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Origin of low coercivity of high La-Ce-containing Nd-Fe-B sintered magnets

Rare Metals 2021年第1期40卷 180-184页

作者： Zhi Li Yu-Qing Li Wei-Qiang Liu Dan Wu Hao Chen Wei-Xing Xia Ming Yue College of Materials Science and Engineering Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo 315201China

The origin of low coercivity of high La-Cecontaining Nd-Fe-B sintered magnets was analyzed based on characterization of the microstructure,magnetic domain structure,and magnetization reversal *** can be found that the coercivity of magnet decreases sharply and the ratio value of coercivity(H_(cj))to anisotropic field(H_(A))is below the theoretical value when the amount of La-Ce substitution for Nd is more than 40 wt%.The grain boundaries with poor magnetic isolation in the high La-Cecontaining Nd-Fe-B sintered magnets play an important role in reducing the coercivity of the *** addition,a larger proportion of the reversible portions can be found for the magnet with a large content of La-Ce,which will lead to the low performance of the magnet.

关键词： La-Ce-containing Nd-Fe-B sintered magnets Magnetic properties Magnetic domain Magnetization reversal

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One-step preparation of modified photothermal-driven melamine foam with gradient wettability for oil-waterseparation

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Frontiers of Materials science 2024年第3期18卷 71-82页

作者： Mengdan Jia Mei-Chen Lin Hai-Tao Ren Bing-Chiuan Shiu Ching-Wen Lou Zhi-Ke Wang Li-Yan Liu Ting-Ting Li Innovation Platform of Intelligent and Energy-Saving Textiles School of Textile Science and EngineeringTiangongUniversityTianjin 300387China Tianjin and Ministry of Education Key Laboratory for Advanced Textile Composite Materials Tiangong UniversityTianjin 300387China Department of Biomedical Engineering College of Biomedical EngineeringChina Medical UniversityTaichung 404333China College of Material and Chemical Engineering Minjiang UniversityFuzhou 350108China Department of Bioinformatics and Medical Engineering AsiaUniversityTaichung 413305China Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung 404333China Advanced Medical Care and Protection Technology Research Center College of Textile and ClothingQingdaoUniversityQingdao 266071China Department of Textile and Clothing Shandong Vocational College of Science and TechnologyWeifang 261053China

The absorption of high-viscosity oil by traditional oil absorbing materials has always been a *** there is an urgent need to solve the problem of slow absorption of high-viscosity *** this work,an emulsion composed of polydimethylsiloxane(PDMS),carbon black(CB)and waterborne polyurethane(solid content 40%)was sprayed on the melamine foam(MF).After volatilization of organic solvents,the photothermal material CB was fixed on the MF framework,making it *** raising the temperature of the modified foam to accelerate the internal thermal movement of high-viscosity oil molecules around the foam,intermolecular forces are reduced,thereby accelerating the separation *** absorption capacity of this modified MF towards organic solvents and oil is up to 79 times its own *** addition,the mechanical properties of the modified foam are improved to a certain extent,more conducive to the continuous oil-water *** photothermal absorption material provides ideas for the rapid removal of high-viscosity oil,heavy oil,etc.

关键词： photothermal high-viscosity oil oil-water separation

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Mechanics model of inner core debonding of interface-reinforced composite honeycomb sandwich beam 5

Mechanics model of inner core debonding of interface-reinfor...

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5th International Conference on Material science and technology, ICMST 2025

作者： Xue, Pengcheng Xiong, Jian Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

ISBN: (纸本)9781510691742

Enhanced face-core interfacial bonding performance increases the sensitivity of the structure to core defects. The debonding failure of the inner core in an interface-reinforced composite honeycomb sandwich beam is studied through theoretical modeling and experimental testing. Utilizing the principles of minimum potential energy, Timoshenko's beam theory as well as the Extended High Order Sandwich Panel Theory (EHSAPT), a theoretical model is formulated to clarify the mechanism of inner core debonding. The exponential cohesive zone model (CZM) is used to represent the interfacial mechanical responses of both the face-core and inner core interfaces. Additionally, the theoretical model incorporates the mechanical mechanism of dual crack propagation. The interface-reinforced composite honeycomb sandwich beams are fabricated and the double cantilever beam (DCB) experiments are carried out to reveal the debonding mechanism. The theoretical findings are in accordance with the experimental data when comparing the load-displacement curves and the debonding mode. © 2025 SPIE. All rights reserved.

