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Effect of interlayer on the mechanical properties of YG8 hard carbide/40Cr steel brazed joints

China Welding 2009年第2期18卷 30-34页

作者：吴铭方浦娟陈健 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003

The effects of Cu foil and Ni foil on the mechanical properties of YG8 hard carbide/4OCr steel brazed joints were investigated. The results show that both Cu foil and Ni foil were beneficial to decrease the residual stress and enhance the joint strength. Moreover, Ni foil exhibited the better impact on enhancing the joint strength relative to Cu foil. When Cu foil was used as interlayer material, the key factor to restrain the joint strength was the massive and quick dissolution of Cu. Therefore, in order to prevent the excessive dissolution of Cu foil, the process parameter should be controlled strictly in the brazing process.

关键词： YG8 hard carbide 40Cr steel brazing interlayer strength

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Strength and interfacial microstructure of Si3N4 joint brazed with amorphous Ti-Zr-Ni-Cu filler metal

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China Welding 2009年第1期18卷 57-61页

作者：邹家生周权吕思聪 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003

In this paper, the vacuum brazing of Si3N4 ceramic was carried out with Ti40Zr25Ni15Cu20 amorphous filler metal. The interfacial microstructure was investigated by scanning electron microscopy （ SEM ）, energy dispersive spectroscopy （EDS） etc. According to the analysis, the interface reaction layer was mode up of TiN abut on the ceramic and the Ti-Si, Zr-Si compounds. The influence of brazing temperature and holding time on the joint strength was also studied. The results shows that the joint strength first increased and then decreased with the increasing of holding time and brazing temperature. The joint strength was significantly affected by the thickness of the reaction layer. Under the same experimental conditions, the joint brazed with amorphous filler metal exhibits much higher strength compared with the one brazed with crystalline filler metal with the same composition. To achieve higher joint strength at relatively low temperature, it is favorable to use the amorphous filler metal than the crystalline filler metal.

关键词： Ti-Zr-Ni-Cu amorphous filler metal Si3 N4 ceramics joint strength interfacial structure

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The Corrosion Behavior of Ni-Y Binary Alloys in Air and in Molten (0.62Li,0.38K)_2CO_3 Mixture at 650℃

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Journal of Wuhan University of technology(Materials Science) 2009年第S1期24卷 115-118页

作者：郭平义 Jiangsu Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology

The corrosion behavior of pure Ni and of binary Ni-Y alloys containing 1wt%,3wt%,5wt% Y,respectively,was investigated in air and in the eutectic (0.62Li,0.38K)2CO3 mixture at 650 ℃.The alloys are two-phase composed of γ-Ni solid solution and intermetallic compound *** experimental results indicated that the corrosion of Ni-Y alloys in air and in molten salts,respectively,produced an external NiO scale with a small amount of Y2O3 and an internal oxidation region composed of Ni and Y2O3 resulting from the oxidation of the intermetallic phase *** presence of yttrium in the alloy had a positive effect on the lithiation reaction of NiO during immersion in the melt.

关键词： molten carbonates Ni-Y alloys oxidation corrosion

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Effects of Ga and In on the properties of cadmium-free Ag-Cu-Zn filler metal

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China Welding 2009年第4期18卷 33-38页

作者：赖忠民薛松柏卢方焱顾立勇顾文华 College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003. Changshu Huayin Filler Metals Co. Ltd. Changshu 215513.

Melting temperature, spreadability, mechanical properties and the microstructures of joints brazed with silver-base filler metals including different amounts of Ga and/or In were studied respectively in this paper, and the results show that the melting temperature of the silver-base filler metals is decreased, spreadability of the silver-base filler metals is improved, and the microstructures of silver-base filh, r metals are refined obviously with the addition of Ga and/or In. Using copper and brass plates as base metal and brazing with flame method, the mechanical properties of the lap-joint and butt joint were also examined and analyzed respectively, and the results indicate that the fracture position of two kinds of brazed joints occurred on the base metal, except for the lap-joint of brass, which shows better mechanical properties of the joints brazed with the silver- based filler metals including Ga. For the lap-joint of brass, the tensile strength gradually increased with the increase of Ga content, while the addition of In has little effect on mechanical properties. It is also found that the best comprehensive properties of cadmium-free Ag-Cu-Zn filler metals are obtained when Ga content is about 3.0 wt. % and In content is between 1.5 wt. % and 2. 0 wt. %.

关键词： silver-base filler metal melting temperature spreadability mechanical properties mierostructure

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Development of a novel pulsed arc system for precision plasma cutting

Development of a novel pulsed arc system for precision plasm...

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IEEE International Conference on Mechatronics and Automation

作者： Jiayou Wang Conghui He Junhua Yu Feng Yang Jiangsu Provincial Key Laboratory of Advanced Welding Technology School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang Jiangsu China

The current pulsation is one of effective manners to contract and thus stiffen plasma cutting arc. The present work develops a novel pulsed arc system for precision plasma cutting, by paralleling the ultrasonic-frequency pulse generator with conventional plasma cutting power supply. The implementation of the system is introduced, and then its electrical and vibration characteristics are investigated in detail. Cutting experimental results finally show that the pulsed arc process can improve plasma cut quality obviously while increasing the electrode life, and thus demonstrate the effectiveness of the system.

关键词： Plasmas

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Electrocatalysts: Facile Construction of Pt-Co/CNx Nanotube Electrocatalysts and Their Application to the Oxygen Reduction Reaction (Adv. Mater. 48/2009)

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advanced materials (Deerfield Beach, Fla.) 2009年第48期21卷

作者： Shujuan Jiang Yanwen Ma Guoqiang Jian Haisheng Tao Xizhang Wang Yining Fan Yinong Lu Zheng Hu Yi Chen Key Laboratory of Mesoscopic Chemistry of MOE and Jiangsu Provincial Lab for Nanotechnology School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 (P. R. China). Jiangsu Key Lab for Organic Electronics and Information Displays Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing 210003 (P. R. China). College of Materials Science and Engineering Nanjing University of Technology Nanjing 210009 (P. R. China).

