Patent ID: 7935265

Claim:
A method for producing a ceramic substrate material having at least one layer comprising a first layer, the first layer comprising at least one first component made of either a crystalline ceramic material or a glass material or both, as a matrix and a second component made of a further crystalline ceramic material wherein the further crystalline ceramic material comprising crystals, or crystal agglomerates or both, which is provided in the matrix, comprising: etching in such a manner that mantle areas of either crystals or crystal agglomerates or both, of the second component are etched selectively in the first layer wherein said etching is performed in a predetermined area of the first layer or up to a predetermined depth of the first layer or in the predetermined area of the first layer and up to the predetermined depth of the first layer, using a corresponding mask; and, generating a cavity structure in the first layer only in the predetermined area or up to the predetermined depth of the first layer or in the predetermined area and up to the predetermined depth of the first layer.