CERAMIC HOT-GAS FILTER

摘要

A ceramic hot gas filter, comprising: a porous elongated filter support, said support having an outer surface, an opening at one end into a hollow interior defined in part by an inner surface, a closed end opposite said open end, and an external flange integral with said open end, said support being formed of a plurality of layers of oxide ceramic yarn, each layer being arranged in a crisscrossing relationship with neighboring layers to form a plurality of quadrilateral- shaped openings, said yarn being coated with a first oxide ceramic material, said first oxide ceramic material providing, upon heat treatment, a porous refractory oxide support matrix; and a porous membrane layer contacting the outer surface or inner surface of said support, said membrane layer being less porous than said support and comprising (1) at least one circularly wound continuous filament oxide ceramic yarn, adjacent windings of said ceramic yarn defining a gap therebetween, said yarn being coated with a second oxide ceramic material, and (2) at least one ceramic filler material disposed in said membrane surface and substantially uniformly distributed therein.