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Rare-earth-niobate high-entropy ceramic foams with enhanced thermal insulation performance

Journal of materials Science & technology 2022年第21期116卷 94-102页

作者： R.W.Yang Y.P.Liang J.Xu X.Y.Meng J.T.Zhu S.Y.Cao M.Y.Wei R.X.Zhang J.L.Yang F.Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China NPU-QMUL Joint Research Institute of Advanced Materials and Structure Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

The introduction of porous structures into high-entropy ceramics is expected to further improve its thermal insulation *** this work,a series of novel rare-earth-niobate high-entropy ceramic foams((Dy_(0.2)Ho_(0.2)Y_(0.2)Er_(0.2)Yb_(0.2))_(3)NbO_(7))with hierarchical pore structures were prepared by a particle-stabilized foaming ***-scale analysis reveals that high entropy causes atom displacement and lattice *** high-entropy ceramic foams exhibit high porosity(90.13%-96.13%)and ultralow thermal conductivity(0.0343-0.0592 W/(m·K))at room ***-entropy ceramic foam prepared by a 20 wt%slurry sintered at 1500℃has the porosity of 96.12%and extremely low thermal conductivity of 0.0343 W/(m·K).The existence of walls and secondary pores contributes to reduced thermal *** is a temperature difference of over 800℃between frontside and backside of the sample under fire resistance *** research indicates that these as-prepared high-entropy ceramic foams are expected to be promising thermal insulation materials.

关键词： Rare-earth niobate High-entropy ceramic foams Particle-stabilized foaming Atomic-scale analysis Thermal conductivity

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materials genome strategy for metallic glasses

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材料科学技术（英文版） 2023年第35期166卷 173-199页

作者： Zhichao Lu Yibo Zhang Wenyue Li Jinyue Wang Xiongjun Liu Yuan Wu Hui Wang Dong Ma Zhaoping Lu Songshan Lake Material Laboratory Songshan LakeDongguan 523808China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Songshan Lake Material Laboratory Songshan LakeDongguan 523808China Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China

Metallic glasses(MGs)have attracted extensive attention in the past decades due to their unique chem-ical,physical and mechanical properties promising for a wide range of engineering applications.A thor-ough understanding of their structure-property relationships is the key to the development of novel MGs with desirable *** strategies,as proposed by materials Genome Initiative(MGI),construct a new paradigm for high-throughput materials discovery and design,and are being increas-ingly implemented in the search of new *** a few reports have summarized the application of high-throughput and/or machine learning techniques,a comprehensive assessment of materials genome strategies for developing MGs is still ***,this paper aims to present a timely overview of key advances in this fascinating subject,as well as current challenges and future opportunities.A holistic approach is used to cover the related topics,including high-throughput preparation and characterization of MGs,and data-driven machine learning strategies for accelerating the development of novel ***-nally,future research directions and perspectives for MGI-assisted design of MGs are also proposed and surmised.

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All-Climate Stretchable Dendrite-Free Zn-Ion Hybrid Supercapacitors Enabled by Hydrogel Electrolyte Engineering

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Energy & Environmental materials 2023年第2期6卷 381-388页

