Patent ID: 8016967

Claim:
A method for manufacturing a multilayer ceramic substrate, comprising the steps of: preparing a composite laminate that includes a green ceramic laminate and first and second shrinkage control layers disposed on opposite first and second main surfaces of the ceramic laminate, the green ceramic laminate including a plurality of ceramic green layers each containing a low-temperature firing ceramic material, the first and second shrinkage control layers containing a powder of an inorganic material that cannot be sintered under sintering conditions of the low-temperature firing ceramic material; firing the composite laminate under conditions such that the low-temperature firing ceramic material is sintered and chemically reacts with the inorganic material to form first and second reaction layers along an interface between the first shrinkage control layer and the ceramic green layers and an interface between the second shrinkage control layer and the ceramic green layers; removing the first and second shrinkage control layers from the fired composite laminate; wherein the step of removing includes a step of reducing a thickness of at least the second reaction layer such that a ratio of a thickness of the first reaction layer to the thickness of the second reaction layer is between 4:3 and 6:1; and the multilayer ceramic substrate produced after the method of manufacturing has been completed includes the first and second reaction layers remaining after the step of reducing.