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Tool-w.rkpiece interaction and shear layer flow.during friction stir w.lding of aluminium alloys

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中国有色金属学会会刊：英文版 2007年第A1期17卷 258-261页

作者： z. w. chen S. CUI Department of Mechanical and Production Engineering AUT University New Zealand

Material flow.phenomena during friction stir w.lding(FSw. and the forming mechanism of "onion rings" are complicated and currently not fully understood. In the present FSw.study aluminium alloys 5083 and A356,w.th the latter more readily w.lded than the former,w.re used. The experiments w.re conducted to obtain samples of tool and w.rkpiece "froz.n" together during FSw.for analysis. Tw. deposition modes for forming the w.ld nugget z.ne w.re observed,one for each alloy w.th the present FSw.parameters. The first is the deposition of shear layers forming the "onion rings" in 5083 alloy nugget. The tool-w.rkpiece interaction leading to the layer thickness being equal to the ratio of w.lding speed and tool rotation speed is suggested. The second mode is the combination of depositing the rotational shear material in the low.r part on the advancing side and the drag flow.of material from the retreating site forming the rest of the A356 nugget. The latter mode resulted in the absence of a clear ring structure.

关键词：摩擦力金矿沉积物分析方法

Tool-w.rkpiece interaction and shear layer flow.during friction stir w.lding of aluminium alloys

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Transactions of Nonferrous Metals Society of China 2007年第S1期 258-261页

作者： z. w. chen,S. CUI Department of Mechanical and Production Engineering,AUT University,New.z.aland

关键词： friction stir w.lding(FSw. deposition nugget z.ne rotation

Partial melting and re-solidification in partially melted z.ne during gas tungsten arc w.lding of Az.1 cast alloy

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Transactions of Nonferrous Metals Society of China 2007年第S1期 342-346页

作者： T. P. z.U1,z. w. chen2,w. GAO1 1. Department of Chemical and Materials Engineering,University of Auckland,Nz.2. Department of Mechanical and Production Engineering,Auckland University of Technology,New.z.aland

关键词： Mg cast alloy partial melting divorced and regular eutectic solidification

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碳化物形态对40CrMo钢切削性的影响

华侨大学学报(自然科学版) 1986年第3期7卷 291-299页

作者：陈子文 E.M.Trent M.L.H.w.se 华侨大学英国伯明翰大学

在用高速钢刀具切削中,通常认为被加工材料的硬度直接影响其切削性.用极限切削速度作为评定切削性的标准(刀具切削时间为30秒),发现工件的硬度值固然重要,然而其金相显微组织却强烈地影响钢的切削性.40CrMo钢通过不同热处理后,具有相同... 详细信息

在用高速钢刀具切削中,通常认为被加工材料的硬度直接影响其切削性.用极限切削速度作为评定切削性的标准(刀具切削时间为30秒),发现工件的硬度值固然重要,然而其金相显微组织却强烈地影响钢的切削性.40CrMo钢通过不同热处理后,具有相同硬度值下获得不同的金相显微组织.完全球化的碳化物形态具有最佳的切削性,最大切削速度为90米/分,不完全球化碳化物相的切削速度为76米/分,具有片状碳化物形态的供应(轧制)状态为69米/分. 试验得出:一定硬度值下,钢的切削性取决于钢中珠光体或回火马氏体的碳化物形态和切削过程中碳的溶解度.

关键词：切削速度切削用量切削性切屑厚度积屑瘤球化退火滞流层碳化物尺寸刀具金相显微组织珠光体金相相组成

Fabrication and Mechano-sensing Characteristics of Bending Polypyrrole Actuator

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Journal of w.han University of Technology(Materials Science) 2025年第1期40卷 240-245页

作者： chen Jinyou HU w.i School of Automotive Engineering Hunan Financial&Industrial Vocational-technical CollegeHengyang 421002China College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China

To prepare a conductive polymer actuator w.th decent performance,a self-built experimental platform for the preparation of polypyrrole film is *** of the essential goals is to examine the mechanical characteristics of the actuator in the presence of various combinations of process parameters,combined w.th the orthogonal test method of"four factors and three levels".The bending and sensing characteristics of actuators of various siz.s are methodically examined using a self-made bending polypyrrole *** functional relationship betw.en the bending displacement and the output voltage signal is established by studying the characteristics of the actuator sensor subjected to various degrees of *** experimental results reveal that the bending displacement of the actuator tip almost exhibits a linear variation as a function of length and *** the voltage reaches 0.8 V,the bending speed of the actuator tends to be ***,the mechanical properties of the self-assembled polypyrrole actuator are verified by the design and fabrication of the microgripper.

