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Published Research PapersFiltered: Year 2025 • Vol. 32 • Issue 2

Showing 13 of 153 peer-reviewed papers with full Graphical Abstracts.

Original ResearchVol. 32, Issue 2 • pp. 433-445DOI: 10.1007/s11771-025-5963-x• Feb 23, 2025

Microstructure and mechanical properties of novel SiC-TiC/Al-Mg-Sc-Zr composites prepared by selective laser melting

Authors: LU Ren-yi, MA Guo-nan, BAI Guan-shun, ZHAO Wen-tian, ZHANG Hui-hua, ZHAO Shu-ming, ZHUANG Xin-peng

In order to obtain high-density dual-scale ceramic particles (8.5 wt.% SiC+1.5 wt.% TiC) reinforced Al-Mg-Sc-Zr composites with uniform microstructure, 50 nm TiC and 7 μm SiC particles were pre-dispersed into 15−53 μm aluminum alloy powders by low-speed ball milling and mechanical mixing technology, respectively. Then, the effects of laser energy density, power and scanning rate on the density of the composites were investigated based on selective laser melting (SLM) technology. The effect of mi

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Microstructure and mechanical properties of novel SiC-TiC/Al-Mg-Sc-Zr composites prepared by selective laser melting

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Original ResearchVol. 32, Issue 2 • pp. 841-853DOI: 10.1007/s11771-025-5997-0• Feb 20, 2025

Enhanced permeability mechanism in coal seams through liquid nitrogen immersion: multi-scale pore structure analysis

Authors: LI Xue-long, CHEN De-you, LIU Shu-min, WANG Deng-ke, SUN Hai-tao, YIN Da-wei, ZHANG Yong-gang, GONG Bin

The geological structure of coal seams in China is remarkably varied and complex, with coalbed methane reservoirs marked by significant heterogeneity and low permeability, creating substantial technical challenges for efficient extraction. This study systematically investigates the impact of liquid nitrogen immersion (LNI) on the coal’s pore structure and its mechanism of enhancing permeability with a combination of quantitative nuclear magnetic resonance (NMR) analysis, nitrogen adsorption expe

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Enhanced permeability mechanism in coal seams through liquid nitrogen immersion: multi-scale pore structure analysis

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Original ResearchVol. 32, Issue 2 • pp. 213-225DOI: 10.1007/s11771-025-5878-6• Feb 18, 2025

Undercutting mechanism of worm wheel in offsetting normal arc-toothed cylindrical worm drive

Authors: MENG Qing-xiang, JIAO Yu-ge, ZHAO Ya-ping, MU Shi-bo, CUI Jian, ZHANG Ming-hua

The worm wheel whose undercutting characteristic is researched is a member of offsetting normal arc-toothed cylindrical worm drive. The tooth profile of the worm in its offsetting normal section is a circular arc. The normal vector used to calculate the first-type limit function is determined in the natural frame without the aid of the curvature parameter of worm helicoid. The first-type limit line is ascertained via solving the nonlinear equations iteratively. It is discovered that one first-ty

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Undercutting mechanism of worm wheel in offsetting normal arc-toothed cylindrical worm drive

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Original ResearchVol. 32, Issue 2 • pp. 449-461DOI: 10.1007/s11771-025-6016-1• Feb 17, 2025

Characteristics of stress thresholds of granite after triaxial dynamic impact treatment

Authors: PENG Kang, LIU Xu, YIN Xu-yan, ZHANG Yun, CHANG Yang-kai, LUO Song

The geostress and rock blasting in underground engineering may greatly affect the stress thresholds of surrounding rock. In this study, pre-damage impact tests were first conducted on granite under varying confining pressures (5, 10 and 15 MPa) and numbers of impacts (1, 5, 10 and 15 impacts). Then, uniaxial compression tests were undertaken on the pre-damaged granite to study the evolution of stress thresholds using the crack volume strain method and acoustic emission method. The crack damage stresses determined by the two methods were compared. Additionally, based on the rise time amplitude and average frequency, the evolution law of microcracks inside rock specimens was revealed, and an improved acoustic emission method was proposed. The results indicated that as the number of impacts increased, the crack closure stress, crack damage stress, and peak stress of granite specimens initially rose and then declined, while they continuously increased with the confining pressure. The proportion of shear cracks first declined and then rose with greater number of impacts and decreased with higher confining pressure, and that of tensile cracks showed the opposite trend. The improved acoustic emission method was more accurate in identifying the crack damage stress.

