Method of making microcellular ceramic bodies
US5427721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Oct 29, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B38/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Porous monolithic ceramic bodies containing reticulated macropores are produced by: PA1 a) forming a mixture of ceramic material particles, a first organic material and a second organic material, PA1 b) dissolving the first and second organic materials in each other to form a homogeneous solution, whereby the ceramic particles form a dispersion in the homogenous solution, PA1 c) forming the dispersion into a shape, PA1 d) cooling the shape at a rate sufficient to induce the non-equilibrium phase separation, thereby forming a first phase rich in the first organic material and a second phase rich in the second organic material, wherein at least a portion of the ceramic particles are segregated in the first phase, PA1 e) removing the second phase from the phase separated shape to form a porous shape, PA1 f) firing the porous shape to remove the any of the organic materials contained in the first phase and to sinter the segregated ceramic particles to form the porous monolithic ceramic body. The sintering step may be carried out to partial completion in order to obtain a monolith having an additional porosity in the submicron range whereby the monolith would have a bimodal pore size di…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.