximum value of 4.33 × 10 −3 S cm −1 at 850 °C. The doping of Cr 2 O 3 is beneficial to improve the conductivity of the solid solution at low temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Shaobo Yang,Chenxi Liang,Jiali Li,Yujie Ma,Sijie Kou,Juanli Deng,Bo Chen,Shangwu Fan
The study investigated the corrosion behavior and mechanical performance of SiC/SiC composite joints with Y 2 O 3 -Al 2 O 3 -SiO 2 (YAS) interlayers under high-temperature steam environments at 1200 °C. Under low-flow conditions, partial disruption of Si-O and Al-O bonds in the YAS glass network reduced crosslinking, forming an aluminosilicate protective layer that inhibited further corrosion. Prolonged exposure led to Y 3+ migration and accumulation, resulting in Y 2 Si 2 O 7 precipitation and growth. High-flow conditions caused a thinner glass layer, continuous longitudinal cracks, and more severe erosion and dissolution of the YAS glass due to higher steam velocity. Despite these degradations, the joints exhibited satisfactory performance, maintaining shear strengths of about 40 ± 2 MPa after 15 h of low-flow exposure and about 36 ± 5 MPa after 5 h of high-flow exposure. These findings demonstrate that YAS interlayers provide excellent corrosion resistance and mechanical stability as a sealant for nuclear-grade SiC/SiC.
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 39
·6925-6932
·
IF 3.756
Shuai Hu,Maohui Yuan,Changqing Song,Kai Han,Linxuan Wang,Hanchang Huang,Wenda Cui,Zining Yang,Hongyan Wang
Flame spray pyrolysis (FSP) is a potential strategy to scale-up the fabrication of upconversion nanoparticles (UCNPs) from the laboratory to industrial-scale production. The traditional FSP method involves the addition of 2-ethylhexanoic acid (2-EHA) to the precursors to obtain pure homogeneous ultrafine nanoparticles. However, there is still a lack of investigation into how the physical and optical properties are affected by 2-EHA. Here, for the first time, we report the role of 2-EHA in manipulating the morphology, size, and upconversion (UC) properties of Yb3+/Ho3+ co-doped Y2O3 UCNPs. The Y2O3:Yb3+/Ho3+ UCNPs were synthesized by adjusting the molar ratios of 2-EHA to trivalent rare earth ions (RE3+) in the precursor solution via the FSP method. The influence on the morphology and upconversion luminescence (UCL) properties of the UCNPs by 2-EHA was studied in detail. As the ratio of 2-EHA to RE3+ (2-EHA/RE3+) in the precursors increases from 0 to 3, the synthesized UCNPs initially form a mixture of large hollow particles and homogeneous ultrafine nanoparticles at low ratios and then uniform ultrafine nanoparticles at relatively high ratios. The typical green (550 nm) and red (667 nm) UCL reduce as the 2-EHA/RE3+ ratio increases. Moreover, the effect of 2-EHA on the temperature sensing behavior of the Y2O3:Yb3+/Ho3+ UCNPs was evaluated via the fluorescence intensity ratio (FIR) method based on the non-thermally coupled 5F4/5S2 and 5F5 levels of Ho3+ ions. The highest absolute sensitivity (SA) and relative sensitivity (SR) of 6.259% and 0.483% K−1 at 323 K, respectively, were determined and the sensitivity dependence on the 2-EHA/RE3+ ratio of the UCNPs was comparatively estimated.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2025
·
IF 7
Shengbin Dai,Jiangqi Zhu,Shun Wu,Martin Heilmaier,Yuman Zhu,Xingchen Yan,Aijun Huang
The retention of dislocation cellular patterns (DCPs) in laser powder bed fusion (LPBF) processed metals offers a novel pathway for achieving strength-ductility balance in high-temperature applications. This study innovatively combines oxide dispersion strengthening (ODS) with tailored heat treatment to stabilize DCPs in Inconel 718 (IN718) superalloys. Through strategic introduction of yttrium oxide (Y 2 O 3 ) nanoparticles (average diameter ≈40 nm) and optimized solution treatments (1200 °C for 5min/1 h), we resolve the inherent conflict between residual stress elimination and microstructure preservation in LPBF-fabricated components. The 5-min treated ODS alloy achieves exceptional synergy at 650 °C: yield strength maintains 600 MPa while ductility increases 45 % (from 20 % to 29 %) compared to as-built specimens. Crucially, our approach demonstrates two key innovations: 1) Y 2 O 3 nanoparticles effectively pin dislocations movements, preserving DCPs structure against thermal coarsening; 2) Ultra-short heat treatment duration enables complete Laves phase dissolution without compromising dislocation network integrity. Microstructural analysis confirms that the stabilized DCPs-Y 2 O 3 composite architecture facilitates simultaneous stress and strain accommodation. This work establishes a new paradigm for designing high-performance LPBF alloys through coupled process-microstructure optimization, particularly for aerospace components requiring elevated temperature mechanical stability.
