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joining of Co coated ferritic stainless steel to ceramic solid oxide cells by a novel Ag-SiO_(2) braze

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Journal of Materials Science & Technology 2022年第26期121卷 174-180页

作者： Zhiquan Wang Chun Li Ragnar Kiebach Ilaria Ritucci Ming Chen Jian Cao State Key Laboratory of Advanced Welding and joining Harbin Institute of TechnologyHarbin 150001China Department of Energy Conversion and Storage Technical University of DenmarkLyngby CampusAnker Engelunds Vej2800Denmark

A novel Ag-SiO_(2) braze for Solid Oxide Cells was successfully developed and applied to join Co coated AISI 441 ferritic stainless steel to YSZ-NiO half cells.The braze showed an improved wettability on the coated steel and the YSZ compared to pure Ag.A defect-free steel/YSZ joint was obtained using an Ag-1SiO_(2) braze jointed at 1000℃for 30 min in air.The microstructure of the joints was characterized by scanning electron microscopy and transmission electron microscopy with energy-dispersive X-ray spectroscopy.Furthermore,a Co-Si-O_(2)phase diagram was calculated and used to explain the experimental results and formulate a reaction mechanism.It was found,that during the air brazing process,Co_(3)O_(4)and(Co,Fe)_(3)O_(4)are formed by the oxidation of the prefabricated Co coating.The growth of Cr_(2)O_(3)was effectively impeded by the formed Co-based spinels.In a second step,Co_(2)O_(3)reacts with the SiOpresent in braze.The CoSiOformed by the reaction ensures a firm bonding between the steel and Ag-SiObraze.

关键词： Co coated stainless steel YSZ-NiO half cell Microstructure Interfacial reaction joining Ag-SiO_(2)braze Solid Oxide Cells

joining of dissimilar metals between magnesium AZ31B and aluminum A6061-T6 using galvanized steel as a transition joining layer

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Journal of Iron and Steel Research(International) 2022年第4期29卷 677-686页

作者： Wei Li Jing-huan Chang Bao-feng Wen Rui Cao State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050GansuChina Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

A galvanized steel is used to join Mg AZ31B alloy and Al A6061-T6 alloy as a joining transition layer by cold metal transfer(CMT)method.Firstly,to optimize the process variables,extensive welding tests were performed by a design of experiment method.Then,microstructures,joining mechanisms and tensile properties were characterized and analyzed.Results indicated that Mg and Al alloys can be joined by using galvanized steel as a joining transition layer and cold metal transfer welding method.The formed joint is called as a Mg–steel–Al CMT joint.By using galvanized steel transition joining layer,Mg–Al brittle intermetallics Al12Mg17 and Al3Mg2 were inhibited.The properties of Mg–steel–Al CMT joints have been improved after optimizing the welding variables.The strength of Mg–steel–Al CMT joint is comparable to those of Al–Al joint and Mg–Mg joint.The strength of Mg–steel–Al CMT joint can reach 100%that of Al–Al joint and Al–steel joint,and reach 90%that of Mg–Mg joint and Mg–steel joint.The optimized Mg–steel–Al CMT welded joint with galvanized steel transition layer is fractured at the heat affected zone of Al base metal rather than at the weld-brazed interface,due to softening of Al base metal.

关键词： Cold metal transfer Mg alloy Al alloy Galvanized steel Transition joining layer Dissimilar metal joining

Near-seamless joining of Cf/SiC composites using Y_(3)Si_(2)C_(2)via electric field-assisted sintering technique

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Journal of Advanced Ceramics 2022年第8期11卷 1196-1207页

作者： Teng YU Jie XU Xiaobing ZHOU Peter TATARKO Yang LI Zhengren HUANG Qing HUANG Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Inorganic Chemistry Slovak Academy of SciencesDúbravskácesta 984536 BratislavaSlovakia Centre of Excellence for Advanced Materials Application Slovak Academy of SciencesDúbravskácesta 984511 BratislavaSlovakia National Key Laboratory of Science and Technology on High-Strength Structural Materials Central South UniversityChangsha 410083China

