Defence Technology
·
2020
·Vol. 17
·期 2
·467-477
·
IF 2.637
Lu-yao Wang,Jian-wei Jiang,Mei Li,Jian-bing Men,Shu-you Wang
Projectiles made of reactive structure materials (RSM) can damage the target with not only kinetic but also chemical energy, but the enhanced damage potential of RSM may become compromised if extreme loading condition disintegrates the projectile before the target is reached. In this work, a ductile coating of Ni was introduced to a tungsten-zirconium (W-Zr) alloy, a typical brittle RSM, to preserve the damage potential of the projectile. Detonation driving tests were carried out with X-ray photography and gunpowder deflagration driving tests were carried out with high-speed photography for the coated and uncoated RSM samples, respectively. The craters on the witness target were analyzed by scanning electron microscopy and X-ray diffraction. The Ni coating was found to effectively preserve the damage potential of the W-Zr alloy under extreme loading conditions, whereas the uncoated sample fractured and ignited before impacting the target in both detonation and deflagration driving. The crack propagation between the reactively brittle core and the ductile coating was analyzed based on the crack arrest theory to mechanistically demonstrate how the coating improves the structural integrity and preserves the damage potential of the projectile. Specifically, the Ni coating envelops the W-Zr core until the coated sphere penetrates the target, and the coating is then eroded and worn to release the reactive core for the projectile to damage the target more intensively.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2019
·
IF 2.794
Jian Zhang,Ye Tian,Jiawen Zhu,Yi Sun,Guoqiang Luo,Qiang Shen,Lianmeng Zhang
In this study, the W-HfC-Zr composites with various Zr content were fabricated via plasma activated sintering. The relative density, microstructure, microhardness , as well as mechanical properties of these composites were investigated. The W-HfC-Zr composite with 1.0 wt% Zr content had high relative density of 97.56%, exhibited the higher microhardness of 614 Hv, compressive yield strength of 1.85 GPa and bending strength of 880 MPa, which attributing to Zr captured impurity oxygen and generated solid-solution oxide (Hf, Zr)O. The enhancement mechanisms of trace Zr addition on microstructure and mechanical properties were proposed.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 6
·5160-5175
·
IF 2.993
Wang Luyao,Gao Jianping,An Zhaolin,Zhao Xiaoxiang,Yao Hongduo,Zhang Man,Tian Qiang,Zhai Xiangang,Liu Yu
Emulsions, usually oil-in-water emulsions, have been widely applied to the preparation of hydrophobic drug carriers. However, the synthesis of safe, biocompatible and high-performance carriers for water-soluble drugs remains a challenge. So polyacrylamide (PAM) microspheres stabilized by carbon dots (CDs) were fabricated via a water-in-oil Pickering emulsion without the use of any surfactant. The PAM/CD microspheres were spherical with an even distribution of the CDs on their surfaces. The size of the microspheres can be controlled by changing the amount of CDs, which also influenced the drug loading properties. The hydrophilic chemotherapy drug, 5-fluorouracil (5-FU), was successfully loaded into the PAM/CD microspheres through incubation. The encapsulation efficiencies ranged from 68 to 82% with a maximum drug loading of 48%. The 5-FU release profiles depended on the concentration of the drug incubation solution, the concentration of the CD solution and the pH of the drug release environment. The release of 5-FU was relatively steady for the first 12 h and followed non-Fickian diffusion kinetics. This synthetic approach could be extrapolated to loading of other water-soluble drugs into hydrophilic polymers.
研究领域:
材料科学
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药物递送
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纳米技术
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生物医学工程
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高分子化学
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高影响因子
THIN SOLID FILMS
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2013
·
IF 1.604
Mi Wang,Yanfeng Gao,Zhang Chen,Chuanxiang Cao,Jiadong Zhou,Lei Dai,Xuhong Guo
High-quality transparent and conductive tungsten-doped tin oxide (SnO 2 :W) thin films with different thickness (from 60 to 600 ± 10 nm) were fabricated on quartz glass substrates by a solution-based method. A stable solution was prepared from tin chloride and ammonium tungstate together with polyvinyl alcohol as a film-forming promoter. It was found that all films showed homogeneous composition, smooth surface with no cracks and high transparency with the optical band gap ranging from 3.93 to 4.31 eV. The effect of tungsten concentration, spin rate and annealing temperature on the morphological, electrical and optical properties of the films has been investigated. W doping has a large influence on the microstructure and the conductivity of the SnO 2 thin films . The lowest resistivity of 2.8 × 10 − 3 Ω · cm was obtained for a SnO 2 : 3 at% W film, which was prepared at 3000 rpm and annealed at 800 °C in air. An eight-layer film with a sheet resistance of 60 Ω/□ and a thickness of 606 nm could be fabricated by multiple coating operation, which still exhibited an optical transmittance of over 80% in the visible region from 400 to 700 nm.
