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Structural characterization and strengthening mechanism of forsterite nanostructured scaffolds synthesized by multistep sintering method

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Journal of Materials Science & technology 2018年第12期34卷 2263-2270页

作者： Fariborz Tavangarian Abbas Fahami Guoqiang Li Mohammadhassan Kazemi Anoosha Forghani Mechanical Engineering Program School of ScienceEngineering and TechnologyPennsylvania State University Department of Mechanical Engineering Texas A&M University Department of Mechanical and industrial Engineering Louisiana State University Department of Mechanical and Aerospace Engineering University at Buffalo Department of Biomedical Engineering Millennium Science ComplexPennsylvania State UniversityUniversity Park

In this study, highly porous forsterite scaffolds with interconnected porosities were synthesized using multi-step sintering(MSS) method. The starting powder was nanosized forsterite, which was synthesized from talc and magnesium carbonate powders. The phase composition, average particle size and morphology of the produced forsterite powder were characterized by X-ray diffraction technique(XRD) and transition electron microscopy(TEM). Forsterite scaffolds were produced by foamy method using polymeric sponges. MSS process including three steps was used to efficiently sinter the forsterite nanopowders without destroying the initial porous structure of polymeric sponges. The results showed that MSS technique is an efficient and appropriate procedure to produce highly porous forsterite scaffolds with pore size in the range of 100-300 μm. The compressive strength, compressive modulus and porosity of C12 specimen(sintered at 1650℃ for 1 h with subsequent annealing at 1000℃ for 1000 min) was 1.88 MPa, 29.2 MPa, and 72.4%, respectively, which is very close to that of cancellous bone. The approach studied in this research can be developed for other nanostructure ceramics to produce highly porous scaffolds with interconnected porosities for load bearing applications.

关键词： Forsterite Multi-step sintering Scaffolds Porosity

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Severely deformed copper by equal channel angular pressing

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Progress in Natural Science:Materials International 2017年第2期27卷 244-250页

作者： M.Ebrahimi C.Gode Department of Mechanical Engineering University of Maragheh School of Denizli Vocational Technology Program of MachinePamukkale University

mechanical and microstructural analysis of equal channel angular pressed copper was experimentally investigated. The results showed that the hardness distribution uniformity was rapidly decreased after the first pass and gradually improved at the following passes. Also, the bottom region of the pressed material experienced lower Vickers hardness magnitude irrespective of pass number. Furthermore, the addition of 0.1%magnesium to the pure copper had a considerable effect on the distribution uniformity. In addition, the material fracture mode changed from ductile to brittle by the alteration of the dimples to cleavage planes ***, the formability index was dramatically reduced after the first pass and slowly improved at the succeeding passes. Eventually, ECAP process led to the increment of low angle grain boundaries and the decrease of high angle grain boundaries at the initial passes and vice versa at the subsequent ones.

关键词： Pure copper Equal channel angular pressing mechanical properties Impact test Microstructural observation

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ACCELERATED WEAR TESTING USING THE GRIT SIZE EFFECT

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WEAR 1993年第PART A期162卷 126-131页

作者： FORREST, D MATSUOKA, K TSE, MK RABINOWICZ, E Tribology Research Program Department of Mechanical Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA

This paper describes a technique for wear prediction. It has been empirically established that the wear rate of an abraded workpiece is directly related to the grit size of the abrasive. Using this relationship, the wear rate of material subjected to very mild abrasion can be predicted from the measured wear rates of the same material under more severe conditions. This technique has been successfully applied to estimate the wear of magnetic recording head materials in a video tape system. Our results demonstrate that the wear rate of the head can be accelerated by as much as four orders of magnitude using abrasive lapping tapes of large grit size. The results also indicate that the wear rate of the recording head material decreases significantly with the magnetic or abrasive tape wear, which typically occurs during the first five to ten tape passes. Microscopic examination using scanning electron microscopy indicates that this reduction in wear rate is not due to clogging of the abrasive tape but rather to changes in abrasive particle shape. This means a recording head subjected to continuous sliding with fresh tape will wear considerably faster than a head which slides repeatedly against a loop of tape. Accordingly, in reporting the wear rates of head materials, it is important to describe the corresponding tape condition or usage history explicitly.

