Effect of plasticizer content on the rheological behavior of LTCC casting slurry under large amplitude oscillating shear

Abstract The casting slurry determines the quality of the low-temperature co-fired ceramic (LTCC) green tapes. In the present investigation, large amplitude oscillatory shear (LAOS) is first exploited to characterize the rheological properties of casting slurry. Three kinds of casting slurries with different plasticizer contents were cast into green tapes and studied. Furthermore, comprehensive performance tests were carried out on the obtained green tapes, which showed matching nonlinear rheological properties with those of casting slurries, as obtained by LAOS tests. It revealed that the addition of an appropriate amount of plasticizer (plastic/binder = 0.5) can significantly improve the structural uniformity of the slurry. The green tapes at this content also had high tensile strength and excellent yield elongation. This study combines the internal microstructure of the casting slurry and the external comprehensive performance of green tapes according to LAOS tests. The optimal plasticizer content can be quickly and accurately obtained from the rheological theory.