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The effects of an inner constraint layer and alumina particles on the microstructure, strength, and shrinkage of the laminated low‐temperature cofired ceramic (LTCC) green sheet were investigated. Alumina particles of several sizes were used in the inner‐constraint layer in order to strengthen the LTCC substrate. Smaller alumina particles in the inner‐constraint layer produced a substrate with a high bending strength. Sintering shrinkage in the x – y direction of the LTCC is related to the bending strength of the debinded alumina particle layer used for an inner‐constraint layer. A larger pore size in the inner‐constraint layer was found to increase the distance of the glass penetration from the glass–alumina layer into the inner‐constraint layer. The total thickness of the constraint layer changes the shrinkage in the x – y direction and the bending strength.
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Takada et al. (2007) studied this question.
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