Patent ID: 6978901

Claim:
A ceramic multi-layer filter comprising: at least two layers, said at least two layers comprising the same or different ceramic materials, and a different particle size of ceramic particles in said at least two layers; one of said at least two layers is a support layer and at least one other layer of said at least two layers is present as a layer with ceramic material with a smaller particle size; particle surfaces of all ceramic particles in each of said at least two layers, during formation of said at least two layers, are wet entirely or partially with at least one material which wets the surfaces of the ceramic particles and has the same or approximately the same thermal coefficient of expansion as the ceramic particles, and the particle size, particle morphology and particle composition/crystal structure of the ceramic particles is not altered or only slightly altered with about ≦1% shrinkage of the ceramic multi-layer filter, and in which at least one of spot and surface connections are formed between the particles by said at least one material; the at least one material that wets the surfaces of the ceramic particles and forms the at least one of spot and surface connections between the ceramic particles is a borosilicate glass, an aluminum borosilicate glass or a lithium aluminum silicate glass; and pore volume and pore size between the ceramic particles is reduced by the material only slightly or only partially but not by more than 50%.