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1. (WO2001032377) COLLOIDAL ISOPRESSING

Pub. No.:    WO/2001/032377    International Application No.:    PCT/US2000/029407
Publication Date: Fri May 11 01:59:59 CEST 2001 International Filing Date: Thu Oct 26 01:59:59 CEST 2000
IPC: B28B 3/00
B28B 7/46
B28B 17/02
C04B 35/111
C04B 35/486
C04B 35/565
C04B 35/584
Applicants: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
LANGE, Fredrick, F.
YU, Benjamin, C.
Inventors: LANGE, Fredrick, F.
YU, Benjamin, C.
Title: COLLOIDAL ISOPRESSING
Abstract:
Colloidal isopressing provides a rapid method to form an engineering shape from a powder slurry, previously filtered to remove strength degrading inclusions. A slurry composed of a weakly attractive particle network, produced with a short-range, repulsive interparticle par potential, is consolidated to make a body with a high particle density that is easily fluidized by vibration. The fluid-like body is injected into a flexible mold and subjected to a larger isostatic pressure to force particles into contact. This creates a strong, elastic body with the shape of the mold. Because the particles are forced into contact at a high pressure, the liquid remaining within the component can be removed by evaporation without shrinkage, avoiding fracture during rapid drying.