研究领域:
材料科学
·
薄膜技术
·
光电子学
·
半导体掺杂
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RSC Advances
·
2019
·Vol. 9
·期 46
·26718-26728
·
IF 3.049
Wei Han,Wenlong Li,Jiazhuang Chen,Mei Li,Zhuyao Li,Yongchang Dong,Milin Zhang
Cyclic voltammetry, square wave voltammetry, linear polarization, chronopotentiometry and chronoamperometry were performed to investigate the electrochemical properties of Y(III) on W and Pb electrodes in LiCl–KCl eutectic melts. The diffusion coefficient of Y(III) measured by various techniques was in the order of 10−5. The nucleation of Y on W electrode was found to comply with the instantaneous nucleation mechanism. With increasing temperature, the exchange current densities increased and the charge-transfer resistances decreased, and exchange current densities are distinctly larger on liquid Pb electrode compared with W electrode. In addition, the co-deposition mechanism of Y(III) and Pb(II) on W electrode was also studied and four Pb–Y intermetallics could be detected. The feasibility of extraction metallic Y from the melts was explored by co-deposition on W electrode and under-potential deposition on liquid Pb electrode and the extracted products consisted of Pb3Y and Pb phases.
研究领域:
材料科学
·
电化学
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Liangqi Zhang,Rui Bao,Jianhong Yi,Shengda Guo,Jingmei Tao,Caiju Li,Dong Fang,Yichun Liu,Fengxian Li
As a hybrid reinforcement, interconnected architecture of carbon nanotubes (CNT)/Tungsten (W) composite powder was designed and fabricated by spraying pyrolysis (SP) method. Subsequently, CNT-W/copper (Cu) composites were fabricated successfully by low energy ball milling (LEBM) and spark plasma sintering (SPS). The electronic conductivity , mechanical properties, micro-morphology and interface microstructure of CNT-W/Cu composites were evaluated and characterized. The results revealed that CNT with attached W were dispersed uniformly in the Cu matrix and W particles played a “pinning” role of the CNT. The 0.6 wt%CNT-W sample exhibited ultimate tensile strength 226 MPa and the elongation 33%, which were 14% and 83% higher than that of pure Cu, respectively. Besides, the 0.8 wt% CNT-W sample exhibited electrical conductivity 92.3%IACS, which is very close to that of Cu matrix (92.6%IACS). Finally, the strengthening and electric conductivity mechanisms of CNT-W in Cu matrix were considered. This study inspires a new way of synergistically reinforced metal matrix composites .
研究领域:
材料科学
·
纳米技术
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MATERIALS SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.008
D. Tan,Y. Liu,W. Guo,J. Wang,Z. Chang,D. Li
In the present work, W–Bi–S-tridoped TiO2 nanoparticles were synthesised by a simple sol–gel method. The structure and morphology of as-prepared W–Bi–S-tridoped TiO2 were characterised by using X-ray powder diffraction, transmission electron microscopy, scanning electron microscopy and UV–Vis diffuse reflectance spectrum. It was found that the W–Bi–S-tridoped TiO2 nanoparticles were well crystallised with a small size distribution. The absorption edge of TiO2 was extended into visible-light region obviously after being doped with W, Bi and S. The photocatalytic degradation of methylene blue was used as a probe reaction to evaluate the efficiency of W, Bi and S doping. The W–Bi–S-tridoped TiO2 exhibited the best photocatalytic activity, compared with TiO2, S-TiO2, W–S–TiO2 and Bi–S–TiO2. The mechanism that enhanced photocatalytic activity might be attributed to the synergistic effect of W, Bi and S.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118901
·
IF 6.3
Zipeng Huang,Lili Gan,Lihua Qiao,Yanru Wu,Chenru Hao,Li Cheng,Ziqiang Chi
Microwave dielectric ceramics for next-generation communication systems require a high relative permittivity (
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Rui Zhang,Xu Liu,Huimin Mao,Zhenyu Xiao,Jingqi Chi,Xiaobin Liu,Lei Wang
Electrochemical upcycling of waste PET into value-added formate • Soybean root-inspired design of symbiotic active sites • Oxygen-bridge-induced 3d-5d orbital hybridization The efficient transformation of waste poly(ethylene terephthalate) (PET) into high-value chemicals represents a pivotal strategy toward a circular plastics economy. Drawing inspiration from the cooperative nitrogen-fixation relationship between rhizobia and leguminous plants, we report a tungsten-modified nickel phosphide (W-Ni 2 P) catalyst for the selective electrooxidation of PET-derived ethylene glycol (EG) into formic acid (FA). Upon electrochemical activation, robust asymmetric W-O-Ni oxygen-bridged configurations are formed in situ, establishing cooperative catalytic centers in which W operates as an electronic modulator while Ni serves as the dominant active site. The tungsten centers display strong adsorption toward *EG and *OH intermediates, functioning as dynamic buffering sites that regulate the interfacial microenvironment and concurrently facilitate the reconstruction of Ni into highly active oxyhydroxide species. This synergistic interplay, governed by W-O-Ni-mediated 3d-5d orbital interactions, effectively reduces the kinetic barriers associated with C-H dehydrogenation and C-C bond cleavage. Consequently, the optimized W-Ni 2 P catalyst achieves a current density of 500 mA cm -2 at 1.45 V versus RHE, delivering a Faradaic efficiency of 98.9% for FA production. Moreover, an anion-exchange-membrane electrolyzer sustains stable operation for over 200 hours in authentic PET hydrolysate, highlighting the system’s practical durability, scalability, and economic potential for plastic waste upcycling. Download: Download high-res image (212KB) Download: Download full-size image Inspired by rhizobium-legume symbiosis, W was incorporated into Ni 2 P to form cooperative W-O-Ni active sites, which facilitate Ni reconstruction, optimize intermediate adsorption, lower EGOR energy barriers, and promote highly efficient formic acid production from PET waste.
