Surface Topography-Metrology and Properties
·
2024
·Vol. 12
·期 1
·015005
·
IF 2
Jiaqi He,Huijian Li,Huajie Tang,Zihan Guo
Artificial intelligence algorithms including two artificial neural network and two machine learning algorithms were employed to predict the four-ball tribology behavior of MoS2-Al2O3 hybrid nanofluid. MoS2-Al2O3 composite nanoparticles were synthesized using solvothermal method and then dispersed in water-based fluids. 27 groups of tribology tests were conducted according to Box-Behnken experimental design were set as the training groups. The input variables (velocity of friction pairs, test force, test temperature, nanoparticle concentration) and output parameters (friction coefficient, wear scar diameter, wear surface roughness) were selected as the main variables. It was found that the random forest (RF) had better predict accuracy and stability for the four-ball tribology behavior of MoS2-Al2O3 nanofluid than multilayer perceptron (MLP), back propagation (BP) and k-nearest neighbors (KNN) algorithms. Besides, Pearson correlation analysis was carried out to reveal the relationship between input and output as well as different output variables. Through in-depth characterization of worn surface, a tribofilm in the thickness of 15 ∼ 20 nm composed of amorphous phases, ultra-fine nanoparticles and iron compounds was found. Finally, the lubrication mechanism of MoS2-Al2O3 nanofluid were discussed based on analyzing the tribology behavior data and tribofilm structure. Through the above findings, we hope to promote the application and development of artificial intelligence techniques in lubricants design and performance evaluation in the future.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xianggang Liu,Hui Chen,Yuxin Zhao,Jingjie Zhang,Xianglong Meng,Guangchun Xiao,Zhaoqiang Chen,Mingdong Yi,Wenyu Liu,Chonghai Xu
Al 2 O 3 /CaF 2 self-lubricating ceramic materials were prepared using a low-toxicity methylacrylamide gelcasting system. The rheological properties of the Al 2 O 3 slurry were analyzed to study the effects of dispersant content, solid loading, and pH on its flowability. Optimal results were achieved with a dispersant content of 0.5 wt%, a solid loading of 54 vol%, and a pH of 9. The relative density of the resulting green body was 56 %, with a strength of 18.2 MPa. After sintering for 2 h in a vacuum furnace at 1650 °C, the material exhibited a hardness exceeding 750 HV and a bending strength above 300 MPa when the CaF 2 content was less than 10 vol%. Additionally, the tribological properties of Al 2 O 3 /CaF 2 under various conditions were investigated, revealing optimal performance at a CaF 2 content of 10 vol%. The average friction coefficient and wear rate were 0.245 and 2.96 × 10 −5 mm 3 /N⋅m, respectively, representing reductions of 48 % and 54 % compared to pure Al 2 O 3 materials. These findings demonstrate that gelcasting is an effective method for preparing self-lubricating ceramic materials, offering a new approach for fabricating complex-shaped self-lubricating ceramic components.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yue Fan,Wenbo Chao,Cailin Liu,Shudong Lin
Styrene-divinylbenzene copolymer (SDB) was an important hydrophobic catalyst carrier for hydrogen-water liquid-phase catalytic exchange (LPCE) technology. In this paper, nano-Al 2 O 3 was hydrophobically modified with 1 H, 1 H, 2 H, 2 H-perfluorodecyltrimethoxysilane (HFTMS) and 1 H, 1 H, 2 H, 2 H-perfluorooctyltriMethoxysilane (PFOTMS), giving HFTMS-Al 2 O 3 and PFOTMS-Al 2 O 3 . In order to improve the hydrophobicity and strength of SDB carrier, HFTMS-Al 2 O 3 and PFOTMS-Al 2 O 3 were respectively doped into SDB by suspension polymerization , providing modified SDB carriers HFTMS-Al 2 O 3 /SDB and PFOTMS-Al 2 O 3 /SDB. Results show that the modified carriers have a specific surface area of 434.613 m 2 /g and 423.017 m 2 /g, a hydrophobic angle of 146.94° (close to super-hydrophobic) and 138.25° (strongly hydrophobic), a compressive strength of 91.6 N and 50.7 N, and a better stability of hydrophobic property than SDB. Generally, the modified SDB carriers have very good hydrophobicity and compressive strength , which could be used for tritiated wastewater treatment .