关键词： Debonding

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高效光催化二氧化碳还原钻单原子催化剂的多尺度结构工程

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science China Materials 2024年第4期67卷 1292-1300页

作者：王榆惠郑天宇金昱丞孙婷婷丁旭王萧徐清梅李彤轩张少龙姜建壮 Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline MaterialsDepartment of Chemistry and Chemical EngineeringSchool of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China

人工光合作用将二氧化碳转化为增值化学品和燃料,在克服全球环境能源危机方面具有巨大潜力.然而,由于CO_(2)的热力学稳定性和动力学滞后性,开发高效的CO_(2)RR光催化剂是一个巨大的挑战.本文在微介孔氮掺杂碳(0.8-Co-ISAS/MMNC-900)上... 详细信息

人工光合作用将二氧化碳转化为增值化学品和燃料,在克服全球环境能源危机方面具有巨大潜力.然而,由于CO_(2)的热力学稳定性和动力学滞后性,开发高效的CO_(2)RR光催化剂是一个巨大的挑战.本文在微介孔氮掺杂碳(0.8-Co-ISAS/MMNC-900)上制备了一种具有高度分散Co单原子位的分级多孔钴单原子光催化剂,该催化剂显著促进了CO_(2)-to-CO的光还原.0.8-Co-ISAS/MMNC-900催化剂的CO生成速率高达7261μmol g^(-1)h^(-1),CO选择性高达90.1%,并且在四次循环测试中表现出良好的稳定性.实验数据和理论结果表明,分层多孔结构可以促进电荷分离引起的外部局部电场的形成,Co隔离的单原子位和微介孔构型协同作用,促进光激发电子积累、CO_(2)吸附活化和*COOH中间体的形成.本研究通过多尺度多孔结构工程,提出了一种合成CO_(2)还原光催化剂的新策略.

关键词：单原子热力学稳定性激发电子光还原多尺度结构人工光合作用多孔结构电荷分离

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边缘电子态调制实现效率超过15%的锡基钙钛矿太阳电池（英文）

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science China Materials 2025年第5期68卷 1462-1471页

作者：左晨刘庚灵刘聪龚安稳陈凯钟杨徐鑫熊文涛狄大卫胡笑添刘焘谈利承邹炳锁陈义旺 State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of ResourcesEnvironment and MaterialsGuangxi University Key Laboratory of Bioinorganic and Synthetic Chemistry (Mo 5 Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen University Institute of Polymers and Energy Chemistry (IPEC)/Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC) Nanchang University DGUT-CNAM Institute Dongguan University of Technology State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University

锡基钙钛矿的严重p型掺杂效应和本征缺陷极大地限制了锡基钙钛矿太阳电池（PSCs）器件性能.本研究提出了一种新型n型有机小分子掺杂剂, NDI2HD-Br2,以缓解锡基钙钛矿的严重p型自掺杂并钝化锡相关缺陷. NDI2HD-Br2中具有高电子密度的羰基... 详细信息

锡基钙钛矿的严重p型掺杂效应和本征缺陷极大地限制了锡基钙钛矿太阳电池（PSCs）器件性能.本研究提出了一种新型n型有机小分子掺杂剂, NDI2HD-Br2,以缓解锡基钙钛矿的严重p型自掺杂并钝化锡相关缺陷. NDI2HD-Br2中具有高电子密度的羰基（C=O）可以向钙钛矿带边提供额外的电子,从而将锡基钙钛矿从p型转化为弱n型半导体（费米能级上移0.15 eV）.通过这种方法,锡基PSCs的功率转换效率（PCE）达到15.01%,开路电压高达0.95 V.此外,掺入NDI2HD-Br2的器件具有出色的长期稳定性,在氮气环境中存储1500小时后仍能保持81%的初始PCE.这项研究为调控锡基钙钛矿的电子结构并钝化其本征缺陷以实现高效稳定的太阳能电池提供了一条新途径.

