| 摘要 |
A metal-ceramic composite (a vacuum switch unit 50) having a metal member 13 having a tubular portion 13b, and a cylindrical ceramic member 55. The metal-ceramic composite (the vacuum switch unit 50) has a structure in which an end face of the tubular portion 13b of the metal member 13 is butt joined via a joint metal layer 15 to an end face 55a of the cylindrical ceramic member 55 in an edge sealed manner. In order to provide a metal-ceramic composite having a high joint strength which is less likely to cause defects such as cuts or cracks at the joint, the joint metal layer 15 and the ceramic member 55 contact each other at an annular region of W (mm) in average width which extends circumferentially about the end face 55a of the ceramic member 55. Furthermore, W and D have respective values which satisfy D>=30 {circle over (1)}; and (1/60)xD<=W<=(D/30)+3.1 {circle over (2)} where D (mm) is an outer diameter of the ceramic member.
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