Cement to make thermal shock resistant ceramic honeycomb structures and method to make them
AssigneeDow Global Technologies LLC
InventorsAleksander J. Pyzik, Nicholas M. Shinkel, Arthur R. Prunier, Jr., Janet M. Goss, Kwanho Yang
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Abstract
An improved ceramic honeycomb structure is comprised of at least two separate smaller ceramic honeycombs that have been adhered together by a cement layer comprised of a cement layer has at least two regions of differing porosity or cement layer where the ratio of toughness/Young's modulus is at least about 0.1 MPa·m1/2/GPa.
Claims14
A ceramic honeycomb structure comprised of at least two separate smaller ceramic honeycombs that have been adhered together by a cement layer comprised of fibers in which the cement layer has at least two regions of differing porosity, wherein the cement layer has a region of lower porosity dispersed within a second continuous matrix of higher porosity, wherein the region of lower porosity has a porosity of at most about 65% and the region of higher porosity has a porosity of at least about 70% and the lower porosity regions have an average size of at least about 300 micrometers.
Dependencies are inferred from the claim text.