Cordierite honeycomb article and method of manufacture
US7887897B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2008 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Dec 3, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24157
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed are ceramic honeycomb articles which are composed predominately of a crystalline phase cordierite composition. The porous cordierite ceramic honeycomb articles has a plurality of cell channels and intersecting porous walls and possess a microstructure characterized by a pore size distribution wherein greater than or equal to 75% of the pore size distribution of the porosity of the porous walls, by volume, have a pore diameter (dv) wherein dv<10.0 μm and less than or equal to 35% of the pore size distribution have dv≦4.0 μm. Additionally, the pore diameter dv90≦14.0 μm, and CTE≦12.0×10−7/° C. from 25° C. to 800° C. The articles exhibits high filtration efficiency coupled with low pressure drop across the filter. Additionally, high porosity articles having porosity greater than or equal to 40% and low surface roughness of Ra<4.0 μm are described. Additionally, a method for manufacturing the ceramic honeycomb articles wherein fine talc, fine silica-forming source and a fine pore former are disclose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.