Vacuum switch contact materials and the manufacturing methods

Details Vacuum switch contact materials and the manufacturing methods Vacuum switch contact materials and the manufacturing methods

1990-01-08

1990-11-20

Morris, Theodore

Stock material or miscellaneous articles

All metal or with adjacent metals

Laterally noncoextensive components

75232, H01H 3366, C22C 3200

Patent

active

049718665

ABSTRACT:
In manufacturing contact materials which satisfy all the criteria required for use in vacuum switches as to chopping current, circuit breaking performance, withstanding voltage, welding separation force and wear, Cu powder and Ta.sub.2 O.sub.5 powder are mixed, and compressed while heating below the melting point of Cu in a nonoxidizing atmosphere. Alternatively a green compact is first manufactured from Ta.sub.2 O.sub.5 powder or a mixture of Ta.sub.2 O.sub.5 and Cu powder, and molten Cu is made to infiltrate into the compact. Preparing a green compact from a mixture of Cu powder and Ta.sub.2 O.sub.5 powder, it may be sintered at a temperature below the melting point of Cu, re-pressed, and resintered at 400.degree.-900.degree. C. in a nonoxidizing atmosphere.

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