Patent ID: 7650694
Filing Date: 2010-01-26
Classification: H01L,H05K,Y10T

Abstract:
1. A method for forming multilayer substrate, comprising: forming a stack including a plurality of ceramic dielectric layers, the stack including upper and lower ceramic dielectric layers; providing a plurality of metallization traces on at least some of the ceramic dielectric layers in the stack; providing a plurality of vias in the ceramic dielectric layers, the vias formed to include electrically conductive material therein; forming a first metal layer on the upper ceramic dielectric layer; forming a second metal layer on the lower ceramic dielectric layer; wherein the first metal layer and the second metal layer are each formed to be at least 250 μm thick; wherein the stack including the plurality of ceramic dielectric layers and plurality of metallization traces are heated to densify the stack prior to the forming the first metal layer and prior to the forming the second metal layer; after the forming the first metal layer, forming a first additional ceramic dielectric layer on the first metal layer, the first metal layer positioned between the upper ceramic dielectric layer and the first additional ceramic dielectric layer; and after the forming the second metal layer, forming a second additional ceramic dielectric layer on the second metal layer, the second metal layer positioned between the lower ceramic dielectric layer and the second additional ceramic dielectric layer.