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Potential application of graphene nanoplatelets as a high temperature lubricant for hot rolling

Friction 2022年第11期10卷 1810-1823页

作者： Long WANG Anh Kiet TIEU Ming MA Jiaqing LI Guojuan HAI Hongtao ZHU State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710021China School of Mechanical MaterialsMechatronic and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongNorthfields AvenueWollongongNSW 2522Australia State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Graphene has been shown to be a promising solid lubricant to reduce friction and wear of the sliding counterparts,and currently is reported to only function below 600℃.In this study,its potential as a lubricant above 600℃ was studied using a ball-on-disc tribo-meter and a rolling *** results suggest that a reduction up to 50%can be obtained with graphene nanoplatelets(GnP)under lubricated conditions between 600 and 700℃ when compared with dry *** this friction reduction can last more than 3 *** 800 and 900℃,the friction reduction is stable for 70 and 40 s,respectively,which indicates that GnP can potentially provide an effective lubrication for hot metal forming *** rolling experiments on steel strips indicate that GnP reduces the rolling force by 11%,7.4%,and 6.9%at 795,890,and 960℃,*** friction reductions are attributed to the easily sheared GnP between the rubbing interfaces.A temperature higher than 600℃ will lead to the gasification of the residual graphene on the strip surface,which is believed to reduce the black contamination from traditional graphite lubricant.

关键词： graphene high temperature lubricant hot rolling tribology properties

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Modulation of microstructure and properties of Cu−Ni−Sn alloy by addition of trace Ti

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Transactions of Nonferrous Metals Society of China 2024年第12期34卷 3978-3991页

作者： Ying-lin HU Zi-luo CHENG Xiao-na LI Zhu-min LI Yuan-di HOU Min LI Mian YANG Yue-hong ZHENG Chuang DONG School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Key Laboratory of Materials Modification by Laser Ion and Electron BeamsMinistry of EducationDalian University of TechnologyDalian 116024China School of Materials Science and Engineering Anhui Polytechnic UniversityWuhu 241000China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The segregation of Sn and discontinuous precipitation at grain boundaries are detrimental to the strength,ductility,and machinability of the Cu−Ni−Sn alloy.A strategy to solve the above problems is multi-component composition design by introducing strong enthalpic interaction *** this work,a series of Cu_(80)Ni_(15)Sn_(5−x)Ti_(x)(at.%)alloys were designed by cluster-plus-glue-atom model,and the effects of Ti content on the microstructure and properties of the alloys were systematically investigated using TEM and other analysis *** results demonstrate that Ti can effectively inhibit the segregation and discontinuous precipitation while promoting continuous precipitation to improve the high-temperature stability of the *** the Ti content increases,the distribution of Ti changes from uniform distribution to predominant *** hardness and conductivity of the alloy exceed those of the C72900(Cu−15Ni−8Sn(wt.%))commercial alloy and the Cu_(80)Ni_(15)Sn_(5)(at.%)reference alloy when Ti is in the solution state.

关键词： Cu−Ni−Sn alloy microstructure properties cluster-plus-glue-atom model segregation discontinuous precipitation enthalpic interaction

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通过表面终止化学设计实现高度可逆的锌金属阳极

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Science Bulletin 2023年第23期68卷 2993-3002,M0005页

作者：刘宇陈树麟袁豪熊方宇刘琴安永康张建勇吴璐孙建国 Yong-Wei Zhang 安琴友 John Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore Institute of High Performance Computing Agency for ScienceTechnology and Research(A*Star)Singapore 138632Singapore Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*Star)Singapore 138634Singapore

锌表面自然形成的非均匀氧化层(ZnO)会与电解液发生反应形成Zn_(4)(OH)_(6)SO_(4)·xH_(2)O(ZSH)副产物,导致锌负极表面非均匀沉积,从而阻碍水性锌离子电池实际应用.为了排除氧化层分布形式的影响,本文利用表面终止化学设计策略在... 详细信息