A novel Y_(3)Si_(2)C_(2)material was synthesized at a relatively low temperature(900℃)using a molten salt method for the first time,and subsequently used as the joining material for carbon fiber reinforced SiC(Cf/SiC)composites.The sound near-seamless joints with no obvious remaining interlayer were obtained at 1600℃using an electric field-assisted sintering technique(FAST).During joining,a liquid phase was formed by the eutectic reaction among Y_(3)Si_(2)C_(2),γ(Y–C)phase,and SiC,followed by the precipitation of SiC particles.The presence of the liquid promoted the sintering of newly formed SiC particles,leading to their complete consolidation with the Cf/SiC matrix.On the other hand,the excess of the liquid was pushed away from the joining area under the effect of a uniaxial pressure of 30 MPa,leading to the formation of the near-seamless joints.The highest shear strength(Ä)of 17.2±2.9 MPa was obtained after being joined at 1600℃for 10 min.The failure of the joints occurred in the Cf/SiC matrix,indicating that the interface was stronger than that of the Cf/SiC matrix.The formation of a near-seamless joint minimizes the mismatch of thermal expansion coefficients and also irradiation-induced swelling,suggesting that the proposed joining strategy can be potentially applied to SiC-based ceramic matrix composites(CMCs)for extreme environmental applications.

关键词： Cf/SiC joining Y_(3)Si_(2)C_(2) electric field-assisted sintering technique(FAST)

joining and surfacing of advanced materials

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 25-35页

作者： Andrzej Kolasa Wladyslaw Wlosinski Department of joining Engineering Institute of Materials TechnologyWarsaw University of Technology Poland Department of Joining Engineering Institute of Materials TechnologyWarsaw University of Technology Poland

The application of advanced materials, i.e. advanced ceramics, glasses, intermetallic phases and various type of composites, not only depends on their manufacture processes including a great input of know-how, but also on their abilities for processing, among which the joining processes play an important role. The uses of advanced materials are changing rapidly, with a major emphasis on technical applications, especially the components of machines, apparatus and technical devices expected to withstand very heavy exploitation conditions. Furthermore,these materials are becoming more complex, in terms of being strengthened and toughened by transformation processes as well as by the addition of other ceramic or metallic materials including nanomaterials. The successful use of advanced materials requires the development of equally advanced joining materials, processes and technology. Some selected examples of results of joining advanced materials with the use of various procedures as well as surface modification of structural components with the use of advanced materials obtained in the Welding Engineering Department of Warsaw University of Technology, Poland, are presented.

关键词： advanced materials joining surfacing surface modification

joining dense Si3N4 to porous Si3N4 by using an anorthite based glass-ceramic

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Science China(Technological Sciences) 2020年第8期63卷 1538-1548页

作者： FANG Jian ZHANG Jie LIU ChunFeng SUN LiangBo GUO SongSong WANG DongBao School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Center of Analysis and Measurement Harbin Institute of TechnologyHarbin 150001China

This study focuses on the design,characterization and testing of a novel anorthite based glass-ceramic solder for joining dense Si3N4 and porous Si3N4 ceramic.It was found that the glass solder possesses a favorable wetting ability on two ceramic surfaces.Additionally,the influence of crystallization treatment on the microstructure and shear strength of joints was investigated.The results showed that CaAl2 Si2O8 was the main product in the seam.After crystallization treatment,the crystallinitiy of the seam and shear strength of joints were improved obviously.The shear strength of joints after crystallization was 52 MPa at room temperature,and it increased to 59 MPa at 850℃.Finally,the joining mechanism of the dense Si3N4/glass-ceramic/porous Si3N4 bonded joints was proposed.Intergranular diffusion of elements was identified as the main mechanism of bonding in the interface of dense Si3N4/glass-ceramic.In the porous Si3N4 side,the bonding was achieved by infiltration that was controlled by capillarity and resistance of the viscous forces.

关键词： Si3N4 ceramic glass-ceramic joining microstructure shear strength

joining Al_2O_3-ZrO_2 Ceramics by Direct Oxidizing Metal Method

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Journal of Rare Earths 2005年第S1期23卷 182-184页

作者：叶浩刘家臣张君娣 Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin University Tianjin 300072 China

Effects of interlayer composition on bonding strength and interfacial microstructure of green joined Al_2O_3-ZrO_2 ceramics were studied in this paper. Green bodies of Al_2O_3 and ZrO_2 ceramics were joined by using interlayer composed of Al_2O_3-Al-SiO_2 system at 1550 ℃ for 2 h without applied pressure. The effect of Al on the bond strength and microstructure of the joints were investigated. Through comparing five approaches or conditions, the results indicate that when adding 22% Al, the joints are the best in terms of bend strength and the microstructures of the joints are homogeneous and without obvious cracks, pores and defects.

