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Effect of Intermediate Ni Layer on Glass-Stainless Steel Seal at Solid Oxide Fuel Cell

Fakouri Hassanabadi, Masoud | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44982 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kokabi, Amir Hossein; Nemati, Ali
  7. Abstract:
  8. In order to prevent deterioration of metallic interconnects in solid oxide fuel cells (SOFC), while interacting with glass-ceramic sealant, a nickel electroplated ferritic stainless steel (UNS 430) was used. After applying a layer of powdered glass (SiO2-B2O3-Al2O3-Na2O-BaO-K2O) with thickness around 300-450 μm on the ferritic stainless steel sheets with dimansion of 0.5 × 60 × 60 mm and 0.5 × 10 × 10 mm, samples were heated at temperatures between 770-850 °C and durations of 1 to 15 hours. To evaluate the effect of the Ni layer, two types of sample (only sanded and only electropolished) were also submitted to the same process, and their results were compared with the coated samples. XRF, ICP, FTIR, DSC, DTA and DIL tests were conducted on glass to elucidate the results. XRD and SEM/EDS and optical microscopy were taken to analyze the thermal stability of seal. To evaluate bond strength, impact test (based on BS EN 10209) and tension test (perpendicular to the glass-steel interface) was carried out. In order to quantify the results of impact tests and bubble structure analyses, the image processing by software ImageJ was used. The results show that Ni layer significantly reduced the internal oxidation in triple boundary of glass/steel /atmosphere. Although this coat induce reduction of bubbles in the glass, reduction of interdiffusion between glass and stainless steel elements, and increasing the adherence for a while, but can backfire in the long time
  9. Keywords:
  10. Thermal Stability ; Nickel Coating ; Sealing Glass ; Solid Oxide Fuel Cell (SOFC)

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