Induction brazing for gas sealing of anode-supported tubular solid oxide fuel cells using the nickel based brazing alloy modified by TiH2

Chung, Dong-You; Heo, Yeon-Hyuk; Lee, Seung-Bok; Lim, Tak‐Hyoung; Song, Rak‐Hyun; Shin, Dong-Ryul

doi:10.1016/j.ijhydene.2010.01.087

Cited by 11 publications

(3 citation statements)

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“…Cathode materials; LSM and LSCF, were prepared by solid-state powder reaction for which the materials were first weighted in the desired proportions and then mixed in ethanol using ball milling for ten days. The cathode paste was screen printed onto the electrolyte sintered FT anode support and then sintering was done at 1000°C for 5 h. Each FT-SOFC was attached with a metallic cap using an induction brazing process for the fuel flow [135,136]. The two brazed FT-SOFCs were connected in parallel and named as a unit bundle of the stack as shown in Figure 6(b).…”

Section: Ft-sofc Stack Designs and Fabricationmentioning

confidence: 99%

Flat-tubular solid oxide fuel cells and stacks: a review

Khan

Iltaf

Ishfaq

et al. 2021

Journal of Asian Ceramic Societies

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Solid oxide fuel cells (SOFCs) offer numerous advantages in terms of high efficiency and clean electrochemcial energy conversion devices. However, owing to high operation temperature, this technology is restricted to stationary applications and leads to components degradation and long-term stability issues. The development of new design and their modifications for improving the electrochemical performance at intermediate temperatures and durability of the SOFC components are very important to bring this technology one step closer to the market. In this context, the current research on the development, properties, performance, and stability of geometrically modified flat-tubular (FT) SOFC cell and the stack is reviewed in detail. This advanced design exhibits higher performance compared to the tubular type and longer stability in comparison to the planar type SOFCs. The application of the interconnect material is emerging as the key factor influencing the electrical output of the FT-SOFC and operation at high temperatures and current density are the critical issues for cell durability. New stack designs are discussed in detail and experimental findings are summarized.

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Section: Ft-sofc Stack Designs and Fabricationmentioning

confidence: 99%

Flat-tubular solid oxide fuel cells and stacks: a review

Khan

Iltaf

Ishfaq

et al. 2021

Journal of Asian Ceramic Societies

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“…Metallurgical reactions will proceed until interfacial bonds are formed after solidification. There are many alloy systems used as brazing fillers, including Au-based alloys [15][16][17], Ag-based alloys [18][19][20][21][22], Ni-based alloys [23][24][25], etc.…”

Section: Introductionmentioning

confidence: 99%

“…There are also many studies related to the utilization of non-active fillers for brazing ceramics and metal components; to achieve the same effects as those of active fillers, adding reactive reagents (e.g., TiH 2 ) into non-active fillers [25,[38][39][40], or modifying the surface characteristic of ceramics via a metallization process [41][42][43], is usually employed before brazing.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Gas-Tight Properties of Yttria-Stabilized Zirconia/Crofer 22H Stainless Steel Brazed Joints with the Ag-Ge-Si Filler for Use in Solid-Oxide Fuel Cells

Huang,

Shiue,

Liu

2023

Metals

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In this paper, a novel 95Ag-2.5Ge-2.5Si (in wt %) filler is utilized for brazing yttria-stabilized zirconia (YSZ) electrolytes and commercial Crofer 22H interconnects for solid-oxide fuel cells’ (SOFCs) sealing application. Before brazing, surface metallization is applied on YSZ and Crofer 22H substrates to improve the wetting performance of the filler on YSZ and Crofer 22H substrates. The brazing procedure is performed at 900 °C for 10 min under a high vacuum (~10−6 torr) to prepare sandwiched YSZ/Crofer 22H brazed coupons. The metallization mentioned above can achieve reactive wetting toward YSZ ceramics. A Si/Ti-rich oxide layer and an Fe-Cr-Si alloying phase are formed at the brazed joints’ YSZ/filler and filler/Crofer 22H interfaces. After exposure to air at 750 °C for 100 h, Cu and Si contents suffer from oxidation and form CuO and SiO2, respectively, in the brazed zone and the YSZ/filler interface of the joints. The Fe-Cr-Si alloying phase at the filler/Crofer 22H interface is preserved without apparent oxidation. The pressure-drop test results show that the brazed joints’ gas tightness does not deteriorate significantly after thermal aging, which is attributed to the good interfacial integrity of thermal-aged joints.

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