A Novel Metal Supported SOFC Fabrication Method Developed in KAIST: a Sinter-Joining Method

Bae, Joongmyeon

doi:10.4191/kcers.2016.53.5.478

Cited by 6 publications

(4 citation statements)

References 2 publications

(1 reference statement)

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“…8 (a) and (b) are in-situ pressure curve for thermal aging (at 750 °C for 100 h) and average leak rate curve for thermal cycling (RT-750 °C for 20 cycles) of Crofer22H/Crofer22H brazed coupons, respectively. According to the formula [1], the average leak rate of Crofer22H/Crofer22H joint after aging can be calculated from slope of pressure with time (Figure 8 (a)), which is around 2.8 × 10 -5 mbar.l/s/cm. For thermal cycling, the leak rate is below detection limit at beginning, and increases gradually with more cycles, which is close to 2.0 × 10 -4 mbar.l/s/cm after 20 cycles (Figure 8 (b)).…”

Section: Resultsmentioning

confidence: 99%

“…He gas was purged into brazed coupons beforehand as a medium for leakage detection. With the change of pressure inside the brazed coupons under testing conditions, average leak rate can be calculated according to the definition as depicted in formula [1]. The filling volume of gas and sealing length in this study were set as 10 liters and 6.4 cm, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…V l [1] (L: average leak rate, ΔP/Δt: pressure derivative with time, V: filling volume of gas, l: sealing length)…”

Section: Methodsmentioning

confidence: 99%

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Characterization of Ag-Based Filler for Electrolyte/Metallic-Interconnect Joint in Metal-Supported Solid Oxide Fuel Cells Applications

et al. 2021

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Metal-supported solid oxide fuel cells (MS-SOFCs) exhibit better electrochemical performance than conventional ceramic-supported cells at lower temperature due to their exceptional thermal, electrical, and mechanical properties. MS-SOFCs can withstand rapid thermal cycling operation and make it practical for mobile applications. A reliable seal is essential for electrolyte/metallic interconnect joint in MS-SOFC applications. In the present study, we proposed an Ag-Ge alloy filler as a high-temperature brazing sealant for use in MS-SOFCs. Commercial ferritic stainless steel (Crofer22H) and La1-XSrXGa1-yMgyO3- δ (LSGM) substrate were employed as metallic interconnect and electrolyte for this study, respectively. The adhesive and hermetic characterization for the electrolyte/metallic interconnect joint joined by the Ag-Ge alloy filler were examined by using high-temperature leak test at elevated temperatures. Results showed that the leak rate of LSGM/Crofer22H coupon is 5.0 x 10-4 mbar∙l/s/cm after aging at 750°C for 100 hours in He/air. In addition, SEM/EDS analyses also revealed that Ge element in the Ag-Ge filler is prone to diffuse toward Crofer22H and LSGM side, and thus improves the interfacial adhesion of the LSGM/Crofer22H joint.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Characterization of Ag-Based Filler for Electrolyte/Metallic-Interconnect Joint in Metal-Supported Solid Oxide Fuel Cells Applications

et al. 2021

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“…and ferritic stainless steel-based materials (AISI 441, Crofer22 APU, ITM, etc.) [15][16][17][18][19][20].…”

Section: High-temperature Oxidation Problemmentioning

confidence: 99%

Failure Mechanism and Optimization of Metal-Supported Solid Oxide Fuel Cells

et al. 2023

Materials

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A solid oxide fuel cell (SOFC) is a clean, efficient energy conversion device with wide fuel applicability. Metal-supported solid oxide fuel cells (MS-SOFCs) exhibit better thermal shock resistance, better machinability, and faster startup than traditional SOFCs, making them more suitable for commercial applications, especially in mobile transportation. However, many challenges remain that hinder the development and application of MS-SOFCs. High temperature may accelerate these challenges. In this paper, the existing problems in MS-SOFCs, including high-temperature oxidation, cationic interdiffusion, thermal matching, and electrolyte defects, as well as lower temperature preparation technologies, including the infiltration method, spraying method, and sintering aids method, are summarized from different perspectives, and the improvement strategy of existing material structure optimization and technology integration is put forward.

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