CORDIERITE POROUS CERAMIC HONEYCOMB ARTICLES WITH DELAYED MICROCRACK EVOLUTION

摘要

A porous ceramic honeycomb article includes a primary cordierite phase and an intercrystalline glass phase. In an as-fired condition, the porous ceramic honeycomb article exhibits microcrack parameter Nb3=0.06 and an as-fired E500 °C/E25 °C Ratio=0.99. The article exhibits a coated microcrack parameter Nb3=0.14 and a coated E500 °C/E25 °C Ratio=1.06 after the porous ceramic honeycomb article has been washcoated and calcined at a temperature of 500 °C. After the article is exposed to a thermal treatment at a temperature = 800 °C following washcoating and calcining, at least a first portion of the porous ceramic honeycomb article has a first treated microcrack parameter Nb3=0.18, and a first treated mean coefficient of thermal expansion of not more than 12x10-7/ °C over a temperature range of 25 °C to 800 °C. Methods of forming the porous ceramic honeycomb article are also disclosed.