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Anomalous properties of spark plasma sintered boron nitride solids

Materials Today 2025年 86卷 42-51页

作者： Biswas, Abhijit Serles, Peter Alvarez, Gustavo A. Schimpf, Jesse Hache, Michel Kong, Jonathan Demingos, Pedro Guerra Yuan, Bo Pieshkov, Tymofii S. Li, Chenxi Puthirath, Anand B. Gao, Bin Gray, Tia Zhang, Xiang Murukeshan, Jishnu Vajtai, Robert Dai, Pengcheng Singh, Chandra Veer Howe, Jane Zou, Yu Martin, Lane W. Clancy, James Patrick Tian, Zhiting Filleter, Tobin Ajayan, Pulickel M. Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States Department of Mechanical & Industrial Engineering University of Toronto 5 King's College Road TorontoM5S 3G8 Canada Sibley School of Mechanical and Aerospace Engineering Cornell University IthacaNY14853 United States Department of Materials Science and Engineering University of California Berkeley94720 United States Department of Materials Science and Engineering University of Toronto 184 College St TorontoM5S 3E4 Canada Department of Physics and Astronomy McMaster University HamiltonL8S 4M1 Canada Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley94720 United States

Hexagonal boron nitride (h-BN) is a brittle ceramic with a layered structure, however, recent experiments have suggested that inter-layer structural engineering could be key to new structural and functional properties. Here we report the scalable bulk synthesis of high-density crystalline h-BN solids, by using high-temperature spark plasma sintering (SPS) of h-BN powders, which show high values of mechanical strength, ductility, dielectric constant, thermal conductivity, and exceptional neutron radiation shielding capability. Through exhaustive characterizations we reveal that SPS induces non-basal plane crystallinity, twisting of layers, and facilitates inter-grain fusion with a high degree of in-plane alignment across macroscale dimensions, resulting in near-theoretical density and improved properties. Our findings highlight the importance of material design, via new approaches such as layer twisting and interlayer interconnections, to create novel ceramics with properties that could go beyond their intrinsic limits. © 2025

关键词： Ductility

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Microwave dielectric and structural characteristics in Li2O-B2O3-SiO2 glass ceramics

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Ceramics International 2025年第16期51卷 22925-22931页

作者： Qiu, Jun-Yan Tu, Chi-Shun Huang, Szu-Ting Li, Yongxiang Chen, Pin-Yi Chen, Cheng-Sao Montecillo, Rhys Feng, Kuei-Chih International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City Taiwan Department of Physics Fu Jen Catholic University New Taipei City Taiwan Department of Mechanical Engineering Ming Chi University of Technology New Taipei City Taiwan School of Engineering RMIT University MelbourneVIC3000 Australia Research Center for Intelligent Medical Devices Ming Chi University of Technology New Taipei City Taiwan Department of Mechanical Engineering Hwa Hsia University of Technology New Taipei City Taiwan

Advancements in high-frequency communication devices have emphasized miniaturization and low energy consumption. This work focuses on developing microwave dielectric materials characterized by an ultra-low dielectric constant and low dielectric loss coefficient. In this study, B2O3 and Li2O were added into the SiO2 matrix to form the LBS glass-ceramics. The B2O3-added SiO2 shows a formation of α-cristobalite phase, and the Li2O additive in the B2O3-SiO2 glass-ceramics sintered at 900 °C reveal a primary quartz phase with a secondary phase Li2Si2O5, that partially transformed into Li2SiO3 in the specimen sintered at 950 °C. The LBS12 (x = 12 wt%) show stronger Raman peaks of Li2Si2O5 and Li2SiO3, indicating increase of highly-crystallized Si-O network. As the quartz phase diminishes, Li2Si2O5 and Li2SiO3 begin to develop in the glass-ceramic matrix. Dense microstructures and well-formed crystalline grains were observed in the LBS glass-ceramics. The quality factors were primarily affected by grain size and density. The Li2Si2O5 additive in the LBS glass-ceramics can reduce dielectric permittivity (Εr) and increase Q × f, particularly at higher frequencies. A low Εr of 4.7–5, a high Q × f of 2600 GHz, and a hardness of 249 MHV were achieved in the LBS12 sintered at 900 °C. These LBS glass-ceramics exhibit potential for use in low-temperature co-fired ceramic (LTCC) applications in high-frequency communication devices. © 2025

