Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Yunjia Hu,Renli Fu,Zeya Huang,Meng Meng,Jindan Tian,Xing Gao,Yunan Liu
This study developed a soldering process for joining Al to Cu-metallized ceramic substrates, aiming to overcome the formation of brittle intermetallic compounds in Sn-based solders, which usually lead to low joint strength. Zn foils coated with Sn-10Zn or Sn-20In solders were used as hybrid solders to bond Ni-plated Al components to Cu-metallized Al 2 O 3 substrates at 220 °C. With increasing soldering time, the solder on the Zn surface gradually transformed into NiZn 3 , and the formation mechanism of the NiZn 3 phase was analyzed from thermodynamic and kinetic perspectives. The shear strength of the joints increased with prolonged soldering times, reaching a maximum of 67 MPa for the Sn-10Zn/Zn solder at 240 min. In the Sn-10Zn joints, NiZn 3 formed a continuous transition layer that effectively reduced stress concentration. In contrast, the Sn-20In/Zn joints showed discontinuous NiZn 3 layers and significant interfacial stress, resulting in lower shear strength.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiongying Wu,Fuyu Li
As microwave communication technology advances toward higher frequencies, greater integration, and enhanced adaptability to extreme environments, dielectric materials are required to balance the “ ε r - Q × f - τ f ” parameters. The influence and mechanisms on the phase, microstructure, and microwave dielectric properties of Al-doping LaBO 3 ceramics are systematically investigated. The LaB 1- x Al x O 3 (0≤ x ≤ 0.08) ceramics were synthesized via the solid-state reaction method. Through first-principles calculations and characterization techniques (XRD, SEM, Raman spectroscopy), the optimization mechanism of Al doping on the microwave dielectric properties of LaBO 3 ceramics has been successfully elucidated. The results indicate that the addition of Al 3+ promotes the formation of LaAlO 3 second phase. This process significantly enhances the densification and grain growth of the ceramic. The best microwave dielectric properties achieved are: ε r = 13.4, Q × f = 78991 GHz, τ f = −26.5 ppm/°C. This work elucidates the physical mechanism by which Al doping synergistically optimizes the microwave dielectric properties of LaBO 3 ceramics through multiple mechanisms.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 15
·1203
·
IF 3.2
Zhang Xiaoru,Luo Laima,Song Jing,Han Mingming,Sun Hongqian,Cao Lei,Wu Yucheng
A solvent-free strategy combining dry ball milling and calcination is developed to fabricate an Al-Y co-doped ZrO 2 (Al-YSZ) coating on LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) cathodes. Structural characterizations confirm Al-YSZ induces NCM811 lattice expansion (unit cell volume + 0.00026 nm 3 ) and reduces cation mixing ( I (003) / I (104) = 1.621). TEM shows a ~ 50 nm coating with intimate matrix contact. Electrochemically, it delivers 218.9 mAh/g at 0.1 C (21.7% higher than pristine), retains 161.5 mAh/g after 200 cycles at 1 C, and exhibits superior stability under 4.5 V (137.3 mAh/g after 200 cycles), 45 ℃ (64.5% retention), and 5 C (86.0% retention). Mechanisms involve enhanced interfacial stability, optimized Li + kinetics (diffusion coefficient 2.21 × 10 −12 cm 2 /s after cycling), and mitigated structural degradation. This scalable green strategy advances high-nickel cathode optimization.
