FUEL
·
2024
·
IF 6.7
Zongyang Zhang,Yuping Li,Ze Chen,Fuchao Ji,Xiaohong Liang,Haicheng Xuan,Lina Han,Peide Han
Developing an economical and high-efficiency synthesis pathway of SSZ-13 zeolite is of great significance for the ammonia selective catalytic reduction of nitrogen oxides (NH 3 -SCR of NO x ) reactions. Herein, SSZ-13 zeolite were synthesized using L zeolite as the aluminum source in the presence of a mixed structure directing agent (SDA) composed of N,N,N, trimethtyl-1-adamantammonium hydroxide (TMAdaOH) and tetraethylammonium hydroxide (TEAOH). This synthesis strategy aims to accelerate the crystallization rate through interzeolite transformation, while less expensive TEAOH can play a cooperative structure-directing role, thus reducing the consumption of expensive TMAdaOH template. The results showed that pure SSZ-13 zeolites with high crystallinity can be obtained from L zeolite within 12 h at 160 ℃ under low TMAdaOH/SiO 2 ratio of 0.05 (too low to carry out the synthesis on its own in the current synthesis system) in the presence of TEAOH. Moreover, the crystallization mechanism was also investigated by XRD, FT-IR, SEM and TG-DTG techniques. It was proposed that the crystallization of SSZ-13 occurs through the formation of SSZ-13 nuclei under the direction of TMAdaOH and promotion of TEAOH, subsequently TMAdaOH was incorporated in the framework to further induce the crystal growth of SSZ-13. Especially, the zeolite crystal size can be modulated by the amount of TEAOH added. In addition, After Cu 2+ exchange, the obtained Cu-SSZ-13 sample exhibits superior catalysis performance in the NH 3 -SCR of NO x reaction, and the NO x conversion rate remained over 90 % across a broad range from 200 to 600 °C, demonstrating its significant application potentials in NO x removal from diesel vehicle exhausts.
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高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Wenxia Zhang,Weixia Shen,Chao Fang,Ye Wang,Yuewen Zhang,Liangchao Chen,Qianqian Wang,Kenan Li,Biao Wan,Zhuangfei Zhang
Improving the thermal conductivity of diamond-metal composites has always been a significant challenge in the field of thermal management. In this paper, diamond/Al composites were systematically studied, and the influence of holding time (10-120 min) on interface structure and thermal conductivity was discussed. The research results shows that the long-term thermal diffusion sintering can effectively the dense interfacial bonding of diamond/Al composites and enhance the thermal conductivity. The diamond/Al composites with 50 vol% 900 μm diamond attained the highest value of 888.73 W/mK under the sintering conditions of 650 ℃, 50 MPa, and 120 min, nearly 92% of the theoretical value predicted by the Maxwell model. This study establishes that high thermal conductivity can be achieved through long-term thermal diffusion alone, without the complex diamond surface coating and substrate alloying.
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高影响因子
Defence Technology
·
2025
·
IF 5.9
Ting Liu,Jian Wang,Jie Chen,Cui Nie,Yaofeng Mao,Jun Wang,Ruolei Zhong,Wei Cao,Fude Nie
Aluminum (Al) powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics. However, the inert oxide layer (Al 2 O 3 ) on Al particles limits combustion reactivity and energy efficiency. Fluoride-based surface modification has been developed as an effective approach to address this issue. Here, four classical fluoropolymers (F11, F14, PVDF, PTFE) are employed as coatings to prepare core-shell Al/Fluoropolymer. The combustion experimental results demonstrate that the core-shell Al/PTFE exhibits the highest flame propagation rate (52.88 mm·ms -1 ) and pressure output (109.02 kPa) performance. Consequently, core-shell Al/PTFE is selected as a high-energy fuel to prepare RDX/Al/PTFE microspheres via the emulsion and solvent evaporation method, which can enhance the energy performance of RDX. The effects of the core-shell Al/PTFE ratio and RDX content on the combustion heat and pressure output are systematically investigated. The peak pressure reaches a maximum of 187.8 kPa when the mass ratio of RDX, Al, and PTFE is 60: 25: 10. Additionally, RDX/Al/PTFE microspheres exhibit significantly higher laser-induced air shock velocities, detonation heat, and detonation pressure than those of pure RDX and RDX/Al. The mechanism underlying the enhanced reactivity and energetic performance is attributed to the ability of PTFE to etch the inert Al 2 O 3 shell on the surface of Al particles, thereby improving post-combustion reactions and significantly increasing the overall energy output of RDX explosives. This work offers a novel design strategy for high-energy structural thermobaric explosives for the practical applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Chuandong Wu,Jian Zhang,Guoqiang Luo,Qiang Shen,Zhanghua Gan,Jing Liu,Lianmeng Zhang
To provide insight into interfacial segregation and precipitates behavior in the ultrafine grained Al-based metal matrix composites , AA7075/B 4 C composite was selected as the model system. The bulk composite was synthesized via cryomilling, field assistant sintering and followed heat treatment. The segregation layer of MgO was observed to increase from ∼15 nm to 20–25 nm during heat treatment due to faster solute diffusion caused by the Al/B 4 C interface and large volume fraction of grain boundaries. In addition to the segregation, representative TEM results show that the spherical GP zone and platelet η′ precipitates distribute in grain interior, while several coarser η precipitates located at LAGB and HAGB with the orientation relationship of (0001)//(1 1 ( _ ) 1) and [10 1 ( _ ) 0] η //[110] Al . However, the precipitates at LAGB exhibit finer size relative to those at HAGB, which could be ascribed to the higher accumulation of solute atoms at HAGB to favor the growth and coarsening of the precipitation during heat treatment.
