Vacuum circuit interrupter contacts containing chromium...

Details Vacuum circuit interrupter contacts containing chromium... Vacuum circuit interrupter contacts containing chromium...

H - Electricity

01

H

75/160, 306/216,

H01H 33/66 (2006.01) B22F 1/00 (2006.01) C22C 1/04 (2006.01) H01H 1/02 (2006.01)

Patent

CA 1333014

A powdered metallurgical procedure for forming chromium copper contacts used in vacuum circuit interrupt- ers, 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°C to 1500°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° to 1400°C; or (ii) be subjected to hot isostatic pressure of 10,000 to 30,000 psig. at between 700°C to 1080°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°C to 900°C, to form the contacts.

587840

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