Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1998-09-01
2000-08-22
Friedhofer, Michael
Electricity: circuit makers and breakers
Electric switch details
Contact
218130, 218132, H01K 102, H01H 3366
Patent
active
061075825
ABSTRACT:
A vacuum valve which has a contact material having a constituent of high electrical conductivity such as Cu and an anti-arcing constituent including Cr in which particles whose particle size is in the range 0.1.about.150 .mu.m represent at least 90 volume %, and a ratio defined by the formula (.alpha..sub.900 -.alpha..sub.50).times.100/(.alpha..sub.900) for this contact material has a value of 8-12% and is the coefficient of thermal expansion of the contact material .alpha..sub.50 is the coefficient of thermal expansion of the contact material at 50.degree. C. The formation of channels generated at the interfaces of the Cr particles and the Cu matrix after undergoing the brazing step is suppressed, enabling the static withstand-voltage, contact resistance, and the breaking performance characteristics of the vacuum valve to be stabilized.
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Homma Mitsutaka
Kusano Takashi
Okutomi Tsutomu
Seki Tsuneyo
Somei Hiromichi
Friedhofer Michael
Kabushiki Kaisha Toshiba
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