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Slippery Surface with Petal-like Structure for Protecting Al Alloy: Anti-corrosion, Anti-fouling and Anti-icing

Journal of Bionic Engineering 2022年第1期19卷 83-91页

作者： Junfei Huang jiajie kang Jiaxu Zhang Jinxia Huang Zhiguang Guo School of Engineering and Technology China University of GeosciencesBeijing100083China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou451283China

The harsh working environment affects the performance and usage life of Al and its alloys,thus limiting their application.In recent years,Slippery Liquid-infused Porous Surface(SLIPS)has attracted much attention due to excellent anti-corrosion,anti-fouling and anti-icing properties.This may be an effective way to improve the properties of Al and its alloys.Here,the SLIPS with petal-like structure was constructed on the Al alloy via simple hydrothermal reaction,Stearic Acid(STA)modification and lubricant injection.A variety of droplets(including oil-in-water emulsions)can slide on the SLIPS at a low angle,even the Sliding Angle(SA)of the water droplet is only 3°.Furthermore,the SLIPS exhibits outstanding mechanical and chemical properties.It can maintain fine oil-locking ability under high shearing force and keep slippery stability after immersion in acid/alkaline solutions.In addition,the SLIPS possesses excellent anti-corrosion,anti-fouling and anti-icing properties,which provides a new way to promote the application of Al and its alloys.Therefore,the SLIPS is expected to be an effective way to improve the properties of Al and its alloys,as well as play a role in anti-fouling and self-cleaning in construction,shipbuilding and automotive manufacturing industries,thereby expanding the practical application of Al and its alloys.

关键词： Slippery surface Al alloy Anti-corrosion Anti-fouling Anti-icing

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Development and application of blade-coating technique in organic solar cells

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Nano Research 2023年第9期16卷 11571-11588页

作者： Xin Zhang Hong Zhang Shilin Li Linge Xiao Siwen Zhang Bing Han jiajie kang Huiqiong Zhou China School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and TechnologyBeijing 100190China School of Chemistry Beihang UniversityBeijing 100191China The Department of Thoraciccardio Surgery PLA Rocket Force Characteristic Medical CenterBeijing 100088China

Due to the characteristics of lower material waste,higher crystallinity,roll-to-roll compatibility,and high-throughput continuous processing,blade-coating has been widely applied in the preparation of large-area organic solar cells.In this paper,the technique of blade-coating is introduced,including the effects of blading speed,substrate temperature,and other technological innovations during the process of blade-coating.Besides,the recent progress of blade-coating in organic solar cells is summarized and the active layer prepared by a blade-coating method is introduced in detail,including materials,processing methods,solvents,and additives.The interface layer and electrodes prepared by the blade-coating method are also discussed.Finally,some perspectives on the blade-coating method are proposed.In the foreseeable future,blade-coating will become the core of batch production of large-area organic solar cells,so as to make organic solar cells more competitive.

关键词： blade-coating printable organic solar cells large-area

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Effects of annealing treatment on tribological behavior of tungsten-doped diamond-like carbon film under lubrication(Part 2):Tribological behavior under MoDTC lubrication

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Friction 2022年第7期10卷 1061-1077页

作者： Shaojun ZHANG Lina ZHU Yanyan WANG jiajie kang Haidou WANG Guozheng MA Haipeng HUANG Guang’an ZHANG Wen YUE School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China Zhengzhou Research Institute China University of Geosciences(Beijing)Zhengzhou 451283China National Engineering Research Center for Remanufacturing Beijing 100072China National Key Lab for Remanufacturing Academy of Armored Forces EngineeringBeijing 100072China Beijing Research Institute Sinopec Lubricant Co.Ltd.Beijing 100085China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Molybdenum dialkyldithiocarbamate(MoDTC)is widely used as a friction modifier in engine lubricating oil.Under MoDTC lubrication,the friction and wear behaviors of tungsten-doped diamond-like carbon(W-DLC)films annealed at 100-400℃were discussed and evaluated using scanning electron microscopy(SEM),atomic force microscopy(AFM),and Raman spectroscopy.Under(polymerized alpha olefin)PAO+MoDTC lubrication,the coefficient of friction of all samples decreased,but the wear rates of the W-DLC films annealed at 300℃increased significantly.By interacting with zinc dialkyldithiophosphate(ZDDP),the wear rates of W-DLC films annealed at different temperatures declined significantly owing to the formation of dense phosphate tribofilms on the worn surfaces.

