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Insight into the high-temperature tribological mechanism of VAlTiCrW high entropy alloy film:AlV_(3)O_(9)from tribochemistry

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Friction 2023年第7期11卷 1165-1176页

作者： Xuesong LIU Jun FAN jibin pu Zhaoxia LU College of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Key Laboratory of Marine Materials and Related Technologies Key Laboratory of Marine Materials and Protective Technologies of Zhejiang ProvinceNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

High-entropy alloys have made significant progress in high mechanical properties,wear resistance,and corrosion resistance *** tribological properties,especially high-temperature lubrication,have become another sought *** this work,VAlTiCrW high-entropy alloy film with body-centered cubic(BCC)structure was prepared on superalloy substrate by magnetron *** is found that the VAlTiCrW film shows very low friction coefficient of 0.15 and a low wear rate of 10^(-5) orders of magnitude at 800℃.After 800℃oxidation,the film can still obtain a friction coefficient of no more than 0.2 at 700℃.XRD and TEM revealed the formation of ternary oxide AlV_(3)O_(9)with preferred orientation of(002)crystal plane with large spacing of 0.71 nm on the wear surface of the film,a high-temperature lubricating phase that has not been reported,realizes the low friction *** AlV_(3)O_(9)can be formed by tribochemical reaction under the thermal-mechanical action at 700℃,but pre-oxidation at 800℃is the prerequisite in order to form the precursors of V-rich and Al-rich oxide layer.

关键词： high entropy alloy high temperature friction AlV_(3)O_(9) oxide

Anomalous enhancement oxidation of few-layer MoS_(2)and MoS_(2)/h-BN heterostructure

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Nano Research 2022年第8期15卷 7081-7090页

作者： Siming Ren Yanbin Shi Chaozhi Zhang Mingjun Cui jibin pu Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key Laboratory of Impact and Safety Engineering Ministry of Education of ChinaSchool of Mechanical Engineering and MechanicsNingbo UniversityNingbo 315211China

Because of profound applications of two-dimensional molybdenum disulfide(MoS_(2))and its heterostructures in electronics,its thermal stability has been spurred substantial *** employ a precision muffle furnace at a series of increasing temperatures up to 340℃to study the oxidation behavior of continuous MoS_(2)films by either directly growing mono-and fewlayer MoS_(2)on SiO_(2)/Si substrate,or by mechanically transferring monolayer MoS_(2)or hexagonal boron nitride(h-BN)onto monolayer MoS_(2)*** show that monolayer MoS_(2)can withstand high temperature at 340℃with less oxidation while the few-layer MoS_(2)films are completely oxidized just at 280℃,resulting from the growth-induced tensile strain in few-layer MoS_(2).When the tensile strain of films is released by transfer method,the stacked few-layer MoS_(2)films exhibit superior thermal stability and typical layer-by-layer oxidation behavior at similarly high ***,for the MoS_(2)/h-BN heterostructure,the h-BN film itself stacked on top is not damaged and forms many bubbles at 340℃,whereas the underlying monolayer MoS_(2)film is oxidized *** comprehensively using various experimental characterization and molecular dynamics calculations,such anomalous oxidation behavior of MoS_(2)/h-BN heterostructure is mainly due to the increased tensile strain in MoS_(2)film at elevated temperature.

关键词： molybdenum disulfide hexagonal boron nitride heterostructure enhancement oxidation tensile strain

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微纳尺度固体超滑研究进展

摩擦学学报（中英文） 2024年第4期44卷 437-459页

作者：孙军辉张鑫张金璐葛蒲宇程子文蒲吉斌鲁志斌钱林茂西南交通大学机械工程学院牵引动力国家重点实验室四川成都610031 中国科学院兰州化学物理研究所固体润滑国家重点实验室甘肃兰州730000 中国科学院宁波材料技术与工程研究所中科院海洋新材料与应用技术重点实验室浙江宁波315201

超润滑,指摩擦阻力极低的状态,是润滑技术发展追求的终极目标.超滑能够大幅度减小甚至消除滑动界面的摩擦磨损、抑制摩擦能量耗散,有效延长运动部件的可靠性和服役寿命,具有重要的基础研究和工程应用价值.鉴于微纳尺度固体超滑是实现宏... 详细信息

