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High temperature lubrication performance of chlorophenyl silicone oil

Friction 2024年第8期12卷 1716-1727页

作者： Yan MENG Xiangli WEN Jie CHENG Pengpeng BAI Yonggang MENG Yu TIAN School of Mechanical and Electrical Engineering China University of Mining and Technology-BeijingBeijing 100083China Department of Mechanical Engineering State Key Laboratory of Tribology in Advanced EquipmentTsinghua UniversityBeijing 100084China

Most studies of liquid lubricants were carried out at temperatures below 200°***,the service temperature of lubricants for aerospace and aeroengine has reached above 300°*** order to investigate the friction mechanism and provide data for high temperature lubrication,the friction and wear properties of chlorophenyl silicone oil(CPSO)-lubricated M50 steel and Si3N4 friction pairs were investigated ***-on-disk experimental results show that the lubrication performance of CPSO varies significantly with *** 150°C,coefficient of friction(COF)remains at 0.13–0.15 after the short running-in stage(600 s),while the COF in the running-in stage is 0.2–*** 200°C and above,the running-in time is much longer(1,200 s),and the initial instantaneous maximum COF can reach *** this condition,the COF gradually decreases and finally stabilizes at around 0.16–0.17 *** phenomenon is mainly due to the different thickness of boundary adsorption *** importantly,the wear rate of M50 steel increases significantly with the temperature,while the wear rate barely changes at temperatures above 200°*** anti-wear mechanism is explained as tribochemical reactions are more likely to occur between CPSO and steel surface with the increased temperature,generating the FeCl2 protective film on the metal ***,FeCl2 tribochemical film improves the lubrication and anti-wear capacity of the *** high temperatures(200–350°C),FeCl2 film becomes thicker,and the contact region pressure becomes lower due to the larger wear scar size,so the wear rate growth of M50 steel is much smaller compared with that of low temperatures(22–150°C).The main findings in this study demonstrate that CPSO lubricant has good anti-wear and lubrication capacity,which is capable of working under temperatures up to 350°C.

关键词： chlorophenyl silicone oil(CPSO) liquid lubricant anti-wear high temperature

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Launch Efficiency of Capacitive Energy-Storage electromagnetic Railgun System 10

Launch Efficiency of Capacitive Energy-Storage Electromagnet...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Xiao, Tingyun Chen, Lixue Xu, Xuan Xu, Shengqin Zhang, Wenhao Zhao, Bingxuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

electromagnetic railgun have high initial velocity, long range and other advantages. Improving the launch efficiency is one of the most important needs for the application of electromagnetic rail launch technology. Based on the subsystem models of pulse power supply, rail and armature of railgun, the equivalent circuit mathematical model of the electromagnetic rail gun system under lumped parameters is established. The effects of capacitance, voltage, inductance, resistance and acceleration distance on the system efficiency were simulated and analyzed. The results of the study are of great significance in guiding the design of the electromagnetic launch system. © 2024 Eindhoven University of technology.

关键词： Rail guns

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Modular Modeling Method for Transfer Function of VSC Grid-Connected System 3

Modular Modeling Method for Transfer Function of VSC Grid-Co...

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3rd International Conference on Intelligent Power and Systems, ICIPS 2023

作者： Li, Yutong Sun, Haishun The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan China

ISBN: (纸本)9798350328691

This paper provides a detailed introduction to a modular modeling approach for the transfer function of the VSC grid-connected system. The obtained results can accurately reflect the small-disturbance stability level of VSC grid-connected systems. These results are based on the VSC outer-loop reference signal and the corresponding feedback signal, constituting a two-input two-output system. The modeling process involves three steps. Initially, only the dynamic processes of the VSC inner-loop control and PLL control modules are considered. Subsequently, the relevant modules of the VSC outer-loop control are included. Finally, it is condensed into a concise form. By utilizing the basic property of linearity in systems that adhere to the superposition principle, it can be converted into an equivalent single-input single-output system. This enables the application of the Nyquist stability criterion for stability analysis. All results presented in this paper have been validated through PSCAD/EMTDC simulation. ©2023 IEEE.

