JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
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IF 3.1
Yang Zhan-jun,Liu Hao,Das Oisik,Wang Xiao-qian,Li Mi,Han Zhong-xuan,Jiang Lin,Rotaru Andrei
This study contributes to advancing research in aluminium alloys employed as fuels for thermites (pyrotechnic compositions formed of metal and metal oxide powders). Aluminium alloys possess certain potential in regulating energy release and enhancing combustion efficiency; in order to explore better formulations for the aluminium alloy fuel thermite, PVDF-coated Al–Si samples with different proportions were prepared here by using the electrostatic spraying method. In this study, we are primarily addressing the energy release limitation problems which are imposed by the oxide layer formation during the combustion of aluminium–silicon alloy powders in air and explore the optimal formulation of aluminium–silicon fuel combined with fluoropolymer oxidants. Leveraging advanced electrostatic spraying technology, various PVDF (polyvinylidene fluoride)-coated Al–Si samples (Al–Si@PVDF) were successfully synthesized. Morphological characterization confirmed the complete encapsulation of Al–Si alloy powders by PVDF, yielding spherical core–shell structures with uniform elemental distribution and favourable microstructural characteristics. Further, by thermal analysis and calorimetry investigation, a two-stage reaction between Al–Si and PVDF was unveiled: an initial PVDF decomposition phase followed by an ignition reaction phase. To comprehensively evaluate the combustion performance of samples with varying proportions, high-speed and infrared cameras were employed for precise observations, enabling a deep dive into the combustion parameters and their disparities under two distinct spatial conditions. Through these combustion performance experiments and post-combustion product analysis, we deduced the micro-combustion process mechanism of Al–Si@PVDF. This works not only that it provides a scientific basis for optimizing the formulation of aluminium–silicon fuels and fluoropolymer oxidants, but also holds positive implications for advancing research and development in aluminium alloy-based metastable intermolecular composites. Last but not least, besides the high combustion rates, low ignition temperatures, stable combustion, and strong exothermic performance were obtained for these thermite composite materials.
研究领域:
材料科学
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燃烧学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2024
·
IF 5
Zhanjun Yang,Hao Liu,Li Mi,Xiaoqian Wang,Oisik Das,Zhong xuan Han,Lin Jiang
To investigate the differences in combustion and energy release characteristics of metastable intermolecular composite materials composed of aluminum alloys and polyvinylidene fluoride (PVDF) with different compositions, two types of alloys were selected: Al-Mg and Al-Si. Pure aluminum powder of the same size was also chosen for comparison. The PVDF-coated metal particle composites and the mixtures of PVDF with metal particles were prepared using electrospray (ES) and physical blending methods (PM), respectively. A systematic study was conducted on the morphology, compositional structure, combustion performance, energy release characteristics, and thermal reactivity of the fabricated composites and their combustion products through scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), combustion performance experiments, closed vessel pressure tests, and simultaneous thermogravimetric-differential scanning calorimetry (TG-DSC). The experimental results indicated that the PVDF-coated metal particles prepared by the electrospray method exhibited a distinct core-shell structure, with the metal particles in close contact with the PVDF matrix. Compared to the PM blended materials, the ES composites demonstrated superior combustion performance and energy release characteristics during combustion. Analysis of different metal fuel systems under identical preparation conditions revealed that Al-Mg and Al-Si fuels modulate the combustion and energy release properties of aluminum alloy-PVDF MICs through two distinct pathways.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2021
·Vol. 73
·期 12
·3727-3733
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IF 2.474
Yang Jiaxin,Tao Wenju,Chen Liyu,He Jingui,Zhang Yifan,Yu Jiangyu,Wang Zhaowen
