Honeycomb structure comprising a multilayer cement skin

摘要

Disclosed is a ceramic honeycomb structure comprising a honeycomb body and a multilayered outer layer formed of a thick core layer applied and rapidly dried and a thin clad layer dried more gently to form a crack free dual skin layer. The core layer may have properties that are closer to those of the ceramic honeycomb body in service than the clad layer that may provide a tough outer shell to withstand handling and assembly.

主权项

1. A honeycomb structure, comprising:
a honeycomb body including a plurality of cells extending axially between first and second opposing end faces of the honeycomb body, the cells comprising intersecting porous walls; a first cement mixture layer disposed over a periphery of the honeycomb body; and a second cement mixture layer disposed over the first cement mixture layer, wherein the first cement mixture is a calcined cement mixture or a cold set cement mixture, and the second cement mixture is a calcined cement mixture or a cold set cement mixture, and wherein
the first cement mixture layer comprises a first porosity, a first modulus of rupture, and a first modulus of elasticity, andthe second cement mixture layer comprises a second porosity less than the first porosity, a second modulus of rupture greater than the first modulus of rupture, and a second modulus of elasticity greater than the first modulus of elasticity.