POROUS CORDIERITE CERAMIC HONEYCOMB ARTICLE WITH IMPROVED STRENGTH AND METHOD OF MANUFACTURING SAME

摘要

A porous cordierite ceramic honeycomb article with increased mechanical strength and thermal shock resistance. The porous cordierite ceramic honeycomb article has MA < 2220, or MT > 2660 wherein MA = 3645 (IA) - 106 (CTE) + 19 (d90) + 17 (%porosity), MT = 4711 (IT) + 116 (CTE) - 26 (d90) - 28 (%porosity), and a CTE 9 x 10-7/°C in at least one direction. A method of manufacturing is also disclosed wherein the inorganic raw material mixture contains talc, an alumina-forming source, a silica-forming source, and 0 - 18 wt. % of a kaolin or calcined kaolin containing not more than 8 wt. % of a fine kaolin source having a median particle diameter of less than 7 µm, wherein the fired porous ceramic cordierite honeycomb article has a porosity < 54%. Alternatively, if greater than 8 wt. % of the fine kaolin source is used, then a slow ramp rate is utilized from 1200 C to 1300 C of not more than 20 C/hr.