Method for rapid stiffening of extrudates

Details Method for rapid stiffening of extrudates Method for rapid stiffening of extrudates

1997-10-17

1999-10-12

Wyszomierski, George

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 36, 419 67, 264630, 264634, 264638, B22F 102, B22F 320

Patent

active

059665823

ABSTRACT:
A method for extruding a stiffer powder mixture at lower extrusion pressure involves providing an aqueous mixture of inorganic powder that can be metal, ceramic, glass, glass ceramic, molecular sieve, and/or carbon, fatty acid the main chain of which has at least 12 carbon atoms, thermally gellable cellulose ether binder, and wax that can be paraffin and/or propylene glycol hydroxystearate, wherein the powder is coated with the fatty acid component. If clay is included in the mixture, it is provided as either calcined or hydrous. The mixture is passed through an extruder and through an extrusion die to produce a green extrudate at an extrusion pressure that is equal to or lower than it would be absent the combination of the fatty acid, the cellulose ether binder, and the wax. The mixture in the extruder and the extrudate are stiffer than without this combination.

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patent: 5678165 (1997-10-01), Wu

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