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POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Hongsheng Xu,Hankun Lv,Wenbin Ye,Yanbei Hou,Fukai Chu,Weizhao Hu,Lei Song,Yuan Hu
Low-pressure environments significantly compromise the performance of conventional intumescent flame-retardant systems by accelerating ignition and inducing excessive yet fragile char expansion, which easily cracks and compromises its protective function. To overcome these challenges, MXene has attracted considerable attention due to its ability to promote char layer formation and serve as an effective physical barrier. In this work, a novel flame-retardant PE composite was developed by incorporating a silane-coupling-agent-modified Al 2 O 3 -supported MXene nanohybrid (MXene@Al 2 O 3 ). The nanohybrid exhibited uniform morphology, strong interfacial bonding, and excellent dispersion within the PE matrix, significantly reducing the fire risk of PE under sub-atmospheric conditions. With only 1 wt% of MXene@Al 2 O 3 , the composite achieved a 26.9 % and 31.8 % reduction in peak heat release rate and total heat release, respectively, along with a 25.9 % decrease in maximum smoke density and significant suppression of carbon monoxide evolution. Under reduced pressures (55–99 kPa), the system formed more graphitized and compact char layers, demonstrating enhanced thermal stability and suppressed volatile release. Mechanistic insights obtained via synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS) revealed a shift from oxygen-driven oxidation to condensed-phase carbonization under low pressure. These improvements are attributed to the early char templating and barrier-forming capabilities of MXene, while Al 2 O 3 contributes by catalyzes carbonization reactions and suppresses smoke precursors. This work demonstrates a pressure-adaptive flame-retardant strategy for polyolefin materials and offers theoretical guidance for designing next-generation nanohybrid flame-retardant systems for sub-atmospheric pressure environments.
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China Foundry
·
2025
·
IF 2.3
Zhai Xiao-fei,Chen Jing-yi,Zhang Xue-qin,Qian Yuan-hong,Chen Rong,Zhang Wei,He Ru-jie
The complex ceramic core used for hollow turbine blades requires a high porosity and a high flexural strength. For a better balance between porosity and flexural strength, ceramic materials with porous structures are preferred. In order to achieve the transition from disordered pore formation to ordered pore formation, Al 2 O 3 ceramic cores with triply periodic minimal surface (TPMS) micro lattice structures with different structural configurations (gyroid, diamond, and neovius) and different volume fractions of lattice structures (30, 40, and 50, vol.%) were designed and prepared by vat photopolymerization 3D printing. The effects of structural configuration and volume fraction of the lattice structure on the following structural shrinkage, microstructure, and flexural strength were investigated. The shrinkage relationship of the three lattice configurations is: neovius>diamond>gyroid. Besides, it is found that with an increase in the volume fraction of the 3D printed Al 2 O 3 ceramic micro lattice structures, their flexural strength correspondingly increases ranging from 54.95 MPa to 139.1 MPa. The maximum average flexural strength of the 3D printed Al 2 O 3 ceramic micro lattice structures is obtained when the structural configuration is diamond and with a volume fraction of 50vol.%, which is 139.1 MPa. Even when the volume fraction of the lattice structure is 30vol.%, that is to say the porosity is 70%, the flexural strength is as high as 50–70 MPa, which can still be maintained at a high level. In addition, when the volume fraction of the lattice structure is a certain value, the sample with diamond configuration has a higher strength. The internal pore morphology, pore size, and porosity of the cores are precisely controlled, achieving both a high porosity and a high strength. Therefore, this study maintains high porosity and high strength simultaneously, providing a new lattice structure design idea for 3D printed ceramic cores.
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ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Xinwei Geng,Yongfeng Xia,Ming Zhu,Jun Zhao,Dongxu Yao,Yu-Ping Zeng
Ti 4 O 7 is one of the most promising electrically functional materials among the Magnéli phase. To further broaden its applications in areas such as battery electrodes and pollutant treatment, extensive research has been conducted to optimize its mechanical and electrical properties. In this study, Ti 4 O 7 ceramics, as well as Al 2 O 3 and Ta 2 O 5 -doped Ti 4 O 7 ceramics, are fabricated via hot-press sintering using a solid-state method. While the introduction of secondary phases did not result in a significant improvement in the mechanical properties of Ti 4 O 7 ceramics, the effectiveness of Al–Ta co-doping in enhancing electrical conductivity is validated through three commonly used measurement techniques: the Van der Pauw method, the two-probe method, and the four-probe method, yielding conductivity increases of 46.20, 1.98, and 17.98%, respectively. Detailed electrical characterization further elucidated the electrical features of polycrystalline Ti 4 O 7 ceramics and effect of doping. Furthermore, the reaction between Ti 4 O 7 and Ta 2 O 5 , leading to the formation of the ternary oxide TiTaO 4 , is observed.
