Brazing C/C composites to DD3 alloy with a novel Ag–Cr active braze

Guo, Xiang; Si, Xiaoqing; Li, Chun; Zhao, Shuhui; Yang, Bo; Qi, Junlei; Cao, Jian

doi:10.1016/j.ceramint.2022.02.038

Cited by 28 publications

(5 citation statements)

References 46 publications

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“…Generally, Cr containing brazes can always well wet the graphite due to the reaction between Cr and C to form carbides during the brazing process. However, the wetting behavior of braze in our case is non-reactive wetting, which is distinctive to that of Cr containing brazes on graphite [14], naming typical reactive wetting.…”

Section: Wetting Behaviormentioning

confidence: 54%

“…The primary issue is the poor wettability of brazes on the C/C composites. Active elements (such as Ti and Cr) have been added to braze alloy with the purpose to improve the wettability of the brazes on the carbon substrate [11][12][13][14][15][16]. Currently active brazing alloy including Ag-Cu-Ti, Cu-Ti and Ni-Ti have been most frequently used to braze C/C composites to metals.…”

Section: Introductionmentioning

confidence: 99%

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Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

Shen,

Li,

Sheng

et al. 2024

Preprint

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In this paper, brazing of high reliability C/C composites-metal joint for high temperature application was studied. The surface of C/C composites was modified by Cr metallization process and then brazed to Ni-based superalloy by AgPd braze. Alumina block was used as interlayer and a zig-zag interfacial structure was constructed at the composites/braze interface. The results show that, after the metallization process, a strong adhesion reaction layer consisting of Cr carbides was coated on the C/C surface which in turn obviously improved the wettability of braze. The molted braze filled completely into the laser machined holes in C/C substate and well-bonded interfaces and homogeneous Ag(Pd) solution microstructure was obtained in the joint. The strength of joint with C/C metallized at 1100℃ is higher than that of joint with 1300℃. The joints exhibit very high bending strength up to 82 MPa and shear strength up to 54 MPa, respectively. The braze spikes increase the connection area and provide strong pinning effect.

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Section: Wetting Behaviormentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

Shen,

Li,

Sheng

et al. 2024

Preprint

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“…12 However, there is a large residual stress in the C/C-metals brazed joints due to the large coefficient of thermal expansion (CTE) mismatches between C/C composites and metals, which will damage the mechanical properties of joints and even directly lead to joint failure. 13,14 In order to relieve the residual stress in the joints of heterogeneous materials, composite brazing by introducing reinforcements with low CTE and high-temperature resistance into the joining layer was developed. 15 In the reported composite brazing, there are mainly two methods to introduce reinforcements into the joining layer: one is to directly add the reinforcements, such as SiC particles, 16 Carbon, Nano-Al 2 O 3 , 17 and W particles, 18 into the powder fillers before brazing; the other is to synthesize reinforcements, such as TiB, 19 TiC 20 and AgTi compounds, 21 through in-situ reactions between powder fillers during brazing.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, brazing is the most suitable joining method because of its simplicity, convenience, and low cost 12 . However, there is a large residual stress in the C/C‐metals brazed joints due to the large coefficient of thermal expansion (CTE) mismatches between C/C composites and metals, which will damage the mechanical properties of joints and even directly lead to joint failure 13,14 . In order to relieve the residual stress in the joints of heterogeneous materials, composite brazing by introducing reinforcements with low CTE and high‐temperature resistance into the joining layer was developed 15 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and stress relief mechanism of C/C composite and GH3044 superalloy joints using (Cu)+Ti₅Si₃ foil filler

Wang,

Zhang,

Yin

2023

Int J Applied Ceramic Tech

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A Ti5Si3 reinforced (Cu) matrix foil composite filler was prepared and applied to join C/C composite and GH3044 superalloy, and a finite element model with random distribution particles was constructed to reveal the stress relief mechanism of composite brazing. Results showed the in‐situ synthesized Ti5Si3 reinforcements with a size of less than 5 µm were distributed uniformly in the (Cu) matrix, and their volume fraction reached 38%. The shear strength of the joint brazed with the composite filler reached 37.6 MPa, which is about 100% higher than that brazed with (Cu) filler. The Ti5Si3 reinforcements relieved the residual stress mainly by reducing residual stress values, introducing compressive stress into the joining layer, and transforming the continuous tensile stress into tensile stress/compressive stress.

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“…As shown in Figure4B, Shen Yuanxun et al[68] concluded that the Al 2 O 3 interlayer can effectively prevent the diffusion and reaction of Ni and Ti and reduce the residual stresses in the joints. Guo et al[69] have reported the brazing of C/C composites and the DD3 alloy using the…”

mentioning

confidence: 99%

Carbon–Carbon Composite Metallic Alloy Joints and Corresponding Nanoscale Interfaces, a Short Review: Challenges, Strategies, and Prospects

Wang,

Yang,

Zeng

et al. 2023

Crystals

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Brazing of carbon–carbon (C/C) composites with metallic materials currently faces a series of difficulties, such as the poor wettability of metallic materials on the surface, the nanoscale interface bonding of C/C composites and metallic materials, thermal stress problems for these different materials, etc. Especially, the practical problems, including the low joint strength and insufficient reliability, still limit the large-scale practical application of brazing technology for C/C composites and metal materials. Herein, in order to guide the fabrication of high-quality joints, we present a brief discussion on the latest research progress in the joints of C/C composites and metallic materials, including current challenges, solution methods, mechanisms, and future prospects. More importantly, the nanoscale interface in the carbon–carbon composites and metallic alloys is paid very little attention, which has been critically discussed for the first time. Then, we further outline the possible solutions in joint problems of C/C composites and metallic materials, proposing feasible strategies to control the reaction in the brazing process, such as surface treatments, the addition of reinforcing phases, a transition layer sandwiched between the base material and the intermediate layer, etc. These strategies are being envisioned for the first time and further contribute to promoting the converged applications of C/C composites and metallic materials.

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Brazing C/C composites to DD3 alloy with a novel Ag–Cr active braze

Cited by 28 publications

References 46 publications

Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

Microstructure and stress relief mechanism of C/C composite and GH3044 superalloy joints using (Cu)+Ti₅Si₃ foil filler

Carbon–Carbon Composite Metallic Alloy Joints and Corresponding Nanoscale Interfaces, a Short Review: Challenges, Strategies, and Prospects

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Brazing C/C composites to DD3 alloy with a novel Ag–Cr active braze

Cited by 28 publications

References 46 publications

Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

Brazing of surface modified C/C composites to Ni-based superalloy for high temperature applications

Microstructure and stress relief mechanism of C/C composite and GH3044 superalloy joints using (Cu)+Ti5Si3 foil filler

Carbon–Carbon Composite Metallic Alloy Joints and Corresponding Nanoscale Interfaces, a Short Review: Challenges, Strategies, and Prospects

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Microstructure and stress relief mechanism of C/C composite and GH3044 superalloy joints using (Cu)+Ti₅Si₃ foil filler