关键词： diamond-like carbon(DLC) annealing friction and wear behaviors molybdenum dialkyldithiocarbamate(MoDTC) zinc dialkyldithiophosphate(ZDDP)

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SPS制备铜基稀土发光复合材料的微观组织及摩擦学性能

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摩擦学学报（中英文） 2024年第4期44卷 460-469页

作者：陈辉康嘉杰于鹤龙宋占永王海斗中国地质大学(北京)工程技术学院北京100083 陆军装甲兵学院装备再制造技术国防科技重点实验室北京100072 陆军装甲兵学院机械产品再制造国家工程研究中心北京100072 中国地质大学(北京)郑州研究院河南郑州451283

以(Ca,Sr)AlSiN_(3):Eu^(2+)荧光粉和铜粉为原料,利用放电等离子烧结(SPS)工艺制备了铜基稀土发光复合材料.采用扫描电镜(SEM)、X射线衍射仪(XRD)、荧光显微镜、显微硬度计、纳米压痕仪以及磨损试验机等研究了(Ca,Sr)AlSiN_(3):Eu^(2+)... 详细信息

以(Ca,Sr)AlSiN_(3):Eu^(2+)荧光粉和铜粉为原料,利用放电等离子烧结(SPS)工艺制备了铜基稀土发光复合材料.采用扫描电镜(SEM)、X射线衍射仪(XRD)、荧光显微镜、显微硬度计、纳米压痕仪以及磨损试验机等研究了(Ca,Sr)AlSiN_(3):Eu^(2+)含量对铜基复合材料微观组织、物相结构、发光性能、微纳力学性能及摩擦学行为的影响.结果表明:适量(Ca,Sr)AlSiN_(3):Eu^(2+)的掺入能够细化铜基质相晶粒,从而提高复合材料硬度与耐磨性.当荧光粉掺入的质量分数为5%时,复合材料拥有较高的硬度和最佳的耐磨性;过量的荧光粉会降低材料致密度和组织均匀性,从而导致复合材料硬度和耐磨性下降.

关键词： (Ca Sr)AlSiN_(3):Eu^(2+) 复合材料微观组织摩擦磨损发光涂层

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Progress of Nondestructive Detection Technology on Remanufacturing Coatings

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稀有金属材料与工程 2012年第S1期41卷 399-402页

作者： kang jiajie Xu Binshi Wang Haidou Wang Chengbiao Acad Armored Forces Engn Natl Key Lab Remfg Beijing 100072 Peoples R China China Univ Geosci Sch Engn & Technol Beijing 100083 Peoples R China

The defects of remanufacturing coatings,such as micro-cracks,micro-pores,oxide inclusion,and fatigue cracks producing in the service process have great influence on the qualities and lives of remanufacturing coatings.This paper summarizes several methods used for detecting coating defects,including ray method,ultrasonic method,eddy method,magnetic memory method,acoustic emission method.The advantages and limitations of the above methods are also discussed.The detection results by ray method are visualized,and it is easy to achieve qualitative,quantitative and locating detection,but this method has incipient fault and low detecting sensitivity.Ultrasonic detection can exactly locate defects,and it is sensitive to plane defects,but the detection has dead zones,and it is inconvenient to perform qualitative and quantitative measurement.Eddy method detects fast,but it only can detect conductive materials,and is difficult to achieve qualitative,quantitative and locating detection.Magnetic memory method is sensitive to ferromagnetic materials,but it can not detect nonferromagnetic materials and is difficult to attain quantitative measurement.Acoustic emission method has an extensive detection range and high sensitivity,but it has big noise interference,and is hard to achieve qualitative detection.In conclusion,it describes the application prospect of each method for detecting coating.