关键词： perovskite solar cells tin electron transfer defects weak n-type

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Laser-induced breakdown spectroscopy as a method for millimeter-scale inspection of surface flatness

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Plasma science and technology 2024年第9期26卷 148-155页

作者： Jinrui YE Yaju LI Zhao ZHANG Xinwei WANG Kewei TAO Qiang ZENG Liangwen CHEN Dongbin QIAN Shaofeng ZHANG Lei YANG Xinwen MA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000People’s Republic of China Advanced Energy Science and Technology Guangdong LaboratoryHuizhou 516000People’s Republic of China University of the Chinese Academy of Sciences Beijing 100049People’s Republic of China Key Laboratory of Atomic and Molecular Physics&Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070People’s Republic of China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China

A non-contact method for millimeter-scale inspection of material surface flatness via Laser-Induced Breakdown Spectroscopy(LIBS)is investigated *** experiment is performed using a planished surface of an alloy steel sample to simulate its various flatness,ranging from 0 to 4.4 mm,by adjusting the laser focal plane to the surface distance with a step length of 0.2 *** is found that LIBS measurements are successful in inspecting the flatness differences among these simulated cases,implying that the method investigated here is *** is also found that,for achieving the inspection of surface flatness within such a wide range,when univariate analysis is applied,a piecewise calibration model must be *** is due to the complex dependence of plasma formation conditions on the surface flatness,which inevitably complicates the inspection *** solve the problem,a multivariate analysis with the help of Back-Propagation Neural Network(BPNN)algorithms is applied to further construct the calibration *** detailed analysis of the model performance,we demonstrate that a unified calibration model can be well established based on BPNN algorithms for unambiguous millimeter-scale range inspection of surface flatness with a resolution of about 0.2 mm.

关键词： laser-induced breakdown spectroscopy machine learning surface flatness

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Optimization of the in vitro biodegradability,cytocompatibility,and wear resistance of the AZ31B alloy by micro-arc oxidation coatings doped with zinc phosphate

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Journal of Materials science & technology 2024年第12期179卷 224-239页

作者： Chao Yang Suihan Cui Ricky KYFu Liyuan Sheng Min Wen Daokui Xu Ying Zhao Yufeng Zheng Paul KChu Zhongzhen Wu School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China Department of Physics Department of Materials Science&Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong Kong 999077China Shenzhen Institute Peking UniversityShenzhen 518057China PKU-HKUST Shenzhen–Hong Kong Institution Shenzhen 518057China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China

As implanted bone fixation materials,magnesium(Mg)alloys have significant advantages because the density and elastic modulus are closest to those of the human bone and they can bio-degrade in the physiological ***,Mg alloys degrade too rapidly and uncontrollably thus hampering clinical *** this study,a highly corrosion-resistant zinc-phosphate-doped micro-arc oxidation(MAO)coating is prepared on the AZ31B alloy,and the degradation process is assessed in *** increasing zinc phosphate concentrations,both the corrosion potentials and charge transfer resistance of the AZ31B alloy coated with MAO coatings increase gradually,while the corrosion current densities di-minish *** tests in the simulated body fluid(SBF)reveal that the increased zinc phos-phate concentration in MAO coating decreases the degradation rate,consequently reducing the release rates of Mg^(2+)and OH-in the physiological micro-environment,which obtains the lowest weight loss of only 5.22%after immersion for 56 *** regulation of degradation provides a weak alkaline environment that is suitable for long-term cell growth and subsequent promotion of bone proliferation,differentiation,mineralization,and *** addition,the zinc-phosphate-doped MAO coat-ings show an improved wear resistance as manifested by a wear rate of only 3.81 x 10^(-5) mm^(3) N^(-1) m^(-1).The results reveal a suitable strategy to improve the properties of biodegradable Mg alloys to balance tissue healing with mechanical degradation.

