Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1988-01-25
1988-08-23
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200265, 75200, 75247, 419 32, H01H 3366
Patent
active
047662743
ABSTRACT:
A powdered metallurgical procedure for forming chromium copper contacts used in vacuum circuit interrupters, in which prealloyed powder formed by mixing to copper, chromium of between two to thirty-seven weight percent is rapidly solidified after melting at about 1100.degree. C. to 1500.degree. C. This powder may be blended with additional chromium of between 12 to 50 weight percent with a maximum of fifty-five weight percent of chromium in the final contact structure. This blended mixture may then be either (i) cold pressed at 100,000 psig. and vacuum sintered at 800.degree. to 1400.degree. C.; or (ii) be subjected to hot isostatic pressure of 10,000 to 30,000 psig. at between 700.degree. C. to 1080.degree. C.; or (iii) containing the blended copper-chromium powder and the additional chromium powder into an evacuated can and hot extruding the can between 400.degree. C. to 900.degree. C., to form the contacts.
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Hansen--Constitution of Binary Alloys, McGraw Hill Book Co.
Cherry Sidney J.
Gainer Robert E.
Iyer Natraj C.
Male Alan T.
Macon Robert S.
Niyogi B. K.
Westinghouse Electric Corp.
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