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高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Yi Sun,Qiang Shen
The microstructural design offers an effective strategy for overcoming the strength-ductility trade-off in Al-based composites. In this study, we demonstrate concurrent improvements in strength and ductility of Al-Cu composites by introducing heterogeneous structures, including low-angle grain boundaries (LAGBs), stacking faults (SFs), and nano-CuAl₂. A high density of LAGBs refines Al grains by absorbing dislocation into high-angle grain boundaries (HAGBs) during deformation, which helps to suppress crack propagation under plastic deformation. The absorption of dislocations by LAGBs prevents dislocation pile-up at grain boundaries, thereby reducing stress concentration. The stacking fault network formed at the heterogeneous interface between Al and CuAl₂ effectively reduces the mean free path of dislocation motion, overcoming the Hall-Petch limit in microcrystalline grains. Nano-particles further contribute to Orowan strengthening by hindering dislocation motion. The synergistic effect of these heterogeneous structures successfully evades the strength-ductility trade-off in Al-Cu composites, providing an efficient strategy by multiscale defects to facilitate maintaining plasticity in metal-matrix composites. Employing multiscale defects provides an efficient strategy to maintain plasticity in metal-matrix composites.
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高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
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IF 6.044
Peibo Li,Jianian Hu,Tao Fang,Youlin Zhu,Yi Sun,Xiao Wang,Xuebin Yang,Qiang Shen,Guoqiang Luo
The objective of this study is to modulate the size of intermetallic compounds to increase the strength of Al–Ag composites. In this study, we prepared Al–Ag composites using plasma-activated sintering (PAS). The effect of the applied current on the nucleation barrier of the Al/Ag alloy phase was investigated. The strengthening mechanism of Ag-reinforced Al matrix composites was explored. We found that two alloy phases, Ag 2 Al and Ag 3 Al, were generated in the Al–Ag composites. The alloy phases distributed at the grain boundaries strengthened the Al–Ag composites by enhancing the dislocation density in the matrix and by impeding dislocation motion . The ultimate tensile strength and yield strength of the Al–7Ag composite increased by 60.1% and 166%, respectively, compared with those of pure Al. Moreover, we calculated the contribution of each strengthening mechanism to the overall yield strength. The applied current lowered the nucleation barrier of the alloy phase and facilitated the nucleation process.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Ying Wang,Tengfei He,Jingguo Cao,Ke Li,Chengqian Wang,Qun Liu,Yu Zhang
This study demonstrates a sustainable strategy for synthesizing MIL-53(Al) and ZSM-5 zeolite through dual-waste synergy using coal fly ash (CFA) and waste polyethylene terephthalate (PET). A sequential alkaline fusion-acid leaching protocol selectively fractionated CFA into aluminum-rich solutions and silica residues, while alkaline hydrolysis of PET liberated terephthalic acid (PTA) as organic ligands. The Al 3+ -PTA coordination under solvothermal conditions produced MIL-53(Al)(CFA-PET) exhibiting well-defined 1D rhombic channels with a high BET surface area (1303 m 2 ·g −1 ), whereas hydrothermal crystallization of silica residues yielded ZSM-5(CFA), which formed spherical aggregates composed of 100 nm nanosheets with 89.9 % yield and a surface area of 311 m 2 ·g −1 . Structural advantages were evidenced by exceptional adsorption performance: MIL-53(Al)(CFA-PET) achieved 96.24 % methylene blue removal at pH 7 (250 mg·L −1 ), outperforming rhodamine B (30.8 %) and methyl orange (66.4 %), as well as reagent-synthesized MIL-53(Al) Che (91.99 %). Both materials demonstrated exceptional CO 2 capture capacities (4.23 mmol·g −1 for MIL-53(Al)(CFA-PET) vs. 2.37 mmol·g −1 for ZSM-5(CFA) at 273 K/1 bar), attributable to MIL-53′s flexible framework enabling dynamic pore adjustment and ZSM-5′s rigid microporous channels favoring molecular sieving. This work establishes a closed-loop strategy for converting industrial and plastic wastes into functionally differentiated porous materials through element-targeted process design.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zhe Ni,Xiaolin Chen,Jie Yan,Jin Zhang,Zhou Yang,Dalong Yang,Renguo Guan