研究领域:
材料科学
·
增材制造
·
冶金学
·
高温合金
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jian Li,Jia Liu,Yeqing He,Xiaohan Zhang,Yanxiang Jiang,Yang Wang,Wei Sun,Yuanyuan Zhou,Walther Glaubitt,Futian Liu,Haitao Wu,Fei Wang,Ling Li
High-performance dielectric ceramics are vital for next-generation microwave devices, requiring advanced doping and composite strategies to enhance material properties. The (1- x )MgAl 2 O 4 - x Y 3 Al 5 O 12 composite ceramics were found in the MgO-Al 2 O 3 -Y 2 O 3 pseudoternary phase diagram and synthesized via solid-phase reaction. The two phases coexist to improve grain size distribution and achieve a low eutectic temperature, allowing x = 0.1–0.7 samples to gain a dense microstructure ( ρ > 96 %) when sintered at 1650–1670 °C. The semi-coherent interface, coupled with the Mg 2+ /Y 3+ cation transition zone, promotes the formation of a partial solid solution, thereby alleviating interfacial stress at the grain boundaries between MgAl 2 O 4 and Y 3 Al 5 O 12 . Notably, the 0.3MgAl 2 O 4 -0.7Y 3 Al 5 O 12 ceramic exhibits satisfying microwave dielectric properties: ε r = 10.1 ± 0.24, Q × f = 195,000 ± 12,000 GHz, and τ f = −11.9 ppm/°C. In addition to phase composition and microstructure, the enhanced performance can be attributed to the optimized crystal structure. The partial substitution of Y 3+ by Mg 2+ with a smaller radius induced the “rattling” effect and abnormal large permittivity in the [YO 8 ] site. The 27 Al NMR spectra revealed an increase in the Mg-Al inversion degree in the Mg-deficient spinel structure, resulting in the elevated total covalency of the Al-O bond. The structural changes corresponded to a decrease in intrinsic dielectric loss in Mg-Al spinel and an increase in τ f in the Y-Al garnet phase. These findings indicate the (1- x )MgAl 2 O 4 - x Y 3 Al 5 O 12 ceramics have promising applications in the field of HTCC millimeter wave communications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jinfeng Qiu,Guangliang Chen,Yingchun Guo,Tongtong Li,Peisong Tang,Bin He,Xianhui Zhang,Jun Huang
Engineering efficient bifunctional electrocatalysts for simultaneous hydrogen and oxygen evolution reactions (HER/OER) remains very crucial for practical anion exchange membrane water electrolyzers (AEMWEs). Herein, a yttrium oxide doped cubic Co 3 O 4 (Y 2 O 3 -Co 3 O 4 ) catalyst engineered on plasma-treated carbon cloth (PCC) is reported which demonstrates exceptional performances for overall seawater splitting. Synthesized at an optimal crystallization temperature (250 °C), the obtained Y 2 O 3 -Co 3 O 4 /PCC features rich heterointerfaces which optimize active sites and enhance electron transfer, thereby, causing an outstanding HER activity with ultralow overpotentials of 301 mV (alkaline) and 346 mV (seawater) for transferring 1000 mA cm −2 ( j 1000 ). When the catalyst is integrated into AEMWE devices, low cell voltages of 2.11 V (alkaline) and 2.47 V (alkalized seawater) are achieved for generating j 1000 . Combined with the experimental and theoretical investigations, it reveals that the yttrium doping induces a favorable electron redistribution, where the electron delocalization of Y-site stabilizes Co 3 ⁺ species and the electron accumulation of Co-site optimizes H* adsorption. In addition, the formed heterointerface of Y 2 O 3 -Co 3 O 4 simultaneously enhances OER activity through optimizing the oxygen intermediate adsorption and strengthening the metal-oxygen bonds. Furthermore, the heterostructure design additionally reduces the lattice strain and accelerates charge transfer kinetics for seawater splitting.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 14
