| 摘要 |
<p>A ceramic comprising predominately a cordierite-type phase approximating the stoichiometry Mg2Al4Si5O18 and having a coefficient of thermal expansion (25-800 °C) of greater than 4x10-7/°C and less than 13 x10-7/°C and a permeability and a pore size distribution which satisfy the relation 2.108 (permeability) + 18.511(total pore volume) +0.1863 (percentage of total pore volume comprised of pores between 4 and 40 micrometers) > 24.6. The ceramic is suitable in the fabrication of cellular, wall-flow, diesel particulate filters having a pressure drop in kPa that at an artificial carbon soot loading of 5 grams/liter and a flow rate of 26 scfm is less than 8.9 - 0.035 (number of cells per square inch) + 300 (cell wall thickness in inches), a bulk filter density of at least 0.60 g/cm3 and a volumetric heat capacity of at least 0.67 J cm-3 K-1 as measured at 500 °C.</p> |