作者： Yuqi Jiang Kun Ma Meiling Sun Yuanyuan Li Jinping Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Hybrid supercapacitors have shown great potentials to fulfill the demand of future diverse applications such as electric vehicles and portable/wearable *** particular,aqueous zinc-ion hybrid supercapacitors(ZHSCs)have gained much attention due to their low-cost,high energy density,and environmental ***,typical ZHSCs use Zn metal anode and normal liquid electrolyte,causing the dendrite issue,restricted working temperature,and inferior device ***,a novel flexible Zn-ion hybrid supercapacitor(FZHSC)is developed by using activated carbon(AC)anode,δ-MnO_(2) cathode,and innovative PVA-based gel *** this design,heavy Zn anode and its dendrite issue are avoided and layered cathode with large interlayer spacing is *** addition,flexible electrodes are prepared and integrated with an anti-freezing,stretchable,and compressible hydrogel electrolyte,which is attained by simultaneously using glycerol additive and freezing/thawing technique to regulate the hydrogen bond and *** resulting FZHSC exhibits good rate capability,high energy density(47.86 Wh kg^(−1);3.94 mWh cm^(−3)),high power density(5.81 kW kg^(−1);480 mW cm^(−3)),and excellent cycling stability(~91%capacity retention after 30000 cycles).Furthermore,our FZHSC demonstrates outstanding flexibility with capacitance almost unchanged even after various continuous shape *** hydrogel electrolyte still maintains high ionic conductivity at ultralow temperatures(≤−30℃),enabling the FZHSC cycled well,and powering electronic timer robustly within an all-climate temperature range of−30~80℃.This work highlights that the promising Zn metal-free aqueous ZHSCs can be designed with great multifunctionality for more practical application scenarios.

关键词： all-climate operation dendrite-free anode high flexibility multifunctional gel electrolyte Zn-ion hybrid supercapacitor

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Microstructures,Thermal and Mechanical Properties of Pure Tungsten—A Comparison Between Selective Laser Melting and Hot Rolling

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 219-226页

作者： Chong Wang Daobing Chen Yan Zhou Zhuoming Xie Qianfeng Fang Shifeng Wen Chunze Yan State Key Laboratory of Material Processing and Die&Mold Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Faculty of Engineering China University of GeosciencesWuhan 430074China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China

A comparative study on the influence of different manufacturing methods(selective laser melting and hot rolling)on the microstructure,mechanical and thermal behaviours of tungsten(W)was presented for the first *** results indicated that the selective laser melting(SLM)W exhibited a finer grain sizes,a lower strength ductility,hardness and thermal conductivity compared to hot-rolled *** main reason for this result was that the laser underwent rapid heating and cooling when it was used to melt W powder with high energy density,resulting in large internal stress in the sample after ***,the internal stress was released,leading to the generation of microcracks at the grain boundaries,thereby affecting the performance of SLM W *** addition,the higher fraction of high-angle grain boundaries(HAGBs)of SLM W was found to be the key factor for intrinsic *** the HAGBs are the preferred crack paths,which could promote crack propagation and decrease fracture energy.

关键词： Tungsten(W) Selective laser melting(SLM) Hot rolling Microstructure Thermal conductivity Mechanical property

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Measurement viewpoint planning method for sheet metal parts with strong reflection

Measurement viewpoint planning method for sheet metal parts ...

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2022 International Conference on Optical and Photonic Engineering, icOPEN 2022

作者： Su, Yu'e Zhang, Pan Yang, Qingpeng Wang, Congjun Zhong, Kai Li, Zhongwei State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen51800 China

ISBN: (纸本)9781510661905

Limited by the imaging dynamic range of the camera, the phenomenon of over-exposure and over-dark often occurs in the 3D measurement of strong reflective sheet metal parts, resulting in incomplete measurement result. One of existing methods such as multiple exposure can measure most of the visible area under a single viewpoint, but the visible area with too small or too large incidence angle still cannot be measured. To solve this problem, in this paper, a method of viewpoint planning for sheet metal parts with strong reflection is proposed. The method introduces the surface reflection model of reflective sheet metal parts into viewpoint planning to achieve the synchronous optimum of measurement efficiency and data integrity. Firstly, according to the measurable region of the surface structured light 3D measurement system and CAD model, the candidate viewpoint set is randomly generated in the sampling space, and the visibility matrix is constructed by analyzing whether each candidate viewpoint is visible to each patch of the model. Then, the surface reflection model of sheet metal parts with strong reflection is constructed, and the reflection coefficient of the visible patches under each viewpoint is calculated according to the reflection model. Based on this, the measurability of the visible patches of the viewpoint under multiple exposures is calculated, and the visibility matrix is updated. Lastly, through the viewpoint quality evaluation function constructed based on the data coverage increment and multiple-exposure time, the viewpoint with the highest quality is selected heuristically until the coverage requirement is met. Experiments show that the algorithm can improve the measurement efficiency and ensure the integrity of the measurement data. © 2022 SPIE.

