| 摘要 |
An extrudable mixture is provided for producing a highly porous substrate wherein fibers, such as organic, inorganic, glass, ceramic or metal fibers, are mixed into a mass that when extruded and cured forms a highly porous substrate. Depending on the particular mixture the present invention enables substrate porosities of about 60% to 90%. The extrudable mixture may use a wide variety of fibers and additives and is adaptable to a wide variety of operating environments. Fibers, which have an aspect ratio greater than 1, are mixed with binders, pore-formers, extrusion aids and fluid to form a homogeneous mass which is extruded into a green substrate. The more volatile material is removed from the green substrate allowing the fibers to interconnect. As curing continues, fiber to fiber bonds form to produce a structure having a substantially open pore network. The resulting porous substrate forms a filter, catalyst host or catalytic converter. |
