Reactive brazing of ceria to an ODS ferritic stainless steel |
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Authors: | T I Khan A Al-Badri |
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Affiliation: | (1) Department of Mechanical and Manufacturing Engineering, University of Calgary, 2500 University Drive, Calgary, Alberta, Canada |
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Abstract: | This research study shows that a ceria ceramic can be bonded to an ODS ferritic stainless steel (MA956) by reactive brazing using a Ag68-Cu27.5-Ti4.5 interlayer. The ability to join these materials provides an alternative to the current ceramic interconnects used in the development of solid oxide fuel cells. Initial results show that the ceramic-metal bonds survived the bonding process irrespective of the degree of porosity within the ceria ceramic. Metallographic analyses indicate that a reaction zone formed along the ceria/braze interface, which was not only titanium rich, but also consisted of a mixture of copper oxides. When the ceramic-metal bonds were exposed to high bonding temperatures or when subjected to thermal cycling at 700°C, this reaction layer increased in thickness and had a detrimental affect on the mechanical strength of the final joints. |
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