超润滑,指摩擦阻力极低的状态,是润滑技术发展追求的终极目标.超滑能够大幅度减小甚至消除滑动界面的摩擦磨损、抑制摩擦能量耗散,有效延长运动部件的可靠性和服役寿命,具有重要的基础研究和工程应用价值.鉴于微纳尺度固体超滑是实现宏观工程超滑的基础,是可能解决现代制造业超精密、微型化发展面临严重摩擦磨损瓶颈问题的有效途径,因此有必要对学术界目前实现微纳尺度固体超滑的原理和典型方法进行探讨,深化认识固体超滑的实现策略,提高摩擦学研究服务现代文明的支撑能力.从早期的生活生产经验总结,到近代的机械啮合理论、黏着学说乃至当代原子分子水平摩擦理论,人们对摩擦和润滑的认识不断提高,但都不曾回避“摩擦总是伴随着动能/机械能消耗”的观点,即摩擦是界面滑动发生能量耗散的力学体现,滑动势垒的存在是滑动产生摩擦阻力的本征原因.因此,本文中将围绕如何降低滑动势垒、减小摩擦耗散的思辨理念,介绍当前固体超滑研究的发展和现状,着重探讨实现微纳尺度超滑的一般策略,简要综述学术界目前典型固体超润滑的原理和方法等.首先,介绍了结构超滑的提出、发展及其应用;其次,探讨了连续滑动超低摩擦行为的基础原理及应用等;此外,阐述了近年来提出的压力诱导超滑的理念,着重从现象发现、基本原理、试验观测方法及其可能的基础和应用价值等方面,介绍了压力诱导超滑的研究进展.最后,从基础研究和应用技术开发方面提出了超滑研究可能需要加强的几方面内容.以期通过当前综述,丰富学术界对超润滑的基本问题、科学意义及其应用价值的认识,阐明固体超滑的微观机理、实现策略,指出固体超滑面临的挑战及发展方向,助力固体超润滑从基础研究向工程应用迈进.

关键词：超润滑超低摩擦结构超滑连续滑动压力诱导超滑

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宽温域低摩擦涂层研究现状

中国表面工程 2022年第3期35卷 1-15页

作者：宋福磊蒲吉斌中国科学院宁波材料技术与工程研究所宁波315200

减摩耐磨涂层是高端装备中传动机构可靠运行的关键材料。在温度变化较大的工况条件下如何降低运动副的摩擦磨损,一直制约着高端装备技术的发展,探究宽温域低摩擦涂层对高速发展的现代工业技术具有迫切需求。简述目前宽温域低摩擦涂层的... 详细信息

减摩耐磨涂层是高端装备中传动机构可靠运行的关键材料。在温度变化较大的工况条件下如何降低运动副的摩擦磨损,一直制约着高端装备技术的发展,探究宽温域低摩擦涂层对高速发展的现代工业技术具有迫切需求。简述目前宽温域低摩擦涂层的研究现状,归纳和评述金属复合基涂层、氧化物基涂层和氮化物基涂层等三类宽温域低摩擦涂层的组成、结构、摩擦学性能以及减摩机理等,得到单一结构的固体润滑涂层很难实现发展的需求。提出制备多层涂层、预处理(织构化、预氧化等)等技术路线去实现运动副良好的摩擦学性能,解决常规固体润滑涂层温度敏感性问题,为宽温域低摩擦涂层的相关研究发展提供新思路。

关键词：宽温域低摩擦涂层金属复合氮化物氧化物

MoS_(2)/WS_(2)复合薄膜的环境适应性和摩擦学性能

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中国机械工程 2022年第12期33卷 1468-1476页

作者：范昕任思明王海新蒲吉斌中国科学院宁波材料技术与工程研究所浙江省海洋材料与防护技术重点实验室中国科学院海洋新材料与应用技术重点实验室宁波315201 中国科学院大学北京100049

