JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Hao Zhong,Kang Chen,Chenglei Qin,Chengguang Lang,Jiangwen Liu,Hui Wang,Junrui Zhang,Liuzhang Ouyang
Onsite hydrogen generation by sodium borohydride hydrolysis resolves hydrogen energy supply system challenges. However, the spent-NaBH 4 regeneration is still a problem in the closed loop of this irreversible reaction. As the by-product is the key to the problem, NaB(OH) 4 is regarded as not the boron source but the hydrogen source of NaBH 4 regeneration. Therefore, in this study, inexpensive Al metal and NaB(OH) 4 are ball milled under argon to regenerate NaBH 4 without additional hydrogen input. However, the ball-milling reaction is hindered by the flexible Al and impact oxide layer, and the NaBH 4 yield is only approximately 22 %. Therefore, a brittle intermetallic compound Mg 2 Al 3 is reacted with NaB(OH) 4 by ball milling, achieving a NaBH 4 yield of over 42 %. The mechanism study shows that the brittleness of the raw material plays an important role in promoting the ball-milling reaction. This study achieves NaBH 4 regeneration using only Al as the reducing agent and provides a promising method to promote the mechanochemical regeneration of NaBH 4 .
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
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2024
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IF 5.8
Xueqin Liao,Daolun Liang,Fang Wang,Peini Xie,Yukun Chen,Jianzhong Liu
The long ignition delay time, high ignition temperature and agglomeration prevent the aluminum (Al) particles from fully releasing the chemical energy stored within them during combustion. Al-based alloy fuels with high energy density and excellent combustion performance have become a potential candidate for replacement with pure Al. Therefore, understanding the combustion and energy performance of Al-based alloys is beneficial for the development of Al-based energetic materials. Herein, the combustion and energy performance of pure Al and three Al-based alloys were comparatively investigated by means of a thermal analysis system, an ignition and combustion test apparatus, and a variety of physicochemical property characterizations. The results showed that all three Al-based alloys contained at least one intermetallic compound. Al-boron (B) and Al-magnesium (Mg)-B alloys had higher theoretical energy densities than pure Al, while Al-Mg did not. The thermal oxidation properties of all three alloys were significantly better than those of pure Al. Compared with pure Al, the three alloys showed higher burning rate, shorter ignition delays, more vigorous combustion, and higher burnout at room pressure in air. This is still true after adding AP. According to the compositions of the condensed combustion products, the possible chemical reactions during the combustion of the alloys were speculated. Grasping the combustion mechanisms of the alloys is challenging due to the relative lack of thermodynamic data on intermetallic compounds. Finally, a comprehensive comparison of the combustion processes of pure Al and alloys was made. Although the Al-Mg alloy does not have the same theoretical energy density as pure Al, the more outstanding combustion performance and fewer two-phase flow losses may make up for the gap in theoretical energy density.
研究领域:
材料科学
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燃烧学
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能源工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2018
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IF 3.414
Wei Li,Ming Li,Yi Yang,Qingsong Wei,Daosheng Cai,Jie Liu,Chunze Yan,Yusheng Shi
The microstructures and compressive properties of Ti-46.5Al-2.5Cr-2Nb-0.5Y alloy with varied boron (B) addition processed by selective laser melting (SLM) had been systematic studied. With increasing the B content from 0 to 2 wt%, the average grain size of SLM-processed Ti-46.5Al-2.5Cr-2Nb-0.5Y/B composites decreased from 16.64 µm to 5.66 µm, meanwhile, the {0001} texture index and high angle grain boundaries (HAGBs) increased from 10.78 and 87.9% to 22.69 and 94.4%. The phase evolution mechanism of Ti-46.5Al-2.5Cr-2Nb-0.5Y/B composites during the SLM process can be summarized as: firstly, β and B phases precipitated out from the liquid phase, then the β phase transformed to α phase and part of the α phase transferred to γ phase, later, some new phases of TiB 2 and AlB 2 emerged by the diffusion mechanism of B, Ti and Al atoms, and then the β and α phases orderly transformed to B 2 and α 2 , lastly, the γ, B 2 , B, TiB 2 , AlB 2 phases in a range of several hundred nanometers were randomly distributed within the α 2 matrix. Due to the grain refinement strengthening mechanism, the compressive strength and strain of Ti-46.5Al-2.5Cr-2Nb-0.5Y/B parts increased to the maximum of 1610.53 MPa and 5.17%.
