Air Brazing: A New Method of Ceramic–Ceramic and Ceramic–Metal Joining

Weil, K. Scott; Darsell, Jens T.; Kim, J. Y.

doi:10.1002/9781118056776.ch4

Cited by 8 publications

(2 citation statements)

References 92 publications

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“…The contact / wetting angles of silver (10) and nickel (11) on YSZ have been reported as 90 and 117°, respectively, which can also be deduced from the scanning electron micrographs in Figure 4. Thus, the silver paste will have caused more blocked surface pores (shown schematically in Figure 5), impeding gas transfer in and out of the electrode and so increased the electrode polarization.…”

Section: Effect Of Current Collector Design On Electrode Polarization...mentioning

confidence: 57%

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO₂

Kleiminger

Kelsall

et al. 2015

ECS Trans.

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Specific surface areas of micro-tubular solid oxide electrolysers (MT-SOEs) increase with the reciprocal of their lumen diameters. However, this benefit over planar counterparts may be offset by difficulties in fabricating effective current collectors for < 1 mm diameter inner electrodes, causing significant potential losses, decreasing their performance. Hence, the effects were investigated of different current collector materials for the inner cathodes of such SOEs for splitting CO2. Ohmic area-specific resistances were lowest for silver wire-based compared to nickel wire-based current collectors, due to silver’s higher electronic conductivity. However, silver’s lower mechanical strength required addition of silver paste for effective connections, but the paste interfered with the electrode process, increasing the area-specific electrode polarization at 1.5 V by > 300% at 700 and 800 °C. Microstructural analysis suggested the silver paste caused partial blockage of surface pores. MT-SOEs with only nickel wire current collectors achieved 1 A cm-2 at 1.5 V.

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Section: Effect Of Current Collector Design On Electrode Polarization...mentioning

confidence: 57%

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO₂

Kleiminger

Kelsall

et al. 2015

ECS Trans.

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“…Suitable metallic joining partners show a similar thermal expansion to the ceramic OTM. Examples include ferritic steels such as Kanthal [ 35 ], Crofer APU or H [ 36 ], AISI 430 [ 37 ], AISI 446 [ 38 ], austenitic heat-resistant steels such as AISI 310S [ 33 ], AISI 314 [ 39 ], and nickel-base alloys such as alloy 602 CA [ 40 ], Haynes 214 [ 35 ], or Inconel 600 [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

Diffusion Barriers Minimizing the Strength Degradation of Reactive Air Brazed Ba0.5Sr0.5Co0.8Fe0.2O3-δ Membranes during Aging

2023

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The separation of oxygen from air by means of inorganic ceramic membranes requires gas-tight ceramic–metal joints that enable reliable permeation operation in the oxygen partial pressure gradient at 850 °C. Reactive air brazing is a promising method to solve this challenge. However, reactive air brazed BSCF membranes suffer from a significant strength degradation that is caused by unhindered diffusion from the metal component during aging. In this study, we investigated how diffusion layers applied on the austenitic steel AISI 314 influence the bending strength of BSCF-Ag3CuO-AISI314 joints after aging. Three different approaches were compared as diffusion barriers: (1) aluminizing via pack cementation, (2) spray coating with NiCoCrAlReY, and (3) spray coating with NiCoCrAlReY and an additional 7YSZ top layer. Coated steel components were brazed to bending bars and aged for 1000 h at 850 °C in air prior to four-point bending and subsequent macroscopic as well microscopic analyses. In particular, coating with NiCoCrAlReY showed low-defect microstructures. The characteristic joint strength was raised from 17 MPa to 35 MPa after 1000 h aging at 850 °C. In addition, the dominant delamination fracture between the steel and the mixed oxide layer, observed in the reference series with uncoated steel, could be replaced by mixed and ceramic fractures of higher strength. The effect of residual joint stresses on the crack formation and path is analyzed and discussed. Chromium poisoning could no longer be detected in the BSCF, and interdiffusion through the braze was effectively reduced. Since the strength degradation of reactive air brazed joints is mainly caused by the metallic joining partner, the findings on the effect of the diffusion barriers in BSCF joints might be transferred to numerous other joining systems.

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Sealing Technology for Solid Oxide Fuel Cells

Weil

2012

Fuel Cell Science and Engineering

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Air Brazing: A New Method of Ceramic–Ceramic and Ceramic–Metal Joining

Cited by 8 publications

References 92 publications

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO₂

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO₂

Diffusion Barriers Minimizing the Strength Degradation of Reactive Air Brazed Ba0.5Sr0.5Co0.8Fe0.2O3-δ Membranes during Aging

Sealing Technology for Solid Oxide Fuel Cells

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Air Brazing: A New Method of Ceramic–Ceramic and Ceramic–Metal Joining

Cited by 8 publications

References 92 publications

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO2

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO2

Diffusion Barriers Minimizing the Strength Degradation of Reactive Air Brazed Ba0.5Sr0.5Co0.8Fe0.2O3-δ Membranes during Aging

Sealing Technology for Solid Oxide Fuel Cells

Contact Info

Product

Resources

About

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO₂

Effects of Current Collector Materials on Performances of Micro-Tubular Solid Oxide Electrolysers for Splitting CO₂