| 摘要 |
A DC switching apparatus is provided to prevent hydrogen and insulating gas as filling material from leaking by increasing brazing intensity of a ceramic and a metal case. A DC switching apparatus seals an arc extinguishing unit filled with a gas by brazing a metal case(12) and a ceramic(13). The ceramic is formed by adding manganese oxide as a sub component to aluminum oxide as a main component. Manganese of a metallizing layer formed on the ceramic and the manganese oxide are coupled in a loop structure in a heat-treatment process at a high temperature. The manganese oxide of less than 10% of total components is added.
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