关键词： Transfer functions

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Swarming Magnetic Fe_(3)O_(4)@Polydopamine-Tannic Acid Nanorobots:Integrating Antibiotic-Free Superficial Photothermal and Deep Chemical Strategies for Targeted Bacterial Elimination

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Research 2025年第1期2024卷 840-853页

作者： Luying Si Shuming Zhang Huiru Guo Wei Luo Yuqin Feng Xinkang Du Fangzhi Mou Huiru Ma Jianguo Guan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina Wuhan Institute of Photochemistry and Technology WuhanChina School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhanChina

Micro/nanorobots(MNRs)are envisioned to provide revolutionary changes to therapies for infectious diseases as they can deliver various antibacterial agents or energies to many hard-to-reach infection ***,existing MNRs face substantial challenges in addressing complex infections that progress from superficial to deep ***,we develop swarming magnetic Fe3O4@polydopamine-tannic acid nanorobots(Fe3O4@PDA-TA NRs)capable of performing targeted bacteria elimination in complicated bacterial infections by integrating superficial photothermal and deep chemical *** Fe3O4@PDA-TA nanoparticles(NPs),serving as building blocks of the nanorobots,are fabricated by in situ polymerization of dopamine followed by TA *** driven by alternating magnetic fields,Fe3O4@PDA-TA NPs can assemble into large energetic microswarms continuously flowing forward with tunable ***,the swarming Fe3O4@PDA-TA NRs can be navigated to achieve rapid broad coverage of a targeted superficial area from a distance and rapidly eradicate bacteria residing there upon exposure to near-infrared(NIR)light due to their efficient photothermal ***,they can concentrate at deep infection sites by traversing through confined,narrow,and tortuous passages,exerting sustained antibacterial action through their surface TA-induced easy cell adhesion and subsequent membrane ***,the swarming Fe3O4@PDA-TA NRs show great potential for addressing complex superficial-to-deep *** study may inspire the development of future therapeutic microsystems for various diseases with multifunction synergies,task flexibility,and high efficiency.

关键词： therapies infectious diseases complex infections chemical therapy magnetic nanoparticles polydopamine photothermal therapy targeted bacteria elimination tannic acid

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Effect of surface morphology on armature melt wear 10

Effect of surface morphology on armature melt wear

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

作者： Zhao, Bingxuan Chen, Lixue Xu, Shengqin Xu, Xuan Zhang, Wenhao Xiao, Tingyun Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9789038661353

Armature melting during electromagnetic launch affects the electrical contact characteristics between armature and rail, which in turn affects the launching process and the service life of the launcher. A coupled multi-physics field model considering rough surfaces is constructed. Based on this, the influence law on armature erosion characteristics is *** results show that the higher the armature surface characteristic scale factor the lower the overall armature temperature, the later the melting onset time, but the more uneven armature surface melting;the higher the surface fractal dimension the less armature melting. The results provide a reference for the optimization of armature surface processing. © 2024 Eindhoven University of technology.

关键词： Fractal dimension

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Finite element analysis of pile expansion by shock wave of metal wire explosion in liquids 6

Finite element analysis of pile expansion by shock wave of m...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Liu, Yi Huang, Shijie Zhao, Yong Xu, Youlai Wang, Tianyu Lin, Fuchang Li, Hua Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Key Laboratory of Pulsed Power Technology Wuhan China

ISBN: (纸本)9798350346671

Construction of specially shaped pile foundations by compacting the soil around the borehole with shock waves, which can effectively increase the load-bearing capacity of the pile material. The metal wire explosion in liquid has the advantages of high energy efficiency, good repeatability and controllability. The strong shock wave generated by the explosion can compress the soil to enlarge the size of pile foundations and construct shaped pile foundations, which has industrial prospects. In order to analyze the mechanism of pile expansion by metal wire explosion in liquid, a test platform was established, and parameters such as discharge voltage, current and energy were obtained. Based on the dynamic analysis software Ls-dyna, a two-dimensional simulation model of the shock wave generated by explosion in liquid acting on the soil was established, and the material parameters and model dimensions were reasonably determined. The propagation and attenuation processes of shock waves in cement slurry and soil were numerically simulated. The cumulative effect of pile foundation expansion under the action of multiple shock waves was analyzed, and compared with the test results. © 2023 IEEE.

关键词： Piles

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Bottlebrush Random Copolymers at Oil-Oil Interfaces

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Chinese Journal of Chemistry 2025年第2期43卷 139-145页

作者： Yaxin Wang Yunhui Wen Yuzheng Luo Shuailong Li Jiaqiu Luo Shaowei Shi State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029 China

Oil-in-oil nonaqueous emulsions are of great interest for developing emulsion-templated polymers and encapsulation systems that are incompatible with water-sensitive ***-made amphiphilic block copolymers are by far the most efficient stabilizers for oil-in-oil emulsions while less attention is given to copolymers with more complex ***,we report the stabilization of DMSO-silicone oil interface by bottlebrush random copolymers(BRCPs)containing norbornene backbones with densely grafted poly(methyl methacrylate)(PMMA)and polystyrene(PS)side *** assembly kinetics of BRCPs at the DMSO-silicone oil interface can be divided into three processes,including diffusion,reconfiguration and reorganization,and can be varied by tuning the degree of polymerization of the backbone(NB).Due to the high efficiency of BRCPs in reducing the interfacial tension,when using BRCPs as stabilizers,stable silicone oil-in-DMSO traditional emulsions and high internal phase emulsions(HIPEs)can be successfully obtained,while no stable emulsions can be achieved with linear PMMA-b-PS serving as the *** study,for the first time,underscores the great potential of amphiphilic bottlebrush copolymers in preparing oil-in-oil *** the advances in polymerization strategy,a broad variety of amphiphilic bottlebrush copolymers are expected to be synthesized and applied in the stabilization of nonaqueous biphasic systems.