关键词： remanufacturing coating defect nondestructive detection

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Primitive functional groups directed distinct photocatalytic performance of imine-linked donor-acceptor covalent organic frameworks

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Nano Research 2024年第6期17卷 4994-5001页

作者： Xitong Ren jiajie Sun Yusen Li Feng Bai Key Laboratory for Special Functional Materials of Ministry of Education National and Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologySchool of Materials Science and Engineeringand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physics and Electronics Henan UniversityKaifeng 475004China

The combination of donor-acceptor(D-A)structures presents a viable strategy for fabricating covalent organic frameworks(COFs)with exceptional photocatalytic performances.Nevertheless,the selection of functional groups on donor or acceptor building blocks and their effect on the macroscopic properties of COFs are ambiguous.In this study,we tactfully synthesized a pair of Py-DBT-COFs from the same pyrene(Py)donor and 4,7-diphenylbenzo[c][1,2,5]thiadiazole(DBT)acceptor cores with distinct primitive functional groups.The primitive functional groups of building units determine the photocatalytic properties of corresponding Py-DBT-COFs.Specifically,Py-C-DBT-COF synthesized from Py-4CHO and DBT-2NH_(2)showcases a splendid H_(2)evolution rate as high as 21,377.7μmol/(g·h)(with 5 wt.%Pt)originating from better charge transfer capacity,which is significantly superior to that of Py-N-DBT-COF constructed from Py-4NH_(2)and DBT-2CHO.The distinct photocatalytic performances of the two COFs are demonstrated to originate from the different charge separation and transfer capabilities.This work supplies a new avenue for optimizing the photocatalytic performance of D-A COFs from the perspective of primitive functional group selections.

关键词： covalent organic frameworks functional group donor-acceptor photocatalysis

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Predicting microseismic,acoustic emission and electromagnetic radiation data using neural networks

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 616-629页

作者： Yangyang Di Enyuan Wang Zhonghui Li Xiaofei Liu Tao Huang jiajie Yao School of Materials Engineering Changshu Institute of TechnologySuzhou215506China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou221116China School of Safety Engineering China University of Mining and TechnologyXuzhou221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou221116China

Microseism,acoustic emission and electromagnetic radiation(M-A-E)data are usually used for predicting rockburst hazards.However,it is a great challenge to realize the prediction of M-A-E data.In this study,with the aid of a deep learning algorithm,a new method for the prediction of M-A-E data is proposed.In this method,an M-A-E data prediction model is built based on a variety of neural networks after analyzing numerous M-A-E data,and then the M-A-E data can be predicted.The predicted results are highly correlated with the real data collected in the field.Through field verification,the deep learning-based prediction method of M-A-E data provides quantitative prediction data for rockburst monitoring.

关键词： Microseism Acoustic emission Electromagnetic radiation Neural networks Deep learning Rockburst

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Simultaneously enhancing coercivity and remanence of hot-deformed Nd-Fe-B magnets by flake copper powder assisted DyF3 interflake addition

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Journal of Rare Earths 2024年第7期42卷 1282-1288页

作者： Yikuan Hu jiajie Li Shengyu Sun Shuwei Zhong Munan Yang Xiaoqiang Yu Sajjad Ur Rehman Xi Yu Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices College of Rare EarthsJiangxi University of Science and Technology National Rare Earth Functional Materials Innovation Center Ganzhou Fortune Electronic Ltd.

It is still a challenge to simultaneously enhance coercivity(Hcj) and remanence（Jr） of hot-deformed NdFe-B magnet due to the coercivity-remanence trade-off dilemma.Here,we achieved this balance between Hcjand Jrby flake Cu powder assisted DyF3interflake addition.The Hcjincreases from 1218 to1496 kA/m and Jrincreases from 1.32 to 1.34 T compared with the original magnet.Results show that the width of coarse grain layers reduces because of the introduction of flake Cu,which increases the contact areas of the adjacent grains at ribbon interfaces and suppresses the excessive growth of grains.The stronger degree of texture and higher density compared with the original magnet should take the responsibility for the increase of Jr.Additionally,the aggregation regions of rare earth rich（RE-rich） phase reduce and the betterment of the microstructure is another reason for the enhancement of Jrin the flake Cu aided DyF3hot-deformed magnet.This strategy of using flake powder additives provides a promising method for optimizing microstructure and enhancing magnetic properties of hot-deformed Nd-Fe-B magnets.

