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Tribological properties of polyimide composites reinforced with fibers rubbing against Al_(2)O_(3)

Friction 2021年第2期9卷 301-314页

作者： huimin qi Ga ZHANG Zhiqin ZHENG Jiaxin YU Chao HU Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education State Key Laboratory of Environment-friendly Energy MaterialsSouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China qingdao Center of Resource Chemistry&New Materials Qingdao 266071China Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory Southwest University of Science and TechnologyMianyang 621010China

Reinforcing fillers are of great importance in tribological performance and tribofilm formation of polymeric *** this study,the tribological properties of aramid particle(AP)and short carbon fiber(SCF)reinforced polyimide(PI)composites were added to hexagonal boron nitride(h-BN),and silica(SiO_(2))nanoparticles sliding against alumina were comprehensively *** sliding occurred with AP-reinforced PI composites,the tribological properties were not closely depended on the pressure×velocity(p×v)factors and the *** interactions between AP and its counterpart could not induce tribo-sintering of the transferred wear *** such,the tribofilm seemed to be in a viscous state,leading to higher friction and ***,the inclusion of hard SCF into the PI matrix changed the interfacial interactions with alumina.A robust tribofilm consisting of a high fraction of silica was generated when the SCF-reinforced PI was added to the SiO_(2) *** exhibited a high load-carrying capability and was easily *** caused a significant decrease in the friction and wear of the PI composite at 8 MPa·1m/***,due to their high melting point,few h-BN nanoparticles were observed in the tribofilm of the SCF-reinforced PI when hexagonal boron nitride was added.

关键词： reinforcing filler polyimide composite tribofilm Al_(2)O_(3)

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Tribological Behaviors of Electroless Nickel-Boron Coating on Titanium Alloy Surface

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 309-320页

作者： Yao Jia Jianping Lai Jiaxin Yu huimin qi Yafeng Zhang Hongtu He Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education State Key Laboratory of Environment-Friendly Energy MaterialsSouthwest University of Science and TechnologyMianyang 621010China

Titanium alloys are excellent structural materials in engineering fields,but their poor tribological properties limit their further *** plating is an effective method to enhance the tribological performance of alloys,but it is difficult to efficiently apply to titanium alloys,due to titanium alloy’s strong chemical *** this work,the electroless Nickel-Boron(Ni-B)coating was successfully deposited on the surface of titanium alloy(Ti-6AL-4V)via a new pre-treatment ***,linearly reciprocating sliding wear tests were performed to evaluate the tribological behaviors of titanium alloy and its electroless Ni-B *** was found that the Ni-B coatings can decrease the wear rate of the titanium alloy from 19.89×10^(−3)mm^(3)to 0.41×10^(−3)mm^(3),which attributes to the much higher hardness of Ni-B *** heat treatment,the hardness of Ni-B coating further increases corresponding to coating crystallization and hard phase ***,heat treatment does not improve the tribological performance of Ni-B coating,due to the fact that higher brittleness and more severe oxidative wear exacerbate the damage of heat-treated ***,the Ni-B coatings heat-treated both in air and nitrogen almost present the same tribological *** finding of this work on electroless coating would further extend the practical applications of titanium alloys in the engineering fields.

关键词： Electroless coating Titanium alloy Tribology Wear Heat treatment Nanoindentation

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Quantitative analysis of the tribological properties of phosphate glass at the nano- and macro-scales

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Friction 2021年第5期9卷 1138-1149页

作者： huimin qi Wen HU Hongtu HE Yafeng ZHANG Chenfei SONG Jiaxin YU Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education State Key Laboratory of Environment-friendly Energy MaterialsSouthwest University of Science and TechnologyMianyang 621010China National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and TechnologyLuoyang 471023China

Processing(grinding,polishing)of phosphate laser(PL)glass involves material removal at two vastly different(spatial)*** this study,the nano‐and macro‐tribological properties of PL glass are investigated by rubbing the glass against a SiO_(2) counter‐surface in both dry and humid *** results indicate that the friction of the PL glass/SiO_(2) pair has opposing trends at the nano‐and *** the nanoscale,the friction coefficient(COF)in humid air is much higher than in dry air,which is attributed to the capillary effect of the absorbed water‐film at the *** the macroscale,on the other hand,the COF in humid air is lower than in dry air,because the water‐related mechanochemical wear makes the worn surface less susceptible to *** removal for PL glass is better facilitated by humid air than by dry air at both scales,because the stress‐enhanced hydrolysis accelerates the material‐removal process in ***,the material‐removal is more sensitive to contact pressure at the macroscale,because stronger mechanical‐interaction occurs during material removal at the macroscale with the multi asperity contact *** the macroscale,the material removal is more sensitive to contact pressure in humid air compared to dry *** almost all mechanical energy is used to remove material in humid air,and most of the mechanical energy is used to produce cracks in PL glass in dry *** results of this study can help optimize the multi‐scale surface processing of optical glasses.