研究领域:
材料科学
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力学
✓ 已验证
DOI
高影响因子
WEAR
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2020
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IF 4.108
Jingguo Fu,Meng Li,Gengshuo Liu,Shenglin Ma,Xinhe Zhu,Chunsheng Ma,Dong Cheng,Zhijun Yan
Ceramic based self-lubricating coating was successfully fabricated on Al-based plasma electrolytic oxidation (PEO) ceramic coating in this work. The coating was reinforced with thermosetting polyimide (PI) containing tungsten disulfide (WS 2 ) fillers. The morphology, chemical composition and phase structure of the PEO, PEO/PI and PEO/PI/WS 2 coatings were observed by SEM, EDS and XRD , respectively. Tribological properties of the coatings were comparatively investigated using a reciprocating pin-on-block tribotester under different conditions. Under dry sliding conditions, the friction coefficient of PEO/PI/WS 2 coating was about 0.4, which was 50% lower than that of PEO coating. Meanwhile, the wear rate of counter pin cooperated with PEO/PI/WS 2 coating was only 0.04 mg min −1 , which was 90.9% lower than that of PEO coating. Under step loading conditions, the load was ultimately increased to 70 N and the total duration time was about 35 min, while the corresponding values of PEO coating were 30 N and 13 min, respectively. These are owed to the hard ceramic coating and the soft self-lubricating coating, which can improve the load capacity and decrease the friction, of the ceramic based self-lubricating coating.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Duoduo Yang,Junhao He,Kaishen Chen,Yiping Cheng,Zhiyu Liu,Chengyun Zhang
Surface-enhanced Raman scattering (SERS) is a powerful, label-free technique for trace-level molecular detection; however, its broad application is limited by the lack of low-cost, scalable, and reproducible substrates. Here, we introduce a facile route to large-area SERS nanoplatform using liquid-assisted femtosecond (fs) laser direct writing (FLDW) in sucrose solution, followed by thermal evaporation of a thin Au nanofilm composed of nanoparticle clusters on aluminum-alloy substrates. By optimizing sucrose concentration and fs laser power, densely packed arrays of nanocones, nanoplates, and nipple-like protrusions are produced, serving as robust scaffolds for plasmonic hotspots. After thermal evaporation, the substrate exhibits super hydrophobicity with water contact angle (WCA) ∼157°, which concentrates analyte droplets and further amplifies Raman signals. Using Rhodamine 6 G (R6G) and malachite green (MG) as probe molecules, the limits of detection (LODs) were determined to be 3.5 × 10 −14 M for R6G and 6.6 × 10 −11 M for MG, with corresponding enhancement factors (EFs) of 1.19 × 10 11 and 6.13 × 10 7 , respectively. Uniformity tests yielded relative standard deviations (RSDs) below 4 %, and cycle reusability assays showed < 15 % signal loss. After 150 days, more than 80 % of the initial SERS signals were retained, confirming long-term stability under ambient conditions. Simulation results reveal intense electromagnetic hotspots localized at nanostructure tips and junctions, accounting for the substrate’s exceptional SERS performance. This straightforward, contamination-free approach enables scalable production of durable, high-performance SERS substrates for environmental monitoring, food safety, and biomedical diagnostics.
研究领域:
分析化学
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纳米科技
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生物医学工程
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环境监测
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食品安全
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分子诊断
✓ 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）