Abstract

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. A crystalline glass mixed with alumina particles was used as inner constraint layer. Sintering shrinkage in the x-y direction of the LTCC is related to the bending strength of the alumina particle and glass-ceramic layer used for an inner-constraint layer. The crystallization temperature about crystalline glass is important. In the self-constrained sintering LTCC, the soft point of crystalline glass should be above 870degC. Smaller alumina particles in the inner-constraint layer produced a substrate with a high bending strength.

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