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Microstructure of Fe-Based Alloy Hardfacing Coating Reinforced by TiC-VC Particles

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Journal of Iron and Steel Research International 2006年第4期13卷 51-55页

作者： WANG Xin-hong zou zeng-da QU Shi-yao School of Materials Science and Engineering Shandong University Jinan 250061 Shandong China

Mierostrueture of the Fe-based alloy hardfaeing coating reinforced by TiC-VC particles was investigated by means of SEM, TEM, XRD and EPMA. The thermodynamics and effect of elements on the carbides were discussed. The result shows that TiC-VC carbides can be formed during arc welding. Carbides with particle size of 2 ～4μm are uniformly dispersed in the matrix. Evidently the covering components and their amount affect the microstrueture and hardness of the coatings. An excellent microstructure and hardness of hardfacing coating were obtained, while the amount of graphite, FeTi and FeV was controlled within the range of 8%- 10%, 15%- 18% and 8%- 12%, respectively.

关键词： TiC-VC particle arc welding Fe-based hardfacing coating microstructure

Effects of activating flux on CO_2 laser welding process of 6013 Al alloy

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Transactions of Nonferrous Metals Society of China 2012年第1期22卷 23-29页

作者： QIN Guo-liang WANG Guo-gang zou zeng-da State Key Laboratory ofAdvanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Technology Shandong UniversityJi’nan 250061China

In order to increase the absorption of laser energy and improve the weld appearance in laser welding of Al alloy, 1.8 mm- 6013 Al alloy plate was welded by activating flux CO2 laser welding. Activating flux includes oxide and fluoride, which was coated on the workpiece surface before welding. The experimental results show that the activating flux can effectively improve the absorption of CO2 laser energy and increase the amount of the molten base metal. The improvement on the absorption of laser energy by oxide activating flux is greater than that by fluoride activating flux or two-component activating flux, but the slag detachability made from both the single activating flux and two-activating flux is poor. The gas pore sensitivity with oxide activating flux is much higher than that with fluoride activating flux in CO2 laser welding of 6013 Al alloy.

关键词： laser welding aluminum alloy activating flux weld appearance gas pore

Features of the Real Structure of Lanthanum Hexaboride Polycrystalline

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Chinese Physics Letters 2001年第7期18卷 942-943页

作者： ZHENG Shu-Qi MIN Guang-Hui zou zeng-da YU Pu-Lian HAN Jian-De Y.B.Paderno College of Materials Science and Engineering Shandong UniversityJi’nan 250061 Institute for Problems of Materials Science National Academy of Sciences of UkraineKiev 03142Ukraine

The Microstructure of lanthanum hexaboride(LaB6)polycrystalline has been studied by using transmission electron *** shows that the ideal LaB6 polycrystalline can be obtained by sintering ingots at the temperature of 2273 K for holding time of 120 min in Ar pressure of 800 Torr,where the ingots are formed by pressing LaB6 powder at room temperature at a pressure of 0.4-0.5 *** particles in LaB6 polycrystalline hardly bind;there are only a few of pores at the joint parts of three particles and a few of impurities exist in some *** sintering process for fabricating LaB6 polycrystalline is analysed and the formation of the pore and the impurities are studied from the point of surface tension.

关键词： LaB6 polycrystalline lanthanum

Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures

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Nano Research 2024年第8期17卷 7768-7775页

作者： Yunlong Bai Shuai Zhang Nengneng Luo Bingsuo zou Ruosheng zeng State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

Zero-dimensional metal halides are of unique structures and tunable photoluminescence properties,showing great potential applications such as light-emitting diodes(LEDs)and ***,we successfully synthesized Cu^(+)doped(MA)_(2)ZnCl_(4)metal halides by a slow evaporation solvent *** introduction of Cu^(+)results in sky-blue self-trapped exciton emission in(MA)_(2)ZnCl_(4) at 486 nm at room temperature,and a photoluminescence quantum yield is as high as 54.9%.Interestingly,at low temperatures,Cu^(+)-doped(MA)_(2)ZnCl_(4) exhibits two emission peaks located at 482 and 605 nm,*** temperaturedependent dual emission indicates two excited state structures that exist on the triplet excited-state potential energy *** addition,the temperature sensor we fitted has good performance(Sr=1.65%·K^(−1)),which is the first attempt in Cu^(+) doped Znbased metal *** work enriches the family of sky-blue metal halides and provides a promising strategy for building skyblue LEDs.

