Patent ID: 8372227

Claim:
A method for producing a multilayer ceramic substrate, comprising the steps of: preparing an unfired composite laminate body including an unfired multilayer ceramic substrate including a plurality of unfired base material layers stacked on each other, the unfired base material layers each containing as a main constituent a low-temperature sintering ceramic material including a glass material, and including first and second constraining layers containing as a main constituent a sintering-resistant ceramic powder which is not substantially sintered at a sintering temperature of the low-temperature sintering ceramic material, the first and second constraining layers respectively placed on first and second principal surfaces of the unfired multilayer ceramic substrate, which are opposed to each other; firing the unfired composite laminate body at the sintering temperature of the low-temperature sintering ceramic material, thereby obtaining a sintered multilayer ceramic substrate; and removing the first and second constraining layers to extract the sintered multilayer ceramic substrate; wherein a surface electrode is formed on at least one of the first and second principal surfaces of the unfired multilayer ceramic substrate, a total area of the surface electrode is smaller on a side of the first principal surface than on a side of the second principal surface, the plurality of base material layers provided for the unfired multilayer ceramic substrate includes at least a first base material layer which provides the first principal surface and a second base material layer which provides the second principal surface, and a glass material included in the second base material layer has a lower crystallization temperature than a glass material included in the first base material layer.