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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, an

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.

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A metal to ceramic sealed joint for use in a device adapted to withstand thermal cycling from about 20 to 1000 degrees C comprising a metal member having a generally cylindrical wall, the wall of said metal member having an inner and an outer surface, a ceramic member comprised of a beta alumina hav

A metal to ceramic sealed joint for use in a device adapted to withstand thermal cycling from about 20 to 1000 degrees C comprising a metal member having a generally cylindrical wall, the wall of said metal member having an inner and an outer surface, a ceramic member comprised of a beta alumina having a hollow, cylindrical wall and an end portion, the wall of said ceramic member having an inner and an outer surface, and an active metal braze forming a joint to seal said wall of said metal member to said wall of said ceramic member, said joint positioned remote from said end portion of said ceramic member.