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A Review on Binderless Tungsten Carbide: Development and Application

Nano-Micro Letters 2020年第1期12卷 158-194页

作者： Jialin Sun Jun Zhao Zhifu Huang Ke Yan Xuehui Shen Jiandong Xing Yimin Gao Yongxin Jian Hejie Yang Bo Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE School of Mechanical EngineeringShandong UniversityJinan 250061People’s Republic of China Key Laboratory of Education Ministry for Modern Design and Rotor‑Bearing System Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Mechanical and Automotive Engineering Qilu University of TechnologyJinan 250353People’s Republic of China

WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past *** the advantages,however,recently there have been concerns about the challenges associated with the use of Co,*** instability,toxicity and properties degeneration,which necessitates the fabrication of binderless tungsten carbide(BTC).On the other hand,BTC or BTC composites,none of them,to date has been commercialized and produced on an industrial scale,but only used to a limited extent for specialized applications,such as mechanical seals undergoing high burthen as well as high temperature electrical *** are two challenges in developing BTC:fully densifying the sintered body together with achieving a high ***,this review applies towards comprehensively summarize the current knowledge of sintering behavior,microstructure,and mechanical properties of BTC,highlighting the densification improving strategies as well as toughening methods,so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly,harmless to human health and low in production *** paper shows that the fabrication of highly dense and high-performance BTC is economically and technically *** properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters.

关键词： Binderless tungsten carbide Sintering Densification Toughening Mechanical properties

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Recent development of chemically complex metallic glasses: from accelerated compositional design, additive manufacturing to novel applications

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Materials Futures 2022年第1期1卷 9-31页

作者： J Y Zhang Z Q Zhou Z B Zhang M H Park Q Yu Z Li J Ma A D Wang H G Huang M Song B S Guo Q Wang Y Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhenGuangdong 518060People’s Republic of China School of Materials Science and Engineering Dongguan University of TechnologyDongguanGuangdong 523808People’s Republic of China Institute of Materials China Academy of Engineering PhysicsJiangyouSichuan 621907People’s Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangshaHunan 410083People’s Republic of China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhouGuangdong 510632People’s Republic of China Institute of Materials Laboratory for MicrostructuresShanghai UniversityShanghai 200444People’s Republic of China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China

Metallic glasses(MGs)or amorphous alloys are an important engineering material that has a history of research of about 80–90 *** different fast cooling methods were developed for multi-component MGs between 1960s and 1980s,1990s witnessed a surge of research interest in the development of bulk metallic glasses(BGMs).Since then,one central theme of research in the metallic-glass community has been compositional design that aims to search for MGs with a better glass forming ability,a larger size and/or more interesting properties,which can hence meet the demands from more important *** this review article,we focus on the recent development of chemically complex MGs,such as high entropy MGs,with new tools that were not available or mature yet until recently,such as the state-of-the-art additive manufacturing technologies,high throughput materials design techniques and the methods for big data analyses(*** learning and artificial intelligence).We also discuss the recent use of MGs in a variety of novel and important applications,from personal healthcare,electric energy transfer to nuclear energy that plays a pivotal role in the battle against global warming.

关键词： metallic glasses amorphous alloys alloy design additive manufacturing machine learning high throughput materials design

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Prediction of electrical contact endurance subject to micro-slip wear using friction energy dissipation approach

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Friction 2019年第6期7卷 537-550页

作者： Xiangjun JIANG Fengqun PAN Guoqiang SHAO Jin HUANG Jun HONG Aicheng ZHOU Key Laboratory of Electronic Equipment Structural Design Xidian UniversityXi'an 710071China State Key Laboratory for Manufacturing System Xi’an Jiaotong UniversityXi'an 710049China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China Guilin University of Aerospace Technology Guilin 541004China

Fretting wear is a common cause of failure of an electrical contact(EC). In this study, we analyzed in detail the failure of EC induced especially by sliding using the representative electrical terminals. Furthermore, combining the friction energy dissipation theory, we proposed a prediction model to evaluate the electrical connector endurance(ECE) based on the contact stress and geometrical changes during the wear process obtained from a numerical model. The study helps establish that the friction energy dissipation theory is a powerful tool to analyze a contact failure due to wear. The proposed model proves to be effective in predicting the ECE for all considered cases such as micro-slip amplitude, contact force, overturning angle, superficial layer thickness, and friction/wear coefficients.