关键词： phosphate glass friction wear water hydrolysis tribochemistry

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High-Performance Aqueous Zinc-Ion Battery Based on Laser-Induced Graphene

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Nanomanufacturing and Metrology 2023年第2期6卷 55-65页

作者： Chengjuan Yang Yuchun Tong Zhen Yang Hui Xiao huimin qi Faze Chen School of Mechanical Engineering Tianjin UniversityTianjin 300354China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin 300072China

Zn-ion batteries(ZIBs)have a broad application prospect because of their advantages of high power,large capacity,and high energy ***,the development of high-capacity,long-lifespan ZIBs is challenging because of the faster dendrite growth and the occurrence of the hydrogen evolution ***-induced graphene(LIG)is a material with many defects and *** of these characteristics,it plays an important role in improving nucleation.A simple and effective method for preparing LIG was proposed in this paper,and the LIG was covered on the surface of Zn foil to form a composite *** structure substantially reduces the nucleation overpotential of Zn and slows down the dendrite growth of Zn by improving the nucleation behavior of Zn^(2+).Simultaneously,the three-dimensional porous structure increases the specific surface area of the electrode,so the battery has a larger specific *** with the bare Zn electrode,the composite electrode possesses lower overpotential and longer cycle *** addition,the full battery using activated carbon as the active material exhibits great rate and cycle *** facile and scalable approach may solve the problem of Zn dendrite growth,which is crucial for the large-scale application of ZIBs.

关键词： Laser-induced graphene Zinc-ion batteries Dendrite Femtosecond laser

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异位类Fenton化学氧化在多环芳烃污染场地修复中的应用

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环境工程学报 2018年第11期12卷 3260-3268页

作者：戚惠民上海市地矿工程勘察院上海200072

多环芳烃作为土壤的主要污染源之一,其修复技术的研究对土壤可持续利用具有重要的意义;但目前的研究主要基于室内小试实验,对具体修复技术在实际现场中的应用少有报道。基于上海青浦区西虹桥沈海高速东侧17-02污染场地的工程实践,结合... 详细信息

多环芳烃作为土壤的主要污染源之一,其修复技术的研究对土壤可持续利用具有重要的意义;但目前的研究主要基于室内小试实验,对具体修复技术在实际现场中的应用少有报道。基于上海青浦区西虹桥沈海高速东侧17-02污染场地的工程实践,结合室内实验,详细地介绍了原场异位类Fenton化学氧化修复多环芳烃污染土壤施工工艺。处理结果表明:以柠檬酸为催化助剂的类Fenton化学氧化能够有效地处理场地污染土壤中的苯并(a)蒽、苯并(a)芘、苯并(b)荧蒽和茚并(1, 2, 3-cd)芘等超标污染物;修复后场地土壤各项物理指标相比修复前变化较小;同时,类Fenton氧化反应放热,修复过程中土壤微生物能够将有机柠檬酸快速降解,有效降低了化学氧化对土壤p H的影响。

关键词：多环芳烃(PAHs) 土壤修复类Fenton试剂柠檬酸

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Laser machining fundamentals:micro,nano,atomic and close-to-atomic scales

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International Journal of Extreme Manufacturing 2023年第1期5卷 125-151页

作者： Jinshi Wang Fengzhou Fang Haojie An Shan Wu huimin qi Yuexuan Cai Guanyu Guo State Key Laboratory of Precision Measuring Technology&Instruments Laboratory of Micro/Nano Manufacturing Technology(MNMT)Tianjin UniversityTianjin 300072People’s Republic of China Centre of Micro/Nano Manufacturing Technology(MNMT-Dublin) University College DublinDublin4Ireland

With the rapid development in advanced industries,such as microelectronics and optics sectors,the functional feature size of devises/components has been decreasing from micro to nanometric,and even ACS for higher performance,smaller volume and lower energy *** this time,a great many quantum structures are proposed,with not only an extreme scale of several or even single atom,but also a nearly ideal lattice structure with no material *** is almost no doubt that such structures play critical role in the next generation products,which shows an urgent demand for the *** machining is one of the most important approaches widely used in engineering and scientific *** is high-efficient and applicable for most kinds of ***,the processing scale covers a huge range from millimeters to nanometers,and has already touched the atomic ***–material interaction mechanism,as the foundation of laser machining,determines the machining accuracy and surface *** becomes much more sophisticated and dominant with a decrease in processing scale,which is systematically reviewed in this *** general,the mechanisms of laser-induced material removal are classified into ablation,CE and atomic desorption,with a decrease in the scale from above microns to *** effects of processing parameters on both fundamental material response and machined surface quality are discussed,as well as theoretical methods to simulate and understand the underlying *** at nanometric to atomic scale are provided,which demonstrate the capability of laser machining in achieving the ultimate precision and becoming a promising approach to ACSM.