关键词： Wear of materials

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EXTENDED VACANCY-VACANCY LIQUID MODEL

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METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 1995年第10期26卷 2597-2610页

作者： BREBRICK, RF YU, TC Materials Science and Engineering Program Department of Mechanical Engineering Marquette University Milwaukee Trace Storage Technology Taiwan Republic of China

A quasicrystalline model of a binary liquid in which two sublattices containing randomly distributed vacancies is developed via statistical thermodynamics. The relative partial molar quantities are obtained. The constraints imposed upon the adjustable model parameters to ensure that the Schottky constant increases with increasing temperature but never exceeds unity are developed, as well as the constraints entering upon application to a AC system forming a congruently melting, narrow homogeneity-range compound AC (s). The model is an extension of an earlier version for liquids and of analogous models for narrow homogeneity-range compounds, AC (s), in that the excess Gibbs energies of vacancy creation are cubic functions of the atomic fraction. The model is also an alternative to associated solution models which would assume a single equiatomic associated species. The model is then applied to systems of varying polarity but all forming a narrow homogeneity-range crystalline compound whose stoichiometric composition is 50 at. pct. Quantitatively good fits are obtained for the Hg-Te, Cd-Te, Zn-Te, and Pb-Te systems and, for the first three systems, are comparable to fits obtained with the associated solution model using the same experimental data. Quantitatively good fits are also obtained for the less polar In-Sb and Ga-Sb systems, and these are comparable to those obtained by us with a Margules-type model in which the enthalpy of mixing for the liquid is a quartic function of atom fraction and a quadratic function of temperature. Finally, the predictions for the enthalpy of mixing at temperatures above the present range of experimental data are given and discussed for the various systems and models. It appears the model given here is appropriate for the type of systems tested.

关键词： Binary alloys

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Synergistic thermal and surface area properties of Al₂O₃–TiO₂/water hybrid nanofluids

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Djentoe, Yokanan Gustino Widiasto, Farrel Yoga Effendi, Hilbran Tama Dida Musabbikhah Hartati, Sri Santoso, Budi Kristiawan, Budi Wijayanta, Agung Tri Department of Mechanical Engineering Faculty of Engineering Universitas Sebelas Maret Jl. Ir. Sutami 36A Kentingan Surakarta 57126 Indonesia Master Program of Mechanical Engineering of Engineering Universitas Sebelas Maret Jl. Ir. Sutami 36A Kentingan Surakarta 57126 Indonesia Department of Mechanical Engineering Sekolah Tinggi Teknologi “Warga” Surakarta Jl. Raya Solo – Baki KM 2 Grogol Sukoharjo 57552 Indonesia Department of Agricultural Technology Universitas Veteran Bangun Nusantara Jl. Letnan Jenderal Sujono Humardani 1 Gadingan Jombor Bendosari Sukoharjo 57521 Indonesia Research Group of Sustainable Thermofluids Universitas Sebelas Maret Jl. Ir. Sutami 36A Kentingan Surakarta 57126 Indonesia

This work investigated experimentally on synergistic thermal and surface area properties of water-based Al2O3–TiO2 hybrid nanoparticles at a given volume ratio (50:50). Morphology and structure characterization were ... 详细信息

This work investigated experimentally on synergistic thermal and surface area properties of water-based Al₂O₃–TiO₂ hybrid nanoparticles at a given volume ratio (50:50). Morphology and structure characterization were performed using Transmission Electron Microscope (TEM) and Surface Area Analysis (SAA), while thermal properties were analyzed using a thermal properties analyzer. The aims of this study were to investigate morphology and structure characterization and to evaluate thermal behavior using Transient Line Heat Source (TLHS), including thermal conductivity, heat capacity, and diffusivity. TEM micrographs revealed that TiO₂ and Al₂O₃ nanoparticles were characterized by fractal-like arrangements and quasi-spherical morphology, respectively. The structural analysis of TiO₂ and Al₂O₃ nanoparticles reveals a mesoporous structure with curve isotherm type IV that has loop hysteresis characteristics. The thermal durability of the water-based Al₂O₃–TiO₂ hybrid nanoparticles is shown to have a strong relationship with the Moldoveanu model, confirming the trend of increasing thermal durability with a decrease in temperature as a result of increased nanoparticle mobility. According to this study, thermal behavior indicates that there are differences in temperature between 20 and 65 °C. Heat capacity increases significantly from 4 to 8 MJ/m²·K, with the fastest change occurring between 20 and 30 °C, whereas thermal diffusivity is bounded between 0 and 0.2 mm²/s. All of this highlights the potential applications in analysis and energy storage, highlighting the transfer characteristics of nanomaterials that are useful. The potential of hybrid nanofluids in long-term thermal management systems is demonstrated in this case study. © 2025 The Authors

关键词： Hybrid nanofluid Specific heat Thermal conductivity Thermal property

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High-Performance Silicon Anodes Enabled by Multifunctional Ultrafine Silica Nanoparticle-Embedded Carbon Coatings for Lithium-Ion Batteries