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Characteristics of stress thresholds of granite after triaxial dynamic impact treatment

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Original ResearchVol. 32, Issue 2 • pp. 621-633DOI: 10.1007/s11771-025-5929-z• Feb 15, 2025

Microstructure and mechanical properties of additively manufactured FeCoCrMnNi high-entropy alloy composite after aging

Authors: MA Pan, YANG Hong, ZHANG Zhi-yu, XIE Xiao-chang, YANG Ping, KONDA-GOKULDOSS Prashanth, ZHANG Han, JIA Yan-dong

High-entropy alloy composites (HEACs) have attracted significant attention due to their exceptional mechanical properties and chemical stability. By adjusting the content of reinforcing particles in the high-entropy alloy and by employing advanced additive manufacturing techniques, high-performance HEACs can be fabricated. However, there is still considerable room for improvement in their performance. In this study, CoCrFeMnNi HEA powders were used as the matrix, and NiCoFeAlTi high-entropy inte

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Microstructure and mechanical properties of additively manufactured FeCoCrMnNi high-entropy alloy composite after aging

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Original ResearchVol. 32, Issue 2 • pp. 857-869DOI: 10.1007/s11771-025-6015-2• Feb 14, 2025

Experimental and mechanistic study on iron extraction from high-iron red mud under multiple physical field coupling conditions

Authors: DONG Hai-pei, YANG Jin-lin, ZHOU Wen-tao, YU Xu-yang, MA Shao-jian, WANG Ding-zheng

Red mud is a solid waste discharged in the process of alumina production, and how to realize the efficient recovery of its iron is an urgent problem to be solved. In this study, the iron extraction test and mechanism study of high-iron red mud were carried out under the coupling conditions of multiple physical field (microwave field, gas-solid flow field and temperature field) with biomass as the reducing agent. The test results showed that under the optimal conditions, an iron concentrate with a yield of 78.4%, an iron grade of 59.23%, and a recovery rate of 86.65% was obtained. The analyses of XRD, XPS, TEM, and SEM-EDS showed that during the roasting process, the hematite in the high-iron red mud was completely converted to magnetite, and the biomass produced the reductant that provided the magnetization reaction; A large number of cracks and pores appeared in the surface of the hematite reduction product particles, which helped to induce iron minerals to undergo effective mineral phase transformation. The above study provides ideas for the phase transformation and efficient recovery of iron minerals in red mud.

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Experimental and mechanistic study on iron extraction from high-iron red mud under multiple physical field coupling conditions

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Original ResearchVol. 32, Issue 2 • pp. 229-241DOI: 10.1007/s11771-025-5956-9• Feb 12, 2025

Improving electrochemical performance of PEM water electrolyzer by optimizing side-chain structure and content of ionomer

Authors: LYU Hong, HU Ding, WANG Sen, SUN Yong-wen, ZHANG Cun-man

As the proton transport channel and binder within the catalytic layer (CL), the physicochemical properties of the ionomer can affect the CL microstructure and performance of the membrane electrode assembly. In this paper, we select ionomers with different side-chain lengths and investigate the effects of the side-chain structure and content of the ionomers on the performance of membrane electrode assembly (MEA). Electrochemical tests show that at a mass ratio of 10 wt.% of ionomer/Ir (I/Ir), lon

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Improving electrochemical performance of PEM water electrolyzer by optimizing side-chain structure and content of ionomer

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Original ResearchVol. 32, Issue 2 • pp. 637-649DOI: 10.1007/s11771-025-5986-3• Feb 9, 2025

Undrained mechanical behavior of unsaturated completely weathered granite: Experimental investigation and constitutive modeling

Authors: DU Shao-hua, MA Jin-yin, RUAN Bo, WU Gen-shui, ZHANG Rui-chao

The undrained mechanical behavior of unsaturated completely weathered granite (CWG) is highly susceptible to alterations in the hydraulic environment, particularly under uniaxial loading conditions, due to the unique nature of this soil type. In this study, a series of unconfined compression tests were carried out on unsaturated CWG soil in an underground engineering site, and the effects of varying the environmental variables on the main undrained mechanical properties were analyzed. Based on t

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Undrained mechanical behavior of unsaturated completely weathered granite: Experimental investigation and constitutive modeling

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Original ResearchVol. 32, Issue 2 • pp. 809-821DOI: 10.1007/s11771-025-5854-1• Feb 7, 2025

Electrical properties of PVDF/PZT composite films prepared by direct ink writing

Authors: ZHOU Run-kai, YANG Hong, PENG Chao-qun, WANG Ri-chu, ZHANG Dou, FANG Guang-qiang, WANG Xiao-feng

