Abstract
Two gold‐base active metal brazes (gold‐ABA and gold‐ABA‐V) were evaluated for oxidation resistance to 850°C, and used to join yttria‐stabilized zirconia (YSZ) to a corrosion‐resistant ferritic stainless steel for possible use in solid oxide fuel cells. Thermogravimetric analysis and optical microscopy and scanning electron microscopy coupled with energy‐dispersive spectroscopy were used to evaluate the braze oxidation behavior, and microstructure and composition of the YSZ/braze/steel joints. Both gold‐ABA and gold‐ABA‐V exhibited nearly linear oxidation kinetics at 850°C, with gold‐ABA‐V showing faster oxidation than gold‐ABA. Both brazes produced metallurgically sound YSZ/steel joints due to chemical interactions of Ti and V with the YSZ and steel substrates.
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