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Finite element simulation and experimental test of the wear behavior for self-lubricating spherical plain bearings

Friction 2018年第3期6卷 297-306页

作者： Yahong XUE Jigang CHEN Sumin GUO Qingliang MENG Junting LUO School of Mechanical Engineering Yanshan University Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan University Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University

In this study, based on the classical Archard adhesion wear theory, a three-dimensional finite element model was established, with the aim of simulating the failure process of self-lubricating spherical plain bearings in the swinging wear condition. The results show that the self-lubricating spherical plain bearings go through two different stages during the wear process, namely, initial wear stage and stable wear stage. Because the large contact points wear out during the initial wear stage, the maximum contact pressure decreases as the test period increases. The relatively larger wear depth region shows elliptical distribution, and the maximum distribution appears in the central contact area. The wear depth reaches 0.974 mm after swinging 25,000 times. PTFE fibers, which possess a good friction performance but poor abrasion resistance, abundantly exist on the friction surfaces of the fabric liner. Consequently, the friction torque during the initial wear stage is slightly smaller than the friction torque during the stable wear stage; however, the wear rate during the initial wear stage is high. The reliability and effectiveness of the finite element model are verified by experiment. The developed finite element model can be used for the analysis of the wear mechanisms of bearings and the prediction of the service life of bearings.

关键词： spherical plain bearing wear mechanisms wear depth contact pressure simulation

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Preparation of micro-patterned surfaces of Si-N-O films and their influence on adhesion behavior of endothelial cells

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science China(Technological sciences) 2010年第1期53卷 257-263页

作者： ZHENG Nan,YANG Ping,WANG QiYi,YANG ZhongHai & HUANG Nan key laboratory of advanced technology for Materials of Education Ministry,key laboratory of Artificial Organ surface engineering of Sichuan,School of Materials science and engineering,Southwest Jiaotong University,Chengdu 610031,China 1. Key Laboratory of Advanced Technology for Materials of Education Ministry Key Laboratory of Artificial Organ Surface Engineering of Sichuan School of Materials Science and Engineering Southwest Jiaotong University Chengdu 610031 China

Microgrooves were prepared on Si(100) surface by photolithography and wet ***,Si-N-O films were deposited on the microgrooves by unbalanced magnetron sputtering(UBMS) and micro-patterned surfaces of Si-N-O films were *** size of the micropatterns was measured by surface *** chemical composition of Si-N-O films were characterized by X-ray photoelectron spectrometry(XPS) and the wettability of the micropatterned surfaces was evaluated by contact angle *** behavior of endothelial cells adhered on the micro-patterned surfaces,including cells adhesion,proliferation and orientation,was evaluated by cell culture test and Alamar blue *** results showed that the amount and activity of endothelial cells on micro-patterned samples were higher than those on flat *** one day's incubation,the cells were well guided along the *** days later,most of the cells grew across the grooves and contacted each *** activity was also much higher than that on flat *** was suggested that the adhesion and proliferation of endothelial cells could be effectively enhanced by micropattern method.

关键词： micropatterns Si-N-O film endothelial cell unbalanced magnetron sputtering

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Microstructure evolution of extruded Mg-RE-Ag alloy during short-time heat treatment

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Journal of Rare Earths 2024年第12期42卷 2350-2361,I0006页

作者： Zehua Li Jinghuai Zhang Shujuan Liu Jiaming Hao Liyuan Liu Yuying He Haodong Zhang Xingkai Jiao Xiaobo Zhang Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing211167China

Microstructure regulation via short-time heat treatment is conducive to the optimization in the microstructure and properties of precipitable magnesium(Mg)alloys,but there is currently a lack of relevant *** this work,the microstructure evolution of a Mg-RE-Ag alloy during different short-time heat treatments was characterized and *** results show that extreme short-time heat treatment(ESHT,e.g.,2 min)at 450-480℃can greatly increase solute concentration in Mg matrix through the rapid re-dissolution of the second-phase and simultaneously maintain fine grains,while the ESHT at a too high temperature(e.g.,510℃)is not suitable due to excessive grain growth and coarse second phase regenerated at grain *** is found that 480℃is the approximate critical temperature for appropriate ESHT,and further prolongation of the time will lead to excessive grain *** is suggested that in addition to grain boundary migration,grain rotation is activated,resulting in the annihilation of high-angle grain boundaries with relatively low misorientation,as well as the reduction in the ability of the residual second phase to pin grain *** addition,the reasons for the abnormal grain boundary segregation and grain boundary continuous phase were analyzed from the perspective of interfacial *** study provides a basis for effective microstructure regulation of Mg-RE alloys.

