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Role of Mo particles on microstructure and tribological properties of atmospheric plasma sprayed Mo reinforced BN-NiCr coatings

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Surface science and Technology 2025年第1期3卷 1-12页

作者： Xu, Jinyong Su, Hongyuan Nie, Xudong Zhang, Zicong Zhou, Yuming Dosta, Sergi Zhang, Chao College of Mechanical Engineering Yangzhou University Jiangsu Province Yangzhou P.R. China Department of Material Science and Physical Chemistry Universitat de Barcelona Barcelona Spain

Atmospheric plasma spraying was employed to prepare NB (BN-NiCr) and NM (Mo/BN-NiCr) composite coatings. The incorporation of Mo particles reduced the friction coefficient of NM coatings (0.35–0.42) compared to NB coating. However, excessive Mo content can cause particle rebound, negatively affecting friction performance. The self-lubricating properties of Mo and the layered structure of BN form a lubricating film at the friction interface, reducing the wear rate. Additionally, Mo particles enhance the NiCr coating’s strength and wear resistance. The wear mechanism transitions from adhesive to abrasive wear, with localized high temperatures during friction promoting the formation of oxide films, such as NiO, Cr2O3, and MoO3, further improving the wear resistance.

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The enhanced thermoelectric properties of Pb-doped Cu2.85Ag0.15Sb0.985−xBi0.015Se4 samples synthesized via vacuum melting and cold isostatic pressing

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Ceramics International 2025年

作者： Wang, Honglei Tian, Zixuan Fu, Zhuang Zhao, Lijun Wang, Lei Dong, Songtao Ju, Hongbo School of Material Science and Engineering Jiangsu University of Science and Technology Zhenjiang212003 China Department of Mechanical Engineering University of Coimbra CEMMPRE ARISE Rua Luís Reis Santos Coimbra3030−788 Portugal Faculty of Mechanical Engineering University of Ljubljana TINT - Laboratory for Tribology and Interface Nanotechnology Aškerčeva 6 Ljubljana1000 Slovenia

Cu3SbSe4 has garnered significant attention due to its low thermal conductivity, complex elemental composition, and economic feasibility. In this study, Cu2.85Ag0.15Sb0.985−xBi0.015PbxSe4 (x = 0, 0.05, 0.10, and 0.15) samples were synthesized using a system of vacuum melting combined with cold isostatic pressing techniques. The impact of Pb doping on the thermoelectric properties of Cu2.85Ag0.15Sb0.985Bi0.015Se4 was comprehensively investigated. The experimental results revealed a notable increase in carrier concentration, from 2.95 × 1018 cm−3 to 8.31 × 1019 cm−3, leading to a substantial improvement on the electrical conductivity. At 573 K, the electrical conductivity of the Cu2.85Ag0.15Sb0.835Bi0.015Pb0.15Se4 reached 234.26 S cm−1, while the power factor of the Cu2.85Ag0.15Sb0.885Bi0.015Pb0.10Se4 achieved a maximum value of 883.5 μW m−1 K−2. The incorporation of Pb induced lattice defects, which modified the phonon mean free path and enhanced phonon scattering. As a result, the increased phonon scattering contributed to a reduction in lattice thermal conductivity within the Cu2.85Ag0.15Sb0.985Bi0.015Se4 sample. The thermoelectric figure of merit (ZT) for the Cu2.85Ag0.15Sb0.935Bi0.015Pb0.05Se4 reached a peak value of approximately 0.74 at 573 K, marking a 157.4 % improvement compared to that of Cu2.85Ag0.15Sb0.985Bi0.015Se4 (∼0.47). This study demonstrates that multi-element doping is a highly effective strategy for optimizing the thermoelectric properties of the Cu3SbSe4 system. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Germanium compounds

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Design and Optimization of the Porous Metamaterial EM Absorbers in X-band

Design and Optimization of the Porous Metamaterial EM Absorb...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Kanat Anurakparadorn Alan Taub Eric Michielssen Macromolecular Science and Engineering Program Department of Material Science and Engineering University of Michigan Ann Arbor Michigan USA Department of Mechanical Engineering University of Michigan Ann Arbor Michigan USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA

A strategy that combines experiment and simulation to design and optimize electromagnetic (EM) metamaterial absorbers containing a periodic porous structure is described. The approach provides the ability to produce absorbers that meet multiple user-specified objectives. Using the measured intrinsic properties of the baseline materials as an input to EM-field based computational modelling and optimization, absorption by the studied metamaterials measured by their reflection loss (RL) increases significantly. The resulting metamaterials have the potential for lower cost and lighter weight while providing greater protection than traditional metal gaskets and foams.