关键词： Flake powder Hot-deformed magnet Interflake addition Nd-Fe-B Rare earths Remanence

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Fault Diagnosis Method of Rolling Bearing Based on ESGMD-CC and AFSA-ELM

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Structural Durability & Health Monitoring 2024年第1期18卷 37-54页

作者： jiajie He Fuzheng Liu Xiangyi Geng Xifeng Liang Faye Zhang Mingshun Jiang School of Traffic&Transportation Engineering Central South UniversityChangsha410075China Project Management Department CRRC Advanced Composites Co.Ltd.Qingdao266108China School of Control Science and Engineering Shandong UniversityJinan250061China

Incomplete fault signal characteristics and ease of noise contamination are issues with the current rolling bearing early fault diagnostic methods,making it challenging to ensure the fault diagnosis accuracy and reliability.A novel approach integrating enhanced Symplectic geometry mode decomposition with cosine difference limitation and calculus operator(ESGMD-CC)and artificial fish swarm algorithm(AFSA)optimized extreme learning machine(ELM)is proposed in this paper to enhance the extraction capability of fault features and thus improve the accuracy of fault diagnosis.Firstly,SGMD decomposes the raw vibration signal into multiple Symplectic geometry components(SGCs).Secondly,the iterations are reset by the cosine difference limitation to effectively separate the redundant components from the representative components.Additionally,the calculus operator is performed to strengthen weak fault features and make them easier to extract,and the singular value decomposition(SVD)weighted by power spectrum entropy(PSE)can be utilized as the sample feature representation.Finally,AFSA iteratively optimized ELM is adopted as the optimized classifier for fault identification.The superior performance of the proposed method has been validated by various experiments.

关键词： Symplectic geometry mode decomposition calculus operator cosine difference limitation fault diagnosis AFSAELM model

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Effects of the windshield inclination angle on head/brain injuries in car-to-pedestrian collisions using computational biomechanics models

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Transportation Safety and Environment 2024年第2期6卷 1-12页

作者： Fang Wang Mingliang Wang Lin Hu Ke Peng jiajie Yin Danqi Wang Liangliang Shi Zhou Zhou School of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114HunanChina Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and TechnologyChangsha 410114HunanChina State Key Laboratory of Vehicle NVH and Safety Technology China Automotive Engineering Research Institute Co.Ltd.Chongqing 401122China Division of Neuronic Engineering KTH Ro y al Institute of TechnologyStockholm 14152Sweden

Car-to-pedestrian collision(CPC)accidents occur frequently,and pedestrians often suffer serious head/brain injuries.One major cause is the primary impact with the windshield.Here,we use an umerical sim ulation method to study the influence of the windshield in-clination angle of a passenger car on pedestrian head/brain injury due to CPC accidents.The range of the windshield inclination angle was set at 24°-50°,with an interval of 2°.The results show that the windshield angle significantly affects the pedestrian kine-matics and exerts different effects on the head injury when evaluating with various head injury criteria.Regarding the head peak linear/rotational acceleration and acceleration-based head injury criterion(HIC)/rotational injury criterion(RIC),the predictions at the secondary impact stage have no clear relationship with the windshield angle(R^(2)=0.04,0.07,0.03 and 0.26,respectively)and their distributions are scattered.In the primary impact,the peak linear acceleration and HIC show a weak trend of first decreasing and then increasing with the increasing of the windshield angle,and the rotational acceleration and RIC tend to remain relatively con-stant.Regarding the cum ulative strain dama ge measure(CSDM)criterion,the predictions at the primary impact are slightly lower than those at the secondary impact,and the trend of first decreasing and then increasing with the increase in the windshield angle is observed at both impact stages.When the windshield inclination angle is approximately 32°-40°,the head injury severity in both impact phases is generally lower than that predicted at other windshield angles.

关键词： car-to-pedestrian collision(CPC) head/brain injury head injury criterion(HIC) windshield inclination angle computa-tional biomechanics model(CPCBM)

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