关键词： Visibility

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Co/Zn-metal organic frameworks derived functional matrix for highly active amorphous Se stabilization and advanced lithium storage

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Rare Metals 2023年第1期42卷 76-84页

作者： Hong Yu Jin-Zhao Kang Long-Sheng Huang Jin-Jin Wang Xiao-Mei Wang Xiang-Yuan Zhao Cheng-Feng Du State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an710072China Northwestern Polytechnical University Chongqing Technology Innovation Center Chongqing400000China College of Chemistry and Chemical Engineering Hubei UniversityWuhan430062China

Lithium-selenium batteries,as an advanced rechargeable battery system,have attracted wide ***,its application is hurdled by the ambiguous underlying mechanism such as the unclear active phase and the key role of the host ***,a three-dimensional(3D) functional matrix derived from the Co/Znmetal organic framework is synthesized to unravel the questions *** reveals that the strong interaction and voids in the 3D matrix serve to anchor the amorphous Se with high electrochemical *** obtained 3DC/Se exhibits 544.2 and 273.2 mAh·g^(-1) t current densities of 0.1C and 2.0C,respectively,with a diffusion-controlled *** excessive amount of Se beyond the loading capacity of the matrix leads to the formation of trigonal phase Se,which shows an unsatisfying electrochemical property.

关键词： Metal-organic frameworks(MOFs) Amorphous Se Functional matrix Li-Se batteries

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Specific Ion Effects on the Enzymatic Degradation of Polyester Films

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Chinese Journal of Polymer Science 2023年第4期41卷 476-482,I0005页

作者： Jian Zhang Jie Zhu Zan Hua Guang-Ming Liu Department of Chemical Physics Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education InstitutesUniversity of Science and Technology of ChinaHefei230026China Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province College of Material and Textile EngineeringJiaxing UniversityJiaxing314001China Biomass Molecular Engineering Center and Department of Materials Science and Engineering School of Forestry and Landscape ArchitectureAnhui Agricultural UniversityHefei230036China

Soil environment on earth contains a variety of ions,which are expected to play a vital role in the biodegradation of plastics discarded in the *** this work,poly(butyleneadipate-co-terephthalate)(PBAT)is employed as a model biodegradable plastic to study the specific ion effects on the enzymatic degradation of polyester *** results show that the specific ion effects on the enzymatic degradation rate of the PBAT films and on the catalytic rate constant for the enzymatic hydrolysis of the ester bonds are strongly dependent on temperature and ionic *** the enzymatic degradation rate and catalytic rate constant decrease following the trends Na^(+)>K^(+)>Ca^(2+)and Cl^(-)>SO_(4)^(2-)>NO_(3)^(-)for cations and anions,respectively,indicating that the ion-specific enzymatic degradation of the PBAT films is closely correlated with the specific ion effects on enzymatic hydrolysis of the ester *** study shows that the specific ion effects on the enzyme activity can be understood by taking into account the ion-specific cation-anion interaction,ionic dispersion force,salting-out effect and salting-in *** study of specific ion effects on the enzymatic hydrolysis of the ester bonds and the resultant enzymatic degradation of the PBAT films would offer us a new clue to develop new biodegradable,environmentally friendly synthetic plastics.