Graphene, due to its unique mechanical properties, thermal conductivity and electrical conductivity, is considered as a reinforcement for metal materials. However, there are still issues with graphene aggregation and weak bonding at the graphene/metal interface. In this study, in-situ reduction techniques by nascent hydrogen was used to reduce graphene oxide (GO), and reduced graphene oxide (rGO) coated the Al powder to prepare composite powder. The composite powder was pre-shaped into blocks by hot-press sintering and the interface bonding issue of rGO/Al was improved by multi-pass rolling processes. Raman spectroscopy and XPS were used to analyze the reduction of GO. SEM, HRTEM and EBSD were used to analyze the composition, structure, and morphology of composites. The mechanical properties of the composite materials were studied. The results showed that GO was reduced to that almost all oxygen-containing groups were removed and uniformly dispersed in the Al matrix. The microstructure of the composites was dense, with good metallurgical bonding, and no apparent defects or porosity. When the loading amount is below 0.20 wt%, the ultimate tensile strength ( UTS ), yield strength ( YS ), and Young's modulus ( E ) were increasing along with the increased rGO content. When the addition amount was 0.20 wt%, UTS (147.67 MPa), YS (126.83 MPa), and E (36506.37 MPa), of the rGO/Al composites increased by 51.89 %, 37.87 %, and 94.48 %, compared to pure Al produced using the same process.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Xuechao Liu,Chunyan Shi,Jiashuai Wang,Bingbing Fan,Mao Chen,Hailong Wang,Binbin Wang,Wei Li,Yongqiang Chen
There has been an increasing demand for cutting tools with excellent strength, and high wear resistance due to the gradual application of high hardness materials such as high-temperature alloys and surface thermal spray coatings. This study proposes a new design of binder for polycrystalline cubic boron nitride (PcBN) composites. The effects of Al-ZrB 2 -TiC binders on the microstructural evolution, mechanical properties, and thermal shock resistance of the PcBN composites were systematically studied. Al melting at its relatively low temperature, which enables liquid-phase sintering, enhances grain bonding, and stimulates chemical interactions among the binder constituents. These reactions lead to the formation of new phases and promote strong grain bonding, resulting in good mechanical properties. In addition, increasing sintering temperature and cBN content are found to significantly improve the mechanical properties of PcBN composites. The PcBN composites exhibit excellent bending strength of 986.55 MPa, hardness of 42.09 GPa, relative density of 97.6 %, and fracture toughness of 7.66 MPa m 1/2 , respectively. After exposure to air at 1000 °C for 30 min followed by water quenching, the residual flexural strength remained as high as 866.89 MPa, indicating good thermal shock resistance.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2026
·
IF 6.1
Xin Wang,Tianyu Zhang,Zihan Zhao,Wenlong Guo,An Du,Yong Wang,Ruina Ma,Yongzhe Fan,Xue Zhao,Xiaoming Cao