锌表面自然形成的非均匀氧化层(ZnO)会与电解液发生反应形成Zn_(4)(OH)_(6)SO_(4)·xH_(2)O(ZSH)副产物,导致锌负极表面非均匀沉积,从而阻碍水性锌离子电池实际应用.为了排除氧化层分布形式的影响,本文利用表面终止化学设计策略在锌负极表面制备了一层完全氧化的ZnO层,研究发现锌负极均匀分布的ZnO层会原位演化形成致密的ZSH功能层.均匀且致密的ZSH能够有效隔绝电解液的腐蚀,从而有效提高锌负极界面的稳定性.此外,ZSH(002)晶面边缘的不饱和悬空键(如-O)更容易和Zn(H_(2)O)_(6)^(2+)结构中的锌离子形成强Zn-O键,可以促进Zn(H_(2)O)_(6)^(2+)的脱溶剂化和锌离子沿边扩散,实现了高度可逆的锌沉积行为并限制了副反应.基于此,本文提出与“表面脱水-晶体通道转移”机制明显不同的“边缘脱水-沿边缘转移”锌离子输运新机制.更重要的是,基于此组装的全电池显示出高循环稳定性(超过1000次循环)和高库仑效率(99.07%),验证了其潜在的实际应用价值.

关键词： Zn-O termination Zn Anode Solid electrolyte interphase Dendrite-free Zn ion battery

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Halogenated Thienoacene Derivatives with Improved Emission Properties

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Chemical Research in Chinese Universities 2024年第4期40卷 699-703页

作者： ZHANG Jingmei MENG Zhihao ZHEN Yonggang HE Ping YU Panpan HU Wenping Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing100029P.R.China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074P.R.China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian116024P.R.China Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province China West Normal UniversityNanchong637000P.R.China Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang330022P.R.China MOE Key Laboratory of Organic Integrated Circuits&Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of SciencesTianjin UniversityTianjin300072P.R.China

Thienoacenes is one of most important groups of semiconducting materials due to the high stability and superior ***,there are scarce studies on the emission properties of thienoacenes to ***,we synthesized fluorinated and chlorinated dibenzo[d,d’]thieno[3,2-b;4,5-b’]dithiophenes(DBTDTs)derivatives F6-DBTDT and Cl6-DBTDT by sulfoxide cyclization,significantly lowering the energy levels relative to the parent compound *** to single crystal structure analysis,F6-DBTDT molecules adopt one-dimensional slipped stacking with closeπ-πinteractions of 3.43Å(1Å=0.1 nm),which is different from the parent compound DBTDT with herringbone stacking ***,the halogenated DBTDT derivatives exhibit enhanced emission properties both in solution and in the solid state,opening up possiblities to improve photoluminescence of thienoacences by halogenation.

关键词： Thienoacene Halogenation Photoluminescence Aggregation structure

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Effect of Co Content on Microstructure and Mechanical Properties of High-Entropy High-Temperature Shape Memory Alloy

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稀有金属材料与工程 2025年第1期54卷 10-16页

作者： Zhao Yanchun Jin Bo Feng Yuanfei Ma Huwen Yu Zhiqi Feng Li Liaw Peter K State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China Wenzhou Pump and Valve Engineering Research Institute of Lanzhou University of Technology Wenzhou 325105China Department of Materials Science and Engineering University of TennesseeKnoxville TN37996USA

(TiZrHf)_(50)Ni_(30)Cu_(20-x)Co_(x)(x=2,4,6,at%)high-entropy high-temperature shape memory alloys were fabricated by watercooled copper crucible in a magnetic levitation vacuum melting furnace,and the effects of Co content on microstructure and mechanical properties were *** results indicate that the grain size of the alloy decreases with increasing the Co *** the as-cast state,the alloy consists primarily of the B19′phase,with a trace of B2 *** fracture morphology is predominantly composed of the B19′phase,whereas the B2 phase is nearly *** the Co content or reducing the sample dimensions(d)markedly enhance the compressive strength and ductility of the *** d=2 mm,the(TiZrHf)_(50)Ni_(30)Cu_(14)Co_(6) alloy demonstrates the optimal mechanical properties,achieving a compressive strength of 2142.39±1.8 MPa and a plasticity of 17.31±0.3%.The compressive cyclic test shows that with increasing the compressive strain,the residual strain of the(TiZrHf)_(50)Ni_(30)Cu_(14)Co_(6) alloy increases while the recovery ability *** superelastic recovery capability of the alloy is continuously *** superelastic recovery rate increases from 1.36%to 2.12%,the residual strain rate rises from 1.79%to 5.52%,the elastic recovery rate ascends from 3.86%to 7.36%,while the total recovery rate declines from 74.48%to 63.20%.