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Russian Journal of Physical Chemistry A
·
2026
·Vol. 100
·期 2
·262-268
·
IF 0.7
Ying Lin,Gao Teng,Huang Guobin,Liu Mengli,Cao Qinyu,Zhuang Naifeng,Chen Wenjie
A series of Sm 3+ -doped CaGdAlO 4 (CGA) phosphors were successfully synthesized via a high-temperature solid-state method. The crystal structure and luminescent properties of the samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and fluorescence spectrometry, with Rietveld refinement confirming a tetragonal crystal structure (consistent with observed XRD patterns).The CGA:0.02Sm 3+ phosphor can be efficiently excited by blue-violet light (408 nm), emitting intense orange-red luminescence. The optimal Sm 3+ doping concentration is 2 mol % (maximum luminous intensity), and the concentration quenching mechanism is attributed to dipole-dipole interactions. The optimal sample exhibits excellent thermal stability in the range of 298–523 K, with an activation energy of 0.11 eV. When used as a red component in white LED (w-LED) devices, CGA:0.02Sm 3+ delivers outstanding performance: a high color rendering index (Ra = 91.2) and CIE chromaticity coordinates of (0.3148, 0.3488), indicating its potential as an orange-red phosphor for lighting and display applications. Additionally, first-principles calculations based on density-functional theory (DFT) were performed to investigate the electronic structures and density of states of pure CGA and Sm 3+ -doped CGA.
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2025
·
IF 3.4
Wei Wang,Ming Yin,Qichao Wu
Nickel-based coatings are known for their exceptional properties and high microhardness, making them widely used to enhance the surface performance of metal components. In order to investigate the effect of pulse current densities ( I D ) on the performance and structure of the coatings, the Ni/W–TiN coatings were prefabricated on a 45 steel substrate by using a pulse electrodeposition (PED) approach. The study examines how varying pulse current densities ( I D ) impact the coatings' microstructure, microhardness, phase composition, and wear/corrosion resistance. Among the coatings tested, the one deposited at an I D value equal to 0.5 A/dm 2 revealed the best structure, with average sizes of 66.4 nm for Ni–W grains and 39.3 nm for TiN nanoparticles. XRD patterns revealed characteristic peaks at 43.8°, 50.5°, and 74.2°, corresponding to the (1 1 1), (2 0 0), and (2 2 0) planar directions of Ni–W. The value of pulse I D significantly influenced the microhardness value of the coatings. The sample deposited at 0.1 A/dm 2 showed a microhardness of approximately 675.4 HV, while the coating formed at 0.5 A/dm 2 showed the highest microhardness at around 834.9 HV. Moreover, Ni/W–TiN coating deposited at 0.5 A/dm 2 showed the lowest corrosion value equal to 0.71 A/cm 2 .
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Yanli Deng,Lutong Li,Long Wang,Na Wu,Huihui Jin,Feng Gao,Zhihui Zeng
W-type ferrites possessing low cost and high chemical stability, show high potential in electromagnetic wave (EMW) absorption field. However, due to the low dielectric loss, developing high EMW absorption performance of W-type ferrites remains desired. Here, rare earth (RE) cerium (Ce)-doped W-type barium ferrites (Ba 1-y Ce y Ni 2 Fe 15.4 O 27 , y=0.1, 0.2, 0.3, 0.4, 0.5, 0.6) are prepared by a sol-gel approach. The influences of Ce doping are detailed analyzed. Ce ions with unpaired 4f electrons and strong spin-orbit coupling of angular momentum enhance the dielectric and magnetic properties of ferrites. Ba 0.7 Ce 0.3 Ni 2 Fe 15.4 O 27 achieves the minimum reflection loss (RL min ) value of -52 dB while Ba 0.6 Ce 0.4 Ni 2 Fe 15.4 O 27 showcases the widest effective absorption bandwidth (EAB) of 1.36 GHz associated with the RL min reaching -38 dB, significantly outperforming the undoped ferrites. This work thus demonstrates a high-efficiency utilization of Ce for enhancing the EMW absorption performance of widely employed W-type barium ferrites, efficiently advancing the application field of RE elements.
研究领域:
材料科学
·
电磁学
·
化学
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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）