关键词： Magnesium alloy Rare earths Microstructure Heat treatment Precipitates

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A new catalyst for urea oxidation: NiCo2S4 nanowires modified 3D carbon sponge

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Journal of Energy Chemistry 2020年第11期29卷 195-205页

作者： Biaopeng Li Congying Song Jianjun Rong Jing Zhao Hong-En Wang Ping Yang Ke Ye Kui Cheng Kai Zhu Jun Yan Dianxue Cao Guiling Wang Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Urea oxidation is a significant reaction for utilizing urea-rich wastewater or human urine as sustainable power sources which can ease the water eutrophication while generate electricity. A direct urea-hydrogen peroxide fuel cell is a new kind of fuel cell employing urea as fuel and hydrogen peroxide as oxidant which possesses a larger cell voltage. Herein, this work tries to promote the kinetics process of urea oxidation by preparing low-cost and high-efficient NiCo2S4 nanowires modified carbon sponge electrode. The carbon sponge used in this work with a similar three-dimensional multi-channel structure to Ni foam, is prepared by carbonizing recycled polyurethane sponge which is also a process of recycling waste. The performance of the prepared catalyst in an alkaline solution is investigated in a three-electrode *** the introduction of Co element to the catalyst, a reduced initial urea oxidation potential and a high performance are obtained. Furthermore, a direct urea-hydrogen peroxide fuel cell is assembled using the NiCo2S4 nanowires modified carbon sponge anode. Results indicate that the prepared catalyst provides a chance to solve the current problems that hinder the development of urea electrooxidation(high initial urea oxidation potential, low performance, and high electrode costs).

关键词： Carbon sponge Direct urea fuel cell Electrocatalyst NiCo2S4 nanowires Urea oxidation

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Lattice structures and electronic properties of CIGS/CdS interface:First-principles calculations

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Chinese Physics B 2014年第7期23卷 661-666页

作者：汤富领刘冉薛红涛路文江冯煜东芮执元黄敏 State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Department of Materials Science and EngineeringLanzhou University of Technology Science and Technology on Surface Engineering Laboratory Lanzhou Institute of Physics State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences

Using first-principles calculations within density functional theory, we study the atomic structures and electronic properties of the perfect and defective （2VCu＋ Incu） CulnGaSe2/CdS interfaces theoretically, especially the interface states. We find that the local lattice structure of （2VCu＋ InCu） interface is somewhat disorganized. By analyzing the local density of states projected on several atomic layers of the two interfaces models, we find that for the （2VCu＋InCu） interface the interface states near the Fermi level in CulnGaSe2 and CdS band gap regions are mainly composed of interracial Se-4p, Cu-3d and S-3p orbitals, while for the perfect interface there are no clear interface states in the CulnGaSe2 region but only some interface states which are mainly composed of S-3p orbitals in the valance band of CdS region.

关键词： first-principles calculation CulnGaSe2/CdS density of states interface states

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Ultrasonication-assisted and gram-scale synthesis of Co-LDH nanosheet aggregates for oxygen evolution reaction

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Nano Research 2020年第1期13卷 79-85页

作者： Tian-Jiao Wang Xiaoyang Liu Ying Li Fumin Li Ziwei Deng Yu Chen Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education) Key Laboratory of Macromolecular Science of Shaanxi ProvinceShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an710062China School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi’an710062China

Electrochemical water splitting(EWS)is a highly clean and efficient method for high-purity hydrogen ***,EWS suffers from the sluggish and complex oxygen evolution reaction(OER)kinetics at *** present,the efficient,stable,and low-cost non-precious metal based OER electrocatalyst is still a great and long-term challenge for the future industrial application of EWS ***,we develop a simple and fast approach for gram-scale synthesis of flower-like cobalt-based layered double hydroxides nanosheet aggregates by ultrasonic synthesis,which show outstanding electrocatalytic performance for the oxygen evolution reaction in alkaline media,such as preeminent stability,small overpotential of 300 mV at 10 mA·cm^−2 and small Tafel slope of 110 mV·dec^−1.

关键词： electrochemical water splitting oxygen evolution reaction gram-scale synthesis layered double hydroxides nanosheet aggregates

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A Triphenylamine-Functionalized Co-Assembly Material for Record Efficiency Inverted CsPbI3Perovskite Solar Cells

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Angewandte Chemie 2025年

作者： Dongfang Xu Huaiman Cao Zihao Fan Baihui Wang Yongzhe Li Rui Sun Yong Li Jieke Tan Hongjie Lei Prof. Yuwei Duan Prof. Hongtao Bian Prof. Ze Yu Prof. Zhike Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China State Key Laboratory of Fine Chemicals Frontier Science Center for Smart Materials Dalian University of Technology (DUT) Dalian 116024 China College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 China

The precise regulation of self-assembled monolayer (SAM) distribution and interfacial modification is pivotal for advancing the performance of p-i-n inverted perovskite solar cells (PSCs). Here, a new co-assembly material, 4-(aminomethyl)- N , N -diphenylaniline iodide (TPAI), is developed to make SAM orderly assembled. Density functional theory (DFT) calculation and sum frequency generation (SFG) spectroscopy reveal that TPAI binds with SAM via π-π interactions, effectively suppressing SAM aggregation and enhancing the orderliness of self-assembly. Further characterization by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) demonstrates that ─NH 3 group in TPAI coordinates with undercoordinated Pb 2+ to passivate defects of cesium lead triiodide (CsPbI 3 ) film. The TPAI modification creates a defect-minimized buried interface with optimized energy alignment, significantly improving hole extraction and transport kinetics. Consequently, the TPAI-treated CsPbI 3 PSCs achieve a high power conversion efficiency (PCE) of 21.60%, the highest reported value for inverted CsPbI 3 PSCs, maintaining 96.71% initial PCE after tracking at maximum power point (MPP) for 1400 h. This work provides a molecular-level strategy for interfacial engineering, advancing the development of efficient and durable perovskite photovoltaics.