Pt-Co alloyed nanoparticles can be facilely immobilized onto CNx nanotubes due to the incorporated nitrogen, report Yanwen Ma, Zheng Hu, and co-workers on p. 4953. The as-prepared electrocatalysts exhibit good performance for oxygen reduction reactions in acidic media arising from the high dispersion and alloying effect of Pt-Co nanoparticles, as well as the intrinsic catalytic capacity of CNx nanotubes, which is significant for the development of fuel cells.

关键词： Alloys Carbon nanotubes Electrochemistry Fuel cells Nanoparticles

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Influence of arc pressure on the forming of molten pool in tungsten inert gas arc butt welding with micro gap for tantalum sheet

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China Welding 2006年第3期15卷 64-67页

作者：周方明钱乙余 State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003

Arc pressure is the key influencing factor to forming of molten pool. Countering the characteristic of tungsten inert gas arc welding with micro gap for tantalum sheet, according to the fundament of arc physics, a distribution model of arc pressure and forming mechanism of molten pool with micro butt gap are proposed, and the influences of arc pressure on forming of molten pool are discussed. Experimental researches for the dynamic formation process of weld molten pool by using high-speed vidicon camera show that when butt gap is appropriate, that is from 0. 1 to 0. 15 mm, molten metals formed on two workpiece uplift and grow up first, then are fused and form uniform molten pool finally.

关键词： arc pressure tantalum sheet micro butt gap tungsten inert gas welding mechanism of forming

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Analysis of Local Structures around Ni Atoms Doped in ZnO-Based Diluted Magnetic Semiconductors by Fluorescence EXAFS

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Chinese Physics Letters 2006年第4期23卷 907-910页

作者：李斌斌修向前张荣陶志阔陈琳谢自力郑有炓贺博 Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials Department of Physics Nanjing University Nanjing 210093 National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026

Zn1-xNixO （x = 0.001, 0.01, 0.02, 0.05 and 0.20） powders are prepared by sol-gel method. An extended x-ray absorption fine structure technique （EXAFS） for the Ni *** is employed to probe the local structures around Ni atoms doped in ZnO powders by fluorescence mode. The near edge EXAFS of the samples does not change in the range of Ni concentration from x = 0.001 to 0.05, which is consistent with the results of x-ray diffraction of the samples. The simulation results for the first shell EXAFS signals indicated that Ni atoms are substituted in Zn sites.

关键词： ABSORPTION FINE-STRUCTURE THIN-FILMS FERROMAGNETISM ORIGIN

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Interfacial structure and joint strengthening in arc brazed galvanized steels with copper based filler

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中国有色金属学会会刊：英文版 2006年第2期16卷 397-401页

作者：李瑞峰于治水祁凯 Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003 China College of Materials Engineering Shanghai Univers ity of Engineering Science Shanghai 200336 China

Galvanized steel sheets were joined by tungsten inert gas(TIG) and metal inert gas(MIG) brazing process using copper based filler. The results show that the joint zone hardness is higher than that of the base material or copper filler from the microhardness tests of TIG brazing specimens, and the fracture spot is at the base materials zone from the tensile tests of MIG brazing specimens. Examination using energy dispersive X-ray analysis reveals the presence of intermetallic compound Fe5Si3(Cu) in the joint. The dispersal of fine Fe5Si3(Cu) particles is the main strengthening factor for the joint. The Fe5Si3(Cu) particles are determined to arise from three sources, namely, spot micro-melt, whisker-like fragmentation and dissolve-separation actions.

关键词：镀锌钢 CuSi3 TIG MIG 电弧钎焊接头强度显微结构

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Ti/Fe EUTECTIC REACTION PROCESS

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Chinese Journal of Mechanical Engineering 2006年第4期19卷 614-617页

作者： WU Mingfang MA Cheng YANG Min Provincial Key Laboratory of Advanced Welding Technology Jiangsu University of Science and Technology Zhenjiang 212003 China School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China

To obtain satisfactory joining between titanium alloys end stainless steel, it is of great significance to study the process of Ti-Fe eutectic reaction. The preliminary studies about the liquid forming, spreading end the structure of the contact reaction between pure Ti and pure Fe are carried out at 1 120℃ for different holding times in high-frequency induction heated vacuum furnace. The results show that for Fe（particle-like）/Ti（plate-like） contact reaction couples, owing to Fe＇s higher density then titanium＇s, the Fe/Ti eutectic reaction develops in the thickness direction of plate-like Ti, named ＂deposition effect＂. Then the eutectic reaction can be realized without the inter-diffusion between Ti end Fe atoms, so the formation rate of the liquid phase is very quick. For Ti （particle-like）/ Fe （plate-like） contact reaction couples, the eutectic reaction has a strong direction, i.e. the eutectic liquid is formed mostly at the Ti side, which leads to much dissolution of Ti particle end very little dissolution of the Fe base metal. It can be seen that the diffusion rate of Fe in Ti determines the whole process of the eutectic reaction, behaved as that the dissolution rate of Ti （particle-like）/ Fe （plate-like） is much lower then that of Fe（particle-like）/Ti（plate-like）, end the dissolution rate of Ti obeys the square root law. Whatever means the Ti, Fe are assembled by, only dissolution process can be founded, the spread phenomena is unobvious, which is concerned with the formation of the inter- metallic compounds end the ＂deposition effect＂ of Fe.

关键词： Ti Fe Eutectic reaction Dissolution Spread

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