关键词： electrical connector endurance fretting wear friction energy dissipation finite element analysis

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3-DOF decoupled magnetic platform for optical low-frequency vibration isolation

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International Journal of Mechanical Sciences 2025年 300卷

作者： Qi, Wen-Hao Zhao, Tian-Yu Gao, Qiu-Hua Lu, Jia-Jia Cai, Long-Qi Li, Yang Yan, Ge Zhang, Wen-Ming State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai200240 China National Key Laboratory of Nuclear Reactor Technology Nuclear Power Institute of China Chengdu610213 China

Optical instruments, such as atomic force microscopes (AFM), are susceptible to interference from external vibrations, which can diminish imaging clarity and hinder optimal performance. A three-degree-of-freedom (3-DOF) decoupled magnetic platform (DMP) is proposed for optical low-frequency vibration isolation. The specially developed platform attains vibration decoupling through an orthogonal structural design and utilizes six identical vibration isolation units that are specially configured to achieve low dynamic stiffness and significantly low-frequency vibration isolation performance in both horizontal and vertical directions simultaneously. Different from the traditional realization of positive and negative stiffness combination, the novel isolation unit is designed using the constant magnetic force, which is generated from the magnetic field distortion. This implementation is revealed through magnetic field analysis and verified via static calibration. The dynamic model is established by considering viscous damping and dry friction, and the Runge-Kutta Method is applied to calculate the vibration response. Theoretical analyses are conducted to guide the design of the DMP and predict dynamic responses under different structural parameters, damping settings, and excitation conditions. Experiments are implemented to demonstrate the vibration isolation performance of the prototype. The result reveals the different effects of viscous damping and dry friction and demonstrates that the developed DMP has a broad frequency decoupled vibration isolation capability. The magnetic platform achieved by reusing the newly designed quasi-zero stiffness (QZS) unit provides a new option for optical vibration isolation, with the advantages of a large stroke and strong vibration decoupling. © 2025 Elsevier Ltd

关键词： Dynamic response

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Anomalous Polarization-Switching Phenomena and Noteworthy Pyroelectricity in Ferroelectric Hf0.5zr0.5o2 Polycrystalline Films

SSRN

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SSRN 2023年

作者： Wang, Xudong Zhou, Yong Xiong, Ke Wu, Shuyu Tu, Luqi Chen, Yan Wu, Shuaiqin Zeng, Jinhua Zheng, Yuqing Gu, Shiqun Luo, Man Lin, Tie Shen, Hong Meng, Xiangjian Liu, Qi Chu, Junhao Wang, Jianlu State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Key Laboratory of Microelectronics Device and Integrated Technology Institute of Microelectronics Chinese Academy of Sciences Beijing100029 China Frontier Institute of Chip and System Fudan University Shanghai200433 China Shanghai Frontier Base of Intelligent Optoelectronics and Perception Institute of Optoelectronics Fudan University Shanghai200433 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Chinese Academy of Sciences Hangzhou330106 China BirenTech Shanghai201114 China Jiangsu Key Laboratory of ASIC Design School of Information Science and Technology Nantong University Jiangsu Nantong226019 China