Polyvinylidene fluoride/lead zirconate titanate (PVDF/PZT) composite films have been prepared by direct ink writing and the effect of PZT content on crystallization behavior and electrical properties of film were systematically investigated. The composite films were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD), Flourier transform infrared spectroscope (FTIR) and differential scanning calorimeter (DSC). The results show that, surface modified PZT powder (PZT@PDA

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Electrical properties of PVDF/PZT composite films prepared by direct ink writing

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Original ResearchVol. 32, Issue 2 • pp. 245-257DOI: 10.1007/s11771-025-6006-3• Feb 6, 2025

Efficient extraction of metals from industrially produced pyrolytic black powder using citric acid: Process optimization and leaching mechanism

Authors: ZHANG Shen-ao, WANG Yong-wei, TAN Yu-e, WANG Li-jue, HAN Jun-wei

Full-component pyrolysis can process organic components and reduce cathode materials, making it a key focus in green recycling of lithium-ion batteries (LIBs). However, the leaching mechanism and kinetics of pyrolyzed black powder in organic acid systems remain unclear, with most research still at the laboratory stage. This study pioneers the exploration of the leaching behavior and reaction mechanism of valuable metal extraction from industrial-scale pyrolyzed black powder using citric acid. Th

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Efficient extraction of metals from industrially produced pyrolytic black powder using citric acid: Process optimization and leaching mechanism

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Original ResearchVol. 32, Issue 2 • pp. 417-429DOI: 10.1007/s11771-025-5909-3• Feb 4, 2025

Design method of high prestressed support for shallow-buried large-span caverns

Authors: JIANG Bei, WEI Hua-yong, WANG Qi, WANG Ming-zi, YIN Chen, ZHANG Yan-bo

The surrounding rock is prone to large-scale loosening and failure after the excavation of shallow large-span caverns because of the thin overlying strata and large cross-section span. The rational design of bolt support is very important to the safety control of surrounding rock as a common support means. The control mechanism and design method of bolt support for shallow-buried large-span caverns is carried out. The calculation method of bolt prestress and length based on arched failure and co

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Design method of high prestressed support for shallow-buried large-span caverns

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Original ResearchVol. 32, Issue 2 • pp. 653-665DOI: 10.1007/s11771-025-6020-5• Feb 3, 2025

Analysis of meshing characteristics of planetary gear system considering tooth surface roughness and elastohydrodynamic lubrication

Authors: LIU Ning, MA Hui, GUAN Hong, ZHOU Sai-nan, ZHAO Tian-yu, CAO Peng, WU Yu-ping

The contact characteristics of the rough tooth surface during the meshing process are significantly affected by the lubrication state. The coupling effect of tooth surface roughness and lubrication on meshing characteristics of planetary gear is studied. An improved three-dimensional (3D) anisotropic tooth surface roughness fractal model is proposed based on the experimental parameters. Considering asperity contact and elastohydrodynamic lubrication (EHL), the contact load and flexibility deformation of the tooth surface are derived, and the deformation compatibility equation of the 3D loaded tooth contact analysis (3D-LTCA) method is improved. The asperity of the tooth surface changes the system from EHL to mixed lubrication and reduces the stiffness of the oil film. Compared with the sun-planet gear, the asperity has a greater effect on the meshing characteristics of the ring-planet gear. Compared with the proposed method, the comprehensive stiffness obtained by the traditional calculation method considering the lubrication effect is smaller, especially for the ring-planet gear. Compared with roughness, speed and viscosity, the meshing characteristics of planetary gears are most sensitive to torque.

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Analysis of meshing characteristics of planetary gear system considering tooth surface roughness and elastohydrodynamic lubrication

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Original ResearchVol. 32, Issue 2 • pp. 825-837DOI: 10.1007/s11771-025-5942-2• Feb 1, 2025

Enhancing formability of NiS2 cathode by SiO2 doping for high-performance thermal batteries

Authors: SONG Ren-hong, HU Jing, LI Xiao, GUO Hao, ZHANG Wen, TIAN Qian-qiu, HU Wen-bin

As a cathode material for thermal batteries, NiS2 has a high theoretical capacity but low thermal stability. Besides, the poor formability of NiS2 powders also restricts the cathode performance of thermal batteries. In this paper, the novel NiS2/SiO2 composite material was developed by high temperature vulcanization to improve the thermal stability formability of NiS2. The good filling and lubrication of spherical SiO2 can improve the thermal conductivity of NiS2 electrode. The discharge test sh

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Enhancing formability of NiS2 cathode by SiO2 doping for high-performance thermal batteries

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