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780 |
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Wednesday, June 20, 2007, Brüssel 8:00 AM Fügen von Glas, Keramik und Metall Joining of glass, ceramics, metals |
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Development of metal-ceramic brazed joints for high temperature applications: example of SiC-Inconel joints |
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Thierry Baffie* / CEA-LITEN Grenoble, FRANCE Thierry BAFFIE / CEA/DTH, France Andrzej ZIOMBRA/ RWTH/IKKM, Germany Rudolf SCHICKTANZ/ Burgmann Industries, Germany |
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For many applications, sintered silicon carbide SiC, used in high temperature and corrosive environments, has to be brazed to a metal. Nowadays, there is still no tight solution for SiC/metal joints working higher than 400°C; this is mainly explained by chemical (high reactivity) and thermomechanical (high thermal expansion mismatch) incompatibilities between ceramics and metals. These two key points were addressed through the use of a low-active filler metal and interlayer materials. Numerical simulation was employed to optimise the design of the joints and the shape of the parts and thus, reduce stresses on SiC. SiC/metal brazed prototypes of industrial parts were fabricated and tested up to 400°C and failure. |