关键词： CsPbI3 Co-assembly material Inverted perovskite solar cells Self-assembled molecules Triphenylamine

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First-principles calculations of 5d atoms doped hexagonal-AlN sheets: Geometry, magnetic property and the influence of symmetry and symmetry-breaking on the electronic structure

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Chinese Physics B 2014年第1期23卷 324-329页

The geometry, electronic structure and magnetic property of the hexagonal AlN(h-AlN) sheet doped by 5d atoms(Lu, Hf, Ta, W, Re, Os, Ir, Pt, Au and Hg) are investigated by first-principles calculations based on the density functional theory. The influence of symmetry and symmetry-breaking is also studied. There are two types of local symmetries of the doped systems: C3v and D3h. The symmetry will deviate from exact C3v and D3h for some particular dopants after optimization. The total magnetic moments of the doped systems are 0μBfor Lu, Ta and Ir; 1μB for Hf, W, Pt and Hg; 2μB for Re and Au; and 3μB for Os and Al-vacancy. The total densities of state are presented, where impurity energy levels exist. The impurity energy levels and total magnetic moments can be explained by the splitting of 5d orbitals or molecular orbitals under different symmetries.

关键词： hexagonal-AlN sheet first-principles calculations 5d atoms symmetry and symmetry-breaking

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A review of CoSb_(3)-based skutterudite thermoelectric materials

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Journal of advanced Ceramics 2020年第6期9卷 647-673页

作者： Zhi-Yuan LIU Jiang-Long ZHU Xin TONG Shuo NIU Wen-Yu ZHAO School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of EducationAnhui University of TechnologyMaanshan 243002China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

The binary skutterudite CoSb_(3) is a narrow bandgap semiconductor thermoelectric(TE)material with a relatively flat band structure and excellent electrical ***,thermal conductivity is very high because of the covalent bond between Co and Sb,resulting in a very low ZT ***,researchers have been trying to reduce its thermal conductivity by the different optimization *** addition,the synergistic optimization of the electrical and thermal transport parameters is also a key to improve the ZT value of CoSb_(3) material because the electrical and thermal transport parameters of TE materials are closely related to each other by the band structure and scattering *** review summarizes the main research progress in recent years to reduce the thermal conductivity of CoSb_(3)-based materials at atomic-molecular scale and nano-mesoscopic *** also provide a simple summary of achievements made in recent studies on the non-equilibrium preparation technologies of CoSb_(3)-based materials and synergistic optimization of the electrical and thermal transport *** addition,the research progress of CoSb_(3)-based TE devices in recent years is also briefly discussed.

关键词： skutterudite CoSb_(3)-based materials lattice thermal conductivity synergistic optimization thermoelectric properties thermoelectric devices

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Filling Ti_(3)C_(2)T_(x)nanosheets into melamine foam towards a highly compressible all-in-one supercapacitor

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Nano Research 2022年第4期15卷 3254-3263页

作者： Rui Guo Xiying Han Peng Yuan Xuexia He Qi Li Jie Sun Liqin Dang Zonghuai Liu Yating Zhang Zhibin Lei Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologyShaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119China College of Chemistry and Chemical Engineering Key Laboratory of Coal Resources Exploration and Comprehensive UtilizationMinistry of Natural ResourcesXi’an University of Science and TechnologyXi’an 710054China

The development of compressible supercapacitors strongly relies on the design of electrode materials combining superior compressibility,high conductivity with the stable electrochemical cycling *** this work,we report a facile yet scalable strategy to construct a highly compressible supercapacitor by integrating the current collector,active materials and the separator into one *** use the highly compressive melamine foam(MF)as scaffold and the Ti_(3)C_(2)T_(x)nanosheets as the active *** the few-layer Ti_(3)C_(2)T_(x)nanosheets into the skeleton of MF by capillary force followed by freeze-drying yields the MF/Ti_(3)C_(2)T_(x)composite with superior structural integrity that can be compressed at a large strain of 50%for 100 *** electrochemical performances of the all-in-one supercapacitor were systematically investigated under diverse compression *** improved conductivity and reduced ion diffusion length allow the all-in-one supercapacitor to exhibit fast ion and electron kinetics even at high strain of 60%,delivering a maximal volumetric specific energy of 0.37 mWh∙cm^(-3)at power density of 0.42 mW∙cm^(-3)and extraordinary cycling performance during the 2,500 compression cycles.

关键词： all-in-one supercapacitor Ti_(3)C_(2)T_(x)MXene melamine foam high compressibility fast ion and electron kinetics

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