Reactive air brazing for sealing mixed ionic electronic conducting hollow fibre membranes

Chen, Hong; Li, Leijun; Kemps, Raymond; Michielsen, Bart; Jacobs, Marijke; Snijkers, Frans; Middelkoop, Vesna

doi:10.1016/j.actamat.2015.01.029

Cited by 49 publications

(20 citation statements)

References 15 publications

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“…The main characteristic of this technique is, as included in the work performed by Chen et al [243], its capability to enhance the oxygen permeation when an insufficiently high oxygen conductivity membrane is used (see Figure 16). Different Ag-based material compositions coupled with various sintering treatments (performed in different atmospheres) were reported to be successful [244][245][246][247]. The second sealing technique is an electronic conductive sealing, which typically uses a silver alloy and aims to braze the membrane to a metallic tube.…”

Section: High Temperature Sealingmentioning

confidence: 99%

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

et al. 2019

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Mixed ionic-electronic conducting membranes have seen significant progress over the last 25 years as efficient ways to obtain oxygen separation from air and for their integration in chemical production systems where pure oxygen in small amounts is needed. Perovskite materials are the most employed materials for membrane preparation. However, they have poor phase stability and are prone to poisoning when subjected to CO2 and SO2, which limits their industrial application. To solve this, the so-called dual-phase membranes are attracting greater attention. In this review, recent advances on self-supported and supported oxygen membranes and factors that affect the oxygen permeation and membrane stability are presented. Possible ways for further improvements that can be pursued to increase the oxygen permeation rate are also indicated. Lastly, an overview of the most relevant examples of membrane reactors in which oxygen membranes have been integrated are provided.

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Section: High Temperature Sealingmentioning

confidence: 99%

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

et al. 2019

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“…Therefore, in the past 20 years, a new ceramic-ceramic and ceramic-metal joining technique publicized as reactive air brazing (RAB) has been explored exceedingly for high-temperature applications [2,3,[22][23][24][25][26]. In numerous points, RAB is alike to active metal brazing process [9,13].…”

Section: Introductionmentioning

confidence: 99%

“…The bonding strength depends on the copper oxide content and the formed reaction layers at the different material interfaces [2,23,27]. Chen et al [26] analyzed the wetting mechanisms of some common ceramic-metal compounds by RAB using Ag-Cu brazing alloys. The authors have shown that the produced joints are hermitic and stable to thermal aging (750-950 °C).…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of reactive air brazed (RAB) Crofer 22 APU-Al2O3 joints at ambient temperature

2020

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The evolution of innovative high-temperature electrochemical devices, such as high temperature solid oxide fuel cells (SOFCs), gas separators and gas reformers, consisting of metal-ceramic-joints is challenging. The seals have to be stable and gastight in isothermal high-temperature as well as in thermo-cyclic operation. Here, the reduction of porosity is the primary aim, to obtain air brazed joints with a long lifetime. In the last years, reactive air brazing (RAB) has gained rising interest for the joining of ceramic-ceramic and ceramic-metal compounds. In this paper an alternative brazing filler metal manufacturing process employing (physical vapor deposition (PVD)) is applied and its feasibility for the production of metal-ceramic composites has been investigated for Ag-4 wt%CuO. For RAB aluminum oxide with ferritic high chromium steel Crofer22APU have been joined. The pore formation in subordination of the braze and base materials can be monitored after brazing. By modifying the brazing process, the pore formation in the joints can be avoided. The microstructure of brazed joints with the developed braze foils is studied. Discussion of the results focuses on the influence of microstructural evolution on mechanical properties, the pore formation in the brazing seam and failure behavior of the brazed joints. A correlation between the process parameters brazing temperature and holding time and the achieved compound properties could be derived. Further, excellent wetting of the ceramic was obtained. The highest shear strength with 123 MPa was measured for a temperature of 1000 °C and 5 min, using the Ag4CuO alloy.

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“…Earlier studies reported the effectiveness of RAB for joining a variety of ceramics and metal alloys using Ag-CuO fillers. [1][2][3][4][5][6][7][8][9][10] The Ag-CuO phase diagram has eutectic and monotectic points at 932 and 964°C, respectively. 2) Hence, RAB is generally performed for several minutes at temperatures higher than the melting temperature of the Ag-CuO filler.…”

Section: Introductionmentioning

confidence: 99%

“…5,[11][12][13][14] Different researchers have used different brazing protocols for joining various materials. 6,[15][16][17][18][19][20] For instance, LSCF/FeCrAlloy and BCFZ/FeCrAlloy joints were brazed at temperatures of 1020-1100°C for 30 to 180 minutes by Chen et al 6) BSCF/AISI 314 joints were successfully brazed for 20 minutes at a brazing temperature of 955°C. 15) YSZ/AISI 314 and BSCF/Crofer 22 H joints were brazed at 970°C for 20 minutes using Ag3Cu filler.…”

Section: Introductionmentioning

confidence: 99%

Effects of Reactive Air Brazing Parameters on the Interfacial Microstructure and Shear Strength of GDC–LSM/Crofer 22 APU Joints

Raju¹,

Kim²,

Seong³

et al. 2019

J. Korean Ceram. Soc

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In this paper, the joining characteristics of GDC-LSM ceramics with Crofer 22 APU metal alloys was investigated at different brazing temperatures and holding times by reactive air brazing. Brazing was performed using Ag-10 wt% CuO filler, at three different temperatures (1000, 1050, and 1100°C for 30 minutes) as well as for three different holding times (10, 30, and 60 minutes at 1050°C). The interfacial microstructures were examined by scanning electron microscopy and the joining strengths were assessed by measuring shear strengths at room temperature. The results show that with increasing brazing temperature and holding time, joint microstructure changed obviously and shear strength was decreased. Shear strength varied from a maximum of 100±6 MPa to a minimum of 18±5 MPa, depending on the brazing conditions. These changes were attributed to an increase in the thickness of the oxide layer at the filler/metal alloy interface.

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Reactive air brazing for sealing mixed ionic electronic conducting hollow fibre membranes

Cited by 49 publications

References 15 publications

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

Mechanical behavior of reactive air brazed (RAB) Crofer 22 APU-Al2O3 joints at ambient temperature

Effects of Reactive Air Brazing Parameters on the Interfacial Microstructure and Shear Strength of GDC–LSM/Crofer 22 APU Joints

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