湿热大气环境对MoS_(2)润滑薄膜的摩擦学性能有严重的劣化作用。采用非平衡磁控溅射技术成功制备了WS_(2)掺杂MoS_(2)复合薄膜,研究发现,MoS_(2)基体中掺入少量WS_(2)可以诱导MoS_(2)沿(002)晶面择优生长,薄膜结构变得更加致密,显著抑... 详细信息

湿热大气环境对MoS_(2)润滑薄膜的摩擦学性能有严重的劣化作用。采用非平衡磁控溅射技术成功制备了WS_(2)掺杂MoS_(2)复合薄膜,研究发现,MoS_(2)基体中掺入少量WS_(2)可以诱导MoS_(2)沿(002)晶面择优生长,薄膜结构变得更加致密,显著抑制腐蚀介质的渗透和扩散,使MoS_(2)/WS_(2)复合薄膜展现出高盐雾耐蚀性、小摩擦因数和低磨损率。成分优化的MoS_(2)-1.6%WS_(2)(原子分数)复合薄膜在经历4天的盐雾试验后仅表层被氧化,仍能保持0.16的小摩擦因数和3.80×10^(-6) mm^(3)/(N·m)的低磨损率。

关键词： MoS_(2)/WS_(2)复合薄膜盐雾环境耐腐蚀性摩擦学性能

Bi-Frobenius Algebra Structures on Quantum Complete Intersections

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Acta Mathematica Sinica,English Series 2024年第6期40卷 1481-1504页

作者： Hai JIN pu ZHANG School of Mathematical Sciences Shanghai Jiao Tong UniversityShanghai 200240P.R.China

This paper is to look for bi-Frobenius algebra structures on quantum complete intersections over field *** find a class of comultiplications,such that if√−1∈k,then a quantum complete intersection becomes a bi-Frobenius algebra with comultiplication of this form if and only if all the parameters qij=±***,it is proved that if√−1∈k then a quantum exterior algebra in two variables admits a bi-Frobenius algebra structure if and only if the parameter q=±√*** if−1/∈k,then the exterior algebra with two variables admits no bi-Frobenius algebra *** prove that the quantum complete intersections admit a bialgebra structure if and only if it admits a Hopf algebra structure,if and only if it is commutative,the characteristic of k is a prime p,and every ai a power of *** also provides a large class of examples of bi-Frobenius algebras which are not bialgebras(and hence not Hopf algebras).In commutative case,other two comultiplications on complete intersection rings are given,such that they admit non-isomorphic bi-Frobenius algebra structures.

关键词： Bi-Frobenius algebras coalgebras bialgebras Hopf algebras quantum complete intersections quantum exterior algebras

Divalent anion intercalation and etching-hydrolysis strategies to construct ultra-stable electrodes for seawater splitting

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Science China Chemistry 2024年第2期67卷 687-695页

作者： Jiajia Lu Yang Liu Han-pu Liang Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao266101China Henan Provincial Key Laboratory of Nanocomposites and Applications Institute of Nano-Structured Functional MaterialsHuanghe Science and Technology CollegeZhengzhou450006China School of Materials Science and Engineering Henan Normal UniversityXinxiang453007China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Shandong Energy Institute Qingdao266101China

Developing stable electrodes for seawater splitting remains a great challenge due to the detachment of catalysts at a large operating current and severe anode corrosion caused by ***,divalent anion intercalation and etching-hydrolysis strategies are deployed to synthesize the ultra-stable anode,dendritic Fe(OH)_(3) grown on Ni(SO_4)_(0.3)(OH)_(1.4)–Ni(OH)_(2).Experimental results reveal that the anode exhibits good activity and excellent stability in alkaline simulated *** 500 h,the current density operated at 1.72 V remains 99.5%,about 210 m A cm^(-2).The outstanding stability originates from the etchinghydrolysis strategy,which strengthens the interaction between the catalyst and the carrier and retards thus the detachment of catalysts at a large current ***,theoretical simulations confirm that the intercalated divalent anions,such as SO_4^(2-) and CO_(3)^(2-),can weaken the adsorption strength of chlorine on the surface of catalysts and hinder the coupling and hybridization between chlorine and nickel,which slows down the anode corrosion and improves catalytic ***,the twoelectrode system shows the remarkable 95.1% energy efficiency at 2,000 A m-2and outstanding stability in 6 mol L^(-1) KOH +seawater at 80 ℃.

