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Brazing of C/C composite and Ti-6Al-4V with graphene strengthened AgCuTi filler:Effects of graphene on wettability,microstructure and mechanical properties

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Chinese Journal of Aeronautics 2018年第7期31卷 1602-1608页

作者： Duo LIU Yanyu song Yinghao ZHOU xiaoguo song Wei FU Jicai FENG State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at Weihai

Graphene nanosheets（GNSs） strengthened AgCuTi composite filler（AgCuTiG） was used to braze C/C composite and Ti-6Al-4V. The effects of GNSs on the wettability of AgCuTiG filler on the C/C composite surface and the interfacial microstructure and mechanical properties of brazed joints were investigated. The results indicate that the addition of GNSs reduced the wettability of AgCuTiG. The interfacial microstructure of brazed joints evolved with the addition of GNSs, where Ti3Cu4 and TiCu4 were converted to TiCu and the thickness of the reaction layer adjacent to the base material decreased. The maximum shear strength of joints brazed at 0.3 wt% GNSs was 23.3 MPa（880℃/10 min）. Further adding GNSs deteriorated the shear strength of the joints. Fracture of the joints occurred in the C/C composite substrate and the TiC layer adjacent to C/C composite.

关键词： Brazing Graphene nanosheets Mechanical properties Microstructure Wetting

Interfacial characteristics in CNTs-AgCuTi systems

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Chinese Journal of Aeronautics 2022年第4期35卷 450-460页

作者： Duo LIU Bin CHEN Guobiao JIN Yanyu song Qi ZHANG xiaoguo song Jian CAO State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology WeihaiWeihai 264209China

AgCuTi-based composite fillers reinforced with Carbon Nanotubes(CNTs) were prepared by mechanical ball milling and ultrasonic agitation. The morphological features, chemical components, and melting characteristics of the composite fillers with different content of CNTs addition were investigated using Field Emission Scanning Electron Microscopy(FESEM), XRay Diffraction(XRD) and a Differential Scanning Calorimeter(DSC). After being heated at 900 ℃, the microstructure of the composite fillers was examined through FESEM and Transmission Electron Microscopy(TEM) to analyze the interfacial characteristics in the AgCuTi-CNTs *** microstructures of the composite fillers with 0.5 wt% CNTs and 0.1 wt% CNTs were compared. It was found that 0.5 wt% CNTs were favorable for dispersive distribution of the ***-sized TiC particles formed in the reaction of CNTs with Ti, resulting in the transformation of TiCu;with high Ti content and Ti;Cu;phases to TiCu;phase with low Ti content. Additionally,the microstructure evolution of the composite fillers was studied by changing the ratio of Ti/*** showed that CNTs significantly influenced the wettability of the AgCuTi filler. After addition of 0.3 wt% of CNTs, the spreading area of the composite filler on the C/C composite increased by 146.0%.

关键词： AgCuTi Carbon nanotubes Composite filler Interfacial reaction Microstructure TiC particles

Characterization,Removal and Evaluation of Oxide Film in the Diffusion Bonding of Zr_(55)Cu_(30)Ni_5Al_(10) Bulk Metallic Glass

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Journal of Materials Science & Technology 2014年第7期30卷 722-730页

作者： Haiyan Chen Jian Cao xiaoguo song Jiakun Liu Jicai Feng State Key Lab of Advanced Welding and Joining Harbin Institute of Technology School of Materials Science and Engineering Harbin Institute of Technology at Weihai

The composition of oxide film of ZrssCu3oNi5Al10 bulk metallic glass was identified by X-ray photoelectron spectroscopy. In addition, the relatively sound joints of bulk metallic glass without macroscopic deformation were obtained by removing the oxide film before diffusion bonding. The joint interfaces were observed by scanning electron microscopy and atomic force microscopy. The hardness of joints near the interface was higher than that far away from the interface, which is attributed to the difference of structural relaxation. According to the result of micro-focused X-ray diffractometry and transmission electron microscopy, the joints retained the amorphous structure when the holding time is less than 20 min. The surface area fraction of oxide film on the interface of joints was detected by ultrasonic inspection. Moreover, the surface area fraction of oxide film is in excellent agreement with the theoretical value calculated by shear strength. The result indicated that surface oxide film is the dominant barrier on the diffusion bonding of bulk metallic glass rather than low atomic diffusion coefficient.