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Effect of TiO2 nanoparticles on the corrosion resistance, wear, and antibacterial properties of microarc oxidation coatings applied on AZ31 magnesium alloy

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Surface and Coatings Technology 2024年 476卷

作者： Chen, Wei Hao Huang, Shih-Yen Chu, Yu-Ren Yang, Shun-Han Cheng, I-Chung Jian, Shun-Yi Lee, Yueh-Lien Department of Engineering Science and Ocean Engineering National Taiwan University Taipei106 Taiwan Department of Mechanical Engineering National Taiwan University Taipei106 Taiwan Department of Material Engineering Ming Chi University of Technology New Taipei City24301 Taiwan

Microarc oxidation (MAO) is a surface modification process that is often adopted to produce a hard oxide layer on magnesium alloys to improve their corrosion resistance and wear resistance. However, under continual corrosion, the characteristic porous microstructure of MAO coatings provides diffusion paths that allow corrosive species to penetrate the coatings and react with the substrate underneath. Therefore, the present study investigated the modification of the microstructure of MAO coatings when adding TiO2 nanoparticles to a fluoride-containing silicate electrolyte system under the bipolar current mode. The results indicate that as the concentration of TiO2 nanoparticles increased, the quantity of rutile (TiO2) incorporated in the MAO coating increased, which led to the coating exhibiting an elevated hardness and a color change from white to gray-black. When the TiO2 concentration in the electrolyte was increased from 2.5 to 7.5 g/L, the total impedance of the MAO coating in electrochemical impedance spectroscopy analysis increased from 107 to >600 kΩcm2, which indicates that the corrosion resistance of the coating increased with the number of defects on it decreased. The addition of TiO2 enhances the photocatalytic properties of MAO coatings. However, excessive addition of TiO2 can lead to an adverse effect on the wear resistance of MAO coatings. © 2023 Elsevier B.V.

关键词： Titanium dioxide

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The Application of Freeze-casting Method for Fabrication of Calcium Phosphate Biomaterials 2022

The Application of Freeze-casting Method for Fabrication of ...

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11th International Conference on Informatics, Environment, Energy and Applications, IEEA 2022

作者： Lu, Jingyi Wang, Zhongchao Song, Weihai Zhao, Zhihuan Yu, Huijun Chen, Chuanzhong Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong Engineering & Technology Research Center for Superhard Material School of Materials Science and Engineering Shandong University China School of Mechanical and Electronic Engineering Shandong Agricultural and Engineering University China

ISBN: (纸本)9781450395830

Freeze-casting method has been developed to generate porous calcium phosphate (CaP) biomaterials due to its simple processing routes and excellent performance of products. This paper reviews recent achievements and applications of freeze-casting CaP scaffolds for bone repairment. Specific processing routes of this method is illustrated and several influencing factors of porous structure including direction of freezing, freeze temperature and sintering parameters are summarized in details. Besides, as the most important aspect of biomaterials, the biological property of freeze-casting CaP scaffold is reviewed. We also outlook the improvement in the fabrication porous ceramics by freeze-casting method. © 2022 ACM.

