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Fabrication of Porous SiC Coatings on Quartz Substrates by Laser Chemical Vapor Deposition

Journal of Wuhan University of technology(Materials Science) 2025年第2期40卷 330-337页

作者： YANG Meijun CHEN Rui XU Qingfang GUO Bingjian LIU Kai TU Rong ZHANG Song State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Laser etching and laser chemical vapor deposition(LCVD)techniques were proposed for the rapid preparation of high-purity,strongly bonded SiC porous micro-nano-coatings on quartz *** laser serves as an external driving force for the vertical growth of SiC whiskers,facilitating the formation of a porous nanostructure that resembles coral models found in the macroscopic biological *** porous nanostructures are beneficial for reducing thermal expansion mismatch and relieving residual *** is capable of eliminating the cracks on the surface of SiC coatings as well as enhancing the bonding of SiC coatings with quartz substrates to avoid coating detachment.

关键词： laser etching laser CVD quartz substrate SiC coating

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Fast deposition of Ni doped YSZ coatings by cathode plasma electrolysis for solid oxide fuel cell applications

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Ceramics International 2025年第13期51卷 17268-17277页

作者： Liu, Chenxu Du, Ke Song, Chen Song, Yang Zhou, Chenchen Zhang, Jin Liu, Min Tian, Yu Meng, Yonggang State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China Institute of New Materials Guangdong Academy of Sciences National Engineering Laboratory of Modern Materials Surface Engineering Technology Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology Guangdong-Hong Kong Joint Laboratory of Modern Surface Engineering Technology Guangzhou510650 China School of Materials Science and Engineering Nanyang Technological University 639798 Singapore Beijing Key Laboratory for Corrosion Erosion and Surface Technology Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China

The fast fabrication of high-quality anode layers of solid oxide fuel cells (SOFCs) is a key factor for their efficient applications. In this work, a one-step method of cathode plasma electrolytic deposition (CPED) is developed to prepare Ni doped YSZ coatings with a thickness of 35–55 μm on porous stainless steel. Compared to the several hours required by traditional methods, a faster coating deposition that only takes 60 s is achieved owing to the effect of enormous energy of plasma arc at the solid-liquid interface in the CPED method. The preparation process is analyzed by recording the variation of current with voltage. The unique micro-structure of the coatings is observed, and the formation mechanism of the Ni doped YSZ coating during the CPED process is proposed. The deposited coatings show an excellent performance as the anode layers for SOFCs, with Sc2O3 stabilized ZrO2 coating prepared by atmospheric plasma spraying as electrolyte and La0.6Sr0.4Co0.2Fe0.8O3-δ as the cathode. The open circuit voltage of the cells reaches 1.000 V and the maximum power density reaches 817.4 mW cm−2 at 800 °C. The finding opens a novel pathway for the efficient preparation of anode materials for SOFCs. © 2025

关键词： Plasma spraying

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Decentralized Federated Learning Algorithm Under Adversary Eavesdropping

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 448-456页

作者： Lei Xu Danya Xu Xinlei Yi Chao Deng Tianyou Chai Tao Yang the State Key Laboratory of Synthetical Automation for Process Industries Northeastern University the Department of Mechanical Engineering University of Victoria Shanghai Institute of Intelligent Science and Technology Tongji University IEEE the Institute of Advanced Technology Nanjing University of Posts and Telecommunications

In this paper, we study the decentralized federated learning problem, which involves the collaborative training of a global model among multiple devices while ensuring data *** classical federated learning, the communication channel between the devices poses a potential risk of compromising private information. To reduce the risk of adversary eavesdropping in the communication channel, we propose TRADE(transmit difference weight) concept. This concept replaces the decentralized federated learning algorithm's transmitted weight parameters with differential weight parameters, enhancing the privacy data against eavesdropping. Subsequently, by integrating the TRADE concept with the primal-dual stochastic gradient descent(SGD)algorithm, we propose a decentralized TRADE primal-dual SGD algorithm. We demonstrate that our proposed algorithm's convergence properties are the same as those of the primal-dual SGD algorithm while providing enhanced privacy protection. We validate the algorithm's performance on fault diagnosis task using the Case Western Reserve University dataset, and image classification tasks using the CIFAR-10 and CIFAR-100 datasets,revealing model accuracy comparable to centralized federated learning. Additionally, the experiments confirm the algorithm's privacy protection capability.