关键词： sky-blue emission self-trapped exciton metal halides excited state structures temperature sensor

Fabrication of surface passivated two-dimensional MFI zeolite for alkylation between toluene with methanol

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Frontiers of Chemical Science and Engineering 2024年第4期18卷 115-124页

作者： Zhenyuan zou Shengzhi Gan Ting Pu Xingxing zeng Yi Huang Baoyu Liu School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China School of Engineering Institute for Materials&Processesthe University of EdinburghEdinburgh EH93FBUnited Kingdom

The fabrication of suitable MFI zeolites to effectively produce para-xylene through the alkylation between toluene and methanol is highly ***,the two-dimensional pillared MFI zeolite was modified by silicalite-1,and its morphology and structure were systematically investigated by tuning the concentration of Si species during the secondary crystallization *** MFI zeolites were characterized by X-ray diffraction,transmission electron microscopy,pyridine-infrared and N_(2) adsorption-desorption *** characterization results showed that the external Brønsted acid sites of surface passivated P-MFI-x samples have been successfully ***,the P-MFI-23 showed long lifetime and high selectivity of para-xylene(about 35%)based on the cooperation between opened interlamellar structure and passivated silicalite-1 *** was found that the accumulated hard coke in the interior of MFI zeolites not only blocked the channels of zeolites but also covered the acidic sites,resulting in the deactivation of ***,the highest selectivity of para-xylene(about 48%)can be achieved for P-MFI-30 under harsh reaction condition,which also exhibited excellent regeneration property in the alkylation reaction between toluene and *** strategy described in present research may open a window for the design of other advanced materials.

关键词： alkylation MFI nanosheets catalysis

Advances in functional coatings on biliary stents

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Regenerative Biomaterials 2024年第2期3卷 55-75页

作者： Kaining Yang Wenxin Sun Lanyue Cui Yuhong zou Cuie Wen Rongchang zeng Department of Bioengineering College of Chemical and Biological EngineeringShandong University of Science and TechnologyQingdao 266590China Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China school of Engineering RMIT UniversityMelbourneVIC3001Australia

Biliary stenting is an important interventional method for the prevention and treatment of biliary tract ***,complications,such as postoperative biliary infection and re-stenosis,frequently occur due to the extensive scope of the biliary system and the complex composition of *** com-bination of coating technology and biliary stents is expected to bring new approaches to the solution of these *** cutting-edge advance on functional coatings on biliary stents is reviewed from seven perspectives:anticorrosion,-bacterial,-tumor,stone-dissolving,X-ray visibility,anti-stent migration and functional composite *** de-velopment trend is also *** performance of the numerous functional coatings for various purposes is generally up to expectations,but the balance between the medica tions'effectiveness and their safety needs to be further *** contemporary investigations have advanced to the leve of animal experiments,offering crucial fundamental assurance for broader human *** combination of biliary stent and functional coatings is an innovative idea with great potential for future development.

关键词： biliary stent coating anticorrosion antibacterial antitumor stone-dissolving X-ray visibility antistent migration

双电极焊条单弧焊的熔化特性 Ⅱ.电弧对两焊芯熔化的自调节作用

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焊接学报 2006年第4期27卷 61-63,80页

作者：韩彬邹增大曲仕尧中国石油大学(华东)机电工程学院东营257061 山东大学材料科学与工程学院济南250061

两焊芯熔化速度能否保持一致是双电极焊条单弧焊过程能否稳定进行的关键。研究表明,双电极焊条两焊芯熔化的一致性受焊条类型、焊接电流等因素的影响。双电极焊条两焊芯熔化一致的充分条件为U阳效等于U阴效,两者差值越大则焊芯熔化不一... 详细信息