Zn-Al-Mg powder co-diffusion was performed on Q235 steel using a mechanical energy-assisted diffusion process. The resulting ZAM alloy diffusion coating comprised an inner Fe Zn layer composed of δ(FeZn 10 ) and Γ(Fe 11 Zn 40 ) phases, while the outer layer exhibited a multiphase structure distributed discontinuously in island-like or dot-like patterns on the δ-phase surface. The multiphase structure exhibits layered characteristics extending outward from the δ phase: an Al-rich layer composed of Al 2 O 3 and Fe Al phases; a Mg-rich layer interwoven with Mg Al phases, Mg Zn phases, and MgO; and an amorphous ZnO layer. The growth mechanism is investigated by this study, revealing that during the primary co-diffusion phase, a 20 μm Fe Zn layer formed first on the substrate. Subsequently, increased Al atoms combined with Fe atoms within the Fe Zn phase to form an Fe Al layer, thereby inhibiting Fe Zn layer growth. Finally, active Mg atoms form a Mg-rich layer on the surface of the Fe Al layer. Mg-rich layer combines with Al atoms to form a Mg Al phase and induces lattice distortion, thereby inhibiting Fe Al layer growth. Throughout the process, the removal of HCl exposes the Fe Zn layer and restores its normal growth. Eventually, under this dynamic mechanism, a complex, multi-phase outer structure is formed. The self-corrosion current (J corr ) of the ZAM diffusion coating (1.673 × 10 −5 A/cm 2 ) markedly lower than the ZA diffusion coating (5.499 × 10 −5 A/cm 2 ). While the ZAM diffusion coating exhibited a weight gain of 1.182 ± 0.075 mg/cm 2 after 120 h of oxidation at 500 °C, which was slightly higher than the ZA diffusion coating but considerably lower than Q235 steel.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Laigang Hu,Weiwei Wang,Ling Jiang,Jinru Hu,Hongxia Zhu,Mengxue Zhang,Jian Wu,Daohui Lin,Kun Yang
Exploring CO 2 adsorption under humid conditions is crucial for practical applications. Herein, ZJU-521(Al) was synthesized using low-toxicity helical secondary building units (SBUs, [Al 5 (OH) 7 (−COO) 8 ] ∞ ) and tetrakis (4-carboxyphenyl)methane (H 4 MTTB) ligand, with excellent chemical stability. Saturated CO 2 adsorption capacities of ZJU-521(Al) reach 6.19 mmol/g at 273 K and 4.52 mmol/g at 298 K, respectively, and moderate isosteric heat of 28.23 kJ/mol, enabling low-energy regeneration. Simulation results reveal two CO 2 adsorption sites on ZJU-521(Al): site I, located near the helical SBUs and interwoven with the helical SBUs, and site II, situated near the H 4 MTTB ligand. ZJU-521(Al) can effectively separate CO 2 from the CO 2 /N 2 mixture, as identified by the ideal adsorbed solution theory values of 28.81 at 273 K and 40.83 at 298 K for CO 2 /N 2 (15/85) mixture, respectively. Dynamic adsorption experiments reveal dynamic CO 2 adsorption of 0.59 mmol/g under dry conditions and 0.54 mmol/g at 80% relative humidity (RH) for ZJU-521(Al), highlighting its moisture-resistant behavior for CO 2 adsorption under humid conditions. Most adsorbed CO 2 is readily desorbed by argon purging at 14 min (dry) and 12 min (80% RH) at 298 K, respectively. Therefore, ZJU-521(Al) emerges as a promising candidate for efficient CO 2 adsorption, separation, and desorption even under humid conditions.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 1
·
IF 1.866
Zhaowei Wang,Zhixia Wen,Xing Li,Junwei Yu,Xiaoxuan Liu
The preparation of the high cis −1,4-polyisoprene by Ziegler-Natta catalysis system was studied. The effect of Al-Ti catalysts modified by ethers with different structures which are different electron donor reagent on polymerization of isoprene has been mainly investigated. By the measurement method of the monomer conversion, FTIR, and 1 H NMR spectroscopy, the influence of, respectively, added diphenyl ether, anisole, dibutyl ether, or methyl tert -butyl methyl ether as a third active component on the heterogeneous TiCl 4 -Al( i -Bu) 3 -ether catalyst activity and microstructure of synthetic polyisoprene was analyzed. By the adding of diphenyl ether or dibutyl ether, the process of prefabricated heterogeneous catalyst is quickly and catalyst particle quantity is large. The polymerization conversion is high and the microstructure cis −1,4 content of the resulting polymer can reach 92%. But Al( i -Bu) 3 added anisole or methyl tert -butyl methyl ether hard to cooperate with TiCl 4 . © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 44357.
研究领域:
高分子化学
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催化化学
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功能材料
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合成高分子
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配位聚合
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高影响因子
危险品化学品经营许可证（带存储）