关键词： Specific ion effects Biodegradable films Ion-enzyme interactions Enzyme activity

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Influence of pH value and Zn/Ce cations ratio on the microstructures and corrosion resistance of LDH coating on AZ31

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Corrosion Communications 2022年第1期5卷 73-86页

作者： Vahdat Zahedi Asl Jingmao Zhao Yahya Palizdar Muhammad Junaid Anjum College of Material Science and Engineering Beijing University of Chemical Technology Beijing Key Laboratory of Electrochemical Process and Technology for Materials Nanotechnology and Advanced Materials Department Materials and Energy Research Center

To prepare a compact and anti-corrosion Zn-Ce LDH coating on AZ31 magnesium alloy,the various molar ratios of Zn/Ce cations,and different pH values were employed during preparation of the precursor *** composition,morphology,structure,and wettability of the deposited coatings were comprehensively characterized via scanning electronic microscopy （SEM）,energy-dispersive X-ray spectroscopy （EDS）,X-ray diffraction （XRD）,X-ray photoelectron spectroscopy （XPS）,Fourier transform infrared spectroscopy （FT-IR） and the static sessile drop ***,potentiodynamic polarization （PDP） and electrochemical impedance spectroscopy （EIS）measurements were conducted to evaluate the corrosion resistance of the coatings ***,the selfhealing ability of the coating was investigated by monitoring the scratched areas of the samples immersed in 3.5%NaCl solution for a long time up to 21 *** results reveal that the coated Mg alloy shows the lowest corrosion current density (icorr=1.29×10-8A/cm2) when the Zn/Ce ratio is 2,and the pH value of the precursor solution is approximately 11.

关键词： LDH coating Magnesium alloy Corrosion protection Self-healing Cerium XPS

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Research on Pattern Recognition Performance of Control Chart Based on Deep Learning

Research on Pattern Recognition Performance of Control Chart...

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2022 Global Conference on Robotics, Artificial Intelligence and Information technology, GCRAIT 2022

作者： Chen, Deyin Zan, Tao Ma, Zhiqian Wang, Min Gao, Xiangsheng Liu, Zhihao Beijing University of Technology Beijing Key Laboratory of Advanced Manufacturing Technology Faculty of Material and Manufacturing Beijing China

ISBN: (数字)9781665481922

ISBN: (纸本)9781665481922

This paper is aiming at the problem that the existing anomaly discrimination methods of control chart can not realize the discrimination of complex anomaly data and the low level of intelligence. It is exploring the performance of control chart pattern recognition based on deep learning. It briefly introduces 1DCNN, LSTM and BiLSTM then adopts a neural network model based on 1DCNN+BiLSTM. The Monte Carlo method is used to generate the simulation data of the control chart, and different abnormal data are generated by changing the parameters for simulation experiments. According to the effect of control chart pattern recognition under different abnormal data, the training samples are optimized and the parameters of the network model are determined. The results show that the proposed method performs better in recognition. © 2022 IEEE.

关键词： Long short-term memory

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View Planning for Inspection of Sheet Metal Parts based on Markov Decision Process

View Planning for Inspection of Sheet Metal Parts based on M...

引用

2022 International Conference on Optical and Photonic Engineering, icOPEN 2022

作者： Yang, Qingpeng Zhang, Pan Su, Yu'e Huang, Yi Zhong, Kai Li, Zhongwei State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen51800 China

ISBN: (纸本)9781510661905

The automatic 3D measurement technology based on surface structured light has been widely used in the production of metal sheet parts. Before the measurement, it is necessary to manually plan the robot's measurement viewpoint and path, and each viewpoint needs to take into account the measurement quality of the shape surface and holes at the same time. The planning is very difficult, and manual planning results in long offline debugging time and low measurement efficiency. To address this problem, this paper proposes a view planning method that focuses on holes of metal sheet part. Firstly, the relationship between view angle and hole reconstruction quality is constructed to analyze the influence of view angle on hole measurement. Then, candidate viewpoints, which meet the visibility and hole reconstruction quality requirement, are generated. Finally, the Markov decision process is used to model the coverage planning problem, and the Monte Carlo tree search method is used to generate the shortest viewpoint sequence which meets the coverage ratio requirements. The experimental results show that the method proposed in this paper can realize the complete measurement of complex surface features such as holes, and plan an efficient robotic measurement path. © 2022 SPIE.

关键词： Markov processes

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