Method of forming and shaping plasticized mixtures and the green bodies made therefrom
US6372033B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Feb 11, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00129
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Powder mixtures and a method of forming and shaping the mixtures. The method involves compounding the components of powder materials, binder, solvent for the binder, surfactant, and non-solvent with respect to at least the binder, the solvent, and the powder materials. The non-solvent is lower in viscosity than the binder combined with the solvent. The solvent is present in an amount that is less than the amount that would be present otherwise. The components are mixed and plasticized, and shaped to form a green body. The choice of components results in improved wet green strength in the green body. The method is especially useful for extrusion processing of aqueous binder systems such as water and cellulose ethers and hydrophobic non-solvents, to form structures such as honeycombs. In the body, the ratio, upon subsequent firing, of the isostatic strength to the A-axis strength is at least about 20% higher than in bodies made without the mixture composition of the invention. A honeycomb body having a ratio of the isostatic strength to the A-axis strength of at least about 0.33 upon firing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.