关键词： Sintering

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Tribological performance of iron- and nickel-base self-lubricating claddings containing metal sulfides at high temperature

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Friction 2022年第12期10卷 2069-2085页

作者： Hector TORRES Tugce CAYKARA Jens HARDELL Janne NURMINEN Braham PRAKASH Manel RODRIGUEZ RIPOLL AC2T research GmbH Viktor-Kaplan-Straße 2/CWiener Neustadt 2700Austria Department of Applied Physics and Mechanical Engineering LuleåUniversity of TechnologyLuleå97187Sweden Castolin Eutectic GmbH Gutenbergstraße 10Kriftel 65830Germany Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China

Iron-based coatings with the incorporation of solid lubricants have been prepared by means of laser cladding,in an effort to control friction and decrease tool wear at high temperatures during metal forming *** choice of a Fe-based powder has been considered advantageous,as it can lead to decreased costs compared to nickel-based claddings previously studied by the authors,in addition to having a lower environmental *** particular,the incorporation of transition metal dichalcogenides such as MoS_(2) as precursors leads to the encapsulation of silver in Fe-based self-lubricating claddings,resulting in a uniform distribution of the soft metal across the thickness of the *** tribological evaluation of the claddings at high temperatures shows that the addition of lubricious compounds leads to lower friction at room temperature and significantly decreased wear up to 600℃ compared to the unmodified iron-based reference alloy,although higher than similar self-lubricating Ni-based *** order to cast light into these observed differences,the corresponding microstructures,phase composition,and self-lubricating mechanisms have been studied and compared for Fe-and Ni-based claddings having both of them the addition of silver and MoS_(2).The results suggest a key role of the formation of protective tribolayers on the counter body during high temperature sliding *** simulation of the phase evolution during solidification reveals that the formation of different chromium-and nickel-based metal sulfides in Fe-and Ni-claddings during laser cladding by the decomposition of MoS_(2) plays a key role in determining their tribological behaviour at high temperatures.

关键词： high temperature laser cladding self-lubrication metal forming chromium sulphide MoS_(2)

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Small. Low Power Salinity Sensors Based on Solid State Potentiometry for Ocean Applications

Small. Low Power Salinity Sensors Based on Solid State Poten...

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2023 MTS/IEEE U.S. Gulf Coast, OCEANS 2023

作者： Nawaz, Anuscheh Chung, Jae-Hyun Soelberg, Scott D. Burnett, David C. Kucewicz, John Steele, Michael University of Washington Applied Physics Labortory Seattle United States University of Washington Mechanical Engineering Department Seattle United States Portland State University Electrical and Computer Engineering Department Portland United States

ISBN: (纸本)9798218142186

Solid state potentiometry measures ion concentration is explored for ocean sciences. A small, low cost and low power sensor to measure salinity is currently not available in ocean sciences, but could unlock large scale spatial and temporal characterization of oceanographic areas of interest, such as the Arctic or coastal environments. To date these types of sensors are typically calibrated before each measurement, and target low concentrations. The challenge for these oceanographic environments is that the relevant concentration is much higher than usual for these sensors, and that calibration cannot take place before each measurement as buoy deployment is necessary for long term data collection. We are developing a small, low power salinity sensor based on chloride ion measurement, targeted at 20 ppt to 40 ppt, at sensitivities of 0.1 ppt. Here, we present current characterization results with respect to chloride ion concentration, temperature, and drift, and discuss methods to reduce and potentially measure drift in-situ. © 2023 The Marine Technology Society (MTS).

关键词： Ions

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AI-enabled Lorentz microscopy for quantitative imaging of nanoscale magnetic spin textures

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npj Computational Materials 2024年第1期10卷 2102-2111页

作者： Arthur.R.C.McCray Tao Zhou Saugat Kandel Amanda Petford-Long Mathew J.Cherukara Charudatta Phatak Materials Science Division Argonne National LaboratoryLemontILUSA Applied Physics Program Northwestern UniversityEvanstonILUSA Center for Nanoscale Materials Argonne National LaboratoryLemontILUSA Advanced Photon Source Argonne National LaboratoryLemontILUSA Department of Materials Science and Engineering Northwestern UniversityEvanstonILUSA