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APPLIED THERMAL ENGINEERING
·
2026
·
IF 7.5
Sen Liu,Mi Li,Zhanjun Yang,Matko Erceg,Lin Jiang
Inert silica is repurposed as a potent modifier for Al-Mg/AP energetic composites. • 5 wt% SiO 2 reduces ignition delay by 35% and increases maximum flame area by 226%. • Optimal SiO 2 loading boosts pressurization rate by 126% in closed vessel tests. • 9 wt% SiO 2 reduces AP decomposition activation energy by 78 kJ/mol. Silica (SiO 2 ) is generally regarded as a chemically inert and low-cost material that is widely present in natural minerals and daily life. In conventional energetic formulations, SiO 2 is rarely considered an active component because of its high thermodynamic stability and low thermal conductivity. Herein, we demonstrate that mesoporous SiO 2 can serve as an effective reactive additive in Al-Mg/ammonium perchlorate (AP) energetic composites, participating in high-temperature aluminothermic reactions and regulating the overall energy-release behavior of the system. In this work, AP/SiO 2 precursor particles were prepared by spray drying, followed by solvent-assisted assembly with Al Mg alloy powder to obtain Al-Mg/(AP/SiO 2 ) composite energetic materials with different SiO 2 contents. The morphology, phase structure, combustion behavior, pressure output, thermal decomposition characteristics, evolved gaseous products, and post-combustion residues were systematically investigated using SEM, EDS, XRD, high-speed imaging, infrared thermography, closed-bomb pressure testing, TG-DSC, and TG-IR analyses. The results reveal that the introduction of mesoporous SiO 2 markedly alters the decomposition behavior of AP, promotes gas evolution, enhances ignition and combustion propagation, and modifies the condensed-phase reaction pathway of the Al-Mg/AP system. These effects are attributed to the combined roles of mesoporous confinement, surface silanol-assisted AP decomposition, local hotspot formation, and the participation of SiO 2 in aluminothermic reactions. This study provides new insight into the unconventional role of inert oxides in energetic combustion systems and offers a low-cost strategy for designing alternative multifunctional reactive additives and regulating energy-release mechanisms in metal-based energetic materials. Download: Download high-res image (182KB) Download: Download full-size image
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Environmental Science-Nano
·
2025
·
IF 5.1
Heping Chen,Hang Zhang,Xiaojian Wang,Wenjie Luo,Jialin Zheng,Kang Liu,Junwei Fu,Hongmei Li,Zhang Lin,Liyuan Chai,Nan Hu,Min Liu
Aluminum (Al)-based catalysts are the most widely used materials for CF4 catalytic hydrolysis, where three-coordinated Al (AlIII) active sites play a pivotal role in C–F bond activation. The limited proportion of AlIII active sites in conventional Al-based catalysts suppresses their catalytic activity, thereby requiring high temperatures to achieve complete CF4 decomposition. In this work, we developed a Co-modified strategy to enhance CF4 hydrolysis performance by increasing the proportion of AlIII active sites. Structure characterization revealed that Co modification significantly raised the proportion of AlIII sites from 2% (pure Al2O3) to 13%. Temperature-programmed desorption (TPD) analysis showed that the 0.1Co/Al2O3 catalyst exhibits a CF4 adsorption capacity that is 2.0 times higher than that of unmodified Al2O3. Furthermore, in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) detected a 2 cm−1 red shift in the characteristic C–F bond peaks on the 0.1Co/Al2O3 catalyst, indicating enhanced C–F bond activation. As a result, the 0.1Co/Al2O3 catalyst achieved 100% CF4 decomposition at 580 °C for over 170 hours, significantly outperforming pure Al2O3 (58% and 20 hours). This work opens up a new approach for developing highly efficient catalysts for CF4 hydrolysis at low temperatures.
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Fuels
·
2025
·Vol. 6
·期 4
·76
·
IF 2.8
Jun Hu,Hongyang Yu,Yanan Wang
The chemical looping steam reforming of methane (CLSR) employing Fe-containing oxygen carriers can produce syngas and hydrogen simultaneously. However, Fe-based oxygen carriers exhibit low CH4activation ability and cyclic stability. In this work, oxygen carriers with fixed Fe content and different Fe/Ni ratios were synthesized by the sol–gel method to investigate the effects of Ni-Fe-Al interactions on CLSR performance. Ni-Fe-Al interactions promote the growth of the spinel structure and regulate both the catalytic sites and the available lattice oxygen, resulting in the CH4conversion and CO selectivity being maintained at 96–98% and above 98% for the most promising oxygen carrier, with an Fe2O3content of 20 wt% and Fe/Ni molar ratio of 10. The surface, phase, and particle size were kept the same over 90 cycles, leading to high stability. During the CLSR cycles, conversion from Fe3+to Fe2+/Fe0occurs, along with transformation between Ni2+in NiAl2O4and Ni0. Overall, the results demonstrate the feasibility of using spinel containing earth-abundant elements in CLSR and the importance of cooperation between oxygen release and CH4activation.
