DISPERSION-TOUGHENED CORDIERITE FOR FILTER AND SUBSTRATE APPLICATIONS

摘要

A porous ceramic substrate includes a first phase of microcracked cordierite ceramic material and a second phase of non-cordierite metal oxide particles dispersed in the cordierite ceramic, wherein at least a portion of the interface between the first and second phases is wetted by glass and the particles of the second phase have a size in the range of from about 0.1 to about 10 µm. A method for toughening a porous microcracked cordierite ceramic includes the steps of providing a cordierite batch composition; adding to the cordierite batch composition at least one non-cordierite forming metal oxide or metal oxide precursor; mixing the batch composition with a pore former, binder, and water into a paste; shaping the paste into a green body; firing the green body; and annealing the fired green body at a temperature below the firing temperature to form a toughened cordierite ceramic honeycomb having a second phase of crystallized non-cordierite particles dispersed within the cordierite ceramic, wherein at least a portion of the interface between the first and second phases is wetted by glass.