两焊芯熔化速度能否保持一致是双电极焊条单弧焊过程能否稳定进行的关键。研究表明,双电极焊条两焊芯熔化的一致性受焊条类型、焊接电流等因素的影响。双电极焊条两焊芯熔化一致的充分条件为U阳效等于U阴效,两者差值越大则焊芯熔化不一致程度越大。双电极焊条单弧焊电弧对两焊芯的熔化存在自调节作用,即电弧燃烧过程中两焊芯端部在电弧中的长度不等,两焊芯仍能保持等速熔化,使电弧燃烧过程能够稳定进行。电弧自调节作用原理是由于两焊芯端部在弧柱区的长度不同,伸入弧柱区中较长的焊芯从弧柱区获得更多的热量,而加快其熔化,从而起到电弧的自调节作用。一般随焊芯间距的减小及焊接电流的增大,电弧自调节作用增强。

关键词：双电极焊条单弧焊工艺焊芯熔化自调节作用

双电极焊条单弧焊的熔化特性 Ⅰ.双电极焊条的加热和熔化

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焊接学报 2006年第3期27卷 81-85页

作者：韩彬邹增大曲仕尧中国石油大学机电工程学院山东东营257061 山东大学材料科学与工程学院济南250061

通过测量双电极焊条的动态温升等试验方法研究了双电极焊条单弧焊中双电极焊条的加热和熔化。研究结果表明，双电极焊条的熔化系数随焊接电流的增大、药皮重量系数和焊芯间距的减小而增大，是单芯焊条的2—3倍。加热和熔化双电极焊条的... 详细信息

通过测量双电极焊条的动态温升等试验方法研究了双电极焊条单弧焊中双电极焊条的加热和熔化。研究结果表明，双电极焊条的熔化系数随焊接电流的增大、药皮重量系数和焊芯间距的减小而增大，是单芯焊条的2—3倍。加热和熔化双电极焊条的能量有焦耳效应产生的电阻热、电弧通过熔滴传给焊条端部的热；焊条的熔化主要依靠电弧的热量。在焊接终了时，随焊接电流增大，焊芯温度升高增大；对于200A的焊接电流。TE4303焊条的温度升高到750K以上；TE308—16焊条具有更大的温升和更快的熔化速度。电弧热在焊条上所形成的温度场一般集中在焊条燃烧的端部16mm以内。由于电阻热的作用，焊接终了时的熔化速度比焊接开始时快了约20％。

关键词：双电极焊条单弧焊工艺加热和熔化电阻热电弧热

石墨添加量对Fe-Ti-V-C熔覆层组织及耐磨性的影响

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摩擦学学报 2014年第3期34卷 319-324页

作者：张辉邹勇邹增大郝玉林山东大学材料液固结构演变与加工教育部重点实验室山东济南250061

通过激光熔覆在低碳钢表面获得Fe-Ti-V-C铁基熔覆层,利用X射线衍射(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)、显微硬度计和磨粒磨损试验机,分析比较了熔覆粉末中不同的石墨添加量对Fe-Ti-V-C熔覆层物相组成、硬度和耐... 详细信息

通过激光熔覆在低碳钢表面获得Fe-Ti-V-C铁基熔覆层,利用X射线衍射(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)、显微硬度计和磨粒磨损试验机,分析比较了熔覆粉末中不同的石墨添加量对Fe-Ti-V-C熔覆层物相组成、硬度和耐磨性的影响.结果表明:熔覆层中碳化物为均匀分布的TiVC2和***2呈多角块状或枫叶状,VC呈小块状或细长条状,且碳化物数量随石墨加入量的增加而增加.熔覆粉末中石墨添加量过多时,熔覆层中出现残余奥氏体.一定范围内,熔覆层的硬度与耐磨性随石墨加入量的增加呈现先显著提高后降低的趋势.进行多层熔覆时存在回火软化现象,且熔覆层硬度越高回火软化现象越明显.

关键词：激光熔覆石墨添加量 TiVC2 VC 磨粒磨损