| abstract |
The present invention is directed at sintered ceramic articles exhibiting a crystalline phase assemblage comprising, by weight, of 65-95 % cordierite and 5-35 % of a secondary phase selected from the group consisting of mullite, magnesium-aluminate spinel, and sapphirine and having a bulk analytical composition consisting esentially of about, by weight, 32-51 % SiO2, 35-49 % Al2O3, 7-16% MgO. Furthermore, the ceramic articles exhibit an effective strength of greater than about 3000, a CTE of less than about 15x10-7/°C, over the temperature range of 25 °C to 1000 °C, and a total intrusion porosity, as measured by a Hg intrusion method, of at least 20 %. This invention also relates to a method for producing a sintered ceramic article having the aforementioned cordierite and secondary minor phase mixture. |