关键词： seawater splitting stability divalent anion intercalation etching-hydrolysis

苛刻空间环境下固体润滑涂层在谐波齿轮减速器表面的服役性能评价

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中国表面工程 2023年第5期36卷 76-87页

作者：孙繁新史彦斌蒲吉斌穆晓彪孙伟北京空间飞行器总体设计部北京100094 中国科学院宁波材料技术与工程研究所宁波315201 北京中技克美谐波传动股份有限公司北京101300 国防科工局军工项目审核中心北京100039

随着航天技术和深空探测的发展,传统的脂润滑材料已难以满足谐波减速器在真空宽温区的润滑需求,固体润滑涂层是一种非常理想的空间润滑方式,具有较宽的温度使用范围,且润滑性能受工况的影响也较小,广泛应用于空间运动机构。目前固体润... 详细信息

随着航天技术和深空探测的发展,传统的脂润滑材料已难以满足谐波减速器在真空宽温区的润滑需求,固体润滑涂层是一种非常理想的空间润滑方式,具有较宽的温度使用范围,且润滑性能受工况的影响也较小,广泛应用于空间运动机构。目前固体润滑谐波减速器在苛刻空间环境下的使役性能(传动精度和传动效率)还鲜有报道,通过物理气相沉积技术分别在XBS-40-100型和XBS-60-120型谐波减速器制备MOSTP&MOSTP和DLC&MOSTP两种固体润滑涂层,并对润滑前后的谐波齿轮减速器的传动精度、传动效率及真空高、低温适应性进行对比研究。研究结果表明:谐波减速器的传动误差不仅没受到润滑涂层的影响,其传动精度还远优于脂润滑的同型号谐波减速器;固体润滑谐波减速器具有优异的温度适应性,XBS-40-100型和XBS-60-120型谐波减速器在-90℃~100℃温度范围内,传动效率分别为69.4%~82.8%和66.2%~86.7%,远高于全氟聚醚(-90℃,效率在30%左右)和多烷基化环戊烷(-90℃,效率基本在15%左右)润滑的同型号谐波减速。系统研究了固体润滑谐波减速器的使役性能和温度适应性,可为空间谐波减速器润滑材料的选取提供试验依据。

关键词：谐波减速器 MoS_(2)基固体润滑涂层 DLC固体润滑涂层温度适应性传动效率

Image-Based Flow Prediction of Vocal Folds Using 3D Convolutional Neural Networks

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Journal of Bionic Engineering 2024年第2期21卷 991-1002页

作者： Yang Zhang Tianmei pu Jiasen Xu Chunhua Zhou College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing210016China College of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou225127China College of Aeronautics Nanjing University of Aeronautics and AstronauticsNanjing210016China

In this work,a three dimensional(3D)convolutional neural network(CNN)model based on image slices of various normal and pathological vocal folds is proposed for accurate and efficient prediction of glottal *** 3D CNN model is composed of the feature extraction block and regression *** feature extraction block is capable of learning low dimensional features from the high dimensional image data of the glottal shape,and the regression block is employed to flatten the output from the feature extraction block and obtain the desired glottal flow *** input image data is the condensed set of 2D image slices captured in the axial plane of the 3D vocal folds,where these glottal shapes are synthesized based on the equations of normal vibration *** output flow data is the corresponding flow rate,averaged glottal pressure and nodal pressure distributions over the glottal *** 3D CNN model is built to establish the mapping between the input image data and output flow *** ground-truth flow variables of each glottal shape in the training and test datasets are obtained by a high-fidelity sharp-interface immersed-boundary *** proposed model is trained to predict the concerned flow variables for glottal shapes in the test *** present 3D CNN model is more efficient than traditional Computational Fluid Dynamics(CFD)models while the accuracy can still be retained,and more powerful than previous data-driven prediction models because more details of the glottal flow can be *** prediction performance of the trained 3D CNN model in accuracy and efficiency indicates that this model could be promising for future clinical applications.

关键词： Vocal folds Computational fluid dynamics Machine learning 3D convolutional neural network