Patent ID: 6455124
Filing Date: 2002-09-24
Classification: B01J,B28B,C04B,Y10T

Abstract:
A method for making a honeycomb structure comprising a channeled core section formed of a plurality of criss-crossing web segments and a smooth skin enclosing the core section that is free of circumferential stress cracks, wherein:(i) the core section and skin are formed by the concurrent extrusion of the web segments and a skin layer through a honeycomb extrusion die, the web segments and skin layer being formed from a ceramic batch material comprising high-aspect-ratio ceramic particles; (ii) the skin layer is extruded from the die at a slower speed than the web segments; and (iii) the ceramic particles in the skin layer and in the web segments are preferentially aligned with one another in the direction of extrusion, with the particles in the skin exhibiting substantially the same degree of alignment with one another other as exhibited by the ceramic particles in the web segments.