Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Powder shape or size characteristics
Patent
1987-04-03
1988-07-26
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Powder shape or size characteristics
136239, 252 623T, 264 6, 264 10, 264157, 75228, 419 28, 419 33, 419 62, 419 66, B22F 324
Patent
active
047599057
ABSTRACT:
Apparatus is provided for the production of ultrafine powder. The powder is produced by spark erosion within an electric discharge cell. The starting material for production of the powder is a body in chunk form of the material to be pulverized. The material is contained in an electric discharge cell having a fine mesh screen bottom. The cell and its contents are immersed in a dielectric fluid such as water, liquified gas or an organic base liquid. The cell and its contents are vibrated to cause the chunks to separate repeatedly and momentarily. A sparking voltage is impressed repeatedly through the body to develop sparks between confronting portions of separated chunk surfaces. Small particles produced as a result of the sparking fall through the screen of the cell and are collected as product.
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patent: 3898080 (1975-06-01), Penn
patent: 3899359 (1975-08-01), Starchurski
patent: 4061505 (1977-12-01), Hamysl
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Berkowitz Ami E.
Walter John L.
Davis Jr. James C.
General Electric Company
Lechert Jr. Stephen J.
Rochford Paul E.
Webb II Paul R.
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