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高影响因子
Arabian Journal of Chemistry
·
2015
·
IF 3.725
Shifeng Li,Yanming Shen,Min Xiao,Dongbin Liu,Lihui Fan
Controlled release formulations have been proven to have potential in overcoming the drawbacks of conventional plant growth regulators. Novel controlled-release formulation of β -naphthoxyacetic acid (BNOA) intercalated MgAl-layered double hydroxides (LDHs) was prepared by co-precipitation method. The effects of temperature, pH value, and release medium on BNOA release were studied and the releasing mechanisms were discussed. The results of release show that the increase of temperature induces the increase of BNOA release extent. The release rate and accumulated release amount of BNOA are found to be dependent to the anion in the aqueous solution in the order of CO 3 2− > SO 4 2− > Cl − . Moreover, the pH is the key controlling factor for the BNOA release processes, and with strong acid medium, the release character of BNOA is different from those at pH 7 and 12, which accompanies with fast collapse of LDHs nanolayered structure. The nanohybrid of BNOA intercalated LDHs possessed good controlled release properties and the BNOA release character from the nanohybrid fitted pseudo-second-order model in neutral medium.
研究领域:
材料科学
·
农业科学
·
植物生理学
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Peize Lyu,Wenzhao Sun,Bo Yang,Wanqi Chen,Ruolan Tang,Haile Yan,Zongbin Li,Song Li,Liang Zuo
Magnéli-phase Ti 4 O 7 exhibits broadband photothermal conversion but suffers from rapid oxidation to optically inactive TiO 2 , severely restricting its deployment in high-temperature solar-thermal systems. Here, we demonstrate that Al doping provides an effective dual-function strategy to simultaneously enhance the oxidation resistance and optical stability of Ti 4 O 7 while maintaining its intrinsic photothermal performance. Al-doped Ti 4 O 7 powders (0–10 at. %) were synthesized via hydrogen reduction, and their structural evolution, oxidation kinetics, and spectral responses were systematically evaluated under controlled oxidative environments (300–500 °C, 2–10 h). Al 3+ incorporation induces lattice distortion and electronic localization, which increase oxygen migration barriers and suppress electron-assisted oxidation. During annealing, Al–O–Ti species progressively transform into Al–O–Al–enriched surface layers, forming a robust diffusion barrier that significantly retards the Ti 4 O 7 → TiO 2 conversion. As a result, the 10 at. % Al-doped sample retains a high solar absorptance of 95.8% after 400 °C/10 h oxidation, outperforming undoped Ti 4 O 7 (92.2%). Moreover, controlled oxidation produces Ti 4 O 7 @TiO 2 core–shell structures with statistically enhanced near-infrared absorption arising from multiple interfacial reflections and scattering–induced phase accumulation. Kinetic analysis confirms reduced oxidation rates and increased activation barriers across the full temperature window. These results establish Al-doped Ti 4 O 7 as a durable, thermally stable photothermal material suitable for solar selective absorbing coatings, concentrated solar power receivers, and other high-temperature chemical engineering processes requiring long-term optical and structural robustness.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 16
·6792-6806
·
IF 3.5
Li Junguo,Yang Xuebin,Li Peibo,Zhang Yang,Luo Guoqiang,Shen Qiang,Sun Yi
Owing to inadequate interface contact between carbon and aluminum, enhancing the Al/C interface is crucial for the fabrication of high-performance Al matrix composites. This study selected polyvinyl butyral (PVB) with excellent dispersion properties as the carbon source, simultaneously introducing silver to achieve synergistic reinforcement between silver and carbon in Al matrix composites, offering a novel reinforcement approach for Al matrix composites. The Al–16Ag–C composite is fabricated through the in situ pyrolysis of PVB followed by hot-pressing sintering. Subsequently, the effect of temperature on the microstructural evolution and mechanical properties of the composite is investigated. Microstructural characterization demonstrates the formation of two alloy phases, namely Ag 2 Al and Al 4 C 3 , within the Al–16Ag–C composite. The alloy phases, distributed at the grain boundaries, enhance the material’s strength by impeding dislocation motion, increasing dislocation density within the matrix, and limiting grain growth. The Al–16Ag–C composite, sintered at 630 °C, exhibits a remarkable ultimate tensile strength of 481 MPa and an elongation of 16.84%, representing a significant enhancement compared to pure Al.