Hafnia-based oxide thin films exhibit unconventional robust ferroelectricity at the nanoscale, paving the way for advancements in next-generation nanoelectronics. However, the stability and dynamics of ferroelectric polarization in hafnia-based oxides films, particularly at the nanoscale, warrant further exploration. In this study, we delve into the factors influencing the formation of the ferroelectric phase. Our findings illuminate that the confinement effect of the capped layer enhances the stabilization of the metastable orthorhombic phase, thereby bolstering its ferroelectricity and endurance. Furthermore, we identify an unprecedented polarization-switching behavior in HfO2-based ferroelectric films, characterized by a decrease in the remanent polarization and an increase in the coercive field as the temperature drops. This peculiar phenomenon can be ascribed to the reduction in the long-range interaction of polarization dipoles upon cooling, as evidenced by the dielectric spectrum. The diminished long-range interaction results in the emergence of nanodomains and a re-entrant relaxer behavior, offering novel insights into the origin of ferroelectricity and the stability of ferroelectric polarization in hafnia-based thin films. Given the commendable compatibility of Hf0.5Zr0.5O2 films with Si substrates and a pyroelectric coefficient of -62.1 μC/m2·K, they emerge as a prime candidate for sensor device applications. © 2023, The Authors. All rights reserved.

关键词： Thin films

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Multi-agent SAC approach aided joint trajectory and power optimization for multi-UAV assisted wireless networks with safety constraints

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Chinese Journal of Aeronautics 2025年

作者： Jia SHI Zan LI Wentao SUN Zixuan BAI Feng WANG Tony Q. S. QUEK The State Key Laboratory of Integrated Service Networks School of Telecommunications Engineering Xidian University Xi’an 710071 China The Information System Technology and Design Pillar Singapore University of Technology and Design Singapore 487372 Singapore

Unmanned Aerial Vehicles (UAVs) have demonstrated significant potential as Aerial Base Stations (A-BSs) for providing data services to Ground Users (GUs), attributed to their flexibility, cost-effectiveness, and high likelihood of establishing line-of-sight links. In this article, we formulate the joint power and trajectory optimization problem for a multi-UAV assisted wireless network with no-fly zones constrained, aiming at maximizing the Accumulated Service Data (ASD) of UAVs and minimizing the Average End Age of Information (AEAoI) of GUs. Specifically, this paper proposes the Multi-Agent worst-case Soft Actor Critic (MA-wcSAC) algorithm with a distributional safety-critic. The simulation results demonstrate that, compared to the Multi-Agent Soft Actor Critic (MA-SAC) algorithm, the proposed algorithm exhibits comparable data service performance while reducing security risks by at least 30% at different risk levels.

关键词： Unmanned Aerial Vehicle (UAV) Age of Information (AoI) Safety Constraint Trajectory design Power Allocation Multi-Agent worst-case Soft Actor Critic (MA-wcSAC)

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Deep neural network based interpolation of sparse samples for time-dense power load forecasting 4

Deep neural network based interpolation of sparse samples fo...

引用

4th International Conference on Computer Engineering and Application, ICCEA 2023

作者： Li, Bo Zhao, Ruifeng Lu, Jiangang Xin, Kuo Huang, Jinhua Lin, Guanqiang Chen, Jinrong Pang, Xueyue Wu, Shunxin Electric Power Dispatching and Control Center of Guangdong Power Grid Co. Ltd. Guangdong Guangzhou China Electric Power Dispatching and Control Center of China Southern Power Grid Co. Ltd. Guangdong Guangzhou China Electric Power Research Institute of Guangdong Power Grid Co. Ltd. Guangdong Guangzhou China Huizhou Power Supply Bureau of Guangdong Power Grid Co. Ltd. Guangdong Huizhou China Foshan Power Supply Bureau of Guangdong Power Grid Co. Ltd. Guangdong Foshan China China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd. Guangdong Guangzhou China School of Electrical Engineering Chongqing University State Key Laboratory of Power Equipment & System Security and New Technology Chongqing China

ISBN: (纸本)9798350347548

Large amount of power load data with high-sampling rate plays a crucial role in the training of time-dense power load forecasting network. However, in many cases, there is a large amount of data with low-sampling rate, which can't directly train a time-dense forecasting network. Therefore, this paper proposes a deep learning based dataset interpolation method, which uses the available high-sampling rate power load datasets to train a dataset interpolation network, then interpolates the low - sampling rate datasets with trained network to obtain high-sampling rate datasets, and finally uses the interpolated datasets for time-dense forecasting network training. The results show that the data obtained based on the method proposed in this paper fits the ground-truth closer than the traditional interpolation, and the results of the network trained based on this dataset are more accurate in the subsequent forecasting tasks. © 2023 IEEE.

