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SSRN 2024年

作者： Wu, Zhenjiang Chen, Shuqun Shao, Mengxue Liu, Yue Li, Yangzhong Peng, Jian Li, Hongyi Wang, Jinshu Key Laboratory of Advanced Functional Materials Education Ministry of China College of Materials and Engineering Beijing University of Technology Beijing100124 China Beijing University of Technology China High Performance Computing Department National Supercomputing Center in Shenzhen Guangdong Shenzhen518055 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Boronizing of nickel based superalloys is of great interests in aerospace industry due to the excellent wear resistance, however, little information has been known on its phase formation and load-dependent wear mechanism. In this work, high quality boronized layer was developed on the Inconel 718 alloy by powder pack-boriding process at 850 °C for 6 h under argon atmosphere. The microstructure characteristics and load-dependent tribological behaviors of the boronized layers were systematically investigate. It is found that the main boronized layer on Inconel 718 alloy consists of a ~11.3 um thick compound layer with nanocrystalline (Ni,Fe)23B6 and (Cr,Fe)B grains, and a ~10.9 um thick diffusion layer with dendritic Cr2B precipitation within the matrix. The phase evolution of the boronizing layer are explainable by thermodynamic modeling of Ni-Cr-B system and the phase stability for metastable Ni-B compounds is confirmed by DFT simulation. Due to the good interfacial bonding strength and high microhardness value, the boronized layer displays excellent wear resistance against Si3N4 ceramic balls at room temperature. In particular, the wear rates of the specimens under applied loads of 10-20 N are higher than those in the 50-100 N loads case. The latter is mainly facilitated by the formation of lubricating boron oxide tribolayer on friction ball surface. We believe the findings in present work will contribute to a deeper understanding of the boronizing treatment in nickel-based superalloys. © 2024, The Authors. All rights reserved.

关键词： Wear resistance

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High-Pressure And High-Temperature synthesis of Black Phosphorus-Graphite Anode material for Lithium-Ion Batteries

SSRN

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SSRN 2023年

作者： Cheng, Zhikang Tu, Bingtian Wu, Ye Huang, Haijun School of Science Wuhan University of Technology Hubei Wuhan430070 China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Hubei Xiangyang441000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China

Phosphorus-based materials with a high theoretical specific capacity and a fast charge-discharge rate are considered as promising anode materials for high energy density lithium-ion batteries (LIBs). Red phosphorus (RP) and black phosphorus (BP) are two main allotropes to be used as anode materials. However, huge volume expansion during charge-discharge processes hinders the application of RP and BP in LIBs. Composites of phosphorus and carbon-based materials have been extensively fabricated to withstand volume expansion of phosphorus and improve cycle performance. Here, composites of BP and graphite (BP-G) with three P-G mass ratios (8 : 2, 7 : 3, and 6 : 4) have been synthesized by a facile and scalab.e high-pressure and high-temperature (HPHT) method using RP and graphite composites (RP-G) prepared by ball milling as precursors. Their microstructure and bonding configurations have been analyzed by various characterization techniques. Among three RP-G composites, 7RP-3G exhibits the most excellent cycling stability, a high reversible capacity of 1331 mAh/g after 200 cycles at a current density of 0.78 A/g. However, RP-G composites show poor stability at high current densities. Among three BP-G composites, 6BP-4G shows the best cycle stability at high current densities, a reversible capacity of 634.6 mAh/g after 500 cycles at a current density of 2.6 A/g. Although, the reversible specific capacities of BP-G composites after long cycles are lower than those of RP-G, BP-G composites show more stable cycle performance than RP-G, especially at high current densities. The present work illustrates a direct and facile method to synthesize BP-G composites, and sheds light to explore new synthetic route of BP-based composites. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Enhanced the Impact Resistance by Gradient Face-Sheet Design of a Sandwich Structure

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SSRN 2023年

作者： Wei, Jing Luo, Guoqiang Liu, Ao Wei, Qinqin Xia, Zhilin Zhang, Ruizhi Shen, Qiang State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid Physics China Academy of Engineering Physics Mianyang621900 China