The manipulation and control of nanoscale magnetic spin textures are of rising interest as they are potential foundational units in next-generation computing *** this requires a quantitative understanding of the spin texture behavior under external stimuli using in situ *** transmission electron microscopy(LTEM)enables real-space imaging of spin textures at the nanoscale,but quantitative characterization of in situ data is extremely ***,we present an AI-enabled phase-retrieval method based on integrating a generative deep image prior with an image formation forwardmodel for *** approach uses a single out-of-focus image for phase retrieval and achieves significantly higher accuracy and robustness to noise compared to existing ***,our method is capable of isolating sample heterogeneities from magnetic contrast,as shown by application to simulated and experimental *** approach allows quantitative phase reconstruction of in situ data and can also enable near real-time quantitative magnetic imaging.

关键词： textures magnetic Lorentz

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Dimension-dependent mechanical features of Au-nanocrystalline nanofilms

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Nano Research 2023年第12期16卷 13400-13408页

作者： Lijun Ma Lena Du Shu Wang Qing Wang Shifeng Xue Hanxing Zhu Qian Liu Department of Engineering Mechanics College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580China CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology&University of Chinese Academy of SciencesBeijing 100190China Department of Physics Capital Normal UniversityBeijing 100048China School of Engineering Cardiff UniversityCardiff CF243AAUK MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics InstituteSchool of PhysicsNankai UniversityTianjin 300457China College of Mechanical and Architectural Engineering Taishan UniversityTai’an 271000China

For metal nanofilms composed of nanocrystals,the multiple deformation mechanisms will coexist and bring unique and complex elastic-plastic and fracture mechanical *** successfully fabricating large quantities of uniform doubly-clamped suspended gold(Au)nanobeams with different thicknesses and nanograin sizes,we obtain full-spectrum mechanical features with statistical significance by combining atomic force microscopy(AFM)nanoindentation experiments,nonlinear theoretical model,and numerical *** yield and breaking strengths of the Au nanobeams have a huge increase by nearly an order of magnitude compared with bulk Au and exhibit strong nonlinear effects,and the corresponding strong-yield ratio is up to 4,demonstrating extremely high strength reserve and vibration *** strong-yield ratio gradually decreases with decreasing thickness,identifying a conversion of the failure type from ductile to ***,the Hall–Petch relationship has been identified to be still valid at the nanoscale,and K in the equation reaches 4.8 Gpa·nm1/2,nearly twice of bulk nanocrystalline Au,which is ascribed to the coupling effect of nanocrystals and nanoscale thickness.

关键词： nanocrystalline Au nanobeams atomic force microscopy numerical simulations full-spectrum mechanical properties

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Decision-Making Aid for Human-Machine Teaming in Multiplayer Pursuit-Evasion Games

Decision-Making Aid for Human-Machine Teaming in Multiplayer...

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Sachidanandam, Sarjana Oradiambalam Honarvar, Sara Elliott, D. Sawyer Hicks, Gregory P. Diaz-Mercado, Yancy University of Maryland Department of Mechanical Engineering College ParkMD20740 United States Johns Hopkins University Applied Physics Laboratory Guidance Navigation and Controls Group AMDS LaurelMD20723 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Effective decision-making in adversarial multiplayer games is complicated by the large number of degrees-of-freedom in state-action pairs by the players. Difficulty is exacerbated by complex objectives that often develop in strategic deployment of tactics that coordinate multiple objectives. In this paper, we consider the decision-making problem for human-machine teaming to facilitate strategic command and control. We formulate decision-making problems for multiplayer pursuit-evasion games with multiple strategic objectives of varying complexity, such as capturing an evader, or steering it away or towards parts of the domain. We test the complexity of decision-making tactics through human-subject experiments. Operators are able to command a team of pursuers by selecting formations and motion primitives from a library of tactics to influence an evader’s behavior. The designed interface allows the operator to perform practice trials in simulation that enable testing various strategies and examine time-risk before deployment on hardware platforms. Through surveys and metrics, we show that such an interface is found to be useful for decision-making by users. Performance was not impacted in any significant manner by the number of practice trials. This result suggests the impact a decision-making aid could have on improving performance in command and control of human-machine teams. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Man machine systems

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Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Rui Lin, Tong Luo, Jiaming Chen, Xiaotong Blackert, Elizabeth R. Moon, Alyssa R. JeBailey, Khalil M. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States Program Rice University Houston United States

ISBN: (纸本)9781957171258

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO3. We designed planar ultrafast concentrators that amplifies transient electric field by 6 times and measured an average field of 0.5 GV/m in an optically resolvable area in the far field. © 2023 The Author(s)

关键词： Perovskite

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Probing mechanical Properties: Tools for Investigating Solid Polymer Electrolytes 2

Probing Mechanical Properties: Tools for Investigating Solid...