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Chemical Engineering and Processing-Process Intensification
·
2020
·
IF 3.731
Lan Jiang,Guang-Wen Chu,Ya-Zhao Liu,Wei Liu,Li-Xiong Wen,Yong Luo
A rotating packed bed (RPB) reactor with excellent mass transfer performance can be applied for catalytic reactions. However, the structure of catalyst particles randomly inside the rotor of the RPB reactor was easily deformed under the centrifugal field. In this work, a cordierite (COR) monolithic catalyst with high mechanical strength was prepared, aiming to be used in the RPB reactor for hydrogenation. The acid pretreatment and Al 2 O 3 coating were employed to increase the specific surface area of COR substrate. Active component palladium (Pd) was deposited on Al 2 O 3 /COR. Hydrogenation of α-methylstyrene (AMS) was selected as a model reaction for the RPB reactor with the above Pd/Al 2 O 3 /COR. Experimental results show that the space time yield (STY) in the RPB reactor was effectually enhanced 9.2 times higher than that in the fixed bed reactor at the operation conditions of 30 °C and 0.2 MPa, which shows potential prospects of the RPB reactor with Pd/Al 2 O 3 /COR monolithic catalyst for the process intensification of catalytic reaction.
研究领域:
化学工程
·
催化反应
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Tian-Hao Xu,Xiang-Yu Meng,Song Shen,Guo-Chao Mo,Ping Shen
Inspired by natural hierarchical structures, this study presents a novel biomimetic Al/Al 2 O 3 composite featuring a gradient-heterogeneous architecture that effectively addresses the long-standing strength–toughness trade-off in metal–ceramic systems. A high-resolution vat photopolymerization 3D printing process was used to fabricate complex ceramic scaffolds with a multi-scale design, incorporating a turtle shell-inspired gradient in porosity and wall thickness, along with layered, tubular, and hexagonal cellular units derived respectively from nacre, ram horns, and beehives. Through pressure infiltration of molten aluminum, a fully interpenetrating composite with strong interfacial bonding was achieved. The resulting material exhibits a spatially tailored gradient in mechanical properties, achieving a surface strength of 634 MPa and a core energy absorption capacity of 14.36 MJ/cm 3 . In situ mechanical testing and finite element analysis reveal that multi-scale synergistic toughening mechanisms—including architecture-guided crack deflection, distributed plastic deformation, and stress redistribution—collectively contribute to the enhanced performance. This work demonstrates the potential of additive manufacturing-enabled structural programming to engineer composites with spatially optimized mechanical properties, offering a new paradigm for the design of advanced structural materials.
研究领域:
材料科学
·
复合材料
·
增材制造
·
机械工程
·
断裂力学
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SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Xiafeng Wan,Ximing Duan,Pengfei He,Shujun Hu,Lin Xue,Liliang Shao,Chuan Sun,Bo Zhang,Jiangbo Cheng,Xiubing Liang
This study investigates the influence of Al 2 O 3 -20wt%TiO 2 (AT) modification on the hot corrosion resistance of YSZ coating. The YSZ coating, YSZ-AT composite coating, and YSZ/AT double layer coating were prepared using plasma spraying. An innovative dynamic corrosion method was conducted by plasma spraying NaCl under a heat flux density of 3350 kW/m 2 for 60 s, and the peak surface temperatures during corrosion exceeded 1500 °C during corrosion The results revealed that the YSZ coating suffered structural damage due to molten salt infiltration after corrosion, exhibiting a mass increase of 2.14 mg/cm 2 . In contrast, the composite coating exhibited the most severe damage due to the depletion and spalling of the AT phase, with a significant mass loss of 18.46 mg/cm 2 . However, the YSZ/AT double layer coating retained its structural integrity, experiencing only a moderate mass loss of 6.6 mg/cm 2 . The dense AT top layer (initial porosity about 0.378 %) effectively prevented molten salt penetration and acted as a sacrificial coating, reacting with the molten salt to consume corrosive media, thus demonstrating the best hot corrosion resistance.