Sandwich structure has been designed to reduce the impact damage of the stress waves. However, the existing work focuses on the optimization of sandwich cores while the important face-sheet structure is seldom improved. Here, we used the impedance matching theory to design a negative gradient face-sheet sandwich structure with excellent stress wave attenuation performance. Owing to stress wave attenuation form a high impedance to a low one, the negative gradient face-sheet sandwich structure shows a low peak stress of 5.51 MPa, and the average transmission peak stress is 2.69 MPa. The gradient face-sheet structure changes the compressive deformation behavior;thus, the energy absorption performance of the negative gradient face-sheet sandwich structure increases to be 1311.8 KJ/m3 and the specific energy absorption reaches 1072 J/kg. Finite-element methods further demonstrate the overall sandwich structures can be enhanced through alleviating the failure of sandwich core by a gradient face-sheet structure. This work provides a paradigm for the design of sandwich structures with high energy absorption performance. © 2023, The Authors. All rights reserved.

关键词： Energy absorption

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Study of cellulose/poly-silicate hybrid material thermal property

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第5期28卷 21-23页

作者： Zhang, Gui-Fang Yang, Xi-Ming Wei, Song-Liang Cheng, Bo-Wen Zhang, Lian-Meng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Institute of Fiber Modification and Functional Fiber Tianjin Polytechnic University Tianjin 300160 China

This research is that cellulose/poly-silicate hybrid material was prepared with viscose and poly-silicate by sol-gel method. The influence of aluminum salt and poly-silicate on hybrid material thermal property was studied. Based on the analysis of the DSC and TG curve of hybrid material, we have found that the hybrid material has splendid heat-resistance and fire retardancy.

关键词： Cellulose Hybrid material Poly-silicate Thermal property

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Fabrication and electrical properties of Mo/SiO2 composites

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第1期29卷 15-17页

作者： Chen, Hong-Bo Zhou, Jing Shen, Qiang Zhang, Lian-Meng State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Science and Technology Branch of Jingmen Jingmen 448000 China

Mo/SiO2 composites with different mass compositions were sintered by spark plasma sintering (SPS) technique. The mechanism of sintering and densifications were studied and the relationship between the distribution of Mo in composites and the electrical property was discussed. The result indicated that there was no reaction between Mo and SiO2;the composites are mechanically mixed instead. Partly softened SiO2 and the particles of Mo filling the hole facilitated the compact of Mo/SiO2 composites. When the mass composition of Mo was less than 35%, the particles of Mo dispersed individually in SiO2 and the composite was an insulator;when that exceeds 40%, the composite was a conductor due to the connection of the particles of Mo.

关键词： Electrical property Mo/SiO2 composite Network structure Spark plasma sintering (SPS)

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Modeling and simulation of PEM fuel cell based on electrochemical model

Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/...

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Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of technology (Transportation Science and Engineering) 2008年第5期32卷 933-936页

作者： Xu, Lamei Xiao, Jinsheng Pan, Mu Yuan, Runzhang State Key Lab of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China School of Automation Wuhan University of Technology Wuhan 430070 China School of Automobile Wuhan University of Technology Wuhan 430070 China

Based on the electrochemical model, a simulation model has been developed with Matlab.Simulink. Steady-state analysis has been developed to evaluate how the temperature affect the voltage and output power of the fuel cell. Dynamic analysis focus on the dynamic response of the output voltage, the output power, the consumed power, the efficiency and the internal resistance of a single PEMFC when the current of a PEMFC increase or decrease transiently. This simulation model also adapted to the simulation of PEMFC stack. The study is helpful for the optimization and control of PEMFC.

关键词： Electrochemical model Modeling Proton exchange membrane fuel cell (PEMFC) Simulation

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High-temperature plasmonic thermal emitter for thermo-photovoltaics

High-temperature plasmonic thermal emitter for thermo-photov...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jingjing Liu Urcan Guler Wei Li Alexander V. Kildishev Alexandra Boltasseva Vladimir M. Shalaev School of Electrical & Computer Eneineering and Birck Nanotechnology Center. Purdue Universitv. West Lafayette IN USA State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Department of Photonics Engineering Technical University of Denmark Lyngby Denmark

We use titanium nitride (TiN) to demonstrate an ultra-thin plasmonic thermal emitter operating at high temperatures (830 K). The spectrally selective emitter exhibits a large emittance at around 2.5 μm and below, and... 详细信息

关键词： Tin Plasmons Absorption Thermal stability Wavelength measurement materials Photovoltaic cells