关键词： Adversary eavesdropping decentralized federated learning privacy protection stochastic gradient descent

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The analysis and assessment of DC-Link voltage control loop dynamics on the transient synchronization stability of grid-following converters

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Electric Power Systems Research 2025年 247卷

作者： Xie, Chenyang Lin, Xinchun Sun, Huiqiang Wei, Juntian Zhang, Jiayan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

The transient synchronization stability of grid-following voltage source converters has been extensively investigated, but most of the previous literature has only studied the transient dynamics of the phase-locked loop (PLL) while ignoring the dynamics of the DC-link voltage control (DVC) loop. When the bandwidths of the PLL and DVC are relatively close to each other, erroneous conclusions will be derived if neglecting the transient influence of the DVC loop. This paper first takes into account the transient dynamics of the DVC loop while applying the improved equal-area criterion (EAC) analysis, which reveals how the DVC loop affects the transient synchronization stability. Then, a fourth-order model considering the DVC dynamics is obtained to quantitatively determine a reasonable range of bandwidth and damping ratio for the DVC loop. Moreover, the extent of the influence of DVC on transient synchronization stability with variation of grid strength is analyzed. © 2025

关键词： Transient analysis

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Niobium oxide/MXene heterostructure for simultaneous production of ammonia and energy via rechargeable Zn-N2 battery system

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Journal of Energy Chemistry 2025年第4期103卷 448-457页

作者： Xinyu Dai Wei Zhang Ying Sun Zhenyi Du Zhanliang Tao Jingang Wang Wenhui Fang Xuehan Xing Yang Chen Hui Li Hao Zheng Jieshan Qiu Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning Province College of ChemistryLiaoning University State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of Technology Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Renewable Energy Conversion and Storage Center College of Chemistry Nankai University College of Science Liaoning Petrochemical University College of Chemical Engineering State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Centre for Atomaterials and Nanomanufacturing (CAN) School of Science RMIT University ARC Industrial Transformation Research Hub for Intelligent Energy Efficiency in Future Protected Cropping (E2Crop) College of Chemical State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Aqueous Zn-N2batteries with unique configuration are of potential for simultaneous N2electro reduction and electricity generation,in which the electrocatalysts are critical for improving the NH3yield and the energy ***,a heterostructure Nb2O5/Nb2CTXwith abundant exposed Nb active sites and tuned electron density has been synthesized by in situ formation and anchoring of Nb2O5nanoparticles on the surface of Nb2CTXMXene,which shows an enhanced N2adsorption/activation *** heterostructure Nb2O5/Nb2CTXwas used as the cathode of Zn-N2battery that can deliver a peak power density of 1.25 mW cm-2in 1.0 M KOH and can continuously produce NH3with a yield of3.62 μg *** NH3formed in the battery system can be easily collected as a net product without circulating the ***,the Nb2O5/Nb2CTXhas a long durability,evidenced by 70 h of operation at-0.4 V *** hydrogen electrode,which is the highest among the MXene-based electrocatalysts reported thus *** work may provide a new methodology based on Zn-N2battery for sustainable and large-scale NH3production with minimal energy consumption.

关键词： NH 3 production Zn-N 2 battery N 2 Electroreduction Nb 2 O 5 /Nb 2 CT X heterostructure

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Nonflammable electrolyte with weak-solvation structure for stable NCM811 cathode under high temperature

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Journal of Energy Chemistry 2025年第5期104卷 111-117页

作者： Dawei Xu Chao Yang Ailing Yang Xiaowei Liu Meilong Wang Jin Han Tiefeng Liu Ya You State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology International School of Materials Science and Engineering School of Materials Science and Microelectronics Wuhan University of Technology College of Chemical and Biological Engineering Zhejiang University Quzhou Institute of Power Battery and Grid Energy Storage

High-nickel cathode LiNi0.8Co0.1Mn0.1O2（NCM811） could enable lithium-ion batteries （LIBs） with high energy ***,excessive decomposition of the electrolyte would happen in the high operating voltage *** addition,the utilization of flammable organic solvents would increase safety risks in the high temperature ***,an electrolyte consisting of flame-retardant solvents with lower highest occupied molecular orbital （HOMO） level and LiDFOB salt is proposed to address above two *** a result,a thin and robust cathode-electrolyte interface containing rich LiF and Li-B-O compounds is formed on the cathode to effectively suppress electrolyte decomposition in the high operating *** NCM811||Li cell paired with this designed electrolyte possesses a capacity retention of 72% after 300 cycles at 55℃.This work provides insights into developing electrolyte for stable high-nickel cathode operated in the high temperature.