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2nd International Conference on Multidisciplinary engineering and applied Science, ICMEAS 2023

作者： Obi, Uchenna C. Bello, Abdulhakeem Odette, Ngasoh F. Anosike-Francis, Esther N. Anye, Vitalis C. Oyelade, Omolara Victoria African University of Science and Technology Department of Materials Science and Engineering Abuja Nigeria African University of Science and Technology Theoretical and Applied Physics Abuja Nigeria Nile University of Nigeria Department of Mechanical Engineering Abuja Nigeria Bingham University Department of Physics New Karu Nigeria

ISBN: (纸本)9798350358834

Lithium-ion batteries (LIBs) have become an essential energy storage technology for a variety of applications, such as energy storage systems, electric vehicles, and flexible electronics. However, due to safety concerns regarding the flammability of the liquid electrolytes used in conventional LIBs, their use has been restricted;thus, there is considerable interest in the use of solid polymer electrolytes (SPEs) and other solid electrolytes. These SPEs inhibit the growth of lithium dendrites and prevent thermal runaway, which is responsible for the instability of liquid electrolytes. Despite this, SPEs have inferior mechanical properties, resulting in a reduced battery cycle life. Thus, SPEs have been modified by incorporating particles, particularly nanoparticles, into their polymer matrix in order to improve their mechanical properties. Due to their inherent properties, including a large surface area and mechanical rigidity, these nanoparticles improve the interfacial contact and electrochemical stability of these modified SPEs. Consequently, it is essential to investigate the mechanical properties of these SPEs using appropriate techniques. Even though numerous reports have investigated the mechanical properties of some of these SPEs, there is insufficient literature on the tools/techniques for analyzing these mechanical properties. In this review, the experimental techniques used to explore the mechanical properties of SPEs are described. © 2023 IEEE.

关键词： Lithium-ion batteries

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Experimental study of mechanical properties of Sisal/banana fiber hybrid sandwich composite

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Materials Today: Proceedings 2022年 68卷 1793-1799页

作者： Chithra Devi, R. Girimurugan, R. Nanthakumar, S. Rajasekaran, P. Hasane Ahammad, S.K. Joe Patrick Gnanaraj, S. Department of Physics N.K.R.Government Arts College for Women Tamil Nadu Namakkal India Department of Mechanical Engineering Nandha College of Technology Tamil Nadu Perundurai India Department of Mechanical Engineering PSG Institute of Technology and Applied Research Tamilnadu Coimbatore India Department of Mechanical Engineering Er. Perumal Manimekalai Engineering College Tamilnadu Hosur India Department of Electronics and Communication Engineering Koneru Lakshmaiah Education Foundation Andhra Pradesh India Department of Mechanical Engineering St. Mother Theresa Engineering College Tamil Nadu India

Composites are becoming increasingly popular as a result of their useful features, like higher strength-to-weight ratio, higher modulus-to-weight ratio, resistance to corrosion and abrasive resistance. The purpose of this study is to examine the impact of moisture absorption on the mechanical characteristics of hybridized sandwich composite scaffolds made from epoxy resin, strengthened by woven fabrics of banana (B) and Sisal (S) fibers, and a fundamental layer of polyethylene foam (F). The buildings in this investigation were made using a hand layup approach. Samples of the composite are submerged in room-temperature water for varying amounts of time to determine the fibers' water absorption qualities. Several sandwich composite constructions are made and compared to a composite made from 100% Sisal fiber. According to the results, including foam into the Sisal/banana fibres increases their mechanical qualities. However, the composites' tensile, flexural, and impact strengths were diminished after prolonged exposure to water due to water permeating the fibre/matrix contact. © 2022

关键词： Water absorption

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