Effect of graphite content on microstructure and properties of Al2O3 ceramic and 304 stainless steel brazed joints

Xue, Haitao; Li, Tao; Guo, Weibing; Chen, Cuixin; Zhao, Jianglong; Ding, Zhijie

doi:10.1016/j.matlet.2021.131050

Cited by 18 publications

(3 citation statements)

References 7 publications

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“…The joint was composed of Ni 3 Ti + Cu 3 Ti 2 , Ag(s,s)+Cu(s,s), CuTi + Mo, Ti-based solid solution and FeTi + Fe 2 Ti, and the maximum shear strength reached 263 MPa. Xue et al [21] brazed 304 stainless steel and Al 2 O 3 ceramic with AgCuTi. When 0.1 wt-% graphite was added, the microstructure of the joint was Al 2 O 3 /Cu 3 Ti 3 O + TiCu/Ag(s,s)+Cu(s,s)+TiC + TiCu/Cu0.8Fe0.2Ti/Fe-Cr/304 SS, and the joint strength increased from 130.54 to 203.49 MPa.…”

Section: Introductionmentioning

confidence: 99%

Laser welding of ZrO₂ ceramic and 304 stainless steel with Ag–Cu–Ti filler

Guo

Zhang

Lü

et al. 2023

Materials Science and Technology

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In this paper, the joining of ZrO2 ceramic and 304 stainless steel (SS) was realised by laser offset welding with AgCuTi filler metal. The heat was transferred from the molten pool to the solder through the unmelted SS. AgCuTi would diffuse to form eutectic products with low melting point, forming metallurgical reaction zone. The unmelted SS was retained by laser migration to avoid the mixing of molten solder and molten pool, which reduced the content of brittle phase in the joint. In addition, the crack-free welded joint with a tensile strength of 71 MPa was obtained. The elemental diffusion model was used to simulate the interfacial microstructure changes, and the microstructure was reasonably predicted by changing the welding parameters.

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Section: Introductionmentioning

confidence: 99%

Laser welding of ZrO₂ ceramic and 304 stainless steel with Ag–Cu–Ti filler

Guo

Zhang

Lü

et al. 2023

Materials Science and Technology

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“…8 Therefore, effectively relieving the residual stress generated in ceramic-metal joints is challenging. In recent years, some studies have reported that composite filler materials reinforced with low-CTE filler materials, including particles, 9 carbon fibers, 10 and interlayers, 11 can alleviate the mismatch in the thermal expansion coefficient of the joint, improving the joint strength. [12][13][14][15][16] For example, in a study by Song et al 17 , the incorporation of graphene nanoplatelets (GNPs) into an Ag-Cu-Ti composite filler significantly enhanced the joint strength between a SiC ceramic and a GH99 superalloy.…”

Section: Introductionmentioning

confidence: 99%

Releasing the residual stress of Al₂O₃/304 stainless steel joint by introducing BN into Ag‐Cu‐Ti filler metal

Tao,

Haitao,

Xianming

et al. 2023

Int J Applied Ceramic Tech

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Owing to the native character of the coefficient of thermal expansion (CTE) mismatch between Al2O3 and 304 stainless steel, obtaining high strength for Al2O3/304 stainless steel joints remains challenging. In this study, the residual stress of an Al2O3/304 stainless steel brazed joint was relieved using the Ag‐Cu‐Ti + boron nitride (BN) composite filler. The results indicated that the elements between the filler and base metals on both sides were mutually diffused. Moreover, reaction layers formed at the interface, connecting the Al2O3 ceramic and 304 stainless steel. The microstructure of the joint was as follows: Al2O3/Cu3Ti3O + TiCu/Ag (s, s) + Cu (s, s) + TiN + TiB2 + TiCu/Cu0.8Fe0.2Ti/TiFe2/Fe‐Cr/304 stainless steel. When the .1 wt% BN was added, the average strength of the joint reached 151 ± 10 MPa, 15% higher than the average strength of the joint only using Ag‐Cu‐Ti filler (131 ± 9 MPa). The improvement in the shear strength and reduction in the residual stress was attributed to the formation of TiN and TiB2, reducing the CTE difference and refining the microstructure.

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“…In order to improve the thrust-to-weight ratio, the traditional single-web turbine disk was supposed to be substituted by hollow twin-web turbine disks (TWD), which are conducive to weight reduction and cooling efficiency [5][6][7]. The welding techniques were applied to produce the hollow profiles, among which the solid-state diffusion bonding (SSDB) process was considered a prevailing method, since it can avoid the formation of adverse phases in the bonding regions, such as blocky brittle phases or intermetallic compounds, which are inescapable during the transient liquid phase bonding and braze welding [8][9][10]. Due to the microstructure discrepancy between the welding areas and the matrix regions, the welding region was usually the weak zone of the joint and determined the mechanical properties of the TWD.…”

Section: Introductionmentioning

confidence: 99%

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

et al. 2022

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The hollow twin-web disk is designed to improve the thrust-to-weight ratio of the aero engine, where the welding joint microstructures determine the disk’s mechanical properties. This study aimed to elucidate the effect of abnormal grains formed in the welding region on the mechanical properties of FGH96 solid-state diffusion bonding joints. Digital image correlation using images captured by scanning electron microscopy (SEM-DIC) and electron backscattering diffraction (EBSD) technologies were applied. The results show that abnormally large grains (2.5 times that of the matrix), with preferred orientation in the bonding region, were detrimental to the joint mechanical properties. The yield and tensile strengths were 995.85 MPa and 1456.67 MPa, respectively, and the corresponding relative (ratio to the matrix) ones were 92.54% and 88.81%. After modifying the bonding process, the grain size in the bonding region was tailored to close to that of the matrix, and considerable twin boundaries (TBs) formed, leading to the relative tensile and yield strength reaching 98.86% and 99.37%. Furthermore, the failure mode changed to intragranular type from intergranular type. It demonstrates that tailoring the newborn grain size, introducing TBs inside, and eliminating preferred orientation during the welding process can be an efficient way to improve the joint mechanical properties.

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Effect of graphite content on microstructure and properties of Al2O3 ceramic and 304 stainless steel brazed joints

Cited by 18 publications

References 7 publications

Laser welding of ZrO₂ ceramic and 304 stainless steel with Ag–Cu–Ti filler

Laser welding of ZrO₂ ceramic and 304 stainless steel with Ag–Cu–Ti filler

Releasing the residual stress of Al₂O₃/304 stainless steel joint by introducing BN into Ag‐Cu‐Ti filler metal

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

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Effect of graphite content on microstructure and properties of Al2O3 ceramic and 304 stainless steel brazed joints

Cited by 18 publications

References 7 publications

Laser welding of ZrO2 ceramic and 304 stainless steel with Ag–Cu–Ti filler

Laser welding of ZrO2 ceramic and 304 stainless steel with Ag–Cu–Ti filler

Releasing the residual stress of Al2O3/304 stainless steel joint by introducing BN into Ag‐Cu‐Ti filler metal

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

Contact Info

Product

Resources

About

Laser welding of ZrO₂ ceramic and 304 stainless steel with Ag–Cu–Ti filler

Laser welding of ZrO₂ ceramic and 304 stainless steel with Ag–Cu–Ti filler

Releasing the residual stress of Al₂O₃/304 stainless steel joint by introducing BN into Ag‐Cu‐Ti filler metal