关键词： Bulk metallie glass Diffusion Surface Diffusion bonding Oxide film

Multi-scale modeling for prediction of mechanical performance in brazed GH99 thin-walled structure

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Chinese Journal of Aeronautics 2024年第7期37卷 550-563页

作者： Yazhou LIU Shengpeng HU Yanyu song Wei FU xiaoguo song Ning GUO Weimin LONG State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Institute of Shipbuilding Technology Weihai 264209China China Machinery Intelligent Equipment Innovation Research Institute(Ningbo)Co. Ltd.Ningbo 315700China

Superalloy thin-walled structures are achieved mainly by brazing,but the deformation process of brazed joints is non-uniform,making it a challenging research *** paper records a thorough investigation of the effect of brazing parameters on the microstructure of joints and its mechanical properties,which mainly inquires into the deformation and fracture mechanisms in the shearing process of GH99/BNi-5a/GH99 *** macroscopic-microscopic deformation mechanism of the brazing interface during shearing was studied by Crystal Plasticity(CP)and Molecular Dynamics(MD)on the basis of the optimal brazing *** experimental results show that the brazing interface is mainly formed by(Ni,Cr,Co)(s,s)and possesses a shear strength of approximately 546 *** shearing fracture of the brazed joint occurs along the brazing seam,displaying the characteristics of intergranular *** simulations show that dislocations disassociate and transform into fine twinning with increased *** simulated the shear deformation process of the brazed *** multiscale simulation results are consistent with the experimental *** mechanical properties of thin-walled materials for brazing are predicted using MD and CP methods.

关键词： Multi-scale modeling Brazing Shear mechanisms Crystal plasticity GH99 superalloy

Laser joining of CFRTP to titanium alloy via laser surface texturing

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Chinese Journal of Aeronautics 2021年第5期34卷 103-114页

作者： Caiwang TAN Jianhui SU Ziwei FENG Yifan LIU Bo CHEN xiaoguo song State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihcii 264209China

Grid pattern was textured on Ti-6 Al-4 V alloy(TC4)substrate surface by nanosecond laser *** joining of carbon fiber reinforced thermoplastic composite(CFRTP)to TC4 joints were performed,and the effect of texture grid depth was *** contact angle of molten CFRTP on textured TC4 surface was measured and the tensile-shear force was *** fracture surface and interface morphology were *** results indicated that the wettability of molten CFRTP on TC4 surface improved remarkably after laser textured *** force of CFRTP/TC4 joints was increased by 156%after laser textured TC4 *** the depth of grid was deeper than 100μm,contact angle increased and incomplete filling of molten CFRTP in grid occurred,the shear force thus decreased ***-carbon fibers mixture was adhered on the fracture surface of TC4,and the variation tendency of adhesion ratio was consistent with that of shear ***4 matrix was exfoliated from substrate and adhered at the fracture surface of CFRTP,indicating stronger mechanical interlocking occurred at the joining interface after laser textured TC4 *** mechanical interlocking,compound layer consisted of CTi_(0.42)V_(1.58)carburization phase was also confirmed at interface,suggesting that chemical bonding also occurred at the joining interface.

关键词： Carbon fiber reinforced thermoplastic composite(CFRTP) Grid depth Laser joining Laser texturing TC4

Wetting behavior of AgCu-4.5Ti filler reinforced by carbon nanotubes on C/C composite

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Chinese Journal of Aeronautics 2021年第12期34卷 205-213页

作者： Xingyi LI Ling LIU Yanyu song Duo LIU Shengpeng HU xiaoguo song Jian CAO State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Prorincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China Hun cm Marketing Company PetroChina Company LimitedChangsha 410005China

The effect of Carbon Nanotubes(CNTs)content on the wettability of AgCu-4.5Ti+x CNTs(wt%)composite filler alloys on C/C composite was *** results show that the added CNTs reacted with element Ti in the filler and produced the dispersed fine in situ synthesized TiC particles,which increased the consumption of element Ti and provided the nucleus for the growth of Ti-Cu compounds *** above effects of introducing CNTs,inhibited the formation of Ti-Cu compounds,also changed the distribution of compounds,which dramatically influenced the interfacial microstructure and characteristics of wetting *** increase of CNTs content refined and dispersed coarse Ti-Cu compounds,decreased the initial spreading temperature,and improved the wettability,but high content of CNTs(more than 0.3 wt%)decreased the wettability of the filler *** wetting interfacial microstructure of corresponding composite filler alloys were analyzed by Scanning Electron Microscope(SEM),Energy Dispersive X-ray Spectrometer(EDS)and Transmission Electron Microscope(TEM),which consisted of TiC,TiCu,TiCu;and TiCu;*** typical wetting behavior of AgCu-4.5Ti+0.3wt%CNTs composite filler on C/C composite was divided into four *** effect mechanism of CNTs content on the wetting behavior was proposed.

