| 摘要 |
PROBLEM TO BE SOLVED: To provide a vacuum bulb having a contact point that has superior features in large-current breaking characteristics and re-ignition characteristics. SOLUTION: To a Cu component and a Cr component, consisting either of a mixture of a Cu powder and a Cr powder, or a molded body of a Cu powder and a Cr powder, or a Cu-Cr alloy, external force of at least 1.5 ton/cm2 is applied, and a Cu-Cr material is obtained. By subjecting this Cu-Cr material to heat treatment at 1,120 deg.C to 1,350 deg.C, a contact point is produced, which is used as the contact point of a vacuum bulb. In this way, a vacuum valve which is superior in large-current breaking characteristics and re-ignition characteristics can be realized.
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