Back to results
US 6,235,665 B1Granted
Porous ceramic articles
AssigneePorvair PLC
InventorsGary R. Pickrell, Kenneth R. Butcher
Life of this patent
Estimating the term…
Abstract
An improved porous ceramic article and a method for forming such porous ceramic article. A mixture of ceramic particles and pliable organic hollow spheres is prepared in a liquid, typically as a suspension. The article is formed by pressing, slip casting, extruding or injection molding the mixture. The article is dried to remove the liquid, and then is fired so that the ceramic particles are bonded such as by sintering, and the organic spheres are burned off, resulting in a strong porous ceramic article having uniformly spaced interconnected voids.
Claims6
A porous ceramic article comprising:
- a ceramic article having a plurality of substantially spherical shaped voids therein;
- said voids being substantially uniformly dispersed throughout said article;
- substantially each of said voids intersecting with at least one adjacent void forming a substantially circular window at each intersection;
- said voids affecting a theoretical density of said article:
- when said article has theoretical density in the range from 5% to 30%, the breaking strength of the article is in the range from 700 psi to 4500 psi;
- the ceramic constituents of said article comprise zirconia, alumina, carbides of silicon, nitrides of silicon, oxides of silicon, mullite, or cordierite, or mixtures thereof.
3 more elements
Dependencies are inferred from the claim text.