关键词： high-temperature shape memory alloy high-entropy alloy microstructure mechanical property

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Tellurium intervened Fe-N codoped carbon for improved oxygen reduction reaction and high-performance Zn-air batteries

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Journal of materials Science & technology 2023年第6期137卷 215-222页

作者： Rui Wang Zihan Meng Xuemin Yan Tian Tian Ming Lei Rami Adel Pashameah Hala MAbo-Dief Hassan Algadi Nina Huang Zhanhu Guo Haolin Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen ValleyFoshan 528200China College of Chemistry and Environmental Engineering Yangtze UniversityJingzhou 434023China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMakkah 24230Saudi Arabia Department of Science and Technology University College-RanyahTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Electrical Engineering Faculty of EngineeringNajran UniversityP.O.Box 1988Najran 11001Saudi Arabia College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical and Bimolecular Engineering Integrated Composites Laboratory(ICL)University of TennesseeKnoxvilleTN 37996USA Guangdong Hydrogen Energy Institute of WHUT Xianhu Hydrogen ValleyFoshan 528200China

Pyrolysis-acquired iron and nitrogen codoped carbon(Fe-N-C)has been comprehensively investigated for its promising oxygen reduction reaction(ORR)catalytic performance and structural *** modification of non-metal elements with larger atomic radius and the corresponding intrinsic microstructure-property relations are rarely *** this study,tellurium(Te)intervened Fe-N-C was prepared by micelles-induced polymerization with Te nanowires as an in-situ intervening *** out-plane bonding of Te with Fe induced the increase of both N content and proportion of pyridinic N on the material surface,thus improving the ORR catalytic *** assembled Zn-air battery demonstrated a maximum power density of 250 mW/cm^(2)and excellent rate capability under various discharge current densities,which was much better than the Pt/***,the current work demonstrates a novel Te/Fe-N-C material and reveals an original Te intervened Fe-N-C strategy and N reconfiguration mechanism,which is of great significance for the design of key materials in energy-related fields.

关键词： Te/Fe-N-C Assembly ORR Electrocatalysis Zn-air battery

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Recent progress of scalable perovskite solar cells and modules

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Energy Reviews 2022年第2期1卷 38-59页

作者： Fei Wang Yu Han Dawei Duan Chuangye Ge Hanlin Hu Gang Li Hoffman Institute of Advanced Materials Shenzhen Polytechnic7098 Liuxian BoulevardShenzhen518055China Department of Electronic and Information Engineering Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina The Hong Kong Polytechnic University Shenzhen Research Institute GuangdongShenzhen518057China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhanChina

The rapid development of perovskite solar cells(PSCs)over the past decade makes it the most promising next generation photovoltaic *** progress in efficiency and stability has been demonstrated in laboratory level,while endeavours are extremely required to enable successful transfer of the printable PSC technology to industry scale toward *** this work,recent progresses on upscaling of PSCs are systematically *** with the traditional PSC structure,we have analyzed the specially designed configuration for perovskite solar modules(PSMs).The comprehensive overview and assessment are provided for the technologies engineering in large-scale preparation,including both solution processing and vapor-phase deposition *** the promoting effect of material engineering to scale up PSMs,the application of additive engineering,solvent engineering and interface engineering on the stability and efficiency of PSMs is systematacially ***,the effect of current packaging technology of PSMs on device lifetime and environmental friendliness is *** last,we propose the prospects and challenges of PSMs commercialization in the future to meet the requirements for next generation photovoltaic industry.

