Oxidation behavior of AgCuTi brazing alloys

Lee, D.B; Woo, Je-Yong; Park, S.W

doi:10.1016/s0921-5093(99)00125-2

Cited by 35 publications

(11 citation statements)

References 12 publications

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“…An application has been identified in which Al 2 O 3 is joined to a iron-nickel-cobalt alloy with the composition Fe-29Ni-17Co wt.%, also known as Kovar been studied in some detail recently [8]. In terms of temperature capability Ag-Cu-Tibased ABAs are not recommended for use above 600 °C because of creep and oxidation of the ABA [9]. In order to increase the maximum operating temperature of a .75V wt.%).…”

Section: Introductionmentioning

confidence: 99%

Active metal brazing of Al₂O₃ to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

Ali

Knowles

Mallinson

et al. 2017

Philosophical Magazine

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The application of an active braze alloy (ABA) known as Copper ABA ® (Cu-3.0Si-2.3Ti-2.0Al wt.%) to join Al 2 O 3 to Kovar ® (Fe-29Ni-17Co wt.%) has been investigated. This ABA was selected to increase the operating temperature of the joint beyond the capabilities of typically used ABAs such as Ag-Cu-Ti-based alloys. Silica present as a secondary phase in the Al 2 O 3 at a level of ~5 wt.% enabled the ceramic component to bond to the ABA chemically by forming a layer of Si 3 Ti 5 at the ABA/Al 2 O 3 interface. Appropriate brazing conditions to preserve a near-continuous Si 3 Ti 5 layer on the Al 2 O 3 and a continuous Fe 3 Si layer on the Kovar ® were found to be a brazing time of ≤15 min at 1025 °C or ≤2 min at 1050 °C. These conditions produced joints that did not break on handling and could be prepared easily for microscopy. Brazing for longer periods of time, up to 45 min, at these temperatures broke down the Si 3 Ti 5 layer on the Al 2 O 3 , while brazing at ≥1075 °C for 2-45 min broke down the Fe 3 Si layer on the Kovar ® significantly. Further complications of brazing at ≥1075 °C included leakage of the ABA out of the joint and the formation of a new brittle silicide, Ni 16 Si 7 Ti 6 , at the ABA/Al 2 O 3 interface. This investigation demonstrates that it is not straightforward to join Al 2 O 3 to Kovar ® using Copper ABA ® , partly because the ranges of suitable values for the brazing temperature and time are quite limited. Other approaches to increase the operating temperature of the joint are discussed.

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Section: Introductionmentioning

confidence: 99%

Active metal brazing of Al₂O₃ to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

Ali

Knowles

Mallinson

et al. 2017

Philosophical Magazine

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“…6 However, the low melting points and poor oxidation resistance of active fillers severely limit the working temperature of the joints. 7 For instance, the maximum working temperature of the most commonly used Ag-Cu-Ti fillers is below 600 • C. 8,9 Diffusion bonding is achieved by inducing atomic diffusion and/or chemical reactions between the parent materials, and it is an attractive technique for preparing ceramic-metal joints for high-temperature applications. However, diffusion bonding typically involves an elevated bonding temperature and a long bonding time.…”

Section: Introductionmentioning

confidence: 99%

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Shen

2022

J Am Ceram Soc.

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A direct current (DC)‐driven transient liquid phase bonding strategy was proposed for joining 3 mol% Y2O3‐stabilized ZrO2 (3YSZ) and GH3128 superalloy with a Ni interlayer. The DC application triggered the rapid formation and diffusion of metallic Zr in 3YSZ and chemical reactions at the 3YSZ/Ni interface. The formed Ni–Zr eutectic liquid well wetted 3YSZ and hence completely filled the bonding gap in seconds. Eutectic structures in the joints were eventually transformed into Ni–Zr intermetallic compounds or a Ni‐based solid solution. The remaining Ni interlayer effectively alleviated residual stress through plastic deformation during cooling stage, and thereby contributed substantially to the high joint strength. Under the joining conditions of a current density of 30 mA/mm2, an energization time of 30 s, and a joining temperature of 1100°C, the obtained joints exhibited a maximum shear strength of 188 ± 8 MPa. This paper proposes an economical and reliable method for the rapid preparation of YSZ/metal joints for high‐temperature applications.

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“…Ag-based fillers such as Ag-Cu and Ag-Cu-Ti [14][15][16][17] as well as Ti-based fillers often containing Cu, Ni and Zr [18][19][20][21] are most commonly used for vacuum brazing of TiAl. However, the commonly used brazing fillers are vulnerable to oxidation when the temperature is above 500 • C, leading to limited high temperature properties and long-term oxidation resistance of the brazed joints [22,23]. Moreover, vacuum equipment is required during brazing procedure to avoid the oxidation of the filler metal, which makes the costs of the method high and limits wider application.…”

Section: Introductionmentioning

confidence: 99%

Reactive Air Brazing of TiAl Alloy Using Ag-CuO: Microstructure and Joint Properties

Yang

et al. 2021

Crystals

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TiAl alloy was successfully brazed with Ag-CuO filler in air atmosphere under simple technical conditions. The wettability of a series of Ag-CuO fillers on TiAl was analyzed. Ag-2mol%CuO filler possessed good wetting behavior on TiAl alloy. The microstructure and mechanical properties of the brazed joints were investigated. Oxide layers can be found on both sides, which can be divided into external TiO2-rich layer and internal Al2O3-rich layer. The maximum shear strength of the joint was obtained at 1020 °C holding for 20 min.

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Oxidation behavior of AgCuTi brazing alloys

Cited by 35 publications

References 12 publications

Active metal brazing of Al₂O₃ to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

Active metal brazing of Al₂O₃ to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Reactive Air Brazing of TiAl Alloy Using Ag-CuO: Microstructure and Joint Properties

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Oxidation behavior of AgCuTi brazing alloys

Cited by 35 publications

References 12 publications

Active metal brazing of Al2O3 to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

Active metal brazing of Al2O3 to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

DC‐driven ultrafast transient liquid phase bonding of 3YSZ and GH3128 superalloy using Ni interlayer

Reactive Air Brazing of TiAl Alloy Using Ag-CuO: Microstructure and Joint Properties

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Active metal brazing of Al₂O₃ to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)

Active metal brazing of Al₂O₃ to Kovar® (Fe–29Ni–17Co wt.%) using Copper ABA® (Cu–3.0Si–2.3Ti–2.0Al wt.%)