The preparation of high-purity and high-value alloys is of great significance to industrial production. The purpose of this study is to explore the process of producing aluminum-silicon (Al-Si) alloy by the electrochemical Al-Si eutectoid method. The electrochemical behavior of aluminum and silicon on tungsten electrode was studied by cyclic voltammetry and galvanostatic chronopotentiometry. The effect of SiO 2 addition on the eutectoid behavior of Al and Si was studied. The results show that the precipitation potential of Al is about –1.35 V (versus Pt), and the initial precipitation potential of Si is about –0.8 V (versus Pt). The precipitation process of silicon includes two reduction stages. In addition, the precipitation of Si is a quasireversible reaction controlled by diffusion process. Finally, Al-Si alloy was obtained by potentiostatic electrodeposition at –1.8 V potential, indicating that Al and Si would codeposit at this potential.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Yonghui Yang,Hengwei Yan,Pengchen Yang,Zhanwei Liu,Guang Yang
The segregation of aluminum-silicon alloys directly impacts the mechanical and chemical properties of the alloys, Therefore, homogenization of alloys is of great significance for alloys. This study initially investigated the electrochemical behavior of aluminum (III) and silicon (IV) during the preparation of aluminum-silicon (Al-Si) alloys in NaF-AlF 3 -Al 2 O 3 -SiO 2 molten salts through cyclic voltammetry and steady-state polarization. The results revealed that Al 2 O 3 underwent one-step reduction to Al, whereas SiO 2 underwent a two-step reduction process to Si. In addition, electrolysis experiments were carried out in a NaF-AlF 3 -Al 2 O 3 -SiO 2 -5wt%CaF 2 -1wt%MgF 2 -2wt%LiF molten salt system with molecular ratio of 2.4. These experiments involved variations in current density, electrolysis time, Al 2 O 3 and SiO 2 additions. It is worth noting that under the conditions of current density of 0.7 A/cm 2 , electrolysis time of 2 h, and silica addition of 2 %, the reduction rate of silicon reached a maximum value of 72.57 %, at which time the silicon in the aluminum-silicon alloys showed a dendritic structure, which was uniformly distributed throughout the entire alloy, and the segregation of the alloy was effectively avoided.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
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2021
·
IF 10.998
Yubei Zhang,Shan Li,Yantong Zhao,Wenyan Duan,Bingshan Liu,Tongcai Wang,Gong Wang
This paper proposed a kind of aluminum alloy powder additive manufacturing technology through surface modification of AlSi10Mg particles and digital light processing (DLP) printing. Firstly, AlSi10Mg particles were coated by styrene through suspension polymerization . The TEM results showed that the coating thickness is approximately 200 nm to 400 nm. Secondly, printing slurry was prepared by mixing photocurable acrylate resin with AlSi10Mg powder. The printing experiments showed that the curing depth of the printing slurry was obviously improved after surface coating of AlSi10Mg power. And the reason was discussed in detail. Then, the photocuring behavior and viscosity of the printing slurry were tested and analyzed. Finally, complex structures of AlSi10Mg material were successfully fabricated by digital light processing. It is demonstrated that surface modification is a feasible method for the photocurable printing of ultrafine alloy powder, which can also be expanded to the additive manufacturing of other alloy systems .
研究领域:
材料科学
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增材制造
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2021
·
IF 7.205
Xuelin Huang,Liang Yu,Yinsheng Dong
A series of aluminum phosphate ceramic coating with the entrapped ceria (CeO 2 ) nanoparticles, which is denoted APC, were constructed by steam-assisted curing method on cast Al-10Si alloy. The composition, structure and morphology of the coatings were investigated using FT-IR, XRD, XPS and SEM. Moreover, the corrosion properties of coatings were evaluated by the electrochemical tests. All the coatings were demonstrated to be homogeneous, compact on the substrate surface. The appropriate amount of CeO 2 can effectively improve the corrosion resistance and durability of the coating. In addition, the formation and corrosion resistance mechanism of the coatings were studied in this work.