研究领域:
材料科学
·
机械工程
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HIGH PRESSURE RESEARCH
·
2012
·
IF 0.778
Yu Li,Zili Kou,Haikuo Wang,Kaixue Wang,Hongchang Tang,Yanfei Wang,Shenzhuo Liu,Xiangting Ren,Chuanming Meng,Zhigang Wang
The sintering behavior and mechanical properties of cubic boron nitride (cBN) composites, using the mixture of cBN–Ti3Al and cBN–Ti3Al-Al as the starting material respectively, were investigated under high pressure and high temperature (HPHT) conditions. The results show that the samples of cBN–Ti3Al-Al sintering system have more homogeneous microstructures. Young's modulus, shear modulus, and bulk modulus of samples measured by ultrasonic measurements can reach to 782±3 GPa, 344±1 GPa, and 348±2 GPa, respectively. The hardness increases remarkably with the sintering temperature rising, and reaches to the highest value of 35.04±0.51 GPa. For the cBN–Ti3Al sintering system, the X-ray diffraction patterns of composites reveal that the chemical reactions between cBN and Ti3Al occurred at 5.0 GPa and 1300°C. The reaction mechanisms of both cBN–Ti3Al and cBN–Ti3Al-Al sintering systems are discussed in this paper.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Shuyang Shi,Baozhong Ma,Ding Zhao,Xiang Li,Shuang Shao,Chengyan Wang,Yongqiang Chen
The new process ‘coal gangue/fly ash – HNO 3 pressure leaching (NAPL) –low-temperature pyrolysis’ was proposed by our team, which aimed to achieve the transformation of coal-based solid wastes from harmless to Al resource. For cost control, the regeneration of HNO 3 at a low cost was crucial for the process. Following NAPL of coal gangue and fly ash, massive amounts of Al(NO 3 ) 3 ·9 H 2 O were collected, with a decomposition temperature as low as 523 K. The energy consumption for low-temperature pyrolysis could be supplied by the combustion of residual carbon (6.96 wt%) during the thermal activity of coal gangue, allowing HNO 3 to be regenerated and recycled without extra heat supply . However, little research has been done on the pyrolysis behavior and kinetics of Al(NO 3 ) 3 ·9 H 2 O, which was examined in this study. The pyrolysis characteristics of Al(NO 3 ) 3 ·9 H 2 O were assessed by TG-DSC analysis. Further experiments and XRD/FTIR/MS analysis revealed that phase evolution of Al(NO 3 ) 3 ·9 H 2 O followed the sequence of Al(NO 3 ) 3 ·9 H 2 O→ Al(NO 3 ) 3 ·nH 2 O→ Al(NO 3 ) 3 ·3Al(OH) 3 ·5/2 H 2 O→ AlOOH→ Al 2 O 3 . Subsequently, the thermodynamic (∆ G , ∆ H , ∆ S ) and kinetic ( E a , A ) parameters were calculated based on the thermogravimetric data by the iso-conversional methods. And the mechanism models and functions were identified via the Malek method. Finally, the economic evaluation of pyrolysis indicated that 5.04 × 10 –3 Nm 3 of natural gas was consumed during pyrolysis of one mole Al(NO 3 ) 3 ·9 H 2 O, equivalent to 44.33 $ per ton of Al 2 O 3 . As a basic research of Al(NO 3 ) 3 ·9 H 2 O pyrolysis, this paper enhances related theories of the NAPL process.
研究领域:
材料科学
·
热工工程
·
无机化学
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废弃物资源化
·
过程工程
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高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Qian Luo,Runyu Wang,Kai Lu,Hang Liu,Guocai Yuan,Juncheng Ding,Xiaobo Lei,Ruonan Min,Qinyong Zhang,Lihong Huang
PbSe has attracted significant attention as a medium-temperature thermoelectric (TE) material due to its abundance and low cost. This study demonstrate that in the novel thermoelectric system of Al x Pb 0.9975 Sb 0.0025 Se samples ( x = 0, 0.005, 0.01, 0.02, and 0.03), the electronic conductivity of pure PbSe was enhanced by Sb doping. Introducing a small amount of Al to occupy the Pb vacancies not only increases the Hall carrier concentration in PbSe, but also resulting in an increase in Seebeck coefficient ( S ). At 873 K, the power factor ( PF ) of the sample with x = 0.02 increases to 16 μW cm −1 K −2 . In addition, the total thermal conductivity did not increase significantly, so the thermoelectric performance was effectively improved, a maximum figure of merit ( ZT ) of 1.8 is achieved at 873 K, along with a high average ZT ( ZT avg ) of approximately 1 over the temperature range of 300–873 K.
研究领域:
材料科学
·
热电学
·
能量转换
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危险品化学品经营许可证（带存储）