Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1974-06-03
1976-06-01
Padgett, Benjamin R.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
291821, 291822, 75214, 75221, 75225, B22F 300, B22F 100, B22F 102, B22F 104
Patent
active
039605540
ABSTRACT:
A powdered metallurgical procedure for forming chromium copper contacts used in vacuum interrupters, wherein by adding a small amount of copper powder to the difficult-to-press chromium powder, superior pressed properties are attained and a resulting chromium compact having higher green strength is produced. By practicing the teaching of this invention, vacuum interrupter contacts can be pressed to complex shapes. It is desirable to have a vacuum interrupter contact having an approximately 50% chromium composition. The low compacting pressure necessary to produce a 40% to 60% chromium powder concentrations yields a compact having a very low green strength which cannot be ejected from a die without falling apart; by adding a small amount of copper powder to the chromium powder before pressing a compact having a much higher green strength, which can be readily handled, is obtained. Using the disclosed process a press to shape contact having a variable density can be attained. This process can be used to produce a desirable chromium compact having a high density on the peripheral areas which decreases to a lower density in the center contact area.
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Elchik W. A.
Padgett Benjamin R.
Walsh Donald P.
Westinghouse Electric Corporation
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