研究领域:
材料科学
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腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2020
·Vol. 94
·期 3
·671-680
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IF 2.008
Huang Xuelin,Ke Rui,Dong Yinsheng
A hybrid organic–inorganic sol–gel coating was prepared on the surface of cast aluminum–silicon (Al–Si) alloy via dip coating method to improve the anticorrosion ability. In the present work, bis(triethoxysilyl) ethane (BTSE) and 3-glycidoxypropyl-trimethoxysilane (GPTMS) were employed as the precursors to prepare hybrid sol–gel (BG) coating. Nano titanium dioxide (nano-TiO 2 ) was introduced to improve the corrosion resistance of the coating. The microstructures of the BG/nano-TiO 2 (BG-T) coating was characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and Fourier-transform infrared (FT-IR) spectroscopy. The results showed that there was a chemical reaction between nano-TiO 2 and BG coating and a complete defect-free coating formed on the surface of Al–Si alloy. Moreover, there were a few only minor cracks appeared on the surface of BG-T coating after 15 days immersion in 3.5 wt.% NaCl solution. The corrosion resistant performances of the coatings were evaluated by the electrochemical tests. The results showed that the nano-TiO 2 particles elevated the corrosion potential and depressed the corrosion current, thereby improved the corrosion resistance. The long-term immersion tests of BG and BG-T coating further showed that the BG-T coating possesses an excellent long-term stability for corrosion protection.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Weiting Li,Xudong Yang,Kunming Yang,Chunnian He,Junwei Sha,Chunsheng Shi,Yunhui Mei,Jiajun Li,Naiqin Zhao
The integrity and regularity of pore morphology play an important role in determining the mechanical properties of the metallic foam materials. The conventional methods on refining pore morphology are mainly focused on the optimization of fabrication techniques, however, they are usually inconvenient and complicated. Recently, incorporating nano reinforcement is considered to be a suitable way to fabricate metallic composite foams accompanied by optimized pore morphology and enhanced mechanical properties. In this work, through a facile and rapid powder metallurgy foaming method, the aluminum-silicon (Al-Si) alloy composite foams reinforced by graphene nanosheets (GNSs) are successfully fabricated. The microstructure analyses reveal that, for the Al-Si alloy foams incorporating the GNSs (GNSs/Al-Si composite foams), the pore size is transformed to be smaller, the pore size distributions become more homogeneous and the pore shape is also refined to a regular and roundish state. Meanwhile, the shape of Si precipitates is found transforming from an irregular long strip (length of ~20 μm, width of ~5 μm) to a fine particle state (diameter of ~5 μm). Moreover, the compressive testing results show that, the 0.4 wt% GNSs/Al-Si composite foams own the optimal compression stress of 11.7 ± 0.5 MPa, plateau stress of 10.0 ± 1.0 MPa and energy absorption capacity of 6.8 ± 0.7 MJ/m 3 , which have improvement of 58.1%, 53.8% and 51.1% in comparison with the Al-Si alloy foams counterpart, respectively. The present findings may pave a new way for developing new generation of metallic composite foams that with stable microstructure and excellent mechanical performance.
研究领域:
材料科学
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机械工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Xuelin Huang,Liang Yu,Yinsheng Dong
In this paper, a multiple hybrid coating (MHC) with good corrosion resistance and superhydrophobic property on the surface of cast Al–Si alloy was synthesized via a simple dip-coating method by using organosiloxane containing hydrophobic mullite-SiO 2 (M–S) particles as a precursor. The morphology, composition and water contact angle (WCA) of the coatings were investigated by SEM, FT-IR, XRD and OSA100, respectively. The results showed that the hydrophobic M–S particles was synthesized through modified Stöber method, which has a micro- and nano- scale structures. In addition, the morphology of the MHC presented that a dense and uniformly cover on the Al–Si alloy substrate formed a superhydrophobic surface with the WCA ∼153.4°. The corrosion protection of MHC was evaluated by using the Tafel polarization curves and electrochemical impedance spectroscopy. The coating with M–S particles exhibited much better corrosion resistance property than that of the untreated substrate and pure organosiloxane coating (OSC). The E corr was obviously more positive than that of them. Moreover, the corrosion current density of MHC was remarkably decreased by 5 and 3 orders of magnitude compared with other two coatings, respectively. The corrosion resistance of the MHC decreased gradually with increasing immersing time. However, the R ct value of MHC was still 2.31 × 10 6 Ω cm 2 after 168 h immersion testing in 0.6 M NaCl solution, which was nearly 322-fold higher than that of untreated substrate. Owing to the excellent superhydrophobic, corrosion resistance and long-term stability, the MHC possesses potential application in corrosion resistance of cast Al–Si alloy.
研究领域:
材料科学
·
表面工程
·
腐蚀科学
✓ 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）