关键词： Mg alloys MAO coatings Degradation regulation Cytocompatibility Wear resistance

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Discussion on the Mechanism of Hydrostatic Pressure Effect on Anodic Dissolution of X80 Steel

SSRN

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SSRN 2023年

作者： Wu, Shixiong Gao, Zhiming Jia, Hang Liu, Jialiang Hu, Wenbin School of Material Science and Technology Tianjin University Tianjin30072 China Tianjin Key Laboratory of Composite and Functional Materials Tianjin300350 China

High hydrostatic pressure can compress the electric double layer non-uniformly and give a lower value of CH/CD to enhance the difference in electrical potential that drives chemical reaction, which is sure to accelerate anodic dissolution of steel. Within a limited range, its promoting effect on anodic dissolution may contribute to forming thick corrosion product film, which would in turn induce good inhibiting effect on further dissolution;However, when hydrostatic pressure exceeds the critical value of 20Mpa, too high anodic dissolution rate along with promoted Cl- adsorption will deteriorate the protection performance of corrosion product film, and exacerbate local corrosion . © 2023, The Authors. All rights reserved.

关键词： Hydrostatic pressure

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Improving the stability,lithium diffusion dynamics,and specific capacity of SrLi_(2)Ti_(6)O_(14)via ZrO_(2)coating

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Green Energy & Environment 2022年第1期7卷 53-65页

作者： Hong-Li Ding Hai-Tao Yu Xiao-dong Wang Chen-Feng Guo Bing Zheng Ying Xie Ting-Feng Yi Key Laboratory of Functional Inorganic Material Chemistry Ministry of EducationSchool of Chemistry and Materials ScienceHeilongjiang UniversityHarbin150080China College of Material Science and Chemical Engineering Harbin Engineering UniversityHarbin150001China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao066004China Institute of Advanced Electrochemical Energy&School of Materials Science and Engineering Xi'an University of TechnologyXi'anShaanxi710048China

SrLi_(2)Ti_(6)O_(14)(SLTO)coated with different amount of ZrO_(2)was successfully *** as-obtained composites are stacked by a series of particles with a pure phase structure and a good ***,ZrO_(2)coating not only enhances the structural stability of the materials but also facilitates the diffusion of lithium through the SEI *** a result,the redox polarization was reduced,and the reversibility of the electrochemical reaction was ***,SLTO-ZrO_(2)-2 sample delivers a high initial lithiation capacity of 283.6 mA h g^(-1),and the values maintain at 251.7,228.0,207.4,175.3,and 147.7 mA h g^(-1)at the current densities of 0.13,0.26,0.54,1.31,and 2.62 A g^(-1),*** experiment also confirmed that SLTO materials coated with ZrO_(2)are suitable for high power density applications,and the lithiation specific energy efficiency of SLTO-ZrO_(2)-2 is 200%as high as that of pure SLTO at a power density of 1257 W kg^(-1).

关键词： SrLi_(2)Ti_(6)O_(14) ZrO_(2)coating Structural stability Anode material Electrochemical performance

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Novel lead-free NaNbO_(3) -based relaxor antiferroelectric ceramics with ultrahigh energy storage density and high efficiency

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Journal of Materiomics 2022年第2期8卷 295-301页

作者： Jie Jiang Xiongjie Li Ling Li Shun Guo Ji Zhang Jing Wang Heguo Zhu Yiping Wang Shan-Tao Zhang School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied Science&Jiangsu Key Laboratory of Artificial Functional Materials&Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The development of environmentally friendly ceramics for electrostatic energy storage has drawn growing interest due to the wide application in high power and/or pulsed power electronic ***,it is difficult to simultaneously achieve ultrahigh recoverable energy storage density(W rec>8 J/cm^(3))and high efficiency(η>80%),which restricts their application in the miniaturized,light weight and easy integrated electronic ***,the novel NaNbO_(3)-(Bi_(0.8)Sr_(0.2))(Fe_(0.9) Nb_(0.1))O_(3) relaxor antiferro-electric ceramics,which integrates the merits of antiferroelectrics and relaxors,are demonstrated to exhibit stabilized antiferroelectric phase and enhanced dielectric relaxor *** particular impor-tance is that the 0.88NN-0.12BSFN ceramic achieves giant electric breakdown strength E_(b)=98.3 kV/mm,ultrahigh W _(rec)=16.5 J/cm^(3) and high h=83.3%,as well as excellent frequency,cycling and thermal reliability *** comprehensive energy storage performance of NN-BSFN not only out-performs state-of-the-art dielectric ceramics by comparison,but also displays outstanding potential for next-generation energy storage capacitors.

关键词： Lead-free NaNbO_(3) Relaxor antiferroelectric Energy storage property

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