关键词： laser machining mechanism atomic and close-to-atomic scale manufacturing ACSM manufacturing III

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杂居区少数民族民歌分类新构想——以青海互助土族民歌为例

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音乐研究 2010年第5期 58-66页

作者：祁慧民青岛大学音乐学院

对于民歌的分类古已有之。早在《诗经》中就对民歌有了“十五国风”的分类，在《乐府诗集》中令人惊奇地使用了“郊庙歌辞、燕射歌辞、鼓吹歌辞、横吹曲辞、相和歌辞、清商歌辞、舞曲歌辞、琴曲歌辞、杂曲歌辞、近代曲辞、杂歌谣辞、新... 详细信息

对于民歌的分类古已有之。早在《诗经》中就对民歌有了“十五国风”的分类，在《乐府诗集》中令人惊奇地使用了“郊庙歌辞、燕射歌辞、鼓吹歌辞、横吹曲辞、相和歌辞、清商歌辞、舞曲歌辞、琴曲歌辞、杂曲歌辞、近代曲辞、杂歌谣辞、新乐府辞”等12类分法。

关键词：土族民歌分类少数民族郊庙歌辞青海杂居《乐府诗集》《诗经》

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土族民歌的传承与传播

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人民音乐（评论） 2006年第3期 56-58页

作者：祁慧民青岛大学音乐学院

主要分布在青海、甘肃两省的土族是我国多民族大家庭中的一员。总计24万多的土族人（2000年第五次全国人口普查统计数字），绝大部分生活在青海境内。青海省互助土族自治县又是土族最大的积聚区。土族人除使用本民族的土族语外还广泛使... 详细信息

主要分布在青海、甘肃两省的土族是我国多民族大家庭中的一员。总计24万多的土族人（2000年第五次全国人口普查统计数字），绝大部分生活在青海境内。青海省互助土族自治县又是土族最大的积聚区。土族人除使用本民族的土族语外还广泛使用汉语。如今土族人的生产已由祖辈的半农半牧变成了以农为主、兼有少量畜牧业的生产方式。在长期的生产和生活实践中，勤劳、善良、纯朴的土族人民创造出了具有浓郁地方色彩的、独特的民族音乐文化，本文将对青海互助土族民歌的传承与传播略作探讨。

关键词：土族人传播传承民歌互助土族自治县第五次全国人口普查民族音乐文化生活实践青海省统计数字

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Thermal Polymerization of Cyanate Ester-Benzoxazine:Study of a Functional Model Compound

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上海航天（中英文） 2022年第1期39卷 122-128,161页

作者： WANG Fan ZHOU Hui WAN Li DONG Bin LI Shengchao qi huimin Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Composites Science&Technology Co. Ltd.Shanghai 201112China

A novel benzoxazine(BOZ)monomer is synthesized by a pot method with solvent-free to blend with cyanate ester(CE).A soluble intermediate is obtained after being cured for 20 h at 80℃.The two model compound and the blends are analyzed with the infrared radiation(IR),nuclear magnetic resonance(NMR)spectroscopy,and differential scanning calorimetry(DSC).The results show that an intermediate of the iminocarbonate and BOZ structures is formed by the ring-open BOZ reacting with the cyanate groups and ring-unopened ***,rearrangement and ring-opening occur in the postcure of the intermediate to form the alkyl isocyanurate structure with polybenzoxazine.

关键词： thermosetting resin benzoxazine(BOZ) cyanate ester(CE)resin polymerization mechanism

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等离子体改性聚酯织物的表面分析

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纺织学报 1989年第9期10卷 20-23页

作者：齐会民裴晋昌上海市纺织科学研究院

本文用含有对X光电子能谱敏感的元素的试剂作为衍生剂,对经等离子处理的聚酯织物的表面官能团进行衍生,然后用X米电子能谱仪进行测试,定量分析等离子体处理的聚酯织物的表面官能团羟基、羧基、环氧基、羰基、过氧化氢基的含量。同时,用... 详细信息

本文用含有对X光电子能谱敏感的元素的试剂作为衍生剂,对经等离子处理的聚酯织物的表面官能团进行衍生,然后用X米电子能谱仪进行测试,定量分析等离子体处理的聚酯织物的表面官能团羟基、羧基、环氧基、羰基、过氧化氢基的含量。同时,用X射线衍射的方法分析了各种放电参数对聚酯织物结晶度的影响。

关键词：等离子体改性处理聚酯织物

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