研究领域:
材料科学
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腐蚀工程
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热障涂层
·
表面工程
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IONICS
·
2020
·Vol. 26
·期 5
·2147-2156
·
IF 2.394
Wang Hongqiang,Yang Guangchang,Lai Feiyan,Chu Youqi,Zhang Xiaohui,Ma Zhaoling,Li Qingyu
Ni-rich oxide materials suffer poor rate capability and rapid capacity fading, which seriously hinder its further commercialization. In this study, an ultrathin Al 2 O 3 coating layer on surface of the LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM) material was prepared with Al(OC 4 H 9 ) 4 in organic medium; the process followed by heat treatment achieves Al doping. The synergistic effect of surface modification and Al doping significantly enhances the capacity retention and rate performance, while the resistance to moisture is also improved. The coated sample with 2wt% Al 2 O 3 shows superior electrochemical performances with an initial capacity of 175 mAh g −1 at 1 C and a retention of 80% after 500 cycles, which is 10% higher than the uncoated raw materials. In addition, it delivers 152 mAh g −1 at 10 C, suggesting an excellent rate capability. The substitution of Al 3+ and the Al 2 O 3 protective layer facilitates ion diffusion dynamic characteristic and improves electrochemical stability.
研究领域:
材料科学
·
能源存储技术
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 8
·5167-5177
·
IF 4.186
Ruili Zhang,Delong Ma,Jianrong Wang,Yang Chen,Xun Hu
A detailed structural investigation of a series of phosphate laser glasses with composition x Bi 2 O 3 – y Al 2 O 3 –(100 − x – y )NaPO 3 ( x = 0, 10; y = 0, 5, 10, 15, 20) has been conducted using solid-state nuclear magnetic resonance (NMR) techniques and X-ray photoelectron spectroscopy (XPS). 31 P MAS NMR spectroscopy demonstrates that the addition of Bi 2 O 3 and Al 2 O 3 leads to the depolymerization of the phosphorus chain in the process of Q 2 → Q 1 → Q 0 . The various phosphorus species (Q n , n = 0, 1, 2) are identified by 31 P single pulse, 31 P{ 27 Al} rotational echo adiabatic passage double resonance, 31 P{ 27 Al} J-coupling-based heteronuclear multiple-quantum coherence, and 1D refocused INADEQUATE experiments. The results of 23 Na{ 31 P}, 31 P{ 23 Na}, 27 Al{ 31 P} rotational echo double resonance, and XPS consistently confirm that Na + , Al 3+ , and Bi 3+ ions are all bound by phosphorus tetrahedron [PO 4 ] 3− . No bond is formed between these glass modifiers. Based on the complementary evidence from previous experiments, comprehensive local structure models are developed for these Bi 2 O 3 –Al 2 O 3 –NaPO 3 glasses.
研究领域:
材料科学
·
固体物理学
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Frontiers of Environmental Science & Engineering
·
2021
·Vol. 15
·期 6
·1-12
·
IF 4.357
Meng Fanling,Xia Yunxue,Zhang Jianshuai,Qiu Dong,Chu Yaozhu,Tang Yuanyuan
Chromium slag usually contains various heavy metals, making its safe treatment difficult. Glass-ceramic sintering has been applied to resolve this issue and emerged as an effective method for metal immobilization by incorporating heavy metals into stable crystal structures. Currently, there is limited knowledge about the reaction pathways adopted by multiple heavy metals and the co-stabilization functions of the crystal structure. To study the Cu/Cr co-stabilization mechanisms during thermal treatment, a simulated system was prepared using a mixture with a molar ratio of Al 2 O 3 :Fe 2 O 3 :Cr 2 O 3 : CuO = 1:1:1:3. The samples were sintered at temperatures 600–1300°C followed by intensive analysis of phase constitutions and microstructure development. A spinel phase (CuFe x Al y Cr 2− x − y O 4 ) started to generate at 700°C and the incorporation of Cu/Cr into the spinel largely complete at 900°C, although the spinel peak intensity continued increasing slightly at temperatures above 900°C. Fe 2 O 3 /Cr 2 O 3 was more easily incorporated into the spinel at lower temperatures, while more Al 2 O 3 was gradually incorporated into the spinel at higher temperatures. Additionally, sintered sample microstructures became more condensed and smoother with increased sintering temperature. Cu / Cr leachability substantially decreased after Cu/Cr incorporation into the spinel phase at elevated temperatures. At 600°C, the leached ratios for Cu and Cr were 6.28% and 0.65%, respectively. When sintering temperature was increased to 1300°C, the leached ratios for all metal components in the system were below 0.2%. This study proposes a sustainable method for managing Cu/Cr co-exist slag at reasonable temperatures.
研究领域:
环境科学
·
材料科学
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