METHOD FOR MAKING POROUS BOTTON-LAYER DIELECTRIC COMPOSITE STRUCTURE

摘要

The blister formation inhibiting method comprises the steps of applying to a substrate, a layer of finely divided particles of dielectric solids and glass dispersed in organic medium. A second layer of finely divided particles of glass dispersed in organic medium is then applied to the first layer. The laeyrs are fired to effect volatilization of the organic medium, liquid phase sintering of the glass components and densification of both layers. The particle size of the glass and the ratio of glass to dielectric solids in both layers is adjusted so that when the layers are fired, the first layer is porous and the second layer is non-porous, as measured by an ink absorption test.