Patent ID: 7148136

Claim:
A method of producing a ceramic multi-layer substrate comprising the steps of: preparing a composite laminate including an unfired ceramic laminate formed by laminating of a plurality of substrate ceramic green sheets, and a shrink-prevention ceramic green sheet arranged on at least one of the main surfaces of the unfired ceramic laminate, the shrink-prevention ceramic green sheet having a sintering temperature that is greater than the firing temperature of the unfired ceramic laminate; firing the composite laminate at a temperature at which the unfired ceramic laminate is fired and which is less than the sintering temperature of the shrink-prevention ceramic green sheet; and removing the shrink-prevention ceramic green sheet from the fired composite laminate; wherein the step of removing the shrink-prevention ceramic green sheet includes: a first removing step of spraying a liquid material and compressed gas against the shrink-prevention ceramic green sheet on the main surface of the composite laminate subjected to the firing step; and a second removing step of spraying ceramic powder, a liquid material, and compressed gas against the main surface of the ceramic multilayer after the first removing step.