关键词： Calcium phosphate

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Toward Learning Factory for Industry 4.0: Virtual Reality (VR) for Learning Human–Robot Collaboration 1

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International Conference on Innovative Technologies in Intelligent Systems and Industrial Applications, CITISIA 2022

作者： Ariansyah, Dedy Colombo, Giorgio Pardamean, Bens Bioinformatics and Data Science Research Centre Bina Nusantara University Jakarta11480 Indonesia Department of Mechanical Engineering Politecnico di Milano Milan20156 Italy Computer Science Department BINUS Graduate Program Master of Computer Science Program Bina Nusantara University Jakarta11480 Indonesia

ISBN: (数字)9783031290787

ISBN: (纸本)9783031290770

Industry 4.0 will bring not only transformation to the manufacturing technologies but also to the profile of the workforce. Education system should be revised to prepare the future graduates embracing the knowledge of the ongoing revolution. Initiatives on the modification of curriculum and tools to deliver the concepts of Industry 4.0 must be taken. This paper examines limitations of current engineering tools and proposes a virtual reality (VR)-based learning platform to support the teaching and learning activity for Industry 4.0, focusing on the design of Human–robot Collaboration (HRC). The development process began with the identification of the general Intended Learning Outcomes (ILOs) which were extracted from the review of the HRC design issues, followed by the evaluation of the current teaching tool. From these results, the new requirements of the tools to achieve ILOs are redefined. The implementation of the system is demonstrated to show the feasibility of the proposed learning platform. This workflow can serve as initial development of another learning platform for the other innovative concepts that form the building blocks of Industry 4.0. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Industry 4.0

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The Influence of Acetylene Black Microparticles as a Fuel Additive in Pure Palm Oil and its Performance Characteristic on Diesel Engine

SSRN

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SSRN 2024年

作者： Prahmana, Rico Aditia Darmanto, Prihadi Setyo Juangsa, Firman Bagja Reksowardojo, Iman Kartolaksono Hendrarsakti, Jooned Serunting, Muhamad Allan Yuwazama, Zido Ahmad, Azaria Haykal Prakoso, Tirto Doctoral Program of Mechanical Engineering Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung40132 Indonesia Thermal Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Bandung Indonesia Program of Mechanical Engineering Department of Production and Industrial Technology Institut Teknologi Sumatera South Lampung 3536 Indonesia Departement of Chemical Engineering Faculty of Industrial Technology Institut Teknologi Bandung Bandung40132 Indonesia Program of Mechanical Engineering Faculty of Industrial Technology Universitas Pertamina Jakarta12220 Indonesia Program of Chemistry Faculty of Science Institut Teknologi Sumatera Lampung Selatan Indonesia

Fuel additives are recognized for their potential to make diesel engines cleaner and more efficient. However, the use of Pure Palm Oil (PPaO) as a fuel faces challenges due to its inherent combustion inefficiencies. This study explores how Acetylene Black (AB), as an additive, affects the combustion performance and spray characteristics of a diesel engine. Observations of spray phenomena were conducted using a High-Speed Camera Phantom C110. The addition of AB to PPaO resulted in an increase in engine power and torque by 11.43% at a 60% load, averaging a 2.97% improvement over diesel fuel (DF). PPaO demonstrated the most significant improvement in Specific Fuel Consumption (SFC) by 17.2% at a 40% load, averaging an 8.2% increase. For PPaO with AB (PPaOAB), the greatest enhancement in SFC occurred at a 10% load, showing a 9.2% improvement over DF, with an average increase of 2.1%. The study also found that thermal efficiency was optimally enhanced with PPaOAB at a 20% load, achieving a remarkable 17.7% improvement compared to DF. Notably, the inclusion of AB in PPaO significantly improved spray angle and penetration compared to PPaO alone. These findings suggest that AB could be a promising additive for PPaO, sparking further research interest in the application of AB in other fuels. © 2024, The Authors. All rights reserved.

关键词： Palm oil

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Optically-generated focused ultrasound for noninvasive brain stimulation with ultrahigh precision

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Light(science & Applications) 2022年第11期11卷 2817-2831页

作者： Yueming Li Ying Jiang Lu Lan Xiaowei Ge Ran Cheng Yuewei Zhan Guo Chen Linli Shi Runyu Wang Nan Zheng Chen Yang Ji-Xin Cheng Department of Mechanical Engineering Boston UniversityBostonMA 02215USA Graduate Program for Neuroscience Boston UniversityBostonMA 02215USA Department of Electrical and Computer Engineering Boston UniversityBostonMA 02215USA Department of Chemistry Boston UniversitBostonMA 02215USA Department of Biomedical Engineering Boston UniversityBostonMA 02215USA Division of Materials Science and Engineering Boston UniversityBostonMA 02215USA Department of Biological Engineering Massachusetts Institute of TechnologyCambridgeMA 02142USA

