Honeycomb structure comprising a cement skin composition with crystalline inorganic fibrous material

摘要

Disclosed is a honeycomb support structure comprising a honeycomb body and an outer layer or skin formed of a cement that includes an inorganic filler material having a first coefficient of thermal expansion from 25° C. to 600° C. and a crystalline inorganic fibrous material having a second coefficient of thermal expansion from 25° C. to 600° C.

主权项

1. A honeycomb structure comprising:
a honeycomb body including cells extending axially between first and second opposing end faces of the honeycomb body, the cells comprising intersecting porous walls; a cement mixture deposited over a periphery of the honeycomb body, the cement mixture comprising:
an inorganic filler material having a first coefficient of thermal expansion from 25° C. to 600° C.; anda crystalline inorganic fibrous material having a second coefficient of thermal expansion from 25° C. to 600° C., wherein, the inorganic filler material comprises at least 10% of the total weight of the inorganic solid components of the cement mixture the first coefficient of thermal expansion is less than 50% of the second coefficient of thermal expansion, the crystalline inorganic fibrous material comprises 3% to 10% of the total weight of the inorganic solid components of the cement mixture, wherein the crystalline inorganic fibrous material has an average diameter of from 2 to 10 microns and an average length of from 10 to 50 microns; the crystalline inorganic fibrous material comprises 5% to 15% of the total weight of the inorganic solid components of the cement mixture, wherein the crystalline inorganic fibrous material has an average diameter of from 10 to 20 microns and an average length of from 50 to 100 microns; or the crystalline inorganic fibrous material comprises 10% to 20% of the total weight of the inorganic solid components of the cement mixture, wherein the crystalline inorganic fibrous material has an average diameter of from 20 to 60 microns and an average length of from 100 to 300 microns.