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Advanced Energy Materials 2025年第0期

作者： Sun, Zhefei Yin, Quanzhi Zhou, Shenghui Chen, Haoyu Wen, Sifan Yang, Huiping Wu, Xiaoyu Pan, Jianhai Han, Jiajia Yang, Hui Zhuang, Zilong Feng, Shijie Zhang, Li Peng, Dong-Liang Zhang, Qiaobao State Key Laboratory of Physical Chemistry of Solid Surfaces College of Materials Xiamen University Xiamen361005 China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Tan Kah Kee Innovation Laboratory Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University Fujian Xiamen361005 China State Key Laboratory of Material Processing and Die & Mould Technology Department of Mechanics School of Aerospace Engineering Huazhong University of Science and Technology Hubei Wuhan430074 China Department of Mechanical Engineering University of Wisconsin-Madison MadisonWI53706 United States Materials Science and Engineering Program University of California San Diego La JollaCA92093 United States Longmen Laboratory Henan Luoyang471023 China

Silicon (Si) holds immense promise as viable anode for next-generation high-energy-density Li-ion batteries (LIBs). However, its poor ionic/electronic conductivity and significant volumetric changes during cycling lead to rapidly deteriorated LIB performance. Here, a novel multifunctional coating featuring ultrafine SiO2 nanoparticles (2-C) to resolve these challenges is proposed. This unique uSiO2-C coating provides high-efficient electron and ion transport pathways, while also improves interfacial stability and mitigates volume changes during cycling, thereby enhancing the conductivity and structural integrity of Si@uSiO2-C, as corroborated by extensive experimental and computational studies. In addition, the abundant interfaces in uSiO2-C coating facilitate Li+ transport and the evenly distributed ultrafine SiO2 nanoparticles impart high electrochemical reactivity and mechanical robustness. Consequently, the Si@uSiO2-C anode achieves a high reversible capacity of 2093 mAh g−1 at 0.2 A g−1, with a high initial Coulombic efficiency of 88.3%, superior rate capability and durability (1000 cycles, 928 mAh g−1 at 1.0 A g−1, 75% capacity retention). Full cells paired with commercial LiFePO4 cathodes demonstrate high cyclability, maintaining 80% capacity retention over 500 cycles at 4 C. This work highlights the vital role of multifunctional coating in promoting the electrochemical performance of Si-based anodes for high-performance LIBs. © 2025 Wiley-VCH GmbH.

关键词： SiO2 nanoparticles

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Drivetrain simulation using variational autoencoders

arXiv

引用

arXiv 2025年

作者： Sharma, Pallavi Urrea-Quintero, Jorge-Humberto Bogdan, Bogdan Ciotec, Adrian-Dumitru Vasilie, Laura Wessels, Henning Skull, Matteo Porsche Engineering Etzelstraße 1 Bietigheim-Bissingen74321 Germany Graduate Program Computational Sciences in Engineering Technische Universität Braunschweig Braunschweig Germany Fraunhofer Institute for Energy Economics and Energy System Technology Joseph-Beuys-Straße 8 Kassel34117 Germany Institute of Applied Mechanics Division Data-Driven Modeling of Mechanical Systems Technische Universität Braunschweig Pockelsstraße 3 Braunschweig38106 Germany

This work proposes variational autoencoders (VAEs) to predict a vehicle’s jerk from a given torque demand, addressing the limitations of sparse real-world datasets. Specifically, we implement unconditional and conditional VAEs to generate jerk signals that integrate features from different drivetrain scenarios. The VAEs are trained on experimental data collected from two variants of a fully electric SUV, which differ in maximum torque delivery and drivetrain configuration. New meaningful jerk signals are generated within an engineering context through the interpretation of the VAE’s latent space. A performance comparison with baseline physics-based and hybrid models confirms the effectiveness of the VAEs. We show that VAEs bypass the need for exhaustive manual system parametrization while maintaining physical plausibility by conditioning data generation on specific inputs. © 2025, CC BY.

关键词： Signal encoding

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Laser-assisted deposition of Cu bumps for microelectronic packaging

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中国有色金属学会会刊：英文版 2012年第S3期22卷 683-687页

作者： Won-Seok CHOI Joohan KIM Department of Nano IT Fusion Program Seoul National University of Science and Technology Department of Mechanical and Automotive Engineering Seoul National University of Science and Technology

Cu bump was transferred using a focused laser pulse for microelectronic *** Nd:YAG laser pulse (maximum energy of 500 mJ;wavelength of 1064 nm;fluences of 0.4-2.1 kJ/cm2) was irradiated on a sacrificial absorption layer with copper *** focused laser beam induced plasma between the semi-transparent donor slide and the sacrificial layer,causing a shock *** shock wave pressure pushed the Cu layer and transferred material to deposit a bump on substrate.A beam-shaper was used to produce uniform pressure at the interface to reduce fragmentation of the transferred material on the *** calculated shock wave pressure with respect to laser fluence was 1-3 GPa.A Cu bump of diameter of 200 μm was successfully deposited at laser fluence of 0.6 kJ/cm *** pressure control at the sacrificial layer using a laser pulse was critical to produce a bump with less *** technique can be applied to forming Cu bump for an interconnecting process in electronics.