关键词： Electrolyte engineering High temperature High-nickel cathode Safety Weak solvation

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Numerical Study of the Current Density on the Armature and Rail Interface with Dynamic Contact

Numerical Study of the Current Density on the Armature and R...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Xu, Jinghan Xia, Shengguo Chen, Lixue Ministry of Education Hubei Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819620791

The electrical contact between the armature and rail is acknowledged as imperfect electrical contact (ImPEC), exhibiting characteristics distinct from bulk behavior. It is important to understand the current distribution of the ImPEC for future design and optimization. This paper proposes ImPEC boundary conditions by combining the contact layer model (CLM) and the Cooper-Mikic-Yoranovich model (CMYM), and the current distribution is numerically studied. Variations in the contact pressure and current density with time are analyzed. The results show a rapid increase in the contact pressure and area during the current ramp-up stage, being constant in the flat stage, and a gradual decline in the current ramp-down stage. The current path changes with the contact area, and the current shifts from the trailing edge to the leading edge over time. Additionally, comparative calculations are performed to analyze current variations under dynamic contact. Results suggest that the current distribution is influenced by magnetic diffusion and forced shifts of current caused by dynamic contact. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Threshold current density

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Passive on-chip isolators based on the thin-film lithium niobate platform

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Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Hierarchical hollow microspheres assembled from carbon nanosheets integrated with molybdenum carbide nanoparticles for boosting microwave absorption properties

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Nano Research 2025年第1期18卷 10-20页

作者： Zongsheng Chen Yahui Wang Yi Liu Zhigang Li Xiangyin Lv Liping Liu Yajing Chang Jiaming Shi Xiao Zhang State Key Laboratory of Pulsed Power Laser Technology School of Electronic EngineeringNational University of Defense TechnologyHefei 230037China Anhui Provincial Laboratory of Advanced Laser Technology School of Electronic EngineeringNational University of Defense TechnologyHefei 230037China Centre for Environmental and Energy Nanomaterials Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Centre for Excellence in NanoscienceInstitute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China

Hierarchical hollow structure has demonstrated potential for enhancing electromagnetic(EM)attenuation and improving impedance matching,garnering significant attention for ***,we have successfully implemented compositional and structural engineering to fabricate hollow Mo2C/C microspheres with controllable composition by coupling interaction between dopamine hydrochloride and ammonium *** the synergistic effect of composition and hollow structure,the strongest reflection loss intensity and broadest effective absorption of the optimized sample reach-70.2 dB and 6.2 GHz,*** formation of hollow heterogeneous structures not only favors impedance matching feature,but also generates considerable contribution to EM attenuation ***,radar cross-section simulation data indicate that hollow Mo2C/C microspheres with compositional optimization and heterogeneous structures have broad prospects for practical applications.

关键词： electromagnetic absorption Mo2C/C microwave absorption hollow structure

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Microstructure and mechanical properties of nickel-based wrought superalloys under thermal-mechanical coupling: A review with Inconel 718,625 as main cases

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Progress in Natural Science:Materials International 2025年第1期35卷 65-82页

作者： Kai Cao Jiangkun Fan Xudong Liu Jianing Zhang Dian Jiao Yuelin Song Fulong Chen Jun Wang Bin Tang Hongchao Kou Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Chongqing Innovation Center Northwestern Polytechnical University AVIC Manufacturing Technology Institute

The typical processing and in-service behaviors of nickel-based wrought superalloys involve complex thermal-mechanical coupling effects, including elastic and plastic deformations, phase transformations, and other microstructural evolutions, directly impacting the mechanical properties. This review article provides an in-depth discussion on the microstructural evolution of these superalloys under thermal-mechanical coupling, focusing on two key aspects: the thermoplastic deformation behavior, and the phase transformation behavior in temperature/stress coupled field. The dynamic recrystallization(DRX) behavior during hot deformation and its improvement strategies are discussed in detail. The differences in phase precipitation behavior under conventional heat treatment and thermal-mechanical coupling conditions are compared. The mechanisms driving changes in precipitate characteristics are explored, enabling precise control of precipitates. This article further investigates the intricate relationship between the mechanical properties of nickel-based wrought superalloys and the characteristics of their precipitates, offering guidance for current and future optimizations. It also delves into the latest research advancements in precisely tailoring the precipitates through thermal-mechanical coupling methods to optimize these mechanical properties. Finally, it outlines several promising future research directions in this field.

关键词： Dynamic recrystallization

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