关键词： Perovskites Photovoltaics Large-scale device Modules

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A superior strength-ductility synergy of Al_(0.1)CrFeCoNi high-entropy alloy with fully recrystallized ultrafine grains and annealing twins

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Journal of materials Science & technology 2022年第36期131卷 185-194页

作者： Jiahao Li Kejie Lu Xiaojun Zhao Xinkai Ma Fuguo Li Hongbo Pan Jieming Chen Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Shenzhen Institute of Southwest Jiaotong University Shenzhen 518000China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling(Anhui University of Technology) 243002 MaanshanChina Luoyang Ship Material Research Institute Luoyang 471023China

Grain refinement usually makes the materials stronger,while ductility has a dramatic ***,a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained(UFG)Al_(0.1)CrFeCoNi with abundant annealing twins was achieved by cold rolling at room temperature and short-time *** microstructure characterization using electron backscattered scattering diffraction demonstrates that abundant geometrically necessary dislocations(GNDs)gather around the grain boundaries and twin boundaries after tensile *** coarse-grained(CG)samples undergo a larger plastic deformation than UFG samples,the GND density decreases with grain size ranging from UFG to *** electron microscopy results reveal that the annealing twin boundary,which effectively hinders the dislocation slip and stores dislocation in grain interior,and the activation of multiple deformation twins are responsible for the superior strength–ductility synergy and work hardening *** addition,the yield strength of fully recrystallized Al_(0.1)CrFeCoNi follows a Hall–Petch relationship(σ_y=24+676d^(–1/2)),where d takes into account both grain boundaries and annealing twin *** strengthening effects of grain boundaries and annealing twin boundaries were also evaluated separately.

关键词： High-entropy alloy Ultrafine grains Annealing twins Strength Ductility

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Extension of Highly Efficient Alcohol-promoted Rearrangement into One-pot Domino Palladium-catalyzed Carbonylation for Sterically Crowded Aromatic Six-membered Imides

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Chemical Research in Chinese Universities 2023年第6期39卷 1106-1110页

作者： GUO Rong ZHANG Jingmei JIA Xiaohui SHI Chunfeng QIE Fengxiang ZHEN Yonggang Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029P.R.China State Key Laboratory of Catalytic Materials and Reaction Engineering Research Institute of Petroleum ProcessingSINOPECBeijing 100083P.R.China National Demonstration Center for Experimental Life Sciences&Biotechnology Education Beijing Normal University100875 BeijingP.R.China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074P.R.China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275P.R.China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024P.R.China

Aromatic six-membered imides suffer the introduction of bulky substituents at the imide positions due to the formation of isoimides and low reactivity,preventing from the investigation of the intrinsic molecular ***,we found a highly efficient alcohol-promoted rearrangement from isonaphthalimide to naphthalimide under acid or basic nonaqueous conditions,which can be regarded as model compounds for aromatic six-membered *** proposed two-step nucleophilic substitutions in the isomerization mechanistic pathways that were verified by the separation of a key ***,in-situ ^(1)H NMR exhibited the first-order kinetics for the isoimide loss ***,the alcohol-promoted isoimide-imide rearrangement was extended to a palladium-catalyzed one-pot domino carbonylation reaction toward sterically crowded aromatic six-membered imides.

关键词： Bulky aromatic imide Imide isomerization Domino synthesis Organic semiconductor

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Introduction of the interfacial layer between filler and matrix: An effective approach towards developing high thermal conductive dielectric composite

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Ceramics International 2025年

作者： Shen, Jie Chen, Xian Qi, Yu He, Wenhao Li, Qiangzhi Zhang, Jiayi Zhou, Jing Chen, Wen Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Sanya Science and Education Innovation Park Wuhan University of Technology Sanya572024 China

In the development of high-performance electronic devices, high thermal conductive dielectric composites are crucial. For PTFE-based dielectric composites, enhancing thermal conductivity while maintaining low dielectric properties remains a challenge. The key issue lies in the high interfacial thermal resistance between fillers and the PTFE matrix, which restricts the improvement of thermal conductivity. This paper focuses on introducing an interfacial layer between the filler and the matrix as an effective approach. By constructing a SiO2 interfacial layer between hBN and PTFE, we formed hBN@SiO2 core-shell structured fillers and then prepared hBN@SiO2/PTFE composites. This method significantly reduces the interfacial thermal resistance. Consequently, the thermal conductivity of the composite reaches 1.40 W/(m·K), the coefficient of thermal expansion decreases, and it still keeps a low dielectric constant of 3.9 and low dielectric loss of 1 × 10−4. This study provides an innovative and effective way for the development of high thermal conductive dielectric composites, which is of great significance for high-power and high-frequency applications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Dielectric losses

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