关键词： joining oxidation alumina zirconia

joining of SiO2f/SiO2 composite to Nb using Ag-Cu-In-Ti brazing alloys

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Journal of Materials Science & Technology 2020年第15期47卷 13-20页

作者： Bo Chen Wen-Jiang Zou Wen-Wen Li Shi-Biao Wu Hua-Ping Xiong Xin Wu Welding and Plastic Forming Division Beijing Institute of Aeronautical MaterialsBeijing100095China

Three compositions of Ag-Cu-In-Ti system brazing alloys were designed for joining SiO2 f/SiO2 ceramic composite to Nb metal.The wettability of the three alloys on the composite was studied with the sessile drop method.The results showed that after heating at 1073 K for 30 min,they exhibited contact angles of 74°,83° and 86°,respectively.The brazing alloys were fabricated into foils by rapid solidification technique.Among the three brazing filler alloys the joints brazed with AgCu-10 In-5 Ti at 1073 K for 10 min presented the maximum average shear strength of 30.9 MPa.During the brazing process the active element Ti diffused strongly from the filler alloy to the composite surface and a reaction layer with a thickness of 2-3 μm was formed.Sound metallurgical bonding was also achieved at the Nb side.The interface structure of the joint brazed with the AgCu-10 In-5 Ti alloy can be described as the following sequence:SiO2 f/SiO2→SiO2+Cu3 Ti3 O→SiO2+TiO+Ti5 Si4→Ag(s,s)+(Cu-Ti)→Nb.However,for the filler alloy with 4.0 wt% Ti content the joint strength was only 15.8 MPa.

关键词： joining Composites Strength SiO2

joining Performance and Microstructure of the 2024/7075 Aluminium Alloys Welded Joints by Vaporizing Foil Actuator Welding

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Journal of Wuhan University of Technology(Materials Science) 2019年第2期34卷 368-372页

作者：孟正华 WANG Xu GUO Wei HU Zhili Anupam Vivek HUA Lin Glenn S DAEHN Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Department of Materials Science and Engineering The Ohio State University

Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing parameters can be prepared by using VFAW. Dynamic preform addresses the poor formability problem of target material and advantage of VFAW on dissimilar materials in some conditions. But with standoff sheet inserting in the flyer and target, 2024/7075 welded pairs gets the better weld strength, compared with flyer preformed method. The microstructure of the circular weld area of the welded joint showed a wave interface, in which a thin melt layer formed at the center and edge parts. The crystal grains near the bonding interface were remarkably elongated and refined. Therefore, the joining of the 2024/7075 pairs was facilitated through plastic forming and melting.

关键词： impact welding dissimilar materials vaporizing foil actuator joining interface

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Acta Metallurgica Sinica(English Letters) 2013年第6期26卷 721-727页

作者： A.R.Khalifeh A.Dehghan E.Hajjari Department of Materials Science and Engineering School of EngineeringShiraz University Department of Materials Science and Engineering Faculty of EngineeringShahid Chamran University

In present work the weldings of an austenitic stainless steel （AISI 304L） and a ferritic carbon steel （St37） were conducted by tungsten inert gas （TIG） welding process using four different austenitic filler metals, namely ER308L, ER309L, ER316L and ER310. Microstructure characteristics and mechanical properties of the weldments were studied using optical and scanning electron microscopy, ferrit-ometry, hardness, tensile and impact tests. The ferrite number （_N-~） of the weldments made by different electrodes varies between 0.5 and 9.5. It was found that the increase in amount of delta ferrite in the microstructure of the weld metals, causes the decrease of the impact toughness of the weldments. It seems that using ER309L and ER316L electrodes can provide a good combination between the mechanical and metallurgical properties of the joint in AISI 304L/St37 dissimilar welding.

关键词： Ferrous alloys joining Microstructure Mechanical properties Electrode