·1082
·
IF 3.2
Pang Bo,Cui Yanqun,Yin Jing
As a fundamental element in integrated photonic systems, the functionality of polymer-based waveguide amplifiers is primarily determined by the optical properties of the active material. More precisely, the amplification bandwidth establishes the working spectral region of the photonic circuit. Consequently, developing gain media that feature both broad bandwidth and high gain has emerged as a critical challenge in the field. The performance of this gain medium is fundamentally determined by rare-earth-ion-doped crystals, as the emission spectrum of these crystals ultimately dictates the achievable gain bandwidth. In this study, Y 2 O 3 : Yb, Er, Ce crystals with emission peaks covering the entire S + C + L band were prepared. In Y₂O₃ crystals with low crystal field symmetry, the 4 I₁₃/₂ and 4 I₁₅/₂ levels of Er 3+ ions were observed to undergo severe splitting, which in turn allows for effective broadening of the operational bandwidth. Fluorescence analysis reveals that the broadband emission from Er 3+ ions stems from the pronounced energy level splitting caused by the crystal field effect. When irradiated with a 980 nm laser, the emitted peak coverage from these Y 2 O 3 : Yb, Er, Ce crystals spans the complete S + C + L spectral range, demonstrating broadband optical amplification properties. Incorporation of Ce 3+ substantially improved the emission strength within these crystals across the S + C + L spectral region. Given their remarkable broadband luminescence characteristics across the S + C + L spectral range, Y 2 O 3 : Yb, Er, Ce materials represent promising candidates for gain media in next-generation polymer-based optical amplifiers.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·6301-6316
·
IF 3.9
Xiao-Tong Jia,Zhao-Hui Zhang,Tian-Hao Xu,Luo-Jin Liu,Yuan-Hao Sun,Xian-Yu Li,Qiang Wang,Zhao-Hu Jia,Yang-Yu He,Xing-Wang Cheng
Aluminum oxynitride (AlON) ceramics doped with different sintering aids were synthesized by spark plasma sintering process. The microstructures, mechanical, and optical properties of the ceramics were investigated. The results indicate that the optimal amount of sintering aids is 0.06 wt% La 2 O 3 + 0.16 wt% Y 2 O 3 + 0.30 wt% MgO. The addition of La 3+ and Mg 2+ decreases the rate of grain boundary migration in ceramics, promotes pore elimination, and inhibits grain growth. The addition of Y 3+ facilitates liquid-phase sintering of AlON ceramics. Moreover, the addition of Mg 2+ effectively promotes twin formation in the ceramics, which hinders crack propagation and dislocation motion when the ceramics are loaded. Hence, the AlON ceramic doped with 0.06 wt% La 2 O 3 + 0.16 wt% Y 2 O 3 + 0.30 wt% MgO exhibits a relative density of 99.95%, an average grain size of 9.42 μm, and a twin boundary content of 10.3%, which contributes to its excellent mechanical and optical properties.
研究领域:
材料科学
·
陶瓷
·
烧结技术
✓ 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）