关键词： Interpolation

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Research on cyber security countermeasure technique of safety DCS in nuclear power plant 27

Research on cyber security countermeasure technique of safet...

引用

27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Liu, Mingxing Yan, Hao Ma, Quan Liu, Guanrong Zhao, Feifei National Key Laboratory for Reactor System Design Technology Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9784888983051

Cyber security event is one of the main concerns in instrumentation and control system of nuclear power plant, since the application and popularity of digital technology in industrial control area. To ensure the cyber security of safety DCS control system of nuclear power plant, this paper analyzes the security risks and vulnerabilities of field control systems, and proposes the cyber security plan for safety DCS platform. Combining with the point-to-point data flow model and the R&D of safety DCS platform, we depict the application of cyber security strategy in the product design stage. © 2018-2019 by JSME

关键词： Nuclear fuels

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Hybrid Beamforming design for Millimeter Wave Multiuser MIMO systems with Dynamic Subarrays

arXiv

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arXiv 2022年

作者： Wang, Gengshan Yang, Zhijia Gong, Tierui State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China The Key Laboratory of Networked Control System Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China The Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110169 China The University of Chinese Academy of Sciences Beijing100049 China Singapore University of Technology and Design Singapore

In this letter, we investigate the millimeter wave (mmWave) downlink multiuser multiple-input multiple-output (MU-MIMO) system, adopting the dynamic subarray architecture at the base station and considering the multi-stream communication for each user. Aiming at maximizing the system spectral efficiency, we propose a novel hybrid beamforming design. First, assuming no inter-user interference (IUI), we easily get the optimal fully-digital beamformers and combiners using the singular value decomposition of each user channel and the waterfilling algorithm. Then, based on the obtained fully-digital beamformers, we propose a Kuhn-Munkres algorithm-assisted dynamic hybrid beamforming design, which guarantees that each radio-frequency chain is connected to at least one antenna. Finally, we propose to further project each obtained digital beamformer onto the null space of all the other equivalent user channels to cancel the IUI. Numerical results verify the superiority of our proposed hybrid beamforming design. © 2022, CC BY.

关键词： Millimeter waves

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Rational design of Robust Flower-Like Sharp-Edge Acoustic Micromixers Towards Efficient Engineering of Functional 3d Zno Nanorod Array

SSRN

引用

SSRN 2022年

作者： Zhao, Xiong Chen, Hongqiang Xiao, Yaxuan Zhang, Jinhua Hao, Nanjing School of Chemical Engineering and Technology Xi'an JiaoTong University 28 Xianning West Road Shaanxi Xi’an710049 China State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai200050 China Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi’an Jiaotong University 28 Xianning West Road Shaanxi Xi’an710049 China

Sharp-edge acoustofluidic micromixers have attracted considerable attention in recent years due to their unique features in terms of flexible control, contactless operation, and short mixing distance. However, optimizing sharp-edge structures to achieve robust mixing performance towards efficient practical applications is still a great challenge. Herein, we first propose flower-like sharp-edge acoustic micromixers for developing functional 3D ZnO nanorod array. Numerical simulation and experimental validation are conducted to investigate the effect of petal numbers, spreading angles, and tip angles on the mixing performance. Generally, more petals need a larger spreading angle to achieve better mixing while a large spreading angle is unfavorable, and the mixing performance decreases with the increase of tip angles. Compared to single sharp-edge devices, flower-like sharp-edge ones always perform better mixing efficiency. The optimized device is utilized to synthesize well-defined 3D ZnO nanorod array inside a glass capillary and the excellent capabilities of photodegradation of dye and enrichment of heavy metal ions are examined. The photodegradation and enrichment efficiencies can be well regulated by adjusting the flow rates, and superior reusability of the engineered ZnO nanorod array is validated. These results not only shed new light on the rational design of acoustic micromixers, but also open up new possibilities for developing advanced lab-on-a-chip functional technologies. © 2022, The Authors. All rights reserved.

关键词： II-VI semiconductors

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