Metal to ceramic sealed joint

Details Metal to ceramic sealed joint Metal to ceramic sealed joint

C - Chemistry, Metallurgy

04

B

C04B 37/02 (2006.01) H01G 9/00 (2006.01) H01M 2/08 (2006.01)

Patent

CA 2017256

A metal to ceramic sealed joint which can withstand wide variations in temperature and maintain a good seal is provided for use in a device adapted to withstand thermal cycling from about 20 to about 1000 degrees C. The sealed joint includes a metal member, a ceramic member having an end portion, and an active metal braze forming a joint to seal the metal member to the ceramic member. The joint is positioned remote from the end portion of the ceramic member to avoid stresses at the ends or edges of the ceramic member. The sealed joint is particularly suited for use to form sealed metal to ceramic joints in a thermoelectric generator such as a sodium heat engine where a solid ceramic electrolyte is joined to metal parts in the system.

Joint scellé métal-céramique, qui peut supporter de grandes variations de température et conserver une bonne étanchéité, pour utilisation dans un dispositif adapté pour résister à un cycle thermique approximatif de 20 à 1000 °C. Le joint scellé est constitué d'un élément métallique, d'un élément céramique avec embout et d'une brasure à métal actif pour réunir l'élément métallique à l'élément céramique. Le raccordement se fait à distance de l'embout de l'élément céramique pour ne pas exercer de contraintes aux extrémités ou aux rives de l'élément céramique. Le joint scellé convient spécialement pour former des joints scellés métal-céramique dans une génératrice thermoélectrique tel un moteur thermique au sodium où une électrode pleine en céramique est raccordée aux pièces métalliques dans le système.

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