Transient porous nickel interlayers for improved silver-based Solid Oxide Fuel Cell brazes

Zhou, Quan; Bieler, T. R.; Nicholas, Jason D.

doi:10.1016/j.actamat.2018.01.061

Cited by 34 publications

(29 citation statements)

References 36 publications

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“…Most of the Ag ows away from the gap between YSZ and AISI 441, and only a slight residual Ag exists between YSZ and AISI 441. This phenomenon can be attributed to the high contact angle of pure Ag on the YSZ surface and no reaction between YSZ and Ag, resulting in the loss of liquid Ag during joining [34,44].…”

Section: Effect Of Bonding Temperature On Ysz/aisi 441 Jointmentioning

confidence: 99%

“…The oxide layer at the AISI 441 interface remains compact, and its thickness does not seem to change after exposure to reducing atmosphere for 300 h. This may be because the oxide layer is thermodynamically stable under this condition and is di cult to be decomposed by reduction. Notably, the voids caused by the CuO reduction, which is inevitable in the traditional RAB method [4,31,34,37], are completely eliminated.…”

Section: Stability Of Joints In Reducing and Oxidizing Atmospheresmentioning

confidence: 99%

“…The other issue for the Ag-CuO braze is that CuO is thermodynamically unstable when exposed to the reducing atmosphere in fuel (i.e., anode) chambers [7,31]. The decomposition of CuO through the reaction CuO + H →Cu + H 2 O and the subsequent solid solution of Cu into the Ag matrix can lead to many voids [4,34]. Besides, these voids can offer rapid paths for hydrogen permeation into the joint central region (where the hydrogen reacts with diffused oxygen to generate gaseous water pockets), consequently weakening the gas-tightness and mechanical properties of joints [31,[35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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Joining YSZ electrolyte to AISI 441 interconnect for solid oxide cells using the Ag interlayer: Enhanced mechanical and aging properties

Wang

et al. 2021

Preprint

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Conventional Ag-CuO braze can lead to two electrolyte/interconnect joining issues: over-oxidation at the steel interconnect and hydrogen-induced decomposition of CuO. This work demonstrates that a pure Ag interlayer, instead of Ag-CuO braze, can join YSZ electrolyte to AISI 441 interconnect in air. Reliable joining between YSZ and AISI 441 can be realized at 920 °C. A dense and thin oxide layer (~2 μm) is formed at the AISI 441 interface. Also, an interatomic joining at the YSZ/Ag interface is detected by TEM observation. Obtained joints display high shear strengths (~86.1 MPa), 161% higher than that of joints brazed by Ag-CuO braze (~33 MPa). After aging in reducing and oxidizing atmospheres (800 °C/300 h), joints remain tight and dense, indicating a better aging performance. This technique eliminates the CuO-induced issues, which will extend lifetimes for SOFC/SOEC stacks and other ceramic/metal joining applications.

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Section: Effect Of Bonding Temperature On Ysz/aisi 441 Jointmentioning

confidence: 99%

Section: Stability Of Joints In Reducing and Oxidizing Atmospheresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Joining YSZ electrolyte to AISI 441 interconnect for solid oxide cells using the Ag interlayer: Enhanced mechanical and aging properties

Wang

et al. 2021

Preprint

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“…Joining technology, applied in industries as diverse as electronics, aerospace, automotive, and energy, offers a wide range of different techniques, each with particular characteristics, which will determine their suitability for a certain application. Among these, brazing and soldering offer the principal advantage that they are capable of forming a metallurgical joint between widely dissimilar substrate materials (the parts being joined) with minimal modification of those materials [ 1 , 2 , 3 ]. In both brazing and soldering processes, a molten filler metal is used to form a metallurgical bond between two (or more) components (the convention is for the two methods to be distinguished by a watershed of 450 °C).…”

Section: Introductionmentioning

confidence: 99%

High Entropy Alloys as Filler Metals for Joining

Luo

Xiao

Hardwick

et al. 2021

Entropy

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In the search for applications for alloys developed under the philosophy of the High Entropy Alloy (HEA)-type materials, the focus may be placed on applications where current alloys also use multiple components, albeit at lower levels than those found in HEAs. One such area, where alloys with complex compositions are already found, is in filler metals used for joining. In soldering (<450 °C) and brazing (>450 °C), filler metal alloys are taken above their liquidus temperature and used to form a metallic bond between two components, which remain both unmelted and largely unchanged throughout the process. These joining methods are widely used in applications from electronics to aerospace and energy, and filler metals are highly diverse, to allow compatibility with a broad range of base materials (including the capability to join ceramics to metals) and a large range of processing temperatures. Here, we review recent developments in filler metals relevant to High Entropy materials, and argue that such alloys merit further exploration to help overcome a number of current challenges that need to be solved for filler metal-based joining methods.

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“…[23] The thickness and the morphology of the oxide layer on steel influence the mechanical properties of the brazed ceramic-metal component dramatically. [24] New ideas are the usage of an interlayer of porous nickel for promoting the wetting angle of Ag without Cu for brazing YSZ ceramic [25] or the reinforcement with Al 2 O 3 nanoparticles for improving the joint strength. [26] In this study, the RAB as a cost-effective and fast method is investigated for the brazing of Al 2 O 3 ceramic with a filler metal composition based on silver with 4 mol% CuO and 0.5 mol% Ti (Ag4CuO0.5Ti).…”

Section: Introductionmentioning

confidence: 99%

Influence of the Brazing Paste Composition on the Wetting Behavior of Reactive Air Brazed Metal–Ceramic Joints

et al. 2020

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Reactive air brazing (RAB) is a cost‐effective way to produce ceramic–ceramic or ceramic–metal brazed joints in air, without applying a protective gas atmosphere or a vacuum. In addition to conventional furnace technology, the brazing with induction heating can also be used effectively. Within the scope of this study the shrinkage and wetting behavior of self‐developed brazing pastes with different CuO contents and two qualities of silver powders with coarse and fine particle size are investigated by optical dilatometry on alumina (Al2O3, 99.7% purity). Thereby, the fine silver powder quality reveals a significant swelling effect at high temperatures, leading to an expansion of densified powder compacts caused by evolving gases. Joining tests are performed on ceramic–steel brazed joints using a muffle furnace and induction heating for short brazing cycles. The brazing seams and interfaces of the joints are investigated using scanning electron microscopy (SEM) and energy‐dispersive X‐ray spectroscopy (EDS). As a result, correlations between the brazing filler metal composition, the steel, and the brazing conditions are obtained.

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Transient porous nickel interlayers for improved silver-based Solid Oxide Fuel Cell brazes

Cited by 34 publications

References 36 publications

Joining YSZ electrolyte to AISI 441 interconnect for solid oxide cells using the Ag interlayer: Enhanced mechanical and aging properties

Joining YSZ electrolyte to AISI 441 interconnect for solid oxide cells using the Ag interlayer: Enhanced mechanical and aging properties

High Entropy Alloys as Filler Metals for Joining

Influence of the Brazing Paste Composition on the Wetting Behavior of Reactive Air Brazed Metal–Ceramic Joints

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