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Effect of Sm2O3 on the densification and thermal conductivity of spark plasma sintered AIN ceramics

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Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal materials and Engineering 2005年第SUPPL. 1 PART 2期34卷 821-822页

作者： Li, Meijuan Zhang, Lianmeng Li, Tao Shen, Qiang Yu, Mingqing Wuhan University of Technology Wuhan 430070 China Research Institute of Synthetic Crystals Beijing 100083 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Aluminum nitride (AlN) ceramic is difficult to sinter through conventional sintering processes. Spark plasma sintering (SPS) was used to sinter it in this study. A pulsed direct current was applied to the AlN powder in SPS. It engendered concentrated heating in the sinter, and then accelerated the diffusion and contact of AlN particle surfaces. With sintering additive Sm 2O3, the AlN powder was sintered into near-theoretical density in a considerably shorter time cycle compared with conventional sintering processes. The effects of quantity of additive Sm2O 3 and sintering temperature on densification of AlN samples were investigated. Results indicated that the addition of Sm2O3 enhanced the densification of AlN ceramic and lowered the sintering temperature. The AlN ceramics prepared by SPS method had homogeneous crystals. The crystals grains grew well. The Sm-Al-O compounds were created in grain boundary by reaction between Sm2O3 and Al 2O3 on AlN particle surface during the sintering. The reaction effectively accelerated the diffusion among the AlN grains, speeded the densifications of the sinter. And it was favorable to preserve the integrity of the AlN crystal lattice. As a result, the AlN sinter obtained a good thermal conductivity, which was as high as 150W/(m·K).

关键词： AlN ceramic Sm2O3 Spark plasma sintering (SPS) Thermal conductivity

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synthesis of Ti2AlC by hot pressing and thermodynamics analysis

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第4期29卷 5-7页

作者： Wang, Ping Mei, Bing-Chu Hong, Xiao-Tin Zhu, Jiao-Qun Zhou, Wei-Bing Yan, Ming School of Sciences Wuhan University of Technology Wuhan 430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Ti2AlC bulk material was synthesized by hot pressing using elemental powder mixture of Ti, Al and active carbon. X-ray diffraction (XRD) in different temperature of hot pressing was used to determine the phase composition and scanning electron microscope (SEM) was observed to investigate the microstructure of samples synthesized respectively. Results show that high purity Ti2AlC bulk material was synthesized by hot pressing elemental powder mixture of 2.0 Ti/1.0 Al/1.0 C at 1500 °C for 60 minutes, in which little TiC and Ti3AlC2 existed as secondary phases. According to the results of thermodynamics calculation, for Ti, Al and C system the most stable compound in thermodynamics was TiC. Moreover, the formation of Ti3AlC2 during the synthesizing progress of Ti2AlC was explained.

关键词： Hot pressing Thermodynamics analysis Ti2AlC

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Combined effects of nonmetallic impurities and planned metallic dopants on grain boundary energy and strength

arXiv

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arXiv 2018年

作者： Huang, Zhifeng Chen, Fei Shen, Qiang Zhang, Lianmeng Rupert, Timothy J. State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Department of Materials Science and Engineering University of California IrvineCA92697 United States

Most research on nanocrystalline alloys has been focused on planned doping of metals with other metallic elements, but nonmetallic impurities are also prevalent in the real world. In this work, we report on the combined effects of metallic dopants and nonmetallic impurities on grain boundary energy and strength using first-principles calculations, with a Σ5 (310) grain boundary in Cu chosen as a model system. We find a clear correlation between the grain boundary energy and the change in excess free volume of doped grain boundaries. A combination of a larger substitutional dopant and an interstitial impurity can fill the excess free volume more efficiently and further reduce the grain boundary energy. We also find that the strengthening effects of dopants and impurities are dominated by the electronic interactions between the host Cu atoms and the two types of dopant elements. For example, the significant competing effects of metal dopants such as Zr, Nb, and Mo with impurities on the grain boundary strength are uncovered from the density of states of the d electrons. As a whole, this work deepens the field's understanding of the interaction between metallic dopants and nonmetallic impurities on grain boundary properties, providing a guide for improving the thermal stability of materials while avoiding embrittling effects. Copyright © 2018, The Authors. All rights reserved.

关键词： Impurities

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