关键词： laser induced forward transfer bump deposition Nd:YAG pulsed laser micro system packaging beam shaping

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Advances in filler-crosslinked membranes for hydrogen fuel cells in sustainable energy generation

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International Journal of Hydrogen Energy 2025年 140卷 745-776页

作者： Aminul Islam Mamun Shahriar Md. Tarekul Islam Siow Hwa Teo M. Azizur R. Khan Yun Hin Taufiq-Yap Suman C. Mohanta Ariyan Islam Rehan Adiba Islam Rasee Khadiza Tul Kubra Md. Munjur Hasan Md. Shad Salman R.M. Waliullah Md. Nazmul Hasan Md. Chanmiya Sheikh Tetsuya Uchida Mrs Eti Awual Mohammed Sohrab Hossain Hussein Znad Md. Rabiul Awual Department of Petroleum and Mining Engineering Jashore University of Science and Technology Jashore 7408 Bangladesh College of Engineering Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea Department of Chemistry Jashore University of Science and Technology Jashore 7408 Bangladesh Department of Leather Engineering Faculty of Mechanical Engineering Khulna University of Engineering and Technology Khulna 9203 Bangladesh Industrial Chemistry Program Faculty of Science and Natural Resources Universiti Malaysia Sabah 88400 Kota Kinabalu Sabah Malaysia Catalysis Science and Technology Research Centre Faculty of Science Universiti Putra Malaysia Serdang 43400 Malaysia Department of Chemistry School of Science The University of Tokyo 7-3-1 Bunkyo-ku Tokyo 113-0033 Japan Department of Chemistry Graduate School of Science Osaka University Osaka 560-0043 Japan Institute for Chemical Research Kyoto University Gokasho Uji Kyoto 611-0011 Japan Division of Applied Chemistry Graduate School of Natural Science and Technology Okayama University 1-1 Tsushima-naka 3-Chome Okayama 700-8530 Japan Western Australian School of Mines: Minerals Energy and Chemical Engineering Curtin University GPO Box U 1987 Perth WA 6845 Australia

Fuel cell membranes can be used in various ways to achieve zero-emission transport and energy systems, which offer a promising way to power production due to their higher efficiency compared to the internal combustion engine and the eco-environment. Perfluoro sulfonic acid membranes used for proton exchange membranes (PEMs) have certain drawbacks, like higher fuel permeability and expense, lower mechanical and chemical durability, and proton conductivity under low humidity and above 80 °C temperature. Researchers have drawn their attention to the production of polymer electrolyte membranes with higher proton conductivity, thermal and chemical resilience, maximum power density, lower fuel permeability, and lower expense. For sustainable clean energy generation, a review covering the most useful features of advanced material-associated membranes would be of great benefit to all interested communities. This paper endeavors to explore several types of novel inorganic fillers and crosslinking agents, which have been incorporated into membrane matrices to design the desired properties for an advanced fuel cell system. Membrane parameters such as proton conductivity, the ability of H 2 transport, and the stability of the membrane are described. Research directions for developing fuel cell membranes are addressed based on several challenges suggested. The technological advancement of nanostructured materials for fuel cell applications is believed to significantly promote the future clean energy generation technology in practice.

关键词： Advanced materials Fuel cell Hydrogen gas generation Proton exchange membrane Polymer

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MICROSTRUCTURE-BASED PROCESSING PARAMETERS OF THERMOPLASTIC COMPOSITE-MATERIALS .1. THEORETICAL-MODELS

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POLYMER COMPOSITES 1994年第1期15卷 34-41页

作者： YANG, HC COLTON, JS Composites Manufacturing Research Program School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia 30332‐0405

Processing parameters for composites are predicted by new models which are based on the microstructure of the composite. Three types of thermoplastic prepregs are considered, ICI tape, BASF commingled tow, and CCMI powder coated tow. The permeability of the composites depends on their fiber distribution. The elastic behavior of the fiber network compression depends on the fiber orientation. These two are integrated to predict the processing parameters.

关键词： Microstructure

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