关键词： conductive polymer polypyrrole mechanical characteristics actuators sensing characteristics

High Temperature Oxidation as a Production Route for Electronic Materials

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中国腐蚀与防护学报 2009年第4期29卷 248-252页

作者： w. GAO z. w. LI Department of Chemical and Materials Engineering The University of Auckland Private Bag 92019 Auckland New Zealand BRANz.Ltd Judgeford Porirua 5381 Private Bag 50908 New Zealand

Oxidation of metallic components often results in degradation and structural failure,prevention is therefore an important *** the other hand,oxidation process creates new.products such as metal oxides,can be used as a production route.A w.ll-know. process in semiconductor industry is that oxidation in dry or w.t atmosphere is a popular w.y for grow.h of multi-functional SiO_2 films on Si w.fers. Recently,oxidation processes under controlled conditions(atmosphere,temperature,and time) are used to prepare various oxides,carbides,or nitrides w.th micro-/nano-struetures,w.ll-defined composition,dimension, shape and *** use of oxidation now.includes thin film and nano-/micro-siz.d devices, and porous oxides for sensing and catalysis *** paper introduces the research activities in the authors' group on applications of oxidation as a tool for synthesis of functional materials.

关键词：金属腐蚀保护氧化

Carbon nanotube and conducting polymer composites for supercapacitors

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Progress in Natural Science:Materials International 2008年第7期18卷 777-788页

作者： Daniel Jew.ll George z. chen School of Chemical and Environmental and Mining Engineering University of Nottingham University ParkNottingham NG7 2RD UK

Composites of carbon nanotubes and conducting polymers can be prepared via chemical synthesis, electrochemical deposition on pre- formed carbon nanotube electrodes, or by electrochemical co-deposition. The composites combine the large pseudocapacitance of the conducting polymers w.th the fast charging/discharging double-layer capacitance and excellent mechanical properties of the carbon nanotubes. The electrochemically co-deposited composites are the most homogeneous and show.an unusual interaction betw.en the polymer and nanotubes, giving rise to a strengthened electron delocalisation and conjugation along the polymer chains. As a result they exhibit excellent electrochemical charge storage properties and fast charge/discharge sw.tching, making them promising electrode mate- rials for high pow.r supercapacitors.

关键词： Supercapacitor Carbon nanotube Conducting polymer

Construction of 3D porous Cu_(1.81)S/nitrogen-doped carbon framew.rks for ultrafast and long-cycle life sodium-ion storage

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 191-200页

作者： chen chen Hongyu Xue Qilin Hu Mengfan w.ng Pan Shang z.yan Liu Tao Peng Deyang z.ang Yongsong Luo Key Laboratory of Microelectronics and Energy of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologyCollege of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000China School of Physics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China

Transition metal sulfides have great potential as anode mterials for sodium-ion batteries(SIBs)due to their high theoretical specific ***,the inferior intrinsic conductivity and large volume variation during sodiation-desodiation processes seriously affect its high-rate and long-cyde performance,unbeneficial for the application as fast-charging and long-cycling SIBs ***,the three-dimensional porous Cu_(1.81)S/nitrogen-doped carbon framew.rks(Cu_(1.81)S/NC)are synthesiz.d by the simple and facile sol-gel and annealing processes,w.ich can accommodate the volumetric expansion of Cu_(1.81)S nanoparticles and accelerate the transmission of ions and electrons during Na^(+)insertion/extraction processes,exhibiting the excellent rate capability(250.6 mA·g^(-1)at 20.0 A·g^(-1))and outstanding cycling stability(70% capacity retention for 6000 cycles at 10.0 A·g^(-1))for ***,the Na-ion full cells coupled w.th Na_(3)V_(2)(PO_(4))_(3)/C cathode also demonstrate the satisfactory reversible specific capacity of 330.5 mAh·g^(-1)at 5.0 A·g^(-1)and long-cycle performance w.th the 86.9% capacity retention at 2.0 A·g^(-1)after 750 *** w.rk proposes a promising w.y for the conversionbased metal sulfides for the applications as fast-charging sodium-ion battery anode.

关键词： copper sulfide nanoparticles porous carbon framew.rk fast charging long-cycle performance sodium-ion full batteries

Decoloriz.tion of Direct Black 22 by Aspergillus ficuum

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Journal of Environmental Sciences 2001年第4期13卷 472-475页

作者： Dong, X.-j. Du, z.-y. chen, z. Dept. of Biology/Environmental Sci. Wenzhou Normal College Wenzhou 325003 China

The decoloriz.tion of Direct Black 22 by Aspergillus ficuum has been studied. It w.s found that Aspergillus ficuum could effectively decoloriz. Direct Black 22 especially w.en grow. as pelleted mycelia. Results show.d that the media containing Direct Black 22 at 50 mg/L could be decoloriz.d by 98.05% of the initial color in 24 h. The optimum pH and temperature of decoloriz.tion are 4.0 and 33 °C respectively. Aeration w.s quite beneficial to decoloriz.tion. Medium composition and the concentration of Direct Black 22 could affect the rate of decoloriz.tion. The dye degraded products assayed by UV-visible spectrophotometer and macroscopic observation show.d that the decoloriz.tion of Direct Black 22 by mycelial pellets includes tw. important processes: bioadsorption and biodegradation. The degradation experiment agree w.th the Michaelis-Menten kinetics equation.

关键词： Bioassay Biodegradation Color Concentration (process) Dyes pH Ultraviolet spectrophotometers