Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold... – By direct application of vacuum or pneumatic pressure
Patent
1993-06-11
1995-06-27
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
By direct application of vacuum or pneumatic pressure
264 86, C04B 3328
Patent
active
054277221
ABSTRACT:
A method of making a hollow-shaped green ceramic article by pressure slip casting in a slip casting mold having a porous mold part with porosity channels opening at the surface of the mold cavity. A slip composition is formed having solid phase components with an average particle size distribution less than the cross-sectional dimension of mold porosity channels, and also having a flocculating agent to cause agglomeration of the solid phase particles into floccules larger than the porosity channel dimension.
The molding cavity is filled with the slip composition, and the same is then hydrostatically pressurized while withdrawing slip filtrate from the mold cavity via the mold porosity channels for a time sufficient to deposit to a desired thickness a layer of solids. Excess slip is then removed from the molding cavity to provide an exposed interior surface on the deposit layer. Air under pressure is then applied to the exposed interior surface of the deposit layer, preferably while also withdrawing slip filtrate via the mold porosity channels from the mold cavity surface-deposit layer interface. The slip casted green ceramic hollow article is removed from the mold only after sufficient water has been removed in situ from within the material of the green ceramic article to enable the same to be self-supporting.
REFERENCES:
patent: 4737326 (1988-04-01), Wirth et al.
patent: 4814127 (1989-03-01), Toyoda
patent: 4816182 (1989-03-01), Novich
patent: 4840763 (1989-06-01), Freitag
patent: 4882111 (1989-11-01), Murata
patent: 4884959 (1989-12-01), Ito et al.
patent: 4913640 (1990-04-01), Spieler et al.
patent: 4913868 (1990-04-01), Ito et al.
patent: 5087399 (1992-02-01), Neil et al.
patent: 5148852 (1992-09-01), Oishi
patent: 5156856 (1992-10-01), Iwasaki et al.
Fouts Richard E.
Johnston Robert P.
Brooks Cary W.
Derrington James
General Motors Corporation
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