Pressure slip casting process for making hollow-shaped ceramics
US5427722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Jun 11, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/622
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 suffic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.