关键词： Bottlebrush copolymers Oil-oil interfaces|Emulsions Surfactants Assembly dynamics

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Cross-upgrading of biomass hydrothermal carbonization and pyrolysis for high quality blast furnace injection fuel production:Physicochemical characteristics and gasification kinetics analysis

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 268-281页

作者： Han Dang Runsheng Xu Jianliang Zhang Mingyong Wang Jinhua Li State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Chemical Engineering The University of QueenslandQueensland 4072Australia

The paper proposes a biomass cross-upgrading process that combines hydrothermal carbonization and pyrolysis to produce high-quality blast furnace injection *** results showed that after upgrading,the volatile content of biochar ranged from 16.19%to 45.35%,and the alkali metal content,ash content,and specific surface area were significantly *** optimal route for biochar pro-duction is hydrothermal carbonization-pyrolysis(P-HC),resulting in biochar with a higher calorific value,C=C structure,and increased graphitization *** apparent activation energy(E)of the sample ranges from 199.1 to 324.8 kJ/mol,with P-HC having an E of 277.8 kJ/mol,lower than that of raw biomass,primary biochar,and *** makes P-HC more suitable for blast furnace injection ***,the paper proposes a path for P-HC injection in blast furnaces and calculates potential environmental benefits.P-HC of-fers the highest potential for carbon emission reduction,capable of reducing emissions by 96.04 kg/t when replacing 40wt%coal injec-tion.

关键词： blast furnace injection biomass cross-upgrading hydrothermal carbonization pyrolysis physicochemical properties gasific-ation properties

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Operation Strategy of Cryogenic System for High-Temperature Superconducting Cable Based on The Recommended Interval

Operation Strategy of Cryogenic System for High-Temperature ...

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2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Chen, Guilun Ren, Li Xu, Ying Long, Feiyang Wu, Jiajie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350301571

High temperature superconducting (HTS) cables will suffer from performance degradation at high operating temperatures, and in severe cases even quench. The cryogenic system is able to effectively regulate the temperature distribution of the HTS cable by setting the operating parameters in a reasonable range to ensure its performance. It is therefore necessary to investigate operation strategy for cryogenic system that take the temperature distribution along the cable into account. In this paper, the specific requirements for the safe operation of HTS cable system with regard to the operating parameters of cryogenic system are analyzed. An operation strategy for cryogenic system is proposed to achieve thermally stable operation of HTS cable. © 2023 IEEE.

关键词： cryogenic system High temperature superconducting cable operation strategy temperature distribution

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Al-F co-doping towards enhanced electrolyte-electrodes interface properties for halide and sulfide solid electrolytes

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Chinese Chemical Letters 2025年第1期36卷 610-617页

作者： Han Yan Jingming Yao Zhangran Ye Qiaoquan Lin Ziqi Zhang Shulin Li Dawei Song Zhenyu Wang Chuang Yu Long Zhang College of Physics and Energy Fujian Normal UniversityFuzhou 350117China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Guilin Electrical Equipment Scientific Research Institute Co. Ltd.Guilin 541004China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China

All-solid-state Li batteries(ASSLBs)using solid electrolytes(SEs)have gained significant attention in recent years considering the safety issue and their high energy *** these advantages,the commercialization of ASSLBs still faces challenges regarding the electrolyte/electrodes interfaces and growth of Li *** doping is an effective and direct method to enhance the performance of ***,we report an Al-F co-doping strategy to improve the overall properties including ion conductivity,high voltage stability,and cathode and anode ***,the Al-F co-doping enables the formation of a thin Li-Al alloy layer and fluoride interphases,thereby constructing a relatively stable interface and promoting uniform Li *** similar merits of Al-F co-doping are also revealed in the Li-argyrodite *** assembled with these optimized electrolytes gain good electrochemical performance,demonstrating the universality of Al-F co-doping towards advanced SEs.

关键词： Solid electrolytes Li halides Li_(2)ZrCl_(6) Li argyrodites Fluorine doping

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