High precision neuromodulation is a powerful tool to decipher neurocircuits and treat neurological *** non-invasive neuromodulation methods offer limited precision at the milimeter ***,we report opticallygenerated focused ultrasound(OFUS)for non-invasive brain stimulation with ultrahigh *** is generated by a soft optoacoustic pad(SOAP)fabricated through embedding candle soot nanoparticles in a curved polydimethylsiloxane *** generates a transcranial ultrasound focus at 15 MHz with an ultrahigh lateral resolution of 83μm,which is two orders of magnitude smaller than that of conventional transcranial-focused ultrasound(tFUS).Here,we show effective OFUS neurostimulation in vitro with a single ultrasound *** demonstrate submillimeter transcranial stimulation of the mouse motor cortex in *** acoustic energy of 0.6 mJ/cm?,four orders of magnitude less than that of tFUS,is suffcient for successful OFUS *** offers new capabilities for neuroscience studies and disease treatments by delivering a focus with ultrahigh precision noninvasively.

关键词： SOAP stimulation precision

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Integer programming Approaches to an Issue of Scheduling for a Truck-Drone Last-Mile Delivery System with Parcel Pickup Service 13

Integer Programming Approaches to an Issue of Scheduling for...

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Joint 13th International Conference on Soft Computing and Intelligent Systems and 25th International Symposium on Advanced Intelligent Systems, SCIS and ISIS 2024

作者： Yamada, Kotaro Karuno, Yoshiyuki Iima, Hitoshi Graduate School of Science and Technology Kyoto Institute of Technology Mechanodesign Program Kyoto Japan Kyoto Institute of Technology Faculty of Mechanical Engineering Kyoto Japan Kyoto Institute of Technology Faculty of Information and Human Sciences Kyoto Japan

ISBN: (纸本)9798350373332

In this paper, we consider a scheduling issue for parcel delivery and pickup services by a truck-drone last-mile delivery system. We are given a single carrier truck and multiple identical drones to serve a finite set of customers. The single carrier truck plays the role of a mobile depot for the drones, and it visits several stops in a given order of them. The given order of stops constitutes a fixed truck route, and the carrier truck is allowed to launch (resp., to retrieve) a drone to (resp., from) a customer at a stop. For each sortie of a drone, the launching stop and the retrieving stop must be the same. The load capacity of a drone is limited to one, and for a sortie of a drone at a stop, there are three options: (i) only deliver a parcel to a customer, (ii) only pick up a parcel from a customer, and (iii) deliver a parcel to a customer, and then pick up a parcel from a customer. The scheduling problem asks to find an assignment of customers to drones with sortie options and a choice of a truck stop for each sortie in the assignment. The objective is to minimize the total duration of the carrier truck over all the stops, which is equivalent to minimizing the makespan. In this paper, we first propose an extended integer program for the case with both delivery and pickup services from an existing one for the case with delivery service only. We also conduct numerical experiments to demonstrate the solution quality of the proposed integer program by utilizing an integer programming solver, and report the results. © 2024 IEEE.

关键词： Integer programming

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Investigation of Accuracy of Linear Motor Positioning Systems using Different Filters

Investigation of Accuracy of Linear Motor Positioning System...

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Electrical, Electronic and Information sciences (eStream), Open Conference of

作者： Edgaras Urbonas Artūras Kilikevičius Julius Savickas Danielius Valaitis Department of Mechanical and Material Engineering Vilnius Gediminas Technical University Vilnius Lithuania Vilnius Gediminas Technical University Institute of Mechanical Science Vilnius Lithuania

ISBN: (数字)9798350352412

ISBN: (纸本)9798350352429

Fast-paced competition in the industrial environment requires high-precision, high-performance systems that allow industry players to stay on top. Precise changes to the mechanical structure of the positioning system are no longer sufficient. This paper examines the axis of a precision positioning system with a linear motor. System controllers (PIDs) of various architectures are investigated to determine their impact on the platform using three system controllers.

关键词： Industries Filters Control systems Motors

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