Joining Alumina to Titanium Alloys Using Ag-Cu Sputter-Coated Ti Brazing Filler

Emadinia, Omid; Guedes, A.; Tavares, C. J.; Simões, Sónia

doi:10.3390/ma13214802

Cited by 10 publications

(14 citation statements)

References 37 publications

(61 reference statements)

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“…Several technologies have been applied to join dissimilar materials [1]. However, the most reported metal to ceramic joining processes are brazing [8][9][10][11][12] and solid-state diffusion bonding [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Brazing allows successful joints to be obtained between metallic and ceramic base materials as it does not involve melting the base materials, thus reducing the formation of residual stresses [1,2,[8][9][10][11][12]. Nevertheless, the most reported brazing alloys in the literature for brazing Al 2 O 3 to Ti6Al4V are Ag-based alloys which, despite requiring a low processing temperature, promote the formation of (Ag), which compromises the service temperature of the joints [1].…”

Section: Introductionmentioning

confidence: 99%

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Joining of Ti6Al4V to Al2O3 Using Nanomultilayers

et al. 2022

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Diffusion bonding of Ti6Al4V to Al2O3 using Ni/Ti reactive nanomultilayers as interlayer material was investigated. For this purpose, Ni/Ti multilayer thin films with 12, 25, and 60 nm modulation periods (bilayer thickness) were deposited by d.c. magnetron sputtering onto the base materials’ surface. The joints were processed at 750 and 800 °C with a dwell time of 60 min and under a pressure of 5 MPa. Microstructural characterization of the interfaces was conducted by scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). The mechanical characterization of the joints was performed by nanoindentation, and hardness and reduced Young’s modulus distribution maps were obtained across the interfaces. The joints processed at 800 °C using the three modulation periods were successful, showing the feasibility of using these nanolayered films to improve the diffusion bonding of dissimilar materials. Using modulation periods of 25 and 60 nm, it was also possible to reduce the bonding temperature to 750 °C and obtain a sound interface. The interfaces are mainly composed of NiTi and NiTi2 phases. The nanoindentation experiments revealed that the hardness and reduced Young’s modulus at the interfaces reflect the observed microstructure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Joining of Ti6Al4V to Al2O3 Using Nanomultilayers

et al. 2022

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“…The most reported technologies in the literature with regards to joining dissimilar materials are brazing and solid-state diffusion bonding [15][16][17]. Brazing [18][19][20][21][22][23][24][25][26][27][28] is an attractive process that consists of adding a filler metal between the base materials. Ag-based commercial alloys can be used successfully as brazing alloys since they improve the reaction between metal and ceramic and enhance wetting [29].…”

Section: Introductionmentioning

confidence: 99%

Joining Ti6Al4V to Alumina by Diffusion Bonding Using Titanium Interlayers

Silva

Ramos

Simões

2021

Metals

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This work aims to investigate the joining of Ti6Al4V alloy to alumina by diffusion bonding using titanium interlayers: thin films (1 µm) and commercial titanium foils (5 µm). The Ti thin films were deposited by magnetron sputtering onto alumina. The joints were processed at 900, 950, and 1000 °C, dwell time of 10 and 60 min, under contact pressure. Experiments without interlayer were performed for comparison purposes. Microstructural characterization of the interfaces was conducted by optical microscopy (OM), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD). The mechanical characterization of the joints was performed by nanoindentation to obtain hardness and reduced Young’s modulus distribution maps and shear strength tests. Joints processed without interlayer have only been achieved at 1000 °C. Conversely, joints processed using Ti thin films as interlayer showed promising results at temperatures of 950 °C for 60 min and 1000 °C for 10 and 60 min, under low pressure. The Ti adhesion to the alumina is a critical aspect of the diffusion bonding process and the joints produced with Ti freestanding foils were unsuccessful. The nanoindentation results revealed that the interfaces show hardness and reduced Young modulus, which reflect the observed microstructure. The average shear strength values are similar for all joints tested (52 ± 14 MPa for the joint processed without interlayer and 49 ± 25 MPa for the joint processed with interlayer), which confirms that the use of the Ti thin film improves the diffusion bonding of the Ti6Al4V alloy to alumina, enabling a decrease in the joining temperature and time.

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“…However, the distortion induced by welding and the geometry limitations of the components may restrict the use of fusionwelding processes [11]. Brazing is the alternative for joining different components of Materials 2021, 14, 5949 2 of 10 titanium and its alloys [14,15]. For the brazing of titanium alloys, Ti-, Ag-and Al-based fillers have been developed for industrial applications [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Brazing of Ti–15Mo–5Zr–3Al and Commercially Pure Titanium Using Ti–Cu–Ni Foil

et al. 2021

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Dissimilar brazing of Ti–15Mo–5Zr–3Al (Ti-1553) to commercially pure titanium (CP-Ti) using Ti–15Cu–15Ni foil was performed in this work. The microstructures in different sites of the brazed joint showed distinct morphologies, which resulted from the distributions of Mo, Cu, and Ni. In the brazed zone adhered to the Ti-1553 substrate, the partitioning of Mo from the Ti-1553 into the molten braze caused the formation of stabilized β-Ti without Ti2Cu/Ti2Ni precipitates. In the CP-Ti side, the brazed joint displayed a predominantly lamellar structure, composed of the elongated primary α-Ti and β-transformed eutectoid. The decrease in the Mo concentration in the brazed zone caused the eutectoid transformation of β-Ti to Ti2Cu + α-Ti in that zone. The diffusion of Cu and Ni from the molten braze into the CP-Ti accounted for the precipitation of Ti2Cu/Ti2Ni in the transformed zone therein. The variation in the shear strength of the joints was related to the amount and distribution of brittle Ti2Ni compounds. Prolonging the brazing time, the wider transformed zone, consisting of coarse elongated CP-Ti interspersed with sparse Ti2Ni precipitates, was responsible for the improved shear strength of the joint.

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Joining Alumina to Titanium Alloys Using Ag-Cu Sputter-Coated Ti Brazing Filler

Cited by 10 publications

References 37 publications

Joining of Ti6Al4V to Al2O3 Using Nanomultilayers

Joining of Ti6Al4V to Al2O3 Using Nanomultilayers

Joining Ti6Al4V to Alumina by Diffusion Bonding Using Titanium Interlayers

Dissimilar Brazing of Ti–15Mo–5Zr–3Al and Commercially Pure Titanium Using Ti–Cu–Ni Foil

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