关键词： C/C composite Carbon Nanotubes(CNTs) Composite filler Microstructure Wetting

Vacuum brazing of GH99 superalloy using graphene reinforced BNi-2 composite filler

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Journal of Materials Science & Technology 2018年第10期34卷 1843-1850页

作者： Duo Liu Yanyu song Bin Shi Qi Zhang xiaoguo song Hongwei Niu Jicai Feng State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at Weihai

A novel graphene reinforced BNi-2 composite filler was developed for brazing GH99 superalloy. The interracial microstructure of brazed joints was analyzed by field emission scanning electron microscope and a transmission electron microscope. The effects of graphene addition on the microstructure evolu-tion and mechanical properties of brazed joints were investigated, and the strengthening mechanism of graphene was analyzed. The results revealed that due to the addition of graphene, M23（C,B）6 compounds were synthesized in the y solid solution and brittle boride precipitates near the brazing seam decreased. Graphene was effective in retarding solute atoms diffusion thus impeding the precipitation of borides. Furthermore, the low coefficient of thermal expansion （CTE） of graphene was conducive to relieve stress concentration of the brazed joints during the cooling process. The shear strengths of brazed joints were significantly improved by exerting the strengthening effect of graphene. The maximum shear strengths of the brazed joints were 410.4 MPa and 329.7 MPa at room temperature and 800 ℃, respectively.

关键词： Graphene GH99 superalloy Brazing Microstructure Mechanical properties

Fabrication of Si_(3)N_(4)/Cu direct-bonded heterogeneous interface assisted by laser irradiation

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Journal of Materials Science & Technology 2022年第4期99卷 169-177页

作者： Yanyu song Duo Liu Guobiao Jin Haitao Zhu Naibin Chen Shengpeng Hu xiaoguo song Jian Cao State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Provincial Key Lab of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China

Joining of ceramic and metal is a key component in microelectronic device manufacturing,in which the integrity of bonded interface is critical in the performance and stability of the *** methods with a problem of thick transition layer at the interface impeded heat flow,which degraded device service life ***,we propose a laser-assisted bonding approach to join ceramic to metal directly without any intermediate *** focusing the laser on the surface of β-Si_(3)N_(4) ceramic,the Si microcrystalline layer with stacked α-Si_(3)N_(4) nanocrystals was prepared *** face-centered cubic(fcc)Si and hexagonal close-packed(hcp)β-Si_(3)N_(4) substrate take the coherent orientation relations of[001]_(fcc)║[0001]_(hcp) and(220)_(fcc)║(10■0)_(hcp).Then,the defect-free Si_(3)N_(4)/Cu bonded interface obtained by the reaction of the formed Si and Cu at elevated temperature in the 805-900℃range for 30 min demonstrated a strong and stable joining of ceramic to *** introduction of the laser provides a novel approach to join ceramics to metals,and the ceramic/metal component is expected to be a new configuration for package substrate in high-power device applications.

关键词： Laser-assisted direct bonding Silicon nitride Laser irradiation Thermal decomposition Ceramic/metal heterointerfaces

Wettability and joining of SiC by Sn-Ti: Microstructure and mechanical properties

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Journal of Materials Science & Technology 2020年第5期40卷 15-23页

作者： Wei Fu xiaoguo song Ruichen Tian Yuzhen Lei Weimin Long Sujuan Zhong Jicai Feng State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai 264209China State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical EngineeringZhengzhou 450001China

Reliable Si C/Sn-Ti/Si C joints were obtained by brazing(950?C/10 min)and soldering(250?C/2 min)following premetallization depend on the wettability of Sn-Ti on Si *** microstructures of Sn-Ti/Si C interface were characterized by scanning electron microscopy,X-ray diffraction and transmission electron microscopy,and the mechanical properties of joints were evaluated by shear *** Ti enhanced the wettability of Sn on Si C with the decrease of contact angle from 150?to 20?.Ti direct reacted with Si C to produce Ti C and combines with released Si forming *** lower Ti concentration per contacting area in brazing and metallization,compared to wetting,resulted in defective bonding of Sn-Ti/Si C and few amounts of interfacial products(thin Ti C layer or partial covered Ti C layer with Ti5Si3).All of the Si C/Si C joints possess a similar shear strength of 27–32 MPa and rupture through?-Sn matrix in ductile